6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-07-24 22:24:54 +00:00
Code Issues Projects Releases Wiki Activity

MemCpyOpt: When merging memsets also merge the trivial case of two memsets with the same destination.

Browse Source 
The testcase is from PR19092, but I think the bug described there is actually a clang issue.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@203489 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer
2014-03-10 21:05:13 +00:00
parent d89b0f200c
commit 8da0b7358d
2 changed files with 19 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
lib/Transforms/Scalar/MemCpyOptimizer.cpp
View File

@@ -75,6 +75,13 @@ static bool IsPointerOffset(Value *Ptr1, Value *Ptr2, int64_t &Offset,
const DataLayout &TD) {
Ptr1 = Ptr1->stripPointerCasts();
Ptr2 = Ptr2->stripPointerCasts();
// Handle the trivial case first.
if (Ptr1 == Ptr2) {
Offset = 0;
return true;
}
GEPOperator *GEP1 = dyn_cast<GEPOperator>(Ptr1);
GEPOperator *GEP2 = dyn_cast<GEPOperator>(Ptr2);