mirror of
https://github.com/RPCS3/llvm.git
synced 2026-07-20 19:04:10 -04:00
Sanjay Patel
4b3ebe8332
If we have: R = sub X, Y P = cmp Y, X ...then flipping the operands in the compare instruction can allow using a subtract that sets compare flags. Motivated by diffs in D58875 - not sure if this changes anything there, but this seems like a good thing independent of that. There's a more involved version of this transform already in IR (in instcombine although that seems misplaced to me) - see "swapMayExposeCSEOpportunities()". Differential Revision: https://reviews.llvm.org/D63958 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@365711 91177308-0d34-0410-b5e6-96231b3b80d8