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[BasicAA] Update comments based on feedback from hfinkel. NFCI.

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Original change Hal's comments were based on:
http://reviews.llvm.org/D19730

llvm-svn: 269678
This commit is contained in:
Geoff Berry 2016-05-16 18:51:54 +00:00
parent b5c920f753
commit 21d8cd18c1
1 changed files with 4 additions and 1 deletions
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5
lib/Analysis/BasicAliasAnalysis.cpp
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@ -570,6 +570,9 @@ FunctionModRefBehavior BasicAAResult::getModRefBehavior(ImmutableCallSite CS) {
/// Returns the behavior when calling the given function. For use when the call
/// site is not known.
/// NOTE: Because of the special case handling of llvm.assume below, the result
/// of this function may not match similar results derived from function
/// attributes (e.g. "readnone").
FunctionModRefBehavior BasicAAResult::getModRefBehavior(const Function *F) {
// If the function declares it doesn't access memory, we can't do better.
if (F->doesNotAccessMemory())
@ -577,7 +580,7 @@ FunctionModRefBehavior BasicAAResult::getModRefBehavior(const Function *F) {
// While the assume intrinsic is marked as arbitrarily writing so that
// proper control dependencies will be maintained, it never aliases any
// particular memory location.
// actual memory locations.
if (F->getIntrinsicID() == Intrinsic::assume)
return FMRB_DoesNotAccessMemory;