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The patch fixes PR35131

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Summary:

Fix a misprint which led to false CTLZ recognition.

Reviewers: craig.topper

Differential Revision: https://reviews.llvm.org/D39585

From: Evgeny Stupachenko <evstupac@gmail.com>
llvm-svn: 317348
This commit is contained in:
Evgeny Stupachenko 2017-11-03 18:50:03 +00:00
parent c73ea76868
commit 7b8d0094ba
1 changed files with 3 additions and 3 deletions
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6
lib/Transforms/Scalar/LoopIdiomRecognize.cpp
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@ -1326,9 +1326,9 @@ static bool detectCTLZIdiom(Loop *CurLoop, PHINode *&PhiX,
// step 2: detect instructions corresponding to "x.next = x >> 1"
if (!DefX || DefX->getOpcode() != Instruction::AShr)
return false;
if (ConstantInt *Shft = dyn_cast<ConstantInt>(DefX->getOperand(1)))
if (!Shft || !Shft->isOne())
return false;
ConstantInt *Shft = dyn_cast<ConstantInt>(DefX->getOperand(1));
if (!Shft || !Shft->isOne())
return false;
VarX = DefX->getOperand(0);
// step 3: Check the recurrence of variable X