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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/98867] Failure to use SRI instruction for shift-right-and-insert vector operations
Date: Thu, 04 Feb 2021 07:10:07 +0000 [thread overview]
Message-ID: <bug-98867-4-ohIY8fn07O@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-98867-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98867
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed| |2021-02-04
Severity|normal |enhancement
Ever confirmed|0 |1
Status|UNCONFIRMED |NEW
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
>This may be a bit too complex for combine to match though
I don't think so really:
Trying 18, 13 -> 19:
18: r110:V16QI=r111:V16QI&r112:V16QI
REG_DEAD r111:V16QI
REG_EQUAL r111:V16QI&const_vector
13: r106:V16QI=r107:V16QI 0>>const_vector
REG_DEAD r107:V16QI
19: r113:V16QI=r106:V16QI|r110:