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d2c64e2df9
With a diabolically crafted test case, we could recurse through this code and return true instead of false. The larger engineering crime is the use of magic numbers. Added FIXME comments for those. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@230515 91177308-0d34-0410-b5e6-96231b3b80d8
62 lines
1.5 KiB
LLVM
62 lines
1.5 KiB
LLVM
; RUN: opt < %s -instsimplify -S | FileCheck %s
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; fsub 0, (fsub 0, X) ==> X
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; CHECK-LABEL: @fsub_0_0_x(
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define float @fsub_0_0_x(float %a) {
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%t1 = fsub float -0.0, %a
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%ret = fsub float -0.0, %t1
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; CHECK: ret float %a
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ret float %ret
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}
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; fsub X, 0 ==> X
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; CHECK-LABEL: @fsub_x_0(
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define float @fsub_x_0(float %a) {
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%ret = fsub float %a, 0.0
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; CHECK: ret float %a
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ret float %ret
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}
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; fadd X, -0 ==> X
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; CHECK-LABEL: @fadd_x_n0(
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define float @fadd_x_n0(float %a) {
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%ret = fadd float %a, -0.0
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; CHECK: ret float %a
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ret float %ret
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}
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; fmul X, 1.0 ==> X
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; CHECK-LABEL: @fmul_X_1(
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define double @fmul_X_1(double %a) {
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%b = fmul double 1.000000e+00, %a ; <double> [#uses=1]
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; CHECK: ret double %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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%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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; CHECK-LABEL: @PR22688(
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; CHECK: fadd float %6, 0.0
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}
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