diff options
Diffstat (limited to 'llvm/lib/CodeGen')
| -rw-r--r-- | llvm/lib/CodeGen/PeepholeOptimizer.cpp | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/llvm/lib/CodeGen/PeepholeOptimizer.cpp b/llvm/lib/CodeGen/PeepholeOptimizer.cpp index ae14331d663..98fcc2e2529 100644 --- a/llvm/lib/CodeGen/PeepholeOptimizer.cpp +++ b/llvm/lib/CodeGen/PeepholeOptimizer.cpp @@ -899,7 +899,11 @@ bool PeepholeOptimizer::optimizeCoalescableCopy(MachineInstr *MI) { if (!findNextSource(NewSrc, NewSubReg) || SrcReg == NewSrc) continue; // Rewrite source. - Changed |= CpyRewriter->RewriteCurrentSource(NewSrc, NewSubReg); + if (CpyRewriter->RewriteCurrentSource(NewSrc, NewSubReg)) { + // We may have extended the live-range of NewSrc, account for that. + MRI->clearKillFlags(NewSrc); + Changed = true; + } } // TODO: We could have a clean-up method to tidy the instruction. // E.g., v0 = INSERT_SUBREG v1, v1.sub0, sub0 |
