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4c690f3954
This re-applies r268760, reverted in r268794. Fixes http://llvm.org/PR27670 The original imp-defs assertion was way overzealous: forward all implicit operands, except imp-defs of the new super-reg def (r268787 for GR64, but also possible for GR16->GR32), or imp-uses of the new super-reg use. While there, mark the source use as Undef, and add an imp-use of the old source reg: that should cover any case of dead super-regs. At the stage the pass runs, flags are unlikely to matter anyway; still, let's be as correct as possible. Also add MIR tests for the various interesting cases. Original commit message: Codesize is less (16) or equal (8), and we avoid partial dependencies. Differential Revision: http://reviews.llvm.org/D19999 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@268831 91177308-0d34-0410-b5e6-96231b3b80d8
33 lines
947 B
LLVM
33 lines
947 B
LLVM
; RUN: llc -mtriple=i686-unknown-linux-gnu -march=x86-64 -mcpu=x86-64 < %s | FileCheck %s
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; Make sure the float conversion is folded away as it should be.
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; CHECK-LABEL: foo
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; CHECK-NOT: cvt
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; CHECK: movzbl
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define i32 @foo(i8 %a) #0 {
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%conv = uitofp i8 %a to float
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%conv1 = fptosi float %conv to i32
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ret i32 %conv1
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}
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; CHECK-LABEL: foo2
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; CHECK-NOT: cvt
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; CHECK: movsbl
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define i32 @foo2(i8 %a) #0 {
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%conv = sitofp i8 %a to float
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%conv1 = fptosi float %conv to i32
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ret i32 %conv1
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}
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; CHECK-LABEL: bar
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; CHECK-NOT: cvt
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; CHECK: movl
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define zeroext i8 @bar(i8 zeroext %a) #0 {
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%conv = uitofp i8 %a to float
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%conv1 = fptoui float %conv to i8
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ret i8 %conv1
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}
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attributes #0 = { nounwind ssp uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
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