| /* |
| ** Copyright 2003-2010, VisualOn, Inc. |
| ** |
| ** Licensed under the Apache License, Version 2.0 (the "License"); |
| ** you may not use this file except in compliance with the License. |
| ** You may obtain a copy of the License at |
| ** |
| ** http://www.apache.org/licenses/LICENSE-2.0 |
| ** |
| ** Unless required by applicable law or agreed to in writing, software |
| ** distributed under the License is distributed on an "AS IS" BASIS, |
| ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| ** See the License for the specific language governing permissions and |
| ** limitations under the License. |
| */ |
| /******************************************************************************* |
| File: basicop2.c |
| |
| Content: Basic arithmetic operators. |
| |
| *******************************************************************************/ |
| |
| #include "typedef.h" |
| #include "basic_op.h" |
| |
| |
| /*___________________________________________________________________________ |
| | | |
| | Functions | |
| |___________________________________________________________________________| |
| */ |
| |
| /*___________________________________________________________________________ |
| | | |
| | Function Name : saturate | |
| | | |
| | Purpose : | |
| | | |
| | Limit the 32 bit input to the range of a 16 bit word. | |
| | | |
| | Inputs : | |
| | | |
| | L_var1 | |
| | 32 bit long signed integer (Word32) whose value falls in the | |
| | range : 0x8000 0000 <= L_var1 <= 0x7fff ffff. | |
| | | |
| | Outputs : | |
| | | |
| | none | |
| | | |
| | Return Value : | |
| | | |
| | var_out | |
| | 16 bit short signed integer (Word16) whose value falls in the | |
| | range : 0xffff 8000 <= var_out <= 0x0000 7fff. | |
| |___________________________________________________________________________| |
| */ |
| |
| #if (!SATRUATE_IS_INLINE) |
| Word16 saturate(Word32 L_var1) |
| { |
| Word16 var_out; |
| |
| if (L_var1 > 0X00007fffL) |
| { |
| var_out = MAX_16; |
| } |
| else if (L_var1 < (Word32) 0xffff8000L) |
| { |
| var_out = MIN_16; |
| } |
| else |
| { |
| var_out = extract_l(L_var1); |
| } |
| |
| return (var_out); |
| } |
| #endif |
| |
| /*___________________________________________________________________________ |
| | | |
| | Function Name : add | |
| | | |
| | Purpose : | |
| | | |
| | Performs the addition (var1+var2) with overflow control and saturation;| |
| | the 16 bit result is set at +32767 when overflow occurs or at -32768 | |
| | when underflow occurs. | |
| | | |
| | Complexity weight : 1 | |
| | | |
| | Inputs : | |
| | | |
| | var1 | |
| | 16 bit short signed integer (Word16) whose value falls in the | |
| | range : 0xffff 8000 <= var1 <= 0x0000 7fff. | |
| | | |
| | var2 | |
| | 16 bit short signed integer (Word16) whose value falls in the | |
| | range : 0xffff 8000 <= var1 <= 0x0000 7fff. | |
| | | |
| | Outputs : | |
| | | |
| | none | |
| | | |
| | Return Value : | |
| | | |
| | var_out | |
| | 16 bit short signed integer (Word16) whose value falls in the | |
| | range : 0xffff 8000 <= var_out <= 0x0000 7fff. | |
| |___________________________________________________________________________| |
| */ |
| |
| #if (!ADD_IS_INLINE) |
| Word16 add (Word16 var1, Word16 var2) |
| { |
| Word16 var_out; |
| Word32 L_sum; |
| |
| L_sum = (Word32)var1 + (Word32)var2; |
| var_out = saturate(L_sum); |
| |
| return (var_out); |
| } |
| #endif |
| |
| /*___________________________________________________________________________ |
| | | |
| | Function Name : sub | |
| | | |
| | Purpose : | |
| | | |
| | Performs the subtraction (var1+var2) with overflow control and satu- | |
| | ration; the 16 bit result is set at +32767 when overflow occurs or at | |
| | -32768 when underflow occurs. | |
| | | |
| | Complexity weight : 1 | |
| | | |
| | Inputs : | |
| | | |
| | var1 | |
| | 16 bit short signed integer (Word16) whose value falls in the | |
| | range : 0xffff 8000 <= var1 <= 0x0000 7fff. | |
| | | |
| | var2 | |
| | 16 bit short signed integer (Word16) whose value falls in the | |
| | range : 0xffff 8000 <= var1 <= 0x0000 7fff. | |
| | | |
| | Outputs : | |
| | | |
| | none | |
| | | |
| | Return Value : | |
| | | |
| | var_out | |
| | 16 bit short signed integer (Word16) whose value falls in the | |
| | range : 0xffff 8000 <= var_out <= 0x0000 7fff. | |
| |___________________________________________________________________________| |
| */ |
| #if (!SUB_IS_INLINE) |
| Word16 sub(Word16 var1, Word16 var2) |
| { |
| Word16 var_out; |
| Word32 L_diff; |
| |
| L_diff = (Word32) var1 - var2; |
| var_out = saturate(L_diff); |
| |
| return (var_out); |
| } |
| #endif |
| |
| /*___________________________________________________________________________ |
| | | |
| | Function Name : abs_s | |
| | | |
| | Purpose : | |
| | | |
| | Absolute value of var1; abs_s(-32768) = 32767. | |
| | | |
| | Complexity weight : 1 | |
| | | |
| | Inputs : | |
| | | |
| | var1 | |
| | 16 bit short signed integer (Word16) whose value falls in the | |
| | range : 0xffff 8000 <= var1 <= 0x0000 7fff. | |
| | | |
| | Outputs : | |
| | | |
| | none | |
| | | |
| | Return Value : | |
| | | |
| | var_out | |
