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Before reevaluating instructions, iterate over all instructions to be reevaluated and remove trivially dead instructions and if any of it's operands become trivially dead, mark it for deletion until all trivially dead instructions have been removed llvm-svn: 256773
35 lines
891 B
LLVM
35 lines
891 B
LLVM
; RUN: opt -S -reassociate < %s | FileCheck %s
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; CHECK-LABEL: main
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; CHECK: %2 = fsub
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; CHECK: %3 = fsub
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; CHECK: fadd fast float %3, %2
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define void @main(float, float) {
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wrapper_entry:
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%2 = fsub float undef, %0
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%3 = fsub float undef, %1
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%4 = call float @llvm.rsqrt.f32(float undef)
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%5 = fmul fast float undef, %4
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%6 = fmul fast float %2, %4
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%7 = fmul fast float %3, %4
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%8 = fmul fast float %5, undef
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%9 = fmul fast float %6, undef
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%10 = fmul fast float %7, undef
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%11 = fadd fast float %8, %9
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%12 = fadd fast float %11, %10
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%13 = call float @foo2(float %12, float 0.000000e+00)
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%mul36 = fmul fast float %13, 1.500000e+00
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call void @foo1(i32 4, float %mul36)
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ret void
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}
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declare void @foo1(i32, float)
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declare float @foo2(float, float) #1
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declare float @llvm.rsqrt.f32(float) #1
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attributes #0 = { argmemonly nounwind }
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attributes #1 = { nounwind readnone }
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