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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
19 lines
460 B
LLVM
19 lines
460 B
LLVM
; RUN: llc < %s -march=x86-64 -stress-sched | FileCheck %s
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; REQUIRES: asserts
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; Test interference between physreg aliases during preRAsched.
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; mul wants an operand in AL, but call clobbers it.
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define i8 @f(i8 %v1, i8 %v2) nounwind {
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entry:
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; CHECK: callq
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; CHECK: movl %{{.*}}, %eax
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; CHECK: mulb
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; CHECK: mulb
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%rval = tail call i8 @bar() nounwind
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%m1 = mul i8 %v1, %v2
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%m2 = mul i8 %m1, %rval
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ret i8 %m2
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}
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declare i8 @bar()
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