| | 16 bit short signed integer (Word16) whose value falls in the | |
| | range : 0x0000 0000 <= var_out <= 0x0000 7fff. | |
| |___________________________________________________________________________| |
| */ |
| //Word16 abs_s (Word16 var1) |
| //{ |
| // Word16 var_out; |
| // |
| // if (var1 == MIN_16) |
| // { |
| // var_out = MAX_16; |
| // } |
| // else |
| // { |
| // if (var1 < 0) |
| // { |
| // var_out = (Word16)-var1; |
| // } |
| // else |
| // { |
| // var_out = var1; |
| // } |
| // } |
| // |
| // return (var_out); |
| //} |
| |
| |
| /*___________________________________________________________________________ |
| | | |
| | Function Name : shl | |
| | | |
| | Purpose : | |
| | | |
| | Arithmetically shift the 16 bit input var1 left var2 positions.Zero fill| |
| | the var2 LSB of the result. If var2 is negative, arithmetically shift | |
| | var1 right by -var2 with sign extension. Saturate the result in case of | |
| | underflows or overflows. | |
| | | |
| | Complexity weight : 1 | |
| | | |
| | Inputs : | |
| | | |
| | var1 | |
| | 16 bit short signed integer (Word16) whose value falls in the | |
| | range : 0xffff 8000 <= var1 <= 0x0000 7fff. | |
| | | |
| | var2 | |
| | 16 bit short signed integer (Word16) whose value falls in the | |
| | range : 0xffff 8000 <= var1 <= 0x0000 7fff. | |
| | | |
| | Outputs : | |
| | | |
| | none | |
| | | |
| | Return Value : | |
| | | |
| | var_out | |
| | 16 bit short signed integer (Word16) whose value falls in the | |
| | range : 0xffff 8000 <= var_out <= 0x0000 7fff. | |
| |___________________________________________________________________________| |
| */ |
| |
| #if (!SHL_IS_INLINE) |
| Word16 shl (Word16 var1, Word16 var2) |
| { |
| Word16 var_out; |
| Word32 result; |
| |
| if (var2 < 0) |
| { |
| if (var2 < -16) |
| var2 = -16; |
| var_out = shr (var1, (Word16)-var2); |
| } |
| else |
| { |
| result = (Word32) var1 *((Word32) 1 << var2); |
| |
| if ((var2 > 15 && var1 != 0) || (result != (Word32) ((Word16) result))) |
| { |
| //Overflow = 1; |
| var_out = (Word16)((var1 > 0) ? MAX_16 : MIN_16); |
| } |
| else |
| { |
| var_out = extract_l(result); |
| } |
| } |
| |
| return (var_out); |
| } |
| #endif |
| // end |
| |
| /*___________________________________________________________________________ |
| | | |
| | Function Name : shr | |
| | | |
| | Purpose : | |
| | | |
| | Arithmetically shift the 16 bit input var1 right var2 positions with | |
| | sign extension. If var2 is negative, arithmetically shift var1 left by | |
| | -var2 with sign extension. Saturate the result in case of underflows or | |
| | overflows. | |
| | | |
| | Complexity weight : 1 | |
| | | |
| | Inputs : | |
| | | |
| | var1 | |
| | 16 bit short signed integer (Word16) whose value falls in the | |
| | range : 0xffff 8000 <= var1 <= 0x0000 7fff. | |
| | | |
| | var2 | |
| | 16 bit short signed integer (Word16) whose value falls in the | |
| | range : 0xffff 8000 <= var1 <= 0x0000 7fff. | |
| | | |
| | Outputs : | |
| | | |
| | none | |
| | | |
| | Return Value : | |
| | | |
| | var_out | |
| | 16 bit short signed integer (Word16) whose value falls in the | |
| | range : 0xffff 8000 <= var_out <= 0x0000 7fff. | |
| |___________________________________________________________________________| |
| */ |
| |
| #if (!SHR_IS_INLINE) |
| Word16 shr (Word16 var1, Word16 var2) |
| { |
| Word16 var_out; |
| |
| if (var2 < 0) |
| { |
| if (var2 < -16) |
| var2 = -16; |
| var_out = shl (var1, (Word16)-var2); |
| } |
| else |
| { |
| if (var2 >= 15) |
| { |
| var_out = (Word16)((var1 < 0) ? -1 : 0); |
| } |
| else |
| { |
| if (var1 < 0) |
| { |
| var_out = (Word16)(~((~var1) >> var2)); |
| } |
| else |
| { |
| var_out = (Word16)(var1 >> var2); |
| } |
| } |
| } |
| |
| return (var_out); |
| } |
| #endif |
| |
| |
| /*___________________________________________________________________________ |
| | | |
| | Function Name : mult | |
| | | |
| | Purpose : | |
| | | |
| | Performs the multiplication of var1 by var2 and gives a 16 bit result | |
| | which is scaled i.e.: | |
| | mult(var1,var2) = extract_l(L_shr((var1 times var2),15)) and | |
| | mult(-32768,-32768) = 32767. | |
| | | |
| | Complexity weight : 1 | |
| | | |
| | Inputs : | |
| | | |
| | var1 | |
| | 16 bit short signed integer (Word16) whose value falls in the | |
| | range : 0xffff 8000 <= var1 <= 0x0000 7fff. | |
| | | |
| | var2 | |
| | 16 bit short signed integer (Word16) whose value falls in the | |
| | range : 0xffff 8000 <= var1 <= 0x0000 7fff. | |
| | | |
| | Outputs : | |
| | | |
| | none | |
| | | |
| | Return Value : | |
| | | |
| | var_out | |
| | 16 bit short signed integer (Word16) whose value falls in the | |
| | range : 0xffff 8000 <= var_out <= 0x0000 7fff. | |
| |___________________________________________________________________________| |
| */ |
| #if (!MULT_IS_INLINE) |
| Word16 mult (Word16 var1, Word16 var2) |
| { |
| Word16 var_out; |
| Word32 L_product; |
| |
| L_product = (Word32) var1 *(Word32) var2; |
| |
| L_product = (L_product & (Word32) 0xffff8000L) >> 15; |
| |
| if (L_product & (Word32) 0x00010000L) |
| L_product = L_product | (Word32) 0xffff0000L; |
| |
| var_out = saturate(L_product); |
| |
