https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102543
--- Comment #3 from Hongtao.liu <crazylht at gmail dot com> --- (In reply to Richard Biener from comment #2) > Caused by > > commit 001e73373e6d2e7c756141e0d7ac8e24ae1574ad > Author: Sergey Shalnov <sergey.shal...@intel.com> > Date: Thu Feb 8 23:31:15 2018 +0100 > > re PR target/83008 ([performance] Is it better to avoid extra > instructions in data passing between loops?) > > PR target/83008 > * config/i386/x86-tune-costs.h (skylake_cost): Fix cost of > storing integer register in SImode. Fix cost of 256 and 512 > byte aligned SSE register store. > > * config/i386/i386.c (ix86_multiplication_cost): Fix > multiplication cost for TARGET_AVX512DQ. This patch looks like it is adjusting the cost of the vector and scalar stores, but forgot to increase unalign sse store cost to at least the same as aligned ones.
