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| author | Hal Finkel <hfinkel@anl.gov> | 2014-03-31 23:23:51 +0000 |
|---|---|---|
| committer | Hal Finkel <hfinkel@anl.gov> | 2014-03-31 23:23:51 +0000 |
| commit | 6bbb01bbf8d546afb2810f382d47b1db5213ff42 (patch) | |
| tree | 91e417f2b46036fad0851768f66f1fe0e604d106 /test/Transforms/LoopVectorize | |
| parent | 302173470093455c002d5109dae4710f2de70574 (diff) | |
| download | llvm-6bbb01bbf8d546afb2810f382d47b1db5213ff42.tar.gz llvm-6bbb01bbf8d546afb2810f382d47b1db5213ff42.tar.bz2 llvm-6bbb01bbf8d546afb2810f382d47b1db5213ff42.tar.xz | |
Move partial/runtime unrolling late in the pipeline
The generic (concatenation) loop unroller is currently placed early in the
standard optimization pipeline. This is a good place to perform full unrolling,
but not the right place to perform partial/runtime unrolling. However, most
targets don't enable partial/runtime unrolling, so this never mattered.
However, even some x86 cores benefit from partial/runtime unrolling of very
small loops, and follow-up commits will enable this. First, we need to move
partial/runtime unrolling late in the optimization pipeline (importantly, this
is after SLP and loop vectorization, as vectorization can drastically change
the size of a loop), while keeping the full unrolling where it is now. This
change does just that.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@205264 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/Transforms/LoopVectorize')
| -rw-r--r-- | test/Transforms/LoopVectorize/X86/already-vectorized.ll | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/test/Transforms/LoopVectorize/X86/already-vectorized.ll b/test/Transforms/LoopVectorize/X86/already-vectorized.ll index 885418c0fd..faed77d66d 100644 --- a/test/Transforms/LoopVectorize/X86/already-vectorized.ll +++ b/test/Transforms/LoopVectorize/X86/already-vectorized.ll @@ -1,4 +1,4 @@ -; RUN: opt < %s -debug-only=loop-vectorize -O3 -S 2>&1 | FileCheck %s +; RUN: opt < %s -disable-loop-unrolling -debug-only=loop-vectorize -O3 -S 2>&1 | FileCheck %s ; REQUIRES: asserts ; We want to make sure that we don't even try to vectorize loops again ; The vectorizer used to mark the un-vectorized loop only as already vectorized |