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961d666be4
reciprocal if converting to the reciprocal is exact. Do it even if inexact if -ffast-math. This substantially speeds up ac.f90 from the polyhedron benchmarks. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154265 91177308-0d34-0410-b5e6-96231b3b80d8
33 lines
792 B
LLVM
33 lines
792 B
LLVM
; RUN: llc < %s -march=x86-64 | FileCheck %s
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; RUN: llc < %s -march=x86-64 -enable-unsafe-fp-math | FileCheck -check-prefix=UNSAFE %s
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define double @exact(double %x) {
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; Exact division by a constant always converted to multiplication.
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; CHECK: @exact
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; CHECK: mulsd
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; UNSAFE: @exact
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; UNSAFE: 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 if unsafe-math.
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; CHECK: @inexact
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; CHECK: divsd
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; UNSAFE: @inexact
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; UNSAFE: 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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; UNSAFE: @funky
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; UNSAFE: 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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