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Eliminate trivial redundant loads across nocapture+readonly calls to uncaptured

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pointer arguments.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185776 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky
2013-07-07 10:15:16 +00:00
parent 6bd46a40e8
commit 37ade2b801
2 changed files with 28 additions and 4 deletions
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lib/Analysis/AliasAnalysis.cpp
+11 -4
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@@ -450,6 +450,7 @@ AliasAnalysis::callCapturesBefore(const Instruction *I,
return AliasAnalysis::ModRef;
unsigned ArgNo = 0;
AliasAnalysis::ModRefResult R = AliasAnalysis::NoModRef;
for (ImmutableCallSite::arg_iterator CI = CS.arg_begin(), CE = CS.arg_end();
CI != CE; ++CI, ++ArgNo) {
// Only look at the no-capture or byval pointer arguments. If this
@@ -463,12 +464,18 @@ AliasAnalysis::callCapturesBefore(const Instruction *I,
// is impossible to alias the pointer we're checking. If not, we have to
// assume that the call could touch the pointer, even though it doesn't
// escape.
if (!isNoAlias(AliasAnalysis::Location(*CI),
AliasAnalysis::Location(Object))) {
return AliasAnalysis::ModRef;
if (isNoAlias(AliasAnalysis::Location(*CI),
AliasAnalysis::Location(Object)))
continue;
if (CS.doesNotAccessMemory(ArgNo))
continue;
if (CS.onlyReadsMemory(ArgNo)) {
R = AliasAnalysis::Ref;
continue;
}
return AliasAnalysis::ModRef;
}
return AliasAnalysis::NoModRef;
return R;
}
// AliasAnalysis destructor: DO NOT move this to the header file for