forked from OSchip/llvm-project
91 lines
2.3 KiB
LLVM
91 lines
2.3 KiB
LLVM
; NOTE: Assertions have been autogenerated by 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: 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: [[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: [[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: 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: 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: 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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; 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: [[TMP7:%.*]] = fadd float {{%.*}}, 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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