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140d944d08
It is legal to merge instructions with different undef flags; However we must drop the undef flag from the merged instruction if it isn't present everywhere. This fixes http://llvm.org/PR30199 llvm-svn: 281957
30 lines
584 B
YAML
30 lines
584 B
YAML
# RUN: llc -o - %s -march=x86 -run-pass branch-folder | FileCheck %s
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# Test that tail merging drops undef flags that aren't present on all
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# instructions to be merged.
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--- |
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define void @func() { ret void }
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...
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---
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# CHECK-LABEL: name: func
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# CHECK: bb.1:
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# CHECK: %eax = MOV32ri 2
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# CHECK-NOT: RET
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# CHECK: bb.2:
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# CHECK-NOT: RET 0, undef %eax
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# CHECK: RET 0, %eax
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name: func
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tracksRegLiveness: true
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body: |
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bb.0:
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successors: %bb.1, %bb.2
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JE_1 %bb.1, implicit undef %eflags
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JMP_1 %bb.2
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bb.1:
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%eax = MOV32ri 2
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RET 0, %eax
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bb.2:
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RET 0, undef %eax
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...
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