forked from OSchip/llvm-project
252 lines
8.3 KiB
LLVM
252 lines
8.3 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -instsimplify -S | FileCheck %s
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; fsub -0.0, (fsub -0.0, X) ==> X
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define float @fsub_-0_-0_x(float %a) {
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; CHECK-LABEL: @fsub_-0_-0_x(
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; CHECK-NEXT: ret float %a
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;
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%t1 = fsub float -0.0, %a
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%ret = fsub float -0.0, %t1
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ret float %ret
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}
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; fsub 0.0, (fsub -0.0, X) != X
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define float @fsub_0_-0_x(float %a) {
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; CHECK-LABEL: @fsub_0_-0_x(
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; CHECK-NEXT: [[T1:%.*]] = fsub float 0.000000e+00, %a
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; CHECK-NEXT: [[RET:%.*]] = fsub float -0.000000e+00, [[T1]]
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; CHECK-NEXT: ret float [[RET]]
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;
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%t1 = fsub float 0.0, %a
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%ret = fsub float -0.0, %t1
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ret float %ret
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}
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; fsub -0.0, (fsub 0.0, X) != X
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define float @fsub_-0_0_x(float %a) {
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; CHECK-LABEL: @fsub_-0_0_x(
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; CHECK-NEXT: [[T1:%.*]] = fsub float -0.000000e+00, %a
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; CHECK-NEXT: [[RET:%.*]] = fsub float 0.000000e+00, [[T1]]
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; CHECK-NEXT: ret float [[RET]]
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;
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%t1 = fsub float -0.0, %a
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%ret = fsub float 0.0, %t1
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ret float %ret
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}
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; fsub X, 0 ==> X
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define float @fsub_x_0(float %a) {
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; CHECK-LABEL: @fsub_x_0(
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; CHECK-NEXT: ret float %a
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;
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%ret = fsub float %a, 0.0
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ret float %ret
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}
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; fadd X, -0 ==> X
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define float @fadd_x_n0(float %a) {
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; CHECK-LABEL: @fadd_x_n0(
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; CHECK-NEXT: ret float %a
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;
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%ret = fadd float %a, -0.0
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ret float %ret
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}
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; fmul X, 1.0 ==> X
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define double @fmul_X_1(double %a) {
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; CHECK-LABEL: @fmul_X_1(
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; CHECK-NEXT: ret double %a
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;
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%b = fmul double 1.000000e+00, %a
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ret double %b
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}
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; fdiv X, 1.0 ==> X
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define float @fdiv_x_1(float %a) {
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; CHECK-LABEL: @fdiv_x_1(
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; CHECK-NEXT: ret float %a
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;
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%ret = fdiv float %a, 1.0
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ret float %ret
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}
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; We can't optimize away the fadd in this test because the input
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; value to the function and subsequently to the fadd may be -0.0.
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; In that one special case, the result of the fadd should be +0.0
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; rather than the first parameter of the fadd.
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; Fragile test warning: We need 6 sqrt calls to trigger the bug
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; because the internal logic has a magic recursion limit of 6.
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; This is presented without any explanation or ability to customize.
