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llvm-mirror/test/Transforms/InstCombine/fdiv.ll
Benjamin Kramer e6e5b11a65 Avoid turning a floating point division with a constant power of two into a denormal multiplication.
Some platforms may treat denormals as zero, on other platforms multiplication
with a subnormal is slower than dividing by a normal.

llvm-svn: 128555
2011-03-30 17:02:54 +00:00

26 lines
593 B
LLVM

; RUN: opt -S -instcombine < %s | FileCheck %s
define float @test1(float %x) nounwind readnone ssp {
%div = fdiv float %x, 0x3810000000000000
ret float %div
; CHECK: @test1
; CHECK-NEXT: fmul float %x, 0x47D0000000000000
}
define float @test2(float %x) nounwind readnone ssp {
%div = fdiv float %x, 0x47E0000000000000
ret float %div
; CHECK: @test2
; CHECK-NEXT: fdiv float %x, 0x47E0000000000000
}
define float @test3(float %x) nounwind readnone ssp {
%div = fdiv float %x, 0x36A0000000000000
ret float %div
; CHECK: @test3
; CHECK-NEXT: fdiv float %x, 0x36A0000000000000
}