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| author | Bob Wilson <bob.wilson@apple.com> | 2010-02-12 01:30:21 +0000 |
|---|---|---|
| committer | Bob Wilson <bob.wilson@apple.com> | 2010-02-12 01:30:21 +0000 |
| commit | fe61fb1e1082c81653ed78efd6d471592a2e57ad (patch) | |
| tree | df0bb339b5cb79a8d22e66430b920e47fae100a5 /lib/CodeGen/CMakeLists.txt | |
| parent | ccfa1db5380fd3089fc68f3ed9ccfe6a41d7a309 (diff) | |
| download | llvm-fe61fb1e1082c81653ed78efd6d471592a2e57ad.tar.gz llvm-fe61fb1e1082c81653ed78efd6d471592a2e57ad.tar.bz2 llvm-fe61fb1e1082c81653ed78efd6d471592a2e57ad.tar.xz | |
Add a new pass on machine instructions to optimize away PHI cycles that
reduce down to a single value. InstCombine already does this transformation
but DAG legalization may introduce new opportunities. This has turned out to
be important for ARM where 64-bit values are split up during type legalization:
InstCombine is not able to remove the PHI cycles on the 64-bit values but
the separate 32-bit values can be optimized. I measured the compile time
impact of this (running llc on 176.gcc) and it was not significant.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95951 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/CMakeLists.txt')
| -rw-r--r-- | lib/CodeGen/CMakeLists.txt | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/CodeGen/CMakeLists.txt b/lib/CodeGen/CMakeLists.txt index 9fcbea9437..46d3268259 100644 --- a/lib/CodeGen/CMakeLists.txt +++ b/lib/CodeGen/CMakeLists.txt @@ -39,6 +39,7 @@ add_llvm_library(LLVMCodeGen ObjectCodeEmitter.cpp OcamlGC.cpp OptimizeExts.cpp + OptimizePHIs.cpp PHIElimination.cpp Passes.cpp PostRASchedulerList.cpp |