e90c6f5596
Fixes bugs [[ https://bugs.llvm.org/show_bug.cgi?id=50580 | 50580 ]] and [[ https://bugs.llvm.org/show_bug.cgi?id=49446 | 49446 ]] When compiling with -g "DBG_VALUE <reg>" instructions are added in the MIR, if such a instruction is inserted between instructions that use <reg> then MachineCopyPropagation invalidates <reg> , this causes some copies to not be propagated and causes differences in code generation (ex bugs 50580 and 49446 ). DBG_VALUE instructions should be ignored since they don't actually modify the register. Reviewed By: lkail Differential Revision: https://reviews.llvm.org/D104394
21 lines
791 B
YAML
21 lines
791 B
YAML
# RUN: llc -mtriple=i686-- -run-pass machine-cp -verify-machineinstrs -o - %s | FileCheck %s
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---
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# Test that machine copy propagation ignores DBG_VALUE and DBL_VALUE_LIST and updates it.
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# CHECK-LABEL: name: foo
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# CHECK: bb.0:
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# CHECK-NEXT: $rax = MOV64ri 31
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# CHECK-NEXT: DBG_VALUE $rax
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# CHECK-NEXT: DBG_VALUE_LIST 0, !DIExpression(DW_OP_LLVM_arg, 0, DW_OP_LLVM_arg, 1, DW_OP_constu, 4, DW_OP_mul, DW_OP_plus, DW_OP_stack_value), $rax, 0, 0
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# CHECK-NEXT: RETQ implicit killed $rax
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name: foo
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body: |
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bb.0:
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renamable $rcx = MOV64ri 31
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DBG_VALUE $rcx, 0, 0, 0, 0
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DBG_VALUE_LIST 0, !DIExpression(DW_OP_LLVM_arg, 0, DW_OP_LLVM_arg, 1, DW_OP_constu, 4, DW_OP_mul, DW_OP_plus, DW_OP_stack_value), $rcx, 0, 0
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$rax = COPY killed renamable $rcx
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RETQ implicit killed $rax
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...
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