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ExpandPostRAPseudos: Fix alldefsAreDead() not removing operands

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One case left around nonsensical operands for the KILL instruction
which the machine verifier checks for nowadays. While this should not
hurt in release builds we should fix the machine verifier errors anyway.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@344008 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Matthias Braun 2018-10-09 00:07:34 +00:00
parent 48d3a5535e
commit 3ff2ad5558
2 changed files with 13 additions and 0 deletions
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2
lib/CodeGen/ExpandPostRAPseudos.cpp
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@ -97,6 +97,8 @@ bool ExpandPostRA::LowerSubregToReg(MachineInstr *MI) {
if (MI->allDefsAreDead()) {
MI->setDesc(TII->get(TargetOpcode::KILL));
MI->RemoveOperand(3); // SubIdx
MI->RemoveOperand(1); // Imm
LLVM_DEBUG(dbgs() << "subreg: replaced by: " << *MI);
return true;
}

11
test/CodeGen/X86/expand-post-ra-pseudo.mir Normal file
View File

@ -0,0 +1,11 @@
# RUN: llc -o - %s -mtriple=x86_64-- -run-pass=postrapseudos | FileCheck %s
---
# CHECK-LABEL: name: func
name: func
body: |
bb.0:
liveins: $eax
; CHECK-NOT: dead $rax = KILL {{[0-9]+}}
; CHECK: dead $rax = KILL killed $eax
dead $rax = SUBREG_TO_REG 0, killed $eax, %subreg.sub_32bit
...