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| author | Johannes Doerfert <johannes@jdoerfert.de> | 2020-01-12 00:18:07 -0600 |
|---|---|---|
| committer | Johannes Doerfert <johannes@jdoerfert.de> | 2020-01-23 18:13:52 -0600 |
| commit | 2baf000ecc06209c70e46e19cf947a8f77cf0cad (patch) | |
| tree | 2528427dc62e25906211900f8af611411eccde11 /llvm/lib/Transforms | |
| parent | 30ae859c696748e1314788367226e4c65669f526 (diff) | |
| download | llvm-2baf000ecc06209c70e46e19cf947a8f77cf0cad.zip llvm-2baf000ecc06209c70e46e19cf947a8f77cf0cad.tar.gz llvm-2baf000ecc06209c70e46e19cf947a8f77cf0cad.tar.bz2 | |
[Attributor] `byval` arguments are always `noalias`
`byval` introduces a local copy of the argument. That copy cannot alias
anything.
Diffstat (limited to 'llvm/lib/Transforms')
| -rw-r--r-- | llvm/lib/Transforms/IPO/Attributor.cpp | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/llvm/lib/Transforms/IPO/Attributor.cpp b/llvm/lib/Transforms/IPO/Attributor.cpp index 5eb21a0..19dc998 100644 --- a/llvm/lib/Transforms/IPO/Attributor.cpp +++ b/llvm/lib/Transforms/IPO/Attributor.cpp @@ -2386,6 +2386,14 @@ struct AANoAliasArgument final using Base = AAArgumentFromCallSiteArguments<AANoAlias, AANoAliasImpl>; AANoAliasArgument(const IRPosition &IRP) : Base(IRP) {} + /// See AbstractAttribute::initialize(...). + void initialize(Attributor &A) override { + Base::initialize(A); + // See callsite argument attribute and callee argument attribute. + if (hasAttr({Attribute::ByVal})) + indicateOptimisticFixpoint(); + } + /// See AbstractAttribute::update(...). ChangeStatus updateImpl(Attributor &A) override { // We have to make sure no-alias on the argument does not break |