[Bug target/97832] AoSoA complex caxpy-like loops: AVX2+FMA -Ofast 7 times slower than -O3

2020-11-16 Thread already5chosen at yahoo dot com via Gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97832 --- Comment #3 from Michael_S --- (In reply to Richard Biener from comment #2) > It's again reassociation making a mess out of the natural SLP opportunity > (and thus SLP discovery fails miserably). > > One idea worth playing with would be to ch

[Bug target/97832] AoSoA complex caxpy-like loops: AVX2+FMA -Ofast 7 times slower than -O3

2020-11-16 Thread rguenth at gcc dot gnu.org via Gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97832 --- Comment #2 from Richard Biener --- It's again reassociation making a mess out of the natural SLP opportunity (and thus SLP discovery fails miserably). One idea worth playing with would be to change reassociation to rank references from the s

[Bug target/97832] AoSoA complex caxpy-like loops: AVX2+FMA -Ofast 7 times slower than -O3

2020-11-15 Thread rguenth at gcc dot gnu.org via Gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97832 Richard Biener changed: What|Removed |Added Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot gnu.org