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declare float @sqrtf(float)
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define float @PR22688(float %x) {
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; CHECK-LABEL: @PR22688(
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; CHECK-NEXT: [[TMP1:%.*]] = call float @sqrtf(float %x)
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; CHECK-NEXT: [[TMP2:%.*]] = call float @sqrtf(float [[TMP1]])
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; CHECK-NEXT: [[TMP3:%.*]] = call float @sqrtf(float [[TMP2]])
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; CHECK-NEXT: [[TMP4:%.*]] = call float @sqrtf(float [[TMP3]])
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; CHECK-NEXT: [[TMP5:%.*]] = call float @sqrtf(float [[TMP4]])
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; CHECK-NEXT: [[TMP6:%.*]] = call float @sqrtf(float [[TMP5]])
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; CHECK-NEXT: [[TMP7:%.*]] = fadd float [[TMP6]], 0.000000e+00
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; CHECK-NEXT: ret float [[TMP7]]
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;
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%1 = call float @sqrtf(float %x)
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%2 = call float @sqrtf(float %1)
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%3 = call float @sqrtf(float %2)
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%4 = call float @sqrtf(float %3)
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%5 = call float @sqrtf(float %4)
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%6 = call float @sqrtf(float %5)
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%7 = fadd float %6, 0.0
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ret float %7
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}
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declare float @llvm.fabs.f32(float)
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declare float @llvm.sqrt.f32(float)
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; CHECK-LABEL: @fabs_select_positive_constants(
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; CHECK: %select = select i1 %cmp, float 1.000000e+00, float 2.000000e+00
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; CHECK-NEXT: ret float %select
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define float @fabs_select_positive_constants(i32 %c) {
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%cmp = icmp eq i32 %c, 0
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%select = select i1 %cmp, float 1.0, float 2.0
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%fabs = call float @llvm.fabs.f32(float %select)
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ret float %fabs
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}
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; CHECK-LABEL: @fabs_select_constant_variable(
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; CHECK: %select = select i1 %cmp, float 1.000000e+00, float %x
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; CHECK-NEXT: %fabs = call float @llvm.fabs.f32(float %select)
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define float @fabs_select_constant_variable(i32 %c, float %x) {
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%cmp = icmp eq i32 %c, 0
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%select = select i1 %cmp, float 1.0, float %x
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%fabs = call float @llvm.fabs.f32(float %select)
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ret float %fabs
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}
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; CHECK-LABEL: @fabs_select_neg0_pos0(
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; CHECK: %select = select i1 %cmp, float -0.000000e+00, float 0.000000e+00
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; CHECK: %fabs = call float @llvm.fabs.f32(float %select)
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; CHECK-NEXT: ret float %fabs
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define float @fabs_select_neg0_pos0(float addrspace(1)* %out, i32 %c) {
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%cmp = icmp eq i32 %c, 0
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%select = select i1 %cmp, float -0.0, float 0.0
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%fabs = call float @llvm.fabs.f32(float %select)
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ret float %fabs
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}
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; CHECK-LABEL: @fabs_select_neg0_neg1(
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; CHECK: %select = select i1 %cmp, float -0.000000e+00, float -1.000000e+00
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; CHECK: %fabs = call float @llvm.fabs.f32(float %select)
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define float @fabs_select_neg0_neg1(float addrspace(1)* %out, i32 %c) {
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%cmp = icmp eq i32 %c, 0
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%select = select i1 %cmp, float -0.0, float -1.0
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%fabs = call float @llvm.fabs.f32(float %select)
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ret float %fabs
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}
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; CHECK-LABEL: @fabs_select_nan_nan(
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; CHECK: %select = select i1 %cmp, float 0x7FF8000000000000, float 0x7FF8000100000000
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; CHECK-NEXT: ret float %select
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define float @fabs_select_nan_nan(float addrspace(1)* %out, i32 %c) {
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%cmp = icmp eq i32 %c, 0
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%select = select i1 %cmp, float 0x7FF8000000000000, float 0x7FF8000100000000
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%fabs = call float @llvm.fabs.f32(float %select)
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ret float %fabs
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}
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; CHECK-LABEL: @fabs_select_negnan_nan(
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; CHECK: %select = select i1 %cmp, float 0xFFF8000000000000, float 0x7FF8000000000000
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; CHECK: %fabs = call float @llvm.fabs.f32(float %select)
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define float @fabs_select_negnan_nan(float addrspace(1)* %out, i32 %c) {
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%cmp = icmp eq i32 %c, 0
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%select = select i1 %cmp, float 0xFFF8000000000000, float 0x7FF8000000000000
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%fabs = call float @llvm.fabs.f32(float %select)
