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d65fa7c292
Just because we can constant fold the result of an instruction does not imply that we can delete the instruction. It may have side effects. This fixes PR28655. llvm-svn: 276389
63 lines
1.9 KiB
LLVM
63 lines
1.9 KiB
LLVM
; RUN: opt < %s -instcombine -S | FileCheck %s
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define double @log_pow(double %x, double %y) {
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%pow = call fast double @llvm.pow.f64(double %x, double %y)
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%call = call fast double @log(double %pow)
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ret double %call
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}
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; CHECK-LABEL: define double @log_pow(
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; CHECK-NEXT: %log = call fast double @log(double %x)
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; CHECK-NEXT: %mul = fmul fast double %log, %y
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; CHECK-NEXT: ret double %mul
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define double @log_pow_not_fast(double %x, double %y) {
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%pow = call double @llvm.pow.f64(double %x, double %y)
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%call = call fast double @log(double %pow)
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ret double %call
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}
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; CHECK-LABEL: define double @log_pow_not_fast(
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; CHECK-NEXT: %pow = call double @llvm.pow.f64(double %x, double %y)
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; CHECK-NEXT: %call = call fast double @log(double %pow)
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; CHECK-NEXT: ret double %call
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define double @function_pointer(double ()* %fptr, double %p1) {
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%call1 = call double %fptr()
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%pow = call double @log(double %call1)
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ret double %pow
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}
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; CHECK-LABEL: @function_pointer
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; CHECK-NEXT: %call1 = call double %fptr()
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; CHECK-NEXT: %pow = call double @log(double %call1)
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; CHECK-NEXT: ret double %pow
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define double @log_exp2(double %x) {
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%call2 = call fast double @exp2(double %x)
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%call3 = call fast double @log(double %call2)
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ret double %call3
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}
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; CHECK-LABEL: @log_exp2
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; CHECK-NEXT: %call2 = call fast double @exp2(double %x)
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; CHECK-NEXT: %logmul = fmul fast double %x, 0x3FE62E42FEFA39EF
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; CHECK-NEXT: ret double %logmul
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define double @log_exp2_not_fast(double %x) {
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%call2 = call double @exp2(double %x)
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%call3 = call fast double @log(double %call2)
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ret double %call3
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}
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; CHECK-LABEL: @log_exp2_not_fast
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; CHECK-NEXT: %call2 = call double @exp2(double %x)
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; CHECK-NEXT: %call3 = call fast double @log(double %call2)
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; CHECK-NEXT: ret double %call3
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declare double @log(double) #0
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declare double @exp2(double)
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declare double @llvm.pow.f64(double, double)
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attributes #0 = { nounwind readnone }
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