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| author | Simon Pilgrim <llvm-dev@redking.me.uk> | 2018-11-14 15:04:08 +0000 |
|---|---|---|
| committer | Simon Pilgrim <llvm-dev@redking.me.uk> | 2018-11-14 15:04:08 +0000 |
| commit | 2b166c504428cdbd0250e827c3af41f1945c79ab (patch) | |
| tree | 936ad86fe7972388bb8b1ce8915531f5008ea58e /llvm/lib/Analysis | |
| parent | 07e93c57a3e5cf0ae32f7ed08fcc04ccb4ce82d5 (diff) | |
| download | bcm5719-llvm-2b166c504428cdbd0250e827c3af41f1945c79ab.tar.gz bcm5719-llvm-2b166c504428cdbd0250e827c3af41f1945c79ab.zip | |
[TTI] getOperandInfo - a broadcast shuffle means the result is OK_UniformValue
llvm-svn: 346868
Diffstat (limited to 'llvm/lib/Analysis')
| -rw-r--r-- | llvm/lib/Analysis/TargetTransformInfo.cpp | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/llvm/lib/Analysis/TargetTransformInfo.cpp b/llvm/lib/Analysis/TargetTransformInfo.cpp index 25ebcdec3be..79fe6dc7d87 100644 --- a/llvm/lib/Analysis/TargetTransformInfo.cpp +++ b/llvm/lib/Analysis/TargetTransformInfo.cpp @@ -399,6 +399,13 @@ TargetTransformInfo::getOperandInfo(Value *V, OperandValueProperties &OpProps) { return OK_UniformConstantValue; } + // A broadcast shuffle creates a uniform value. + // TODO: Add support for non-zero index broadcasts. + // TODO: Add support for different source vector width. + if (auto *ShuffleInst = dyn_cast<ShuffleVectorInst>(V)) + if (ShuffleInst->isZeroEltSplat()) + OpInfo = OK_UniformValue; + const Value *Splat = getSplatValue(V); // Check for a splat of a constant or for a non uniform vector of constants |
