| ; RUN: opt < %s -reassociate -S | FileCheck %s |
| ; CHECK-LABEL: faddsubAssoc1 |
| ; CHECK: [[TMP1:%.*]] = fsub fast half 0xH8000, %a |
| ; CHECK: [[TMP2:%.*]] = fadd fast half %b, [[TMP1]] |
| ; CHECK: fmul fast half [[TMP2]], 0xH4500 |
| ; CHECK: ret |
| ; Input is A op (B op C) |
| define half @faddsubAssoc1(half %a, half %b) { |
| %tmp1 = fmul fast half %b, 0xH4200 ; 3*b |
| %tmp2 = fmul fast half %a, 0xH4500 ; 5*a |
| %tmp3 = fmul fast half %b, 0xH4000 ; 2*b |
| %tmp4 = fsub fast half %tmp2, %tmp1 ; 5 * a - 3 * b |
| %tmp5 = fsub fast half %tmp3, %tmp4 ; 2 * b - ( 5 * a - 3 * b) |
| ret half %tmp5 ; = 5 * (b - a) |
| } |
| |
| ; CHECK-LABEL: faddsubAssoc2 |
| ; CHECK: [[TMP1:%tmp.*]] = fmul fast half %a, 0xH4500 |
| ; CHECK: [[TMP2:%tmp.*]] = fmul fast half %b, 0xH3C00 |
| ; CHECK: fadd fast half [[TMP2]], [[TMP1]] |
| ; CHECK: ret |
| ; Input is (A op B) op C |
| define half @faddsubAssoc2(half %a, half %b) { |
| %tmp1 = fmul fast half %b, 0xH4200 ; 3*b |
| %tmp2 = fmul fast half %a, 0xH4500 ; 5*a |
| %tmp3 = fmul fast half %b, 0xH4000 ; 2*b |
| %tmp4 = fadd fast half %tmp2, %tmp1 ; 5 * a + 3 * b |
| %tmp5 = fsub fast half %tmp4, %tmp3 ; (5 * a + 3 * b) - (2 * b) |
| ret half %tmp5 ; = 5 * a + b |
| } |
| |