RPCS3/llvm
1
0
Fork 0
mirror of https://github.com/RPCS3/llvm.git synced 2025-01-05 19:29:54 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

[InstCombine] use m_Neg() to reduce code; NFCI

Browse Source 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@315762 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Sanjay Patel 2017-10-13 21:28:50 +00:00
parent 94aa10e94b
commit bfa0442391
1 changed files with 9 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
lib/Transforms/InstCombine/InstCombineAddSub.cpp
View File

@ -1098,22 +1098,19 @@ Instruction *InstCombiner::visitAdd(BinaryOperator &I) {
return Shl;
}
// -A + B --> B - A
// -A + -B --> -(A + B)
if (Value *LHSV = dyn_castNegVal(LHS)) {
if (!isa<Constant>(RHS))
if (Value *RHSV = dyn_castNegVal(RHS)) {
Value *NewAdd = Builder.CreateAdd(LHSV, RHSV, "sum");
return BinaryOperator::CreateNeg(NewAdd);
}
Value *A, *B;
if (match(LHS, m_Neg(m_Value(A)))) {
// -A + -B --> -(A + B)
if (match(RHS, m_Neg(m_Value(B))))
return BinaryOperator::CreateNeg(Builder.CreateAdd(A, B));
return BinaryOperator::CreateSub(RHS, LHSV);
// -A + B --> B - A
return BinaryOperator::CreateSub(RHS, A);
}
// A + -B --> A - B
if (!isa<Constant>(RHS))
if (Value *V = dyn_castNegVal(RHS))
return BinaryOperator::CreateSub(LHS, V);
if (match(RHS, m_Neg(m_Value(B))))
return BinaryOperator::CreateSub(LHS, B);
if (Value *V = checkForNegativeOperand(I, Builder))
return replaceInstUsesWith(I, V);
@ -1247,7 +1244,6 @@ Instruction *InstCombiner::visitAdd(BinaryOperator &I) {
}
}
Value *A, *B;
// (add (xor A, B) (and A, B)) --> (or A, B)
if (match(LHS, m_Xor(m_Value(A), m_Value(B))) &&
match(RHS, m_c_And(m_Specific(A), m_Specific(B))))