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| author | Andrew Trick <atrick@apple.com> | 2013-10-15 03:39:43 +0000 |
|---|---|---|
| committer | Andrew Trick <atrick@apple.com> | 2013-10-15 03:39:43 +0000 |
| commit | 51dee24ca6ba63cf021d56ca9cbae62c739d5041 (patch) | |
| tree | 5ee39c0ca82e1099827441eada176b62d50a8e35 /lib/CodeGen/ExecutionDepsFix.cpp | |
| parent | cc3d76d98259ef82c9592022cb0e31fb42b36ab6 (diff) | |
| download | llvm-51dee24ca6ba63cf021d56ca9cbae62c739d5041.tar.gz llvm-51dee24ca6ba63cf021d56ca9cbae62c739d5041.tar.bz2 llvm-51dee24ca6ba63cf021d56ca9cbae62c739d5041.tar.xz | |
Improve on r192635, ExeDepsFix for avx, and add a test case.
rdar:15221834 False AVX register dependencies cause 5x slowdown on
flops-5/6 and significant slowdown on several others.
This was blocking the switch to MI-Sched.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192669 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/ExecutionDepsFix.cpp')
| -rw-r--r-- | lib/CodeGen/ExecutionDepsFix.cpp | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/lib/CodeGen/ExecutionDepsFix.cpp b/lib/CodeGen/ExecutionDepsFix.cpp index 0d26f9d4cb..031f19c135 100644 --- a/lib/CodeGen/ExecutionDepsFix.cpp +++ b/lib/CodeGen/ExecutionDepsFix.cpp @@ -557,6 +557,9 @@ void ExeDepsFix::processUndefReads(MachineBasicBlock *MBB) { for (MachineBasicBlock::reverse_iterator I = MBB->rbegin(), E = MBB->rend(); I != E; ++I) { + // Update liveness, including the current instrucion's defs. + LiveUnits.stepBackward(*I, *TRI); + if (UndefMI == &*I) { if (!LiveUnits.contains(UndefMI->getOperand(OpIdx).getReg(), *TRI)) TII->breakPartialRegDependency(UndefMI, OpIdx, TRI); @@ -568,7 +571,6 @@ void ExeDepsFix::processUndefReads(MachineBasicBlock *MBB) { UndefMI = UndefReads.back().first; OpIdx = UndefReads.back().second; } - LiveUnits.stepBackward(*I, *TRI); } } |