| return (var_out); |
| } |
| #endif |
| |
| /*___________________________________________________________________________ |
| | | |
| | Function Name : L_mult | |
| | | |
| | Purpose : | |
| | | |
| | L_mult is the 32 bit result of the multiplication of var1 times var2 | |
| | with one shift left i.e.: | |
| | L_mult(var1,var2) = L_shl((var1 times var2),1) and | |
| | L_mult(-32768,-32768) = 2147483647. | |
| | | |
| | Complexity weight : 1 | |
| | | |
| | Inputs : | |
| | | |
| | var1 | |
| | 16 bit short signed integer (Word16) whose value falls in the | |
| | range : 0xffff 8000 <= var1 <= 0x0000 7fff. | |
| | | |
| | var2 | |
| | 16 bit short signed integer (Word16) whose value falls in the | |
| | range : 0xffff 8000 <= var1 <= 0x0000 7fff. | |
| | | |
| | Outputs : | |
| | | |
| | none | |
| | | |
| | Return Value : | |
| | | |
| | L_var_out | |
| | 32 bit long signed integer (Word32) whose value falls in the | |
| | range : 0x8000 0000 <= L_var_out <= 0x7fff ffff. | |
| |___________________________________________________________________________| |
| */ |
| |
| #if (!L_MULT_IS_INLINE) |
| Word32 L_mult(Word16 var1, Word16 var2) |
| { |
| Word32 L_var_out; |
| |
| L_var_out = (Word32) var1 *(Word32) var2; |
| |
| if (L_var_out != (Word32) 0x40000000L) |
| { |
| L_var_out <<= 1; |
| } |
| else |
| { |
| L_var_out = MAX_32; |
| } |
| |
| return (L_var_out); |
| } |
| #endif |
| // end |
| |
| /*___________________________________________________________________________ |
| | | |
| | Function Name : negate | |
| | | |
| | Purpose : | |
| | | |
| | Negate var1 with saturation, saturate in the case where input is -32768:| |
| | negate(var1) = sub(0,var1). | |
| | | |
| | Complexity weight : 1 | |
| | | |
| | Inputs : | |
| | | |
| | var1 | |
| | 16 bit short signed integer (Word16) whose value falls in the | |
| | range : 0xffff 8000 <= var1 <= 0x0000 7fff. | |
| | | |
| | Outputs : | |
| | | |
| | none | |
| | | |
| | Return Value : | |
| | | |
| | var_out | |
| | 16 bit short signed integer (Word16) whose value falls in the | |
| | range : 0xffff 8000 <= var_out <= 0x0000 7fff. | |
| |___________________________________________________________________________| |
| */ |
| //Word16 negate (Word16 var1) |
| //{ |
| // Word16 var_out; |
| // |
| // var_out = (Word16)((var1 == MIN_16) ? MAX_16 : -var1); |
| // |
| // return (var_out); |
| //} |
| |
| |
| /*___________________________________________________________________________ |
| | | |
| | Function Name : extract_h | |
| | | |
| | Purpose : | |
| | | |
| | Return the 16 MSB of L_var1. | |
| | | |
| | Complexity weight : 1 | |
| | | |
| | Inputs : | |
| | | |
| | L_var1 | |
| | 32 bit long signed integer (Word32 ) whose value falls in the | |
| | range : 0x8000 0000 <= L_var1 <= 0x7fff ffff. | |
| | | |
| | Outputs : | |
| | | |
| | none | |
| | | |
| | Return Value : | |
| | | |
| | var_out | |
| | 16 bit short signed integer (Word16) whose value falls in the | |
| | range : 0xffff 8000 <= var_out <= 0x0000 7fff. | |
| |___________________________________________________________________________| |
| */ |
| #if (!EXTRACT_H_IS_INLINE) |
| Word16 extract_h (Word32 L_var1) |
| { |
| Word16 var_out; |
| |
| var_out = (Word16) (L_var1 >> 16); |
| |
| return (var_out); |
| } |
| #endif |
| |
| /*___________________________________________________________________________ |
| | | |
| | Function Name : extract_l | |
| | | |
| | Purpose : | |
| | | |
| | Return the 16 LSB of L_var1. | |
| | | |
| | Complexity weight : 1 | |
| | | |
| | Inputs : | |
| | | |
| | L_var1 | |
| | 32 bit long signed integer (Word32 ) whose value falls in the | |
| | range : 0x8000 0000 <= L_var1 <= 0x7fff ffff. | |
| | | |
| | Outputs : | |
| | | |
| | none | |
| | | |
| | Return Value : | |
| | | |
| | var_out | |
| | 16 bit short signed integer (Word16) whose value falls in the | |
| | range : 0xffff 8000 <= var_out <= 0x0000 7fff. | |
| |___________________________________________________________________________| |
| */ |
| #if (!EXTRACT_L_IS_INLINE) |
| Word16 extract_l(Word32 L_var1) |
| { |
| Word16 var_out; |
| |
| var_out = (Word16) L_var1; |
| |
| return (var_out); |
| } |
| #endif |
| |
| /*___________________________________________________________________________ |
| | | |
| | Function Name : round | |
| | | |
| | Purpose : | |
| | | |
| | Round the lower 16 bits of the 32 bit input number into the MS 16 bits | |
| | with saturation. Shift the resulting bits right by 16 and return the 16 | |
| | bit number: | |
| | round(L_var1) = extract_h(L_add(L_var1,32768)) | |
| | | |
| | Complexity weight : 1 | |
| | | |
| | Inputs : | |
| | | |
| | L_var1 | |
| | 32 bit long signed integer (Word32 ) whose value falls in the | |
| | range : 0x8000 0000 <= L_var1 <= 0x7fff ffff. | |
| | | |
| | Outputs : | |
| | | |
| | none | |
| | | |
| | Return Value : | |
| | | |
| | var_out | |
| | 16 bit short signed integer (Word16) whose value falls in the | |
| | range : 0xffff 8000 <= var_out <= 0x0000 7fff. | |
| |___________________________________________________________________________| |
| */ |
| |
| #if (!ROUND_IS_INLINE) |
| Word16 round16(Word32 L_var1) |
| { |
| Word16 var_out; |