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ret float %fabs
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}
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; CHECK-LABEL: @fabs_select_negnan_negnan(
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; CHECK: %select = select i1 %cmp, float 0xFFF8000000000000, float 0x7FF8000100000000
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; CHECK: %fabs = call float @llvm.fabs.f32(float %select)
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define float @fabs_select_negnan_negnan(float addrspace(1)* %out, i32 %c) {
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%cmp = icmp eq i32 %c, 0
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%select = select i1 %cmp, float 0xFFF8000000000000, float 0x7FF8000100000000
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%fabs = call float @llvm.fabs.f32(float %select)
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ret float %fabs
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}
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; CHECK-LABEL: @fabs_select_negnan_negzero(
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; CHECK: %select = select i1 %cmp, float 0xFFF8000000000000, float -0.000000e+00
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; CHECK: %fabs = call float @llvm.fabs.f32(float %select)
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define float @fabs_select_negnan_negzero(float addrspace(1)* %out, i32 %c) {
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%cmp = icmp eq i32 %c, 0
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%select = select i1 %cmp, float 0xFFF8000000000000, float -0.0
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%fabs = call float @llvm.fabs.f32(float %select)
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ret float %fabs
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}
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; CHECK-LABEL: @fabs_select_negnan_zero(
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; CHECK: %select = select i1 %cmp, float 0xFFF8000000000000, float 0.000000e+00
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; CHECK: %fabs = call float @llvm.fabs.f32(float %select)
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define float @fabs_select_negnan_zero(float addrspace(1)* %out, i32 %c) {
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%cmp = icmp eq i32 %c, 0
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%select = select i1 %cmp, float 0xFFF8000000000000, float 0.0
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%fabs = call float @llvm.fabs.f32(float %select)
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ret float %fabs
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}
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; CHECK-LABEL: @fabs_sqrt
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; CHECK: call float @llvm.sqrt.f32
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; CHECK: call float @llvm.fabs.f32
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define float @fabs_sqrt(float %a) {
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; The fabs can't be eliminated because llvm.sqrt.f32 may return -0 or NaN with
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; an arbitrary sign bit.
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%sqrt = call float @llvm.sqrt.f32(float %a)
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%fabs = call float @llvm.fabs.f32(float %sqrt)
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ret float %fabs
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}
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; CHECK-LABEL: @fabs_sqrt_nnan
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; CHECK: call nnan float @llvm.sqrt.f32
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; CHECK: call float @llvm.fabs.f32
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define float @fabs_sqrt_nnan(float %a) {
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; The fabs can't be eliminated because the nnan sqrt may still return -0.
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%sqrt = call nnan float @llvm.sqrt.f32(float %a)
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%fabs = call float @llvm.fabs.f32(float %sqrt)
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ret float %fabs
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}
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; CHECK-LABEL: @fabs_sqrt_nsz
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; CHECK: call nsz float @llvm.sqrt.f32
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; CHECK: call float @llvm.fabs.f32
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define float @fabs_sqrt_nsz(float %a) {
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; The fabs can't be eliminated because the nsz sqrt may still return NaN.
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%sqrt = call nsz float @llvm.sqrt.f32(float %a)
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%fabs = call float @llvm.fabs.f32(float %sqrt)
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ret float %fabs
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}
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; CHECK-LABEL: @fabs_sqrt_nnan_nsz
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; CHECK: call nnan nsz float @llvm.sqrt.f32
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; CHECK-NOT: call float @llvm.fabs.f32
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define float @fabs_sqrt_nnan_nsz(float %a) {
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; The fabs can be eliminated because we're nsz and nnan.
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%sqrt = call nnan nsz float @llvm.sqrt.f32(float %a)
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%fabs = call float @llvm.fabs.f32(float %sqrt)
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ret float %fabs
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}
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; CHECK-LABEL: @fabs_sqrt_nnan_fabs
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; CHECK: call float @llvm.fabs.f32
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; CHECK: call nnan float @llvm.sqrt.f32
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; CHECK-NOT: call float @llvm.fabs.f32
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define float @fabs_sqrt_nnan_fabs(float %a) {
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; The second fabs can be eliminated because the operand to sqrt cannot be -0.
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%b = call float @llvm.fabs.f32(float %a)
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%sqrt = call nnan float @llvm.sqrt.f32(float %b)
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%fabs = call float @llvm.fabs.f32(float %sqrt)
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ret float %fabs
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}
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