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| author | Evan Cheng <evan.cheng@apple.com> | 2010-05-11 00:20:03 +0000 |
|---|---|---|
| committer | Evan Cheng <evan.cheng@apple.com> | 2010-05-11 00:20:03 +0000 |
| commit | 31b9c44cc13bb686010cf6bfbeef8745c39939b9 (patch) | |
| tree | e324cbea83348dae5ffa8c6f1915855ec7ec14d1 /lib/CodeGen/VirtRegRewriter.cpp | |
| parent | 0bcccac50481921ab86dfdbaadec79f1db35c662 (diff) | |
| download | llvm-31b9c44cc13bb686010cf6bfbeef8745c39939b9.tar.gz llvm-31b9c44cc13bb686010cf6bfbeef8745c39939b9.tar.bz2 llvm-31b9c44cc13bb686010cf6bfbeef8745c39939b9.tar.xz | |
It's not safe eliminate copies where src and dst have different sub-register indices.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103450 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/VirtRegRewriter.cpp')
| -rw-r--r-- | lib/CodeGen/VirtRegRewriter.cpp | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/lib/CodeGen/VirtRegRewriter.cpp b/lib/CodeGen/VirtRegRewriter.cpp index 9b46273455..9c3248067a 100644 --- a/lib/CodeGen/VirtRegRewriter.cpp +++ b/lib/CodeGen/VirtRegRewriter.cpp @@ -2425,7 +2425,8 @@ LocalRewriter::RewriteMBB(LiveIntervals *LIs, // eliminate this or else the undef marker is lost and it will // confuses the scavenger. This is extremely rare. unsigned Src, Dst, SrcSR, DstSR; - if (TII->isMoveInstr(MI, Src, Dst, SrcSR, DstSR) && Src == Dst && + if (TII->isMoveInstr(MI, Src, Dst, SrcSR, DstSR) && + Src == Dst && SrcSR == DstSR && !MI.findRegisterUseOperand(Src)->isUndef()) { ++NumDCE; DEBUG(dbgs() << "Removing now-noop copy: " << MI); @@ -2514,7 +2515,8 @@ LocalRewriter::RewriteMBB(LiveIntervals *LIs, // instruction before considering the dest reg to be changed. { unsigned Src, Dst, SrcSR, DstSR; - if (TII->isMoveInstr(MI, Src, Dst, SrcSR, DstSR) && Src == Dst) { + if (TII->isMoveInstr(MI, Src, Dst, SrcSR, DstSR) && + Src == Dst && SrcSR == DstSR) { ++NumDCE; DEBUG(dbgs() << "Removing now-noop copy: " << MI); InvalidateKills(MI, TRI, RegKills, KillOps); |