[PGO] Profile guided code size optimization.
Summary:
Enable some of the existing size optimizations for cold code under PGO.
A ~5% code size saving in big internal app under PGO.
The way it gets BFI/PSI is discussed in the RFC thread
http://lists.llvm.org/pipermail/llvm-dev/2019-March/130894.html
Note it doesn't currently touch loop passes.
Reviewers: davidxl, eraman
Reviewed By: eraman
Subscribers: mgorny, javed.absar, smeenai, mehdi_amini, eraman, zzheng, steven_wu, dexonsmith, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D59514
llvm-svn: 358422
diff --git a/llvm/lib/Transforms/Scalar/LoopUnrollAndJamPass.cpp b/llvm/lib/Transforms/Scalar/LoopUnrollAndJamPass.cpp
index 71e9953..86891eb 100644
--- a/llvm/lib/Transforms/Scalar/LoopUnrollAndJamPass.cpp
+++ b/llvm/lib/Transforms/Scalar/LoopUnrollAndJamPass.cpp
@@ -294,7 +294,8 @@
return LoopUnrollResult::Unmodified;
TargetTransformInfo::UnrollingPreferences UP = gatherUnrollingPreferences(
- L, SE, TTI, OptLevel, None, None, None, None, None, None);
+ L, SE, TTI, nullptr, nullptr, OptLevel,
+ None, None, None, None, None, None);
if (AllowUnrollAndJam.getNumOccurrences() > 0)
UP.UnrollAndJam = AllowUnrollAndJam;
if (UnrollAndJamThreshold.getNumOccurrences() > 0)