RPCS3/llvm-mirror
1
0
Fork 0
mirror of https://github.com/RPCS3/llvm-mirror.git synced 2025-02-27 15:57:30 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

[InstCombine] add FIXME comment to shuffle transform; NFC

Browse Source 
Existing tests:
rG5d04e008f708
rG2a191cf8500f
...should verify that the underlying analysis doesn't improve
too much without updating this user code.
This commit is contained in:
Sanjay Patel 2020-02-04 12:59:23 -05:00
parent 0e9ab3b9f6
commit 06f90b77ee
1 changed files with 3 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
lib/Transforms/InstCombine/InstructionCombining.cpp
View File

@ -1701,6 +1701,9 @@ Instruction *InstCombiner::foldVectorBinop(BinaryOperator &Inst) {
BO->getOpcode() != Opcode)
return nullptr;
// FIXME: This may not be safe if the analysis allows undef elements. By
// moving 'Y' before the splat shuffle, we are implicitly assuming
// that it is not undef/poison at the splat index.
Value *Y, *OtherOp;
if (isSplatValue(BO->getOperand(0), SplatIndex->getZExtValue())) {
Y = BO->getOperand(0);