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| author | Hongtao Yu <hoy@fb.com> | 2021-04-12 23:51:44 -0700 |
|---|---|---|
| committer | Hongtao Yu <hoy@fb.com> | 2021-04-19 17:55:35 -0700 |
| commit | b98807df05cb4cd728e744c3349a9dfd341f6f61 (patch) | |
| tree | 7288dd26f041df9f156887793a1bcb301c4c4d3f /llvm/lib/CodeGen/RegisterScavenging.cpp | |
| parent | 1812319292e0041e7e32ad7b61d7252a450b95c2 (diff) | |
| download | llvm-b98807df05cb4cd728e744c3349a9dfd341f6f61.zip llvm-b98807df05cb4cd728e744c3349a9dfd341f6f61.tar.gz llvm-b98807df05cb4cd728e744c3349a9dfd341f6f61.tar.bz2 | |
[CSSPGO] Exclude pseudo probes from slot index
Pseudo probe are currently given a slot index like other regular instructions. This affects register pressure and lifetime weight computation because of enlarged lifetime length with pseudo probe instructions. As a consequence, program could get different code generated w/ and w/o pseudo probes. I'm closing the gap by excluding pseudo probes from stack index and downstream register allocation related passes.
Reviewed By: wmi
Differential Revision: https://reviews.llvm.org/D100334
Diffstat (limited to 'llvm/lib/CodeGen/RegisterScavenging.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/RegisterScavenging.cpp | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/llvm/lib/CodeGen/RegisterScavenging.cpp b/llvm/lib/CodeGen/RegisterScavenging.cpp index 2ec4915..e35cf7aa 100644 --- a/llvm/lib/CodeGen/RegisterScavenging.cpp +++ b/llvm/lib/CodeGen/RegisterScavenging.cpp @@ -175,7 +175,7 @@ void RegScavenger::forward() { I.Restore = nullptr; } - if (MI.isDebugInstr()) + if (MI.isDebugOrPseudoInstr()) return; determineKillsAndDefs(); @@ -298,7 +298,7 @@ Register RegScavenger::findSurvivorReg(MachineBasicBlock::iterator StartMI, bool inVirtLiveRange = false; for (++MI; InstrLimit > 0 && MI != ME; ++MI, --InstrLimit) { - if (MI->isDebugInstr()) { + if (MI->isDebugOrPseudoInstr()) { ++InstrLimit; // Don't count debug instructions continue; } |