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* [Bug target/82139] unnecessary movapd with _mm_castsi128_pd to use BLENDPD on __m128i results [not found] <bug-82139-4@http.gcc.gnu.org/bugzilla/> @ 2021-09-04 3:01 ` pinskia at gcc dot gnu.org 2021-09-06 6:09 ` crazylht at gmail dot com 1 sibling, 0 replies; 2+ messages in thread From: pinskia at gcc dot gnu.org @ 2021-09-04 3:01 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82139 Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Last reconfirmed| |2021-09-04 Keywords| |ra Status|UNCONFIRMED |NEW Ever confirmed|0 |1 --- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> --- It is worse on the trunk: .L2: movdqu (%rdi), %xmm1 movdqu (%rdi), %xmm0 addq $16, %rdi paddd %xmm3, %xmm1 paddd %xmm2, %xmm0 blendpd $2, %xmm0, %xmm1 movups %xmm1, -16(%rdi) cmpq %rdi, %rax jne .L2 Why two loads from %rdi here? This is done during RA as far as I can tell. ^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug target/82139] unnecessary movapd with _mm_castsi128_pd to use BLENDPD on __m128i results [not found] <bug-82139-4@http.gcc.gnu.org/bugzilla/> 2021-09-04 3:01 ` [Bug target/82139] unnecessary movapd with _mm_castsi128_pd to use BLENDPD on __m128i results pinskia at gcc dot gnu.org @ 2021-09-06 6:09 ` crazylht at gmail dot com 1 sibling, 0 replies; 2+ messages in thread From: crazylht at gmail dot com @ 2021-09-06 6:09 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82139 --- Comment #2 from Hongtao.liu <crazylht at gmail dot com> --- (In reply to Andrew Pinski from comment #1) > It is worse on the trunk: > .L2: > movdqu (%rdi), %xmm1 > movdqu (%rdi), %xmm0 > addq $16, %rdi > paddd %xmm3, %xmm1 > paddd %xmm2, %xmm0 > blendpd $2, %xmm0, %xmm1 > movups %xmm1, -16(%rdi) > cmpq %rdi, %rax > jne .L2 > > Why two loads from %rdi here? > This is done during RA as far as I can tell. It looks like generic cost model should be updated. w/ -O2 -msse4 -mno-avx -mtune=skylake looks optimal movdqu (%rdi), %xmm0 movdqa %xmm3, %xmm1 paddd %xmm0, %xmm1 paddd %xmm2, %xmm0 blendpd $2, %xmm0, %xmm1 movups %xmm1, (%rdi) addq $16, %rdi cmpq %rdi, %rax jne .L2 ^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2021-09-06 6:09 UTC | newest] Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- [not found] <bug-82139-4@http.gcc.gnu.org/bugzilla/> 2021-09-04 3:01 ` [Bug target/82139] unnecessary movapd with _mm_castsi128_pd to use BLENDPD on __m128i results pinskia at gcc dot gnu.org 2021-09-06 6:09 ` crazylht at gmail dot com
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