| Word32 L_rounded; |
| |
| L_rounded = L_add (L_var1, (Word32) 0x00008000L); |
| var_out = extract_h (L_rounded); |
| |
| return (var_out); |
| } |
| #endif |
| // end |
| |
| /*___________________________________________________________________________ |
| | | |
| | Function Name : L_mac | |
| | | |
| | Purpose : | |
| | | |
| | Multiply var1 by var2 and shift the result left by 1. Add the 32 bit | |
| | result to L_var3 with saturation, return a 32 bit result: | |
| | L_mac(L_var3,var1,var2) = L_add(L_var3,L_mult(var1,var2)). | |
| | | |
| | Complexity weight : 1 | |
| | | |
| | Inputs : | |
| | | |
| | L_var3 32 bit long signed integer (Word32) whose value falls in the | |
| | range : 0x8000 0000 <= L_var3 <= 0x7fff ffff. | |
| | | |
| | var1 | |
| | 16 bit short signed integer (Word16) whose value falls in the | |
| | range : 0xffff 8000 <= var1 <= 0x0000 7fff. | |
| | | |
| | var2 | |
| | 16 bit short signed integer (Word16) whose value falls in the | |
| | range : 0xffff 8000 <= var1 <= 0x0000 7fff. | |
| | | |
| | Outputs : | |
| | | |
| | none | |
| | | |
| | Return Value : | |
| | | |
| | L_var_out | |
| | 32 bit long signed integer (Word32) whose value falls in the | |
| | range : 0x8000 0000 <= L_var_out <= 0x7fff ffff. | |
| |___________________________________________________________________________| |
| */ |
| #if (!L_MSU_IS_INLINE) |
| Word32 L_mac (Word32 L_var3, Word16 var1, Word16 var2) |
| { |
| Word32 L_var_out; |
| Word32 L_product; |
| |
| L_product = L_mult(var1, var2); |
| L_var_out = L_add (L_var3, L_product); |
| |
| return (L_var_out); |
| } |
| #endif |
| |
| /*___________________________________________________________________________ |
| | | |
| | Function Name : L_msu | |
| | | |
| | Purpose : | |
| | | |
| | Multiply var1 by var2 and shift the result left by 1. Subtract the 32 | |
| | bit result to L_var3 with saturation, return a 32 bit result: | |
| | L_msu(L_var3,var1,var2) = L_sub(L_var3,L_mult(var1,var2)). | |
| | | |
| | Complexity weight : 1 | |
| | | |
| | Inputs : | |
| | | |
| | L_var3 32 bit long signed integer (Word32) whose value falls in the | |
| | range : 0x8000 0000 <= L_var3 <= 0x7fff ffff. | |
| | | |
| | var1 | |
| | 16 bit short signed integer (Word16) whose value falls in the | |
| | range : 0xffff 8000 <= var1 <= 0x0000 7fff. | |
| | | |
| | var2 | |
| | 16 bit short signed integer (Word16) whose value falls in the | |
| | range : 0xffff 8000 <= var1 <= 0x0000 7fff. | |
| | | |
| | Outputs : | |
| | | |
| | none | |
| | | |
| | Return Value : | |
| | | |
| | L_var_out | |
| | 32 bit long signed integer (Word32) whose value falls in the | |
| | range : 0x8000 0000 <= L_var_out <= 0x7fff ffff. | |
| |___________________________________________________________________________| |
| */ |
| |
| #if (!L_MSU_IS_INLINE) |
| Word32 L_msu (Word32 L_var3, Word16 var1, Word16 var2) |
| { |
| Word32 L_var_out; |
| Word32 L_product; |
| |
| L_product = L_mult(var1, var2); |
| L_var_out = L_sub (L_var3, L_product); |
| |
| return (L_var_out); |
| } |
| #endif |
| |
| |
| /*___________________________________________________________________________ |
| | | |
| | Function Name : L_add | |
| | | |
| | Purpose : | |
| | | |
| | 32 bits addition of the two 32 bits variables (L_var1+L_var2) with | |
| | overflow control and saturation; the result is set at +2147483647 when | |
| | overflow occurs or at -2147483648 when underflow occurs. | |
| | | |
| | Complexity weight : 2 | |
| | | |
| | Inputs : | |
| | | |
| | L_var1 32 bit long signed integer (Word32) whose value falls in the | |
| | range : 0x8000 0000 <= L_var3 <= 0x7fff ffff. | |
| | | |
| | L_var2 32 bit long signed integer (Word32) whose value falls in the | |
| | range : 0x8000 0000 <= L_var3 <= 0x7fff ffff. | |
| | | |
| | Outputs : | |
| | | |
| | none | |
| | | |
| | Return Value : | |
| | | |
| | L_var_out | |
| | 32 bit long signed integer (Word32) whose value falls in the | |
| | range : 0x8000 0000 <= L_var_out <= 0x7fff ffff. | |
| |___________________________________________________________________________| |
| */ |
| #if (!L_ADD_IS_INLINE) |
| Word32 L_add (Word32 L_var1, Word32 L_var2) |
| { |
| Word32 L_var_out; |
| |
| L_var_out = L_var1 + L_var2; |
| |
| if (((L_var1 ^ L_var2) & MIN_32) == 0) |
| { |
| if ((L_var_out ^ L_var1) & MIN_32) |
| { |
| L_var_out = (L_var1 < 0) ? MIN_32 : MAX_32; |
| //Overflow = 1; |
| } |
| } |
| |
| return (L_var_out); |
| } |
| #endif |
| |
| /*___________________________________________________________________________ |
| | | |
| | Function Name : L_sub | |
| | | |
| | Purpose : | |
| | | |
| | 32 bits subtraction of the two 32 bits variables (L_var1-L_var2) with | |
| | overflow control and saturation; the result is set at +2147483647 when | |
| | overflow occurs or at -2147483648 when underflow occurs. | |
| | | |
| | Complexity weight : 2 | |
| | | |
| | Inputs : | |
| | | |
| | L_var1 32 bit long signed integer (Word32) whose value falls in the | |
| | range : 0x8000 0000 <= L_var3 <= 0x7fff ffff. | |
| | | |
| | L_var2 32 bit long signed integer (Word32) whose value falls in the | |
| | range : 0x8000 0000 <= L_var3 <= 0x7fff ffff. | |
| | | |
| | Outputs : | |
