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3ef3fcfc04
when -ffast-math, i.e. don't just always do it if the reciprocal can be formed exactly. There is already an IR level transform that does that, and it does it more carefully. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154296 91177308-0d34-0410-b5e6-96231b3b80d8
26 lines
603 B
LLVM
26 lines
603 B
LLVM
; RUN: llc < %s -march=x86-64 -enable-unsafe-fp-math | FileCheck %s
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define double @exact(double %x) {
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; Exact division by a constant converted to multiplication.
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; CHECK: @exact
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; CHECK: mulsd
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%div = fdiv double %x, 2.0
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ret double %div
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}
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define double @inexact(double %x) {
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; Inexact division by a constant converted to multiplication.
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; CHECK: @inexact
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; CHECK: mulsd
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%div = fdiv double %x, 0x41DFFFFFFFC00000
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ret double %div
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}
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define double @funky(double %x) {
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; No conversion to multiplication if too funky.
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; CHECK: @funky
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; CHECK: divsd
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%div = fdiv double %x, 0.0
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ret double %div
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}
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