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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug target/91681] Missed optimization for 128 bit arithmetic operations Date: Mon, 27 Dec 2021 07:29:05 +0000 [thread overview] Message-ID: <bug-91681-4-jfl3C0fJhV@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-91681-4@http.gcc.gnu.org/bugzilla/> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91681 --- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> --- GCC 11 is better (note the widen multiply is still not detected): movq %rdx, %rax movq %rdi, %r9 movq %rdx, %rdi mulq %rsi movq %rdx, %rax xorl %edx, %edx movq %rax, %r10 movq %rdi, %rax movq %rdx, %r11 mulq %r9 addq %rax, %r10 movq %rsi, %rax adcq %rdx, %r11 mulq %rcx movq %rcx, %rax xorl %edi, %edi movq %r10, (%r8) movq %r11, 8(%r8) movq %rdx, %rsi mulq %r9 addq %rax, %rsi adcq %rdx, %rdi movq %rsi, 16(%r8) movq %rdi, 24(%r8) ret Still 2 more instructions than LLVM but at least no longer using the stack.
next parent reply other threads:[~2021-12-27 7:29 UTC|newest] Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top [not found] <bug-91681-4@http.gcc.gnu.org/bugzilla/> 2021-12-27 7:29 ` pinskia at gcc dot gnu.org [this message] 2022-07-25 16:37 ` cvs-commit at gcc dot gnu.org 2023-07-07 20:00 ` roger at nextmovesoftware dot com 2023-07-12 13:14 ` cvs-commit at gcc dot gnu.org 2023-07-12 13:46 ` cvs-commit at gcc dot gnu.org 2024-01-21 23:31 ` roger at nextmovesoftware dot com
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