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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/108724] [11 Regression] Poor codegen when summing two
 arrays without AVX or SSE
Date: Tue, 23 May 2023 12:55:13 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108724

--- Comment #10 from Richard Biener <rguenth at gcc dot gnu.org> ---
On trunk we're back to vectorizing but as intended with DImode which makes =
us
save half of the loads and stores and we think the extended required arithm=
etic
covers up for that (by quite some margin).

        movabsq $9223372034707292159, %rcx
        movq    (%rdx), %rax
        movq    (%rsi), %rsi
        movq    %rcx, %rdx
        andq    %rax, %rdx
        andq    %rsi, %rcx
        xorq    %rsi, %rax
        addq    %rcx, %rdx
        movabsq $-9223372034707292160, %rcx
        andq    %rcx, %rax
        xorq    %rdx, %rax
        movq    %rax, (%rdi)

vs

        movl    (%rdx), %eax
        addl    (%rsi), %eax
        movl    %eax, (%rdi)
        movl    4(%rdx), %eax
        addl    4(%rsi), %eax
        movl    %eax, 4(%rdi)=