From: Jan Beulich <jbeulich@suse.com>
To: "gcc-patches@gcc.gnu.org" <gcc-patches@gcc.gnu.org>
Cc: Kirill Yukhin <kirill.yukhin@gmail.com>,
Hongtao Liu <hongtao.liu@intel.com>
Subject: [PATCH] x86/AVX512: use VMOVDDUP for broadcast to V2DF
Date: Wed, 14 Jun 2023 07:54:35 +0200 [thread overview]
Message-ID: <1901e956-dc34-cc03-0419-8d4338174384@suse.com> (raw)
Like is already the case for the AVX/AVX2 form, VMOVDDUP - acting on
double precision floating values - is more appropriate to use here, and
it can also result in shorter insn encodings when source is memory or
%xmm0...%xmm7, and no masking is applied (in allowing a 2-byte VEX
prefix then instead of a 3-byte one).
gcc/
* config/i386/sse.md (<avx512>_vec_dup<mode><mask_name>): Use
vmovddup.
--- a/gcc/config/i386/sse.md
+++ b/gcc/config/i386/sse.md
@@ -25724,9 +25724,9 @@
"TARGET_AVX512F"
{
/* There is no DF broadcast (in AVX-512*) to 128b register.
- Mimic it with integer variant. */
+ Mimic it with vmovddup, just like vec_dupv2df<mask_name> does. */
if (<MODE>mode == V2DFmode)
- return "vpbroadcastq\t{%1, %0<mask_operand2>|%0<mask_operand2>, %q1}";
+ return "vmovddup\t{%1, %0<mask_operand2>|%0<mask_operand2>, %q1}";
return "v<sseintprefix>broadcast<bcstscalarsuff>\t{%1, %0<mask_operand2>|%0<mask_operand2>, %<iptr>1}";
}
next reply other threads:[~2023-06-14 5:54 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-06-14 5:54 Jan Beulich [this message]
2023-06-14 6:30 ` Hongtao Liu
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