public inbox for gcc-cvs@sourceware.org
help / color / mirror / Atom feed
* [gcc r14-2833] Add UNSPEC_MASKOP to vpbroadcastm pattern.
@ 2023-07-28 2:07 hongtao Liu
0 siblings, 0 replies; only message in thread
From: hongtao Liu @ 2023-07-28 2:07 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:54e54f77c1012ab53126314181c51eaee146ad5d
commit r14-2833-g54e54f77c1012ab53126314181c51eaee146ad5d
Author: liuhongt <hongtao.liu@intel.com>
Date: Thu Jul 27 15:14:39 2023 +0800
Add UNSPEC_MASKOP to vpbroadcastm pattern.
Prevent rtl optimization of vec_duplicate + zero_extend to
vpbroadcastm since there could be an extra kmov after RA.
gcc/ChangeLog:
PR target/110788
* config/i386/sse.md (avx512cd_maskb_vec_dup<mode>): Add
UNSPEC_MASKOP.
(avx512cd_maskw_vec_dup<mode>): Ditto.
gcc/testsuite/ChangeLog:
* gcc.target/i386/pr110788.c: New test.
Diff:
---
gcc/config/i386/sse.md | 8 ++++++--
gcc/testsuite/gcc.target/i386/pr110788.c | 11 +++++++++++
2 files changed, 17 insertions(+), 2 deletions(-)
diff --git a/gcc/config/i386/sse.md b/gcc/config/i386/sse.md
index 35fd66ed4aa..51961bbfc0b 100644
--- a/gcc/config/i386/sse.md
+++ b/gcc/config/i386/sse.md
@@ -26778,11 +26778,14 @@
(set_attr "prefix" "evex")
(set_attr "mode" "<sseinsnmode>")])
+;; Use unspec to prevent rtl optimizer to optimize zero_extend + vec_duplicate
+;; to pbroadcastm, there could be an extra kmov after RA.
(define_insn "avx512cd_maskb_vec_dup<mode>"
[(set (match_operand:VI8_AVX512VL 0 "register_operand" "=v")
(vec_duplicate:VI8_AVX512VL
(zero_extend:DI
- (match_operand:QI 1 "register_operand" "k"))))]
+ (match_operand:QI 1 "register_operand" "k"))))
+ (unspec [(const_int 0)] UNSPEC_MASKOP)]
"TARGET_AVX512CD"
"vpbroadcastmb2q\t{%1, %0|%0, %1}"
[(set_attr "type" "mskmov")
@@ -26793,7 +26796,8 @@
[(set (match_operand:VI4_AVX512VL 0 "register_operand" "=v")
(vec_duplicate:VI4_AVX512VL
(zero_extend:SI
- (match_operand:HI 1 "register_operand" "k"))))]
+ (match_operand:HI 1 "register_operand" "k"))))
+ (unspec [(const_int 0)] UNSPEC_MASKOP)]
"TARGET_AVX512CD"
"vpbroadcastmw2d\t{%1, %0|%0, %1}"
[(set_attr "type" "mskmov")
diff --git a/gcc/testsuite/gcc.target/i386/pr110788.c b/gcc/testsuite/gcc.target/i386/pr110788.c
new file mode 100644
index 00000000000..4cf1676ccb6
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr110788.c
@@ -0,0 +1,11 @@
+/* { dg-do compile } */
+/* { dg-options "-O3 -march=cascadelake --param vect-partial-vector-usage=2" } */
+/* { dg-final { scan-assembler-not "vpbroadcastm" } } */
+
+double a[1024], b[1024];
+
+void foo (int n)
+{
+ for (int i = 0; i < n; ++i)
+ a[i] = b[i] * 3.;
+}
^ permalink raw reply [flat|nested] only message in thread
only message in thread, other threads:[~2023-07-28 2:07 UTC | newest]
Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2023-07-28 2:07 [gcc r14-2833] Add UNSPEC_MASKOP to vpbroadcastm pattern hongtao Liu
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).