| | | |
| | none | |
| | | |
| | Return Value : | |
| | | |
| | L_var_out | |
| | 32 bit long signed integer (Word32) whose value falls in the | |
| | range : 0x8000 0000 <= L_var_out <= 0x7fff ffff. | |
| |___________________________________________________________________________| |
| */ |
| #if (!L_SUB_IS_INLINE) |
| Word32 L_sub(Word32 L_var1, Word32 L_var2) |
| { |
| Word32 L_var_out; |
| |
| L_var_out = L_var1 - L_var2; |
| |
| if (((L_var1 ^ L_var2) & MIN_32) != 0) |
| { |
| if ((L_var_out ^ L_var1) & MIN_32) |
| { |
| L_var_out = (L_var1 < 0L) ? MIN_32 : MAX_32; |
| //Overflow = 1; |
| } |
| } |
| |
| return (L_var_out); |
| } |
| #endif |
| |
| |
| /*___________________________________________________________________________ |
| | | |
| | Function Name : L_negate | |
| | | |
| | Purpose : | |
| | | |
| | Negate the 32 bit variable L_var1 with saturation; saturate in the case | |
| | where input is -2147483648 (0x8000 0000). | |
| | | |
| | Complexity weight : 2 | |
| | | |
| | Inputs : | |
| | | |
| | L_var1 32 bit long signed integer (Word32) whose value falls in the | |
| | range : 0x8000 0000 <= L_var3 <= 0x7fff ffff. | |
| | | |
| | Outputs : | |
| | | |
| | none | |
| | | |
| | Return Value : | |
| | | |
| | L_var_out | |
| | 32 bit long signed integer (Word32) whose value falls in the | |
| | range : 0x8000 0000 <= L_var_out <= 0x7fff ffff. | |
| |___________________________________________________________________________| |
| */ |
| //Word32 L_negate (Word32 L_var1) |
| //{ |
| // Word32 L_var_out; |
| // |
| // L_var_out = (L_var1 == MIN_32) ? MAX_32 : -L_var1; |
| // |
| // return (L_var_out); |
| //} |
| |
| |
| /*___________________________________________________________________________ |
| | | |
| | Function Name : mult_r | |
| | | |
| | Purpose : | |
| | | |
| | Same as mult with rounding, i.e.: | |
| | mult_r(var1,var2) = extract_l(L_shr(((var1 * var2) + 16384),15)) and | |
| | mult_r(-32768,-32768) = 32767. | |
| | | |
| | Complexity weight : 2 | |
| | | |
| | Inputs : | |
| | | |
| | var1 | |
| | 16 bit short signed integer (Word16) whose value falls in the | |
| | range : 0xffff 8000 <= var1 <= 0x0000 7fff. | |
| | | |
| | var2 | |
| | 16 bit short signed integer (Word16) whose value falls in the | |
| | range : 0xffff 8000 <= var1 <= 0x0000 7fff. | |
| | | |
| | Outputs : | |
| | | |
| | none | |
| | | |
| | Return Value : | |
| | | |
| | var_out | |
| | 16 bit short signed integer (Word16) whose value falls in the | |
| | range : 0xffff 8000 <= var_out <= 0x0000 7fff. | |
| |___________________________________________________________________________| |
| */ |
| #if (!MULT_R_IS_INLINE) |
| Word16 mult_r (Word16 var1, Word16 var2) |
| { |
| Word16 var_out; |
| Word32 L_product_arr; |
| |
| L_product_arr = (Word32) var1 *(Word32) var2; /* product */ |
| L_product_arr += (Word32) 0x00004000L; /* round */ |
| L_product_arr &= (Word32) 0xffff8000L; |
| L_product_arr >>= 15; /* shift */ |
| |
| if (L_product_arr & (Word32) 0x00010000L) /* sign extend when necessary */ |
| { |
| L_product_arr |= (Word32) 0xffff0000L; |
| } |
| var_out = saturate(L_product_arr); |
| |
| return (var_out); |
| } |
| #endif |
| |
| /*___________________________________________________________________________ |
| | | |
| | Function Name : L_shl | |
| | | |
| | Purpose : | |
| | | |
| | Arithmetically shift the 32 bit input L_var1 left var2 positions. Zero | |
| | fill the var2 LSB of the result. If var2 is negative, arithmetically | |
| | shift L_var1 right by -var2 with sign extension. Saturate the result in | |
| | case of underflows or overflows. | |
| | | |
| | Complexity weight : 2 | |
| | | |
| | Inputs : | |
| | | |
| | L_var1 32 bit long signed integer (Word32) whose value falls in the | |
| | range : 0x8000 0000 <= L_var3 <= 0x7fff ffff. | |
| | | |
| | var2 | |
| | 16 bit short signed integer (Word16) whose value falls in the | |
| | range : 0xffff 8000 <= var1 <= 0x0000 7fff. | |
| | | |
| | Outputs : | |
| | | |
| | none | |
| | | |
| | Return Value : | |
| | | |
| | L_var_out | |
| | 32 bit long signed integer (Word32) whose value falls in the | |
| | range : 0x8000 0000 <= L_var_out <= 0x7fff ffff. | |
| |___________________________________________________________________________| |
| */ |
| |
| #if (!L_SHL_IS_INLINE) |
| Word32 L_shl (Word32 L_var1, Word16 var2) |
| { |
| Word32 L_var_out = 0L; |
| |
| if (var2 <= 0) |
| { |
| L_var1 = L_shr(L_var1, (Word16)-var2); |
| } |
| else |
| { |
| for (; var2 > 0; var2--) |
| { |
| if (L_var1 > (Word32) 0X3fffffffL) |
| { |
| return MAX_32; |
| } |
| else |
| { |
| if (L_var1 < (Word32) 0xc0000000L) |
| { |
| return MIN_32; |
| } |
| } |
| L_var1 <<= 1; |
| } |
| } |
| return (L_var1); |
| } |
| #endif |
| |
| /*___________________________________________________________________________ |
| | | |
| | Function Name : L_shr | |
| | | |
| | Purpose : | |
| | | |
| | Arithmetically shift the 32 bit input L_var1 right var2 positions with | |
| | sign extension. If var2 is negative, arithmetically shift L_var1 left | |
| | by -var2 and zero fill the -var2 LSB of the result. Saturate the result | |
| | in case of underflows or overflows. | |
