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0eb872067d
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 llvm-svn: 268831
15 lines
327 B
LLVM
15 lines
327 B
LLVM
; RUN: llc -mtriple=x86_64-unknown-linux-gnu < %s | FileCheck %s
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define i2 @f(i32 %arg) {
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%trunc = trunc i32 %arg to i1
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%sext = sext i1 %trunc to i2
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%or = or i2 %sext, 1
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ret i2 %or
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; CHECK-LABEL: f:
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; CHECK: addb %dil, %dil
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; CHECK-NEXT: orb $1, %dil
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; CHECK-NEXT: movl %edi, %eax
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; CHECK-NEXT: retq
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}
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