[Bug c/117804] RISC-V: Worse codegen in mc_chroma of x264

2024-11-27 Thread rguenth at gcc dot gnu.org via Gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117804 Richard Biener changed: What|Removed |Added See Also||https://gcc.gnu.org/bugzill

[Bug c/117804] RISC-V: Worse codegen in mc_chroma of x264

2024-11-27 Thread rdapp at gcc dot gnu.org via Gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117804 --- Comment #1 from Robin Dapp --- The problem is that at combine-time we don't know the range of cA, cB etc anymore so we can't just combine those to the two-operand widening pattern. I have a local patch that introduces a widening FMA operati