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507bb7a42f
multiplication by a denormal, and some tests checking that. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154431 91177308-0d34-0410-b5e6-96231b3b80d8
42 lines
972 B
LLVM
42 lines
972 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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define double @denormal1(double %x) {
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; Don't generate multiplication by a denormal.
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; CHECK: @denormal1
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; CHECK: divsd
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%div = fdiv double %x, 0x7FD0000000000001
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ret double %div
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}
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define double @denormal2(double %x) {
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; Don't generate multiplication by a denormal.
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; CHECK: @denormal
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; CHECK: divsd
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%div = fdiv double %x, 0x7FEFFFFFFFFFFFFF
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ret double %div
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}
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