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From: "crazylht at gmail dot com" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug target/105513] [9/10/11/12/13 Regression] Unnecessary SSE spill since r9-5748-g1d4b4f4979171ef0 Date: Fri, 20 May 2022 08:29:19 +0000 [thread overview] Message-ID: <bug-105513-4-BTf6RmbCGJ@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-105513-4@http.gcc.gnu.org/bugzilla/> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105513 --- Comment #6 from Hongtao.liu <crazylht at gmail dot com> --- Also notice a intersting case impacted by a separate m alternatvie. typedef long v2di __attribute__((vector_size(16))); v2di foo (v2di a) { a[1] = 1113; return a; } with -O2 gcc generates foo(long __vector(2)): movhps .LC0(%rip), %xmm0 ret .LC0: .quad 1113 llvm has foo(long __vector(2)): # @foo(long __vector(2)) movl $1113, %eax # imm = 0x459 movq %rax, %xmm1 punpcklqdq %xmm1, %xmm0 # xmm0 = xmm0[0],xmm1[0] retq Microbenchmark show both both sequences are almost as fast, really don't know which is better.
next prev parent reply other threads:[~2022-05-20 8:29 UTC|newest] Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-05-07 8:24 [Bug rtl-optimization/105513] New: [9/10/11/12/13 Regression] Unnecessary SSE spill amonakov at gcc dot gnu.org 2022-05-09 6:50 ` [Bug rtl-optimization/105513] [9/10/11/12/13 Regression] Unnecessary SSE spill since r9-5748-g1d4b4f4979171ef0 marxin at gcc dot gnu.org 2022-05-09 6:57 ` [Bug target/105513] " pinskia at gcc dot gnu.org 2022-05-09 8:05 ` rguenth at gcc dot gnu.org 2022-05-09 13:32 ` crazylht at gmail dot com 2022-05-10 7:24 ` ubizjak at gmail dot com 2022-05-13 7:10 ` crazylht at gmail dot com 2022-05-16 3:06 ` crazylht at gmail dot com 2022-05-20 8:29 ` crazylht at gmail dot com [this message] 2022-05-20 9:02 ` amonakov at gcc dot gnu.org 2022-05-20 9:12 ` crazylht at gmail dot com 2022-05-27 9:48 ` [Bug target/105513] [10/11/12/13 " rguenth at gcc dot gnu.org 2022-06-08 3:24 ` cvs-commit at gcc dot gnu.org 2022-06-28 10:49 ` jakub at gcc dot gnu.org 2023-07-07 10:43 ` [Bug target/105513] [11/12/13/14 " rguenth at gcc dot gnu.org 2024-02-21 4:52 ` pinskia at gcc dot gnu.org
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