diff options
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); |