6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-01-01 00:33:09 +00:00
Code Issues Projects Releases Wiki Activity

We can only fold a load into an op if there is exactly one use of the value.

Browse Source 
Checking to see if the load has two uses is not equivalent, as the chain
value may have zero uses.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19518 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-01-12 18:38:26 +00:00
parent 5c88456227
commit a0bb692b27
1 changed files with 2 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
lib/Target/X86/X86ISelPattern.cpp
View File

@ -979,7 +979,8 @@ bool ISel::isFoldableLoad(SDOperand Op) {
// If this load has already been emitted, we clearly can't fold it.
if (ExprMap.count(Op)) return false;
return Op.Val->use_size() == 2;
// Finally, there can only be one use of its value.
return Op.Val->hasNUsesOfValue(1, 0);
}
/// EmitFoldedLoad - Ensure that the arguments of the load are code generated,