6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2024-07-17 20:29:31 +00:00
Code Issues Projects Releases Wiki Activity

Avoid emitting redundant materializations of integer constants

Browse Source 
for things like null pointers, which at this level aren't
different from regular integer constants.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57265 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2008-10-07 22:03:27 +00:00
parent 145b828014
commit 1e9e8c3bd5
1 changed files with 4 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
lib/CodeGen/SelectionDAG/FastISel.cpp
View File

@ -81,7 +81,9 @@ unsigned FastISel::getRegForValue(Value *V) {
} else if (isa<AllocaInst>(V)) {
Reg = TargetMaterializeAlloca(cast<AllocaInst>(V));
} else if (isa<ConstantPointerNull>(V)) {
Reg = FastEmit_i(VT, VT, ISD::Constant, 0);
// Translate this as an integer zero so that it can be
// local-CSE'd with actual integer zeros.
Reg = getRegForValue(Constant::getNullValue(TD.getIntPtrType()));
} else if (ConstantFP *CF = dyn_cast<ConstantFP>(V)) {
Reg = FastEmit_f(VT, VT, ISD::ConstantFP, CF);
@ -95,8 +97,7 @@ unsigned FastISel::getRegForValue(Value *V) {
APFloat::rmTowardZero) != APFloat::opOK) {
APInt IntVal(IntBitWidth, 2, x);
unsigned IntegerReg = FastEmit_i(IntVT.getSimpleVT(), IntVT.getSimpleVT(),
ISD::Constant, IntVal.getZExtValue());
unsigned IntegerReg = getRegForValue(ConstantInt::get(IntVal));
if (IntegerReg != 0)
Reg = FastEmit_r(IntVT.getSimpleVT(), VT, ISD::SINT_TO_FP, IntegerReg);
}