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Commit r185909 was a misapplied patch, fix it

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185910 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Majnemer
2013-07-09 07:58:32 +00:00
parent 377a5c1a87
commit 11c29bafd5
3 changed files with 73 additions and 24 deletions
Download Patch File Download Diff File Expand all files Collapse all files
lib/Transforms/InstCombine/InstCombineCompares.cpp
+13 -21
View File
@@ -1564,13 +1564,23 @@ Instruction *InstCombiner::visitICmpInstWithInstAndIntCst(ICmpInst &ICI,
}
}
// X-C1 <u 2 -> (X & -2) == C1
// iff C1 & 1 == 0
// X-C1 <u C2 -> (X & -C2) == C1
// iff C1 & (C2-1) == 0
// C2 is a power of 2
if (ICI.getPredicate() == ICmpInst::ICMP_ULT && LHSI->hasOneUse() &&
LHSV[0] == 0 && RHSV == 2)
RHSV.isPowerOf2() && (LHSV & (RHSV - 1)) == 0)
return new ICmpInst(ICmpInst::ICMP_EQ,
Builder->CreateAnd(LHSI->getOperand(0), -RHSV),
ConstantExpr::getNeg(LHSC));
// X-C1 >u C2 -> (X & ~C2) == C1
// iff C1 & C2 == 0
// C2+1 is a power of 2
if (ICI.getPredicate() == ICmpInst::ICMP_UGT && LHSI->hasOneUse() &&
(RHSV + 1).isPowerOf2() && (LHSV & RHSV) == 0)
return new ICmpInst(ICmpInst::ICMP_NE,
Builder->CreateAnd(LHSI->getOperand(0), ~RHSV),
ConstantExpr::getNeg(LHSC));
}
break;
}
@@ -1732,24 +1742,6 @@ Instruction *InstCombiner::visitICmpInstWithInstAndIntCst(ICmpInst &ICI,
default:
break;
}
// X-C1 <u C2 -> (X & -C2) == C1
// iff C1 & (C2-1) == 0
// C2 is a power of 2
if (ICI.getPredicate() == ICmpInst::ICMP_ULT && LHSI->hasOneUse() &&
RHSV.isPowerOf2() && (LHSV & (RHSV - 1)) == 0)
return new ICmpInst(ICmpInst::ICMP_EQ,
Builder->CreateAnd(LHSI->getOperand(0), -RHSV),
ConstantExpr::getNeg(LHSC));
// X-C1 >u C2 -> (X & ~C2) == C1
// iff C1 & C2 == 0
// C2+1 is a power of 2
if (ICI.getPredicate() == ICmpInst::ICMP_UGT && LHSI->hasOneUse() &&
(RHSV + 1).isPowerOf2() && (LHSV & RHSV) == 0)
return new ICmpInst(ICmpInst::ICMP_NE,
Builder->CreateAnd(LHSI->getOperand(0), ~RHSV),
ConstantExpr::getNeg(LHSC));
}
}
return 0;