| | | |
| | Complexity weight : 2 | |
| | | |
| | Inputs : | |
| | | |
| | L_var1 32 bit long signed integer (Word32) whose value falls in the | |
| | range : 0x8000 0000 <= L_var3 <= 0x7fff ffff. | |
| | | |
| | var2 | |
| | 16 bit short signed integer (Word16) whose value falls in the | |
| | range : 0xffff 8000 <= var1 <= 0x0000 7fff. | |
| | | |
| | Outputs : | |
| | | |
| | none | |
| | | |
| | Return Value : | |
| | | |
| | L_var_out | |
| | 32 bit long signed integer (Word32) whose value falls in the | |
| | range : 0x8000 0000 <= L_var_out <= 0x7fff ffff. | |
| |___________________________________________________________________________| |
| */ |
| |
| #if (!L_SHR_IS_INLINE) |
| Word32 L_shr (Word32 L_var1, Word16 var2) |
| { |
| Word32 L_var_out; |
| |
| if (var2 < 0) |
| { |
| L_var_out = L_shl (L_var1, (Word16)-var2); |
| } |
| else |
| { |
| if (var2 >= 31) |
| { |
| L_var_out = (L_var1 < 0L) ? -1 : 0; |
| } |
| else |
| { |
| if (L_var1 < 0) |
| { |
| L_var_out = ~((~L_var1) >> var2); |
| } |
| else |
| { |
| L_var_out = L_var1 >> var2; |
| } |
| } |
| } |
| return (L_var_out); |
| } |
| #endif |
| |
| /*___________________________________________________________________________ |
| | | |
| | Function Name : shr_r | |
| | | |
| | Purpose : | |
| | | |
| | Same as shr(var1,var2) but with rounding. Saturate the result in case of| |
| | underflows or overflows : | |
| | - If var2 is greater than zero : | |
| | if (sub(shl(shr(var1,var2),1),shr(var1,sub(var2,1)))) | |
| | is equal to zero | |
| | then | |
| | shr_r(var1,var2) = shr(var1,var2) | |
| | else | |
| | shr_r(var1,var2) = add(shr(var1,var2),1) | |
| | - If var2 is less than or equal to zero : | |
| | shr_r(var1,var2) = shr(var1,var2). | |
| | | |
| | Complexity weight : 2 | |
| | | |
| | Inputs : | |
| | | |
| | var1 | |
| | 16 bit short signed integer (Word16) whose value falls in the | |
| | range : 0xffff 8000 <= var1 <= 0x0000 7fff. | |
| | | |
| | var2 | |
| | 16 bit short signed integer (Word16) whose value falls in the | |
| | range : 0xffff 8000 <= var1 <= 0x0000 7fff. | |
| | | |
| | Outputs : | |
| | | |
| | none | |
| | | |
| | Return Value : | |
| | | |
| | var_out | |
| | 16 bit short signed integer (Word16) whose value falls in the | |
| | range : 0xffff 8000 <= var_out <= 0x0000 7fff. | |
| |___________________________________________________________________________| |
| */ |
| #if (!SHR_R_IS_INLINE) |
| Word16 shr_r (Word16 var1, Word16 var2) |
| { |
| Word16 var_out; |
| |
| if (var2 > 15) |
| { |
| var_out = 0; |
| } |
| else |
| { |
| var_out = shr (var1, var2); |
| |
| if (var2 > 0) |
| { |
| if ((var1 & ((Word16) 1 << (var2 - 1))) != 0) |
| { |
| var_out++; |
| } |
| } |
| } |
| |
| return (var_out); |
| } |
| #endif |
| |
| /*___________________________________________________________________________ |
| | | |
| | Function Name : mac_r | |
| | | |
| | Purpose : | |
| | | |
| | Multiply var1 by var2 and shift the result left by 1. Add the 32 bit | |
| | result to L_var3 with saturation. Round the LS 16 bits of the result | |
| | into the MS 16 bits with saturation and shift the result right by 16. | |
| | Return a 16 bit result. | |
| | mac_r(L_var3,var1,var2) = round(L_mac(L_var3,var1,var2)) | |
| | | |
| | Complexity weight : 2 | |
| | | |
| | Inputs : | |
| | | |
| | L_var3 32 bit long signed integer (Word32) whose value falls in the | |
| | range : 0x8000 0000 <= L_var3 <= 0x7fff ffff. | |
| | | |
| | var1 | |
| | 16 bit short signed integer (Word16) whose value falls in the | |
| | range : 0xffff 8000 <= var1 <= 0x0000 7fff. | |
| | | |
| | var2 | |
| | 16 bit short signed integer (Word16) whose value falls in the | |
| | range : 0xffff 8000 <= var1 <= 0x0000 7fff. | |
| | | |
| | Outputs : | |
| | | |
| | none | |
| | | |
| | Return Value : | |
| | | |
| | var_out | |
| | 16 bit short signed integer (Word16) whose value falls in the | |
| | range : 0x0000 8000 <= L_var_out <= 0x0000 7fff. | |
| |___________________________________________________________________________| |
| */ |
| #if (!MAC_R_IS_INLINE) |
| Word16 mac_r (Word32 L_var3, Word16 var1, Word16 var2) |
| { |
| Word16 var_out; |
| |
| L_var3 = L_mac (L_var3, var1, var2); |
| L_var3 = L_add (L_var3, (Word32) 0x00008000L); |
| var_out = extract_h (L_var3); |
| |
| return (var_out); |
| } |
| #endif |
| |
| /*___________________________________________________________________________ |
| | | |
| | Function Name : msu_r | |
| | | |
| | Purpose : | |
| | | |
| | Multiply var1 by var2 and shift the result left by 1. Subtract the 32 | |
| | bit result to L_var3 with saturation. Round the LS 16 bits of the res- | |
| | ult into the MS 16 bits with saturation and shift the result right by | |
| | 16. Return a 16 bit result. | |
| | msu_r(L_var3,var1,var2) = round(L_msu(L_var3,var1,var2)) | |
| | | |
| | Complexity weight : 2 | |
| | | |
| | Inputs : | |
| | | |
| | L_var3 32 bit long signed integer (Word32) whose value falls in the | |
| | range : 0x8000 0000 <= L_var3 <= 0x7fff ffff. | |
| | | |
| | var1 | |
| | 16 bit short signed integer (Word16) whose value falls in the | |
| | range : 0xffff 8000 <= var1 <= 0x0000 7fff. | |
| | | |
| | var2 | |
