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enhance vmcore to know that udiv's can be exact, and add a trivial

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instcombine xform to exercise this.

Nothing forms exact udivs yet though.  This is progress on PR8862



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124992 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2011-02-06 21:44:57 +00:00
parent bd75021465
commit 35bda8914c
14 changed files with 110 additions and 32 deletions
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7
lib/Bitcode/Writer/BitcodeWriter.cpp
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@@ -470,9 +470,10 @@ static uint64_t GetOptimizationFlags(const Value *V) {
Flags |= 1 << bitc::OBO_NO_SIGNED_WRAP;
if (OBO->hasNoUnsignedWrap())
Flags |= 1 << bitc::OBO_NO_UNSIGNED_WRAP;
} else if (const SDivOperator *Div = dyn_cast<SDivOperator>(V)) {
if (Div->isExact())
Flags |= 1 << bitc::SDIV_EXACT;
} else if (const PossiblyExactOperator *PEO =
dyn_cast<PossiblyExactOperator>(V)) {
if (PEO->isExact())
Flags |= 1 << bitc::PEO_EXACT;
}
return Flags;