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author | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2013-07-01 23:19:39 +0000 |
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committer | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2013-07-01 23:19:39 +0000 |
commit | 74d2a3e1a014b93e9037a7b04e85dc92bfb54fa7 (patch) | |
tree | 4f02bba5c303c60c83a17659cd196e2ec8f9f8eb /include | |
parent | a785a7bf51726d3fbfb907beb3112eed6b850a3c (diff) | |
download | external_llvm-74d2a3e1a014b93e9037a7b04e85dc92bfb54fa7.zip external_llvm-74d2a3e1a014b93e9037a7b04e85dc92bfb54fa7.tar.gz external_llvm-74d2a3e1a014b93e9037a7b04e85dc92bfb54fa7.tar.bz2 |
Remove floating point computations form SpillPlacement.cpp.
Patch by Benjamin Kramer!
Use the BlockFrequency class instead of floats in the Hopfield network
computations. This rescales the node Bias field from a [-2;2] float
range to two block frequencies BiasN and BiasP pulling in opposite
directions. This construct has a more predictable behavior when block
frequencies saturate.
The per-node scaling factors are no longer necessary, assuming the block
frequencies around a bundle are consistent.
This patch can cause the register allocator to make different spilling
decisions. The differences should be small.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185393 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'include')
-rw-r--r-- | include/llvm/Support/BlockFrequency.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/llvm/Support/BlockFrequency.h b/include/llvm/Support/BlockFrequency.h index 147d52a..624d6de 100644 --- a/include/llvm/Support/BlockFrequency.h +++ b/include/llvm/Support/BlockFrequency.h @@ -36,6 +36,9 @@ public: /// \brief Returns the frequency of the entry block of the function. static uint64_t getEntryFrequency() { return ENTRY_FREQ; } + /// \brief Returns the maximum possible prequency, the saturation value. + static uint64_t getMaxFrequency() { return -1ULL; } + /// \brief Returns the frequency as a fixpoint number scaled by the entry /// frequency. uint64_t getFrequency() const { return Frequency; } |