| | 16 bit short signed integer (Word16) whose value falls in the | |
| | range : 0xffff 8000 <= var1 <= 0x0000 7fff. | |
| | | |
| | Outputs : | |
| | | |
| | none | |
| | | |
| | Return Value : | |
| | | |
| | var_out | |
| | 16 bit short signed integer (Word16) whose value falls in the | |
| | range : 0x0000 8000 <= L_var_out <= 0x0000 7fff. | |
| |___________________________________________________________________________| |
| */ |
| #if (!MSU_R_IS_INLINE) |
| Word16 msu_r (Word32 L_var3, Word16 var1, Word16 var2) |
| { |
| Word16 var_out; |
| |
| L_var3 = L_msu (L_var3, var1, var2); |
| L_var3 = L_add (L_var3, (Word32) 0x00008000L); |
| var_out = extract_h (L_var3); |
| |
| return (var_out); |
| } |
| #endif |
| |
| /*___________________________________________________________________________ |
| | | |
| | Function Name : L_deposit_h | |
| | | |
| | Purpose : | |
| | | |
| | Deposit the 16 bit var1 into the 16 MS bits of the 32 bit output. The | |
| | 16 LS bits of the output are zeroed. | |
| | | |
| | Complexity weight : 2 | |
| | | |
| | Inputs : | |
| | | |
| | var1 | |
| | 16 bit short signed integer (Word16) whose value falls in the | |
| | range : 0xffff 8000 <= var1 <= 0x0000 7fff. | |
| | | |
| | Outputs : | |
| | | |
| | none | |
| | | |
| | Return Value : | |
| | | |
| | L_var_out | |
| | 32 bit long signed integer (Word32) whose value falls in the | |
| | range : 0x8000 0000 <= var_out <= 0x7fff 0000. | |
| |___________________________________________________________________________| |
| */ |
| //Word32 L_deposit_h (Word16 var1) |
| //{ |
| // Word32 L_var_out; |
| // |
| // L_var_out = (Word32) var1 << 16; |
| // |
| // return (L_var_out); |
| //} |
| |
| |
| /*___________________________________________________________________________ |
| | | |
| | Function Name : L_deposit_l | |
| | | |
| | Purpose : | |
| | | |
| | Deposit the 16 bit var1 into the 16 LS bits of the 32 bit output. The | |
| | 16 MS bits of the output are sign extended. | |
| | | |
| | Complexity weight : 2 | |
| | | |
| | Inputs : | |
| | | |
| | var1 | |
| | 16 bit short signed integer (Word16) whose value falls in the | |
| | range : 0xffff 8000 <= var1 <= 0x0000 7fff. | |
| | | |
| | Outputs : | |
| | | |
| | none | |
| | | |
| | Return Value : | |
| | | |
| | L_var_out | |
| | 32 bit long signed integer (Word32) whose value falls in the | |
| | range : 0xFFFF 8000 <= var_out <= 0x0000 7fff. | |
| |___________________________________________________________________________| |
| */ |
| //Word32 L_deposit_l (Word16 var1) |
| //{ |
| // Word32 L_var_out; |
| // |
| // L_var_out = (Word32) var1; |
| // |
| // return (L_var_out); |
| //} |
| |
| |
| /*___________________________________________________________________________ |
| | | |
| | Function Name : L_shr_r | |
| | | |
| | Purpose : | |
| | | |
| | Same as L_shr(L_var1,var2) but with rounding. Saturate the result in | |
| | case of underflows or overflows : | |
| | - If var2 is greater than zero : | |
| | if (L_sub(L_shl(L_shr(L_var1,var2),1),L_shr(L_var1,sub(var2,1))))| |
| | is equal to zero | |
| | then | |
| | L_shr_r(L_var1,var2) = L_shr(L_var1,var2) | |
| | else | |
| | L_shr_r(L_var1,var2) = L_add(L_shr(L_var1,var2),1) | |
| | - If var2 is less than or equal to zero : | |
| | L_shr_r(L_var1,var2) = L_shr(L_var1,var2). | |
| | | |
| | Complexity weight : 3 | |
| | | |
| | Inputs : | |
| | | |
| | L_var1 | |
| | 32 bit long signed integer (Word32) whose value falls in the | |
| | range : 0x8000 0000 <= var1 <= 0x7fff ffff. | |
| | | |
| | var2 | |
| | 16 bit short signed integer (Word16) whose value falls in the | |
| | range : 0xffff 8000 <= var1 <= 0x0000 7fff. | |
| | | |
| | Outputs : | |
| | | |
| | none | |
| | | |
| | Return Value : | |
| | | |
| | L_var_out | |
| | 32 bit long signed integer (Word32) whose value falls in the | |
| | range : 0x8000 0000 <= var_out <= 0x7fff ffff. | |
| |___________________________________________________________________________| |
| */ |
| #if (!L_SHR_R_IS_INLINE) |
| Word32 L_shr_r (Word32 L_var1, Word16 var2) |
| { |
| Word32 L_var_out; |
| |
| if (var2 > 31) |
| { |
| L_var_out = 0; |
| } |
| else |
| { |
| L_var_out = L_shr (L_var1, var2); |
| |
| if (var2 > 0) |
| { |
| if ((L_var1 & ((Word32) 1 << (var2 - 1))) != 0) |
| { |
| L_var_out++; |
| } |
| } |
| } |
| |
| return (L_var_out); |
| } |
| #endif |
| |
| /*___________________________________________________________________________ |
| | | |
| | Function Name : L_abs | |
| | | |
| | Purpose : | |
| | | |
| | Absolute value of L_var1; Saturate in case where the input is | |
| | -214783648 | |
| | | |
| | Complexity weight : 3 | |
| | | |
| | Inputs : | |
| | | |
| | L_var1 | |
| | 32 bit long signed integer (Word32) whose value falls in the | |
| | range : 0x8000 0000 <= var1 <= 0x7fff ffff. | |
| | | |
| | Outputs : | |
| | | |
| | none | |
| | | |
| | Return Value : | |
| | | |
| | L_var_out | |
| | 32 bit long signed integer (Word32) whose value falls in the | |
| | range : 0x0000 0000 <= var_out <= 0x7fff ffff. | |
| |___________________________________________________________________________| |
| */ |
| //Word32 L_abs (Word32 L_var1) |
| //{ |
