| ; NOTE: Assertions have been autogenerated by update_test_checks.py |
| ; RUN: opt < %s -instsimplify -S | FileCheck %s |
| |
| ; fsub -0.0, (fsub -0.0, X) ==> X |
| define float @fsub_-0_-0_x(float %a) { |
| ; CHECK-LABEL: @fsub_-0_-0_x( |
| ; CHECK: ret float %a |
| ; |
| %t1 = fsub float -0.0, %a |
| %ret = fsub float -0.0, %t1 |
| ret float %ret |
| } |
| |
| ; fsub 0.0, (fsub -0.0, X) != X |
| define float @fsub_0_-0_x(float %a) { |
| ; CHECK-LABEL: @fsub_0_-0_x( |
| ; CHECK: [[T1:%.*]] = fsub float 0.000000e+00, %a |
| ; CHECK-NEXT: [[RET:%.*]] = fsub float -0.000000e+00, [[T1]] |
| ; CHECK-NEXT: ret float [[RET]] |
| ; |
| %t1 = fsub float 0.0, %a |
| %ret = fsub float -0.0, %t1 |
| ret float %ret |
| } |
| |
| ; fsub -0.0, (fsub 0.0, X) != X |
| define float @fsub_-0_0_x(float %a) { |
| ; CHECK-LABEL: @fsub_-0_0_x( |
| ; CHECK: [[T1:%.*]] = fsub float -0.000000e+00, %a |
| ; CHECK-NEXT: [[RET:%.*]] = fsub float 0.000000e+00, [[T1]] |
| ; CHECK-NEXT: ret float [[RET]] |
| ; |
| %t1 = fsub float -0.0, %a |
| %ret = fsub float 0.0, %t1 |
| ret float %ret |
| } |
| |
| ; fsub X, 0 ==> X |
| define float @fsub_x_0(float %a) { |
| ; CHECK-LABEL: @fsub_x_0( |
| ; CHECK: ret float %a |
| ; |
| %ret = fsub float %a, 0.0 |
| ret float %ret |
| } |
| |
| ; fadd X, -0 ==> X |
| define float @fadd_x_n0(float %a) { |
| ; CHECK-LABEL: @fadd_x_n0( |
| ; CHECK: ret float %a |
| ; |
| %ret = fadd float %a, -0.0 |
| ret float %ret |
| } |
| |
| ; fmul X, 1.0 ==> X |
| define double @fmul_X_1(double %a) { |
| ; CHECK-LABEL: @fmul_X_1( |
| ; CHECK: ret double %a |
| ; |
| %b = fmul double 1.000000e+00, %a |
| ret double %b |
| } |
| |
| ; We can't optimize away the fadd in this test because the input |
| ; value to the function and subsequently to the fadd may be -0.0. |
| ; In that one special case, the result of the fadd should be +0.0 |
| ; rather than the first parameter of the fadd. |
| |
| ; Fragile test warning: We need 6 sqrt calls to trigger the bug |
| ; because the internal logic has a magic recursion limit of 6. |
| ; This is presented without any explanation or ability to customize. |
| |
| declare float @sqrtf(float) |
| |
| define float @PR22688(float %x) { |
| ; CHECK-LABEL: @PR22688( |
| ; CHECK: [[TMP7:%.*]] = fadd float {{%.*}}, 0.000000e+00 |
| ; CHECK-NEXT: ret float [[TMP7]] |
| ; |
| %1 = call float @sqrtf(float %x) |
| %2 = call float @sqrtf(float %1) |
| %3 = call float @sqrtf(float %2) |
| %4 = call float @sqrtf(float %3) |
| %5 = call float @sqrtf(float %4) |
| %6 = call float @sqrtf(float %5) |
| %7 = fadd float %6, 0.0 |
| ret float %7 |
| } |
| |