6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2024-08-23 17:29:19 +00:00
Code Issues Projects Releases Wiki Activity

InstCombine: factor code better.

Browse Source 
No functionality change.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158301 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer 2012-06-11 08:01:25 +00:00
parent 66821d9020
commit 7a99b467df
1 changed files with 7 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
lib/Transforms/InstCombine/InstCombineCompares.cpp
View File

@ -2581,21 +2581,14 @@ Instruction *InstCombiner::visitICmpInst(ICmpInst &I) {
}
// Transform (zext A) == (B & (1<<X)-1) --> A == (trunc B)
// and (B & (1<<X)-1) == (zext A) --> A == (trunc B)
ConstantInt *Cst1;
if (Op0->hasOneUse() &&
match(Op0, m_ZExt(m_Value(A))) &&
match(Op1, m_And(m_Value(B), m_ConstantInt(Cst1)))) {
APInt Pow2 = Cst1->getValue() + 1;
if (Pow2.isPowerOf2() && isa<IntegerType>(A->getType()) &&
Pow2.logBase2() == cast<IntegerType>(A->getType())->getBitWidth())
return new ICmpInst(I.getPredicate(), A,
Builder->CreateTrunc(B, A->getType()));
}
// Transform (B & (1<<X)-1) == (zext A) --> A == (trunc B)
if (Op1->hasOneUse() &&
match(Op0, m_And(m_Value(B), m_ConstantInt(Cst1))) &&
match(Op1, m_ZExt(m_Value(A)))) {
if ((Op0->hasOneUse() &&
match(Op0, m_ZExt(m_Value(A))) &&
match(Op1, m_And(m_Value(B), m_ConstantInt(Cst1)))) ||
(Op1->hasOneUse() &&
match(Op0, m_And(m_Value(B), m_ConstantInt(Cst1))) &&
match(Op1, m_ZExt(m_Value(A))))) {
APInt Pow2 = Cst1->getValue() + 1;
if (Pow2.isPowerOf2() && isa<IntegerType>(A->getType()) &&
Pow2.logBase2() == cast<IntegerType>(A->getType())->getBitWidth())