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* [Bug target/105072] New: Miss optimization for pmovzxbq. @ 2022-03-28 3:50 crazylht at gmail dot com 2022-03-28 14:42 ` [Bug target/105072] " crazylht at gmail dot com ` (2 more replies) 0 siblings, 3 replies; 4+ messages in thread From: crazylht at gmail dot com @ 2022-03-28 3:50 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105072 Bug ID: 105072 Summary: Miss optimization for pmovzxbq. Product: gcc Version: 12.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: target Assignee: unassigned at gcc dot gnu.org Reporter: crazylht at gmail dot com Target Milestone: --- This is quoted from PR105066: It's also essential that these loads fold efficiently into memory source operands for PMOVZX; pmovzxbq is one of the major use-cases for a 16-bit load. That may be a separate bug, IDK https://godbolt.org/z/3a9T55n3q shows _mm_cvtepu8_epi32(_mm_loadu_si32(p)) does fold a 32-bit memory source operand nicely to pmovzxbd (%rdi), %xmm0 which can micro-fuse into a single uop on Intel CPUs (for the 128-bit destination version, not YMM), but disaster with 16-bit loads: __m128i pmovzxbq(void *p){ return _mm_cvtepu8_epi64(_mm_loadu_si16(p)); } pmovzxbq(void*): # -O3 -msse4.1 -mtune=haswell pxor %xmm0, %xmm0 # 1 uop pinsrw $0, (%rdi), %xmm0 # 2 uops, one for shuffle port pmovzxbq %xmm0, %xmm0 # 1 uop for the same shuffle port ret (_mm_cvtepu8_epi64 requires SSE4.1 so there's no interaction with the -mno-sse4.1 implementation of the load.) ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug target/105072] Miss optimization for pmovzxbq. 2022-03-28 3:50 [Bug target/105072] New: Miss optimization for pmovzxbq crazylht at gmail dot com @ 2022-03-28 14:42 ` crazylht at gmail dot com 2022-05-09 10:59 ` cvs-commit at gcc dot gnu.org 2022-05-09 11:01 ` crazylht at gmail dot com 2 siblings, 0 replies; 4+ messages in thread From: crazylht at gmail dot com @ 2022-03-28 14:42 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105072 --- Comment #1 from Hongtao.liu <crazylht at gmail dot com> --- Created attachment 52699 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=52699&action=edit Patch pending for GCC13 ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug target/105072] Miss optimization for pmovzxbq. 2022-03-28 3:50 [Bug target/105072] New: Miss optimization for pmovzxbq crazylht at gmail dot com 2022-03-28 14:42 ` [Bug target/105072] " crazylht at gmail dot com @ 2022-05-09 10:59 ` cvs-commit at gcc dot gnu.org 2022-05-09 11:01 ` crazylht at gmail dot com 2 siblings, 0 replies; 4+ messages in thread From: cvs-commit at gcc dot gnu.org @ 2022-05-09 10:59 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105072 --- Comment #2 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by hongtao Liu <liuhongt@gcc.gnu.org>: https://gcc.gnu.org/g:8b59556e1c72c7c3654a7d7c675832d9fd38b7a0 commit r13-203-g8b59556e1c72c7c3654a7d7c675832d9fd38b7a0 Author: liuhongt <hongtao.liu@intel.com> Date: Mon Mar 28 15:31:53 2022 +0800 Optimize vec_setv8{hi,hf}_0 + pmovzxbq to pmovzxbq. gcc/ChangeLog: PR target/105072 * config/i386/sse.md (*sse4_1_<code>v2qiv2di2<mask_name>_1): New define_insn. (*sse4_1_zero_extendv2qiv2di2_2): New pre_reload define_insn_and_split. gcc/testsuite/ChangeLog: * gcc.target/i386/pr105072.c: New test. ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug target/105072] Miss optimization for pmovzxbq. 2022-03-28 3:50 [Bug target/105072] New: Miss optimization for pmovzxbq crazylht at gmail dot com 2022-03-28 14:42 ` [Bug target/105072] " crazylht at gmail dot com 2022-05-09 10:59 ` cvs-commit at gcc dot gnu.org @ 2022-05-09 11:01 ` crazylht at gmail dot com 2 siblings, 0 replies; 4+ messages in thread From: crazylht at gmail dot com @ 2022-05-09 11:01 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105072 Hongtao.liu <crazylht at gmail dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- Resolution|--- |FIXED Status|UNCONFIRMED |RESOLVED --- Comment #3 from Hongtao.liu <crazylht at gmail dot com> --- Fixed in GCC13. ^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2022-05-09 11:01 UTC | newest] Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2022-03-28 3:50 [Bug target/105072] New: Miss optimization for pmovzxbq crazylht at gmail dot com 2022-03-28 14:42 ` [Bug target/105072] " crazylht at gmail dot com 2022-05-09 10:59 ` cvs-commit at gcc dot gnu.org 2022-05-09 11:01 ` crazylht at gmail dot com
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