| // Word32 L_var_out; |
| // |
| // if (L_var1 == MIN_32) |
| // { |
| // L_var_out = MAX_32; |
| // } |
| // else |
| // { |
| // if (L_var1 < 0) |
| // { |
| // L_var_out = -L_var1; |
| // } |
| // else |
| // { |
| // L_var_out = L_var1; |
| // } |
| // } |
| // |
| // return (L_var_out); |
| //} |
| |
| /*___________________________________________________________________________ |
| | | |
| | Function Name : norm_s | |
| | | |
| | Purpose : | |
| | | |
| | Produces the number of left shift needed to normalize the 16 bit varia- | |
| | ble var1 for positive values on the interval with minimum of 16384 and | |
| | maximum of 32767, and for negative values on the interval with minimum | |
| | of -32768 and maximum of -16384; in order to normalize the result, the | |
| | following operation must be done : | |
| | norm_var1 = shl(var1,norm_s(var1)). | |
| | | |
| | Complexity weight : 15 | |
| | | |
| | Inputs : | |
| | | |
| | var1 | |
| | 16 bit short signed integer (Word16) whose value falls in the | |
| | range : 0xffff 8000 <= var1 <= 0x0000 7fff. | |
| | | |
| | Outputs : | |
| | | |
| | none | |
| | | |
| | Return Value : | |
| | | |
| | var_out | |
| | 16 bit short signed integer (Word16) whose value falls in the | |
| | range : 0x0000 0000 <= var_out <= 0x0000 000f. | |
| |___________________________________________________________________________| |
| */ |
| |
| #if (!NORM_S_IS_INLINE) |
| Word16 norm_s (Word16 var1) |
| { |
| Word16 var_out; |
| |
| if (var1 == 0) |
| { |
| var_out = 0; |
| } |
| else |
| { |
| if (var1 == -1) |
| { |
| var_out = 15; |
| } |
| else |
| { |
| if (var1 < 0) |
| { |
| var1 = (Word16)~var1; |
| } |
| for (var_out = 0; var1 < 0x4000; var_out++) |
| { |
| var1 <<= 1; |
| } |
| } |
| } |
| |
| return (var_out); |
| } |
| #endif |
| |
| /*___________________________________________________________________________ |
| | | |
| | Function Name : div_s | |
| | | |
| | Purpose : | |
| | | |
| | Produces a result which is the fractional integer division of var1 by | |
| | var2; var1 and var2 must be positive and var2 must be greater or equal | |
| | to var1; the result is positive (leading bit equal to 0) and truncated | |
| | to 16 bits. | |
| | If var1 = var2 then div(var1,var2) = 32767. | |
| | | |
| | Complexity weight : 18 | |
| | | |
| | Inputs : | |
| | | |
| | var1 | |
| | 16 bit short signed integer (Word16) whose value falls in the | |
| | range : 0x0000 0000 <= var1 <= var2 and var2 != 0. | |
| | | |
| | var2 | |
| | 16 bit short signed integer (Word16) whose value falls in the | |
| | range : var1 <= var2 <= 0x0000 7fff and var2 != 0. | |
| | | |
| | Outputs : | |
| | | |
| | none | |
| | | |
| | Return Value : | |
| | | |
| | var_out | |
| | 16 bit short signed integer (Word16) whose value falls in the | |
| | range : 0x0000 0000 <= var_out <= 0x0000 7fff. | |
| | It's a Q15 value (point between b15 and b14). | |
| |___________________________________________________________________________| |
| */ |
| |
| #if (!DIV_S_IS_INLINE) |
| Word16 div_s (Word16 var1, Word16 var2) |
| { |
| Word16 var_out = 0; |
| Word16 iteration; |
| Word32 L_num; |
| Word32 L_denom; |
| |
| if (var1 == 0) |
| { |
| var_out = 0; |
| } |
| else |
| { |
| if (var1 == var2) |
| { |
| var_out = MAX_16; |
| } |
| else |
| { |
| L_num = L_deposit_l (var1); |
| L_denom = L_deposit_l (var2); |
| |
| for (iteration = 0; iteration < 15; iteration++) |
| { |
| var_out <<= 1; |
| L_num <<= 1; |
| |
| if (L_num >= L_denom) |
| { |
| L_num = L_sub(L_num, L_denom); |
| var_out = add (var_out, 1); |
| } |
| } |
| } |
| } |
| |
| return (var_out); |
| } |
| #endif |
| |
| /*___________________________________________________________________________ |
| | | |
| | Function Name : norm_l | |
| | | |
| | Purpose : | |
| | | |
| | Produces the number of left shifts needed to normalize the 32 bit varia-| |
| | ble L_var1 for positive values on the interval with minimum of | |
| | 1073741824 and maximum of 2147483647, and for negative values on the in-| |
| | terval with minimum of -2147483648 and maximum of -1073741824; in order | |
| | to normalize the result, the following operation must be done : | |
| | norm_L_var1 = L_shl(L_var1,norm_l(L_var1)). | |
| | | |
| | Complexity weight : 30 | |
| | | |
| | Inputs : | |
| | | |
| | L_var1 | |
| | 32 bit long signed integer (Word32) whose value falls in the | |
| | range : 0x8000 0000 <= var1 <= 0x7fff ffff. | |
| | | |
| | Outputs : | |
| | | |
| | none | |
| | | |
| | Return Value : | |
| | | |
| | var_out | |
| | 16 bit short signed integer (Word16) whose value falls in the | |
| | range : 0x0000 0000 <= var_out <= 0x0000 001f. | |
| |___________________________________________________________________________| |
| */ |
| |
| #if (!NORM_L_IS_INLINE) |
| Word16 norm_l (Word32 L_var1) |
| { |
| Word16 var_out; |
| |
| if (L_var1 == 0) |
| { |
| var_out = 0; |
| } |
| else |
| { |
| if (L_var1 == (Word32) 0xffffffffL) |
| { |
| var_out = 31; |
| } |
| else |
| { |
| if (L_var1 < 0) |
| { |
| L_var1 = ~L_var1; |
| } |
| for (var_out = 0; L_var1 < (Word32) 0x40000000L; var_out++) |
| { |
| L_var1 <<= 1; |
| } |
| } |
| } |
| |
| return (var_out); |
| } |
| #endif |
| |