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Rename isPowerOfTwo to isKnownToBeAPowerOfTwo.

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In a previous thread it was pointed out that isPowerOfTwo is not a very precise
name since it can return false for powers of two if it is unable to show that
they are powers of two.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@170093 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola
2012-12-13 03:37:24 +00:00
parent ed185daba7
commit dbaa2376f7
4 changed files with 21 additions and 21 deletions
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4
lib/Transforms/InstCombine/InstCombineMulDivRem.cpp
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@@ -37,7 +37,7 @@ static Value *simplifyValueKnownNonZero(Value *V, InstCombiner &IC) {
if (match(V, m_LShr(m_OneUse(m_Shl(m_Value(PowerOf2), m_Value(A))),
m_Value(B))) &&
// The "1" can be any value known to be a power of 2.
isPowerOfTwo(PowerOf2)) {
isKnownToBeAPowerOfTwo(PowerOf2)) {
A = IC.Builder->CreateSub(A, B);
return IC.Builder->CreateShl(PowerOf2, A);
}
@@ -45,7 +45,7 @@ static Value *simplifyValueKnownNonZero(Value *V, InstCombiner &IC) {
// (PowerOfTwo >>u B) --> isExact since shifting out the result would make it
// inexact. Similarly for <<.
if (BinaryOperator *I = dyn_cast<BinaryOperator>(V))
if (I->isLogicalShift() && isPowerOfTwo(I->getOperand(0))) {
if (I->isLogicalShift() && isKnownToBeAPowerOfTwo(I->getOperand(0))) {
// We know that this is an exact/nuw shift and that the input is a
// non-zero context as well.
if (Value *V2 = simplifyValueKnownNonZero(I->getOperand(0), IC)) {