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From: "crazylht at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/98172] Update -mtune=generic for the current Intel and
 AMD processors
Date: Thu, 21 Jan 2021 01:38:18 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98172

--- Comment #9 from Hongtao.liu <crazylht at gmail dot com> ---
> .L3:
> 	vmovupd	(%rcx,%rax), %xmm3
> 	vmovupd	(%rsi,%rax), %xmm4
> 	vinsertf128	$0x1, 16(%rcx,%rax), %ymm3, %ymm0
> 	vinsertf128	$0x1, 16(%rsi,%rax), %ymm4, %ymm2
> 	vmovupd	(%rdi,%rax), %xmm5
> 	vinsertf128	$0x1, 16(%rdi,%rax), %ymm5, %ymm1
> 	vfmadd132pd	%ymm2, %ymm1, %ymm0
> 	vmovupd	%xmm0, (%rdx,%rax)
> 	vextractf128	$0x1, %ymm0, 16(%rdx,%rax)
> 	addq	$32, %rax
> 	cmpq	$2048, %rax
> 	jne	.L3
> 	vzeroupper
> 	ret

The kernel loop could be better as

.L3:
        vmovupd (%rcx,%rax), %ymm0
        vmovupd (%rdi,%rax), %ymm1
        vfmadd132pd     (%rsi,%rax), %ymm1, %ymm0
        vmovupd %ymm0, (%rdx,%rax)
        addq    $32, %rax
        cmpq    $2048, %rax
        jne     .L3=