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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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lib/Bitcode/Reader/BitcodeReader.cpp
+6 -4
View File
@@ -1090,8 +1090,9 @@ bool BitcodeReader::ParseConstants() {
Flags |= OverflowingBinaryOperator::NoSignedWrap;
if (Record[3] & (1 << bitc::OBO_NO_UNSIGNED_WRAP))
Flags |= OverflowingBinaryOperator::NoUnsignedWrap;
} else if (Opc == Instruction::SDiv) {
if (Record[3] & (1 << bitc::SDIV_EXACT))
} else if (Opc == Instruction::SDiv ||
Opc == Instruction::UDiv) {
if (Record[3] & (1 << bitc::PEO_EXACT))
Flags |= SDivOperator::IsExact;
}
}
@@ -1905,8 +1906,9 @@ bool BitcodeReader::ParseFunctionBody(Function *F) {
cast<BinaryOperator>(I)->setHasNoSignedWrap(true);
if (Record[OpNum] & (1 << bitc::OBO_NO_UNSIGNED_WRAP))
cast<BinaryOperator>(I)->setHasNoUnsignedWrap(true);
} else if (Opc == Instruction::SDiv) {
if (Record[OpNum] & (1 << bitc::SDIV_EXACT))
} else if (Opc == Instruction::SDiv ||
Opc == Instruction::UDiv) {
if (Record[OpNum] & (1 << bitc::PEO_EXACT))
cast<BinaryOperator>(I)->setIsExact(true);
}
}
lib/Bitcode/Writer/BitcodeWriter.cpp
+4 -3
View File
@@ -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;