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When the instruction has imm form and fed by LI, we can remove the redundat LI instruction.
Below is an example:
```
renamable $x5 = LI8 2
renamable $x4 = exact SRD killed renamable $x4, killed renamable $r5, implicit $x5
```
will be converted to:
```
renamable $x5 = LI8 2
renamable $x4 = exact RLDICL killed renamable $x4, 62, 2, implicit killed $x5
```
But when we do this optimization, we forget to remove implicit killed $x5
This bug has caused a lnt case error. This patch is to fix above bug.
Reviewed By: #powerpc, shchenz
Differential Revision: https://reviews.llvm.org/D85288
23 lines
723 B
YAML
23 lines
723 B
YAML
# RUN: llc -mtriple=powerpc64-unknown-unknown -stop-after ppc-pre-emit-peephole \
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# RUN: %s -o - -verify-machineinstrs | FileCheck %s
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---
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name: testRedundantLiImplicitReg
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tracksRegLiveness: true
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body: |
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bb.0.entry:
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liveins: $x3, $x4, $x5
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STW killed $r3, killed $x5, 100
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renamable $x5 = LI8 2
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renamable $x4 = exact SRD killed renamable $x4, killed renamable $r5, implicit $x5
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STD $x4, $x4, 100
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BLR8 implicit $lr8, implicit $rm
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; CHECK-LABEL: testRedundantLiImplicitReg
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; CHECK: bb.0.entry:
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; CHECK: STW killed $r3, killed $x5, 100
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; CHECK: renamable $x4 = exact RLDICL killed renamable $x4, 62, 2
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; CHECK: STD killed $x4, $x4, 100
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; CHECK: BLR8 implicit $lr8, implicit $rm
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