llvm-project/llvm/test/Transforms/Reassociate/fast-fp-commute.ll

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; RUN: opt -reassociate -S < %s | FileCheck %s
declare void @use(float)
define void @test1(float %x, float %y) {
; CHECK-LABEL: test1
; CHECK: fmul fast float %y, %x
; CHECK: fmul fast float %y, %x
; CHECK: fsub fast float %1, %2
; CHECK: call void @use(float %{{.*}})
; CHECK: call void @use(float %{{.*}})
%1 = fmul fast float %x, %y
%2 = fmul fast float %y, %x
%3 = fsub fast float %1, %2
call void @use(float %1)
call void @use(float %3)
ret void
}
define float @test2(float %x, float %y) {
; CHECK-LABEL: test2
; CHECK-NEXT: fmul fast float %y, %x
; CHECK-NEXT: fmul fast float %y, %x
; CHECK-NEXT: fsub fast float %1, %2
; CHECK-NEXT: ret float %3
%1 = fmul fast float %x, %y
%2 = fmul fast float %y, %x
%3 = fsub fast float %1, %2
ret float %3
}
define float @test3(float %x, float %y) {
; CHECK-LABEL: test3
; CHECK-NEXT: %factor = fmul fast float %y, 2.000000e+00
; CHECK-NEXT: %tmp1 = fmul fast float %factor, %x
; CHECK-NEXT: ret float %tmp1
%1 = fmul fast float %x, %y
%2 = fmul fast float %y, %x
%3 = fadd fast float %1, %2
ret float %3
}