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Phi nodes always use an even number of operands, so don't ever allocate

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an odd number.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129270 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jay Foad 2011-04-11 09:25:51 +00:00
parent ee69926b10
commit 4e9b0e3587
1 changed files with 2 additions and 1 deletions
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3
lib/VMCore/Instructions.cpp
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@ -137,7 +137,8 @@ Value *PHINode::removeIncomingValue(unsigned Idx, bool DeletePHIIfEmpty) {
///
void PHINode::growOperands() {
unsigned e = getNumOperands();
unsigned NumOps = e*3/2;
// Multiply by 1.5 and round down so the result is still even.
unsigned NumOps = e + e / 4 * 2;
if (NumOps < 4) NumOps = 4; // 4 op PHI nodes are VERY common.
ReservedSpace = NumOps;