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[Hexagon] Make sure that RDF does not remove EH_LABELs

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Since EH_LABELs (and other labels) no longer have "side-effects", they
should be checked for separately.

llvm-svn: 318801
This commit is contained in:
Krzysztof Parzyszek 2017-11-21 21:05:51 +00:00
parent 8295be1621
commit 10ae105d9b
2 changed files with 19 additions and 1 deletions
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3
lib/Target/Hexagon/RDFDeadCode.cpp
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@ -58,7 +58,8 @@ private:
bool DeadCodeElimination::isLiveInstr(const MachineInstr *MI) const {
if (MI->mayStore() || MI->isBranch() || MI->isCall() || MI->isReturn())
return true;
if (MI->hasOrderedMemoryRef() || MI->hasUnmodeledSideEffects())
if (MI->hasOrderedMemoryRef() || MI->hasUnmodeledSideEffects() ||
MI->isPosition())
return true;
if (MI->isPHI())
return false;

17
test/CodeGen/Hexagon/rdf-ehlabel-live.mir Normal file
View File

@ -0,0 +1,17 @@
# RUN: llc -march=hexagon -run-pass hexagon-rdf-opt -o - %s | FileCheck %s
# Check that EH_LABELs are not removed as dead (since they are no longer
# marked as having side-effects):
# CHECK-LABEL: fred
# CHECK: EH_LABEL
---
name: fred
tracksRegLiveness: true
body: |
bb.0:
%r0 = A2_tfrsi 0
EH_LABEL 0
...