| //.include "ihevc_neon_macros.s" |
| .macro push_v_regs |
| stp x8, x9, [sp, #-16]! |
| stp x10, X11, [sp, #-16]! |
| stp X12, X13, [sp, #-16]! |
| stp X14, X15, [sp, #-16]! |
| stp X29, X30, [sp, #-16]! |
| .endm |
| .macro pop_v_regs |
| ldp X29, X30, [sp], #16 |
| ldp X14, X15, [sp], #16 |
| ldp X12, X13, [sp], #16 |
| ldp X10, X11, [sp], #16 |
| ldp X8, X9, [sp], #16 |
| .endm |
| |
| .text |
| .p2align 2 |
| .global ixheaacd_postradixcompute4 |
| |
| |
| ixheaacd_postradixcompute4: |
| |
| // STMFD sp!, {x4-x12, x14} |
| push_v_regs |
| //SUB sp, sp, #16 |
| |
| //HARD CODED for FFT Length of 16 |
| // x3 is always 16 |
| |
| |
| //SUB x4, x3, #2 ; y to y offset calculated |
| //MOV x4, #14 |
| //STR x4, [sp, #8] ; (npoints / 2)*4bytes - 4bytes |
| |
| //STR x0, [sp, #12] ; (3*(npoints/2))*4bytes - 4bytes |
| // x0 to x2 offset (npoints / 2)*4bytes |
| ADD x4, x1, x3, lsl #1 // x1 -> x0, x4 -> x2 |
| MOV x3, #2 |
| |
| |
| POSTRADIX4_START: |
| |
| // LDMIA x1!, {x5-x12} // x_0 :x_7 |
| |
| LDP w5, w6, [x1], #8 // x_0 :x_1 |
| LDP w7, w8, [x1], #8 // x_2 :x_3 |
| LDP w9, w10, [x1], #8 // x_4 :x_5 |
| LDP w11, w12, [x1], #8 // x_6 :x_7 |
| |
| ADD w14, w5, w9 // xh0_0 = x_0 + x_4 |
| SUB w5, w5, w9 // xl0_0 = x_0 - x_4 |
| |
| ADD w9, w6, w10 // xh1_0 = x_1 + x_5 |
| SUB w6, w6, w10 // xl1_0 = x_1 - x_5 |
| |
| ADD w10, w7, w11 // xh0_1 = x_2 + x_6 |
| SUB w7, w7, w11 // xl0_1 = x_2 - x_6 |
| |
| ADD w11, w8, w12 // xh1_1 = x_3 + x_7 |
| SUB w8, w8, w12 // xl1_1 = x_3 - x_7 |
| |
| ADD w12, w14, w10 // n00 = xh0_0 + xh0_1 |
| SUB w14, w14, w10 // n20 = xh0_0 - xh0_1 |
| |
| ADD w10, w9, w11 // n01 = xh1_0 + xh1_1 |
| SUB w9, w9, w11 // n21 = xh1_0 - xh1_1 |
| |
| ADD w11, w5, w8 // n10 = xl0_0 + xl1_1 |
| SUB w5, w5, w8 // n30 = xl0_0 - xl1_1 |
| |
| ADD w8, w6, w7 // n31 = xl1_0 + xl0_1 |
| SUB w6, w6, w7 // n11 = xl1_0 - xl0_1 |
| |
| |
| STR w12, [x0], #4 // y0[h2] = n00, x7 -> y0[h2 + 1] |
| |
| STR w10, [x0], #14<<1 // y0[h2 + 1] = n01, x7 -> y1[h2] |
| |
| STR w11, [x0], #4 // y1[h2] = n10, x7 -> y1[h2 + 1] |
| STR w6 , [x0], #14<<1 // y1[h2 + 1] = n11, x7 -> y2[h2] |
| |
| STR w14, [x0], #4 // y2[h2] = n20, x7 -> y2[h2 + 1] |
| STR w9 , [x0], #14<<1 // y2[h2 + 1] = n21, x7 -> y3[h2] |
| |
| STR w5, [x0], #4 // y3[h2] = n30, x7 -> y3[h2 + 1] |
| STR w8, [x0], #0 // y3[h2 + 1] = n31, x7 -> y0[h2+2] |
| |
| // LDMIA x4!, {x5-x12} // x_0 :x_7 |
| |
| LDP w5, w6, [x4], #8 // x_8 :x_8 |
| LDP w7, w8, [x4], #8 // x_a :x_b |
| LDP w9, w10, [x4], #8 // x_c :x_d |
| LDP w11, w12, [x4], #8 // x_e :x_f |
| |
| SUB x0, x0, #92 // #4*3 + #14<<1 * 3 - 8 |
| |
| |
| ADD w14, w5, w9 |
| SUB w5, w5, w9 |
| |
| ADD w9, w6, w10 |
| SUB w6, w6, w10 |
| |
| ADD w10, w7, w11 |
| SUB w7, w7, w11 |
| |
| ADD w11, w8, w12 |
| SUB w8, w8, w12 |
| |
| ADD w12, w14, w10 |
| SUB w14, w14, w10 |
| |
| ADD w10, w9, w11 |
| SUB w9, w9, w11 |
| |
| ADD w11, w5, w8 |
| SUB w5, w5, w8 |
| |
| ADD w8, w6, w7 |
| SUB w6, w6, w7 |
| |
| STR w12, [x0], #4 |
| STR w10, [x0], #14<<1 |
| |
| STR w11, [x0], #4 |
| STR w6, [x0], #14<<1 |
| |
| STR w14, [x0], #4 |
| STR w9, [x0], #14<<1 |
| |
| |
| STR w5, [x0], #4 |
| STR w8, [x0], #0 |
| |
| ADD x1, x1, #1 << 5 // x0 += (Word32) npoints >> 1 |
| ADD x4, x4, #1 << 5 // x2 += (Word32) npoints >> 1 |
| SUB x0, x0, #100-8 |
| |
| SUBS w3, w3, #1 |
| |
| BGT POSTRADIX4_START |
| |
| // LDMFD sp!, {x4-x12, x15} |
| pop_v_regs |
| ret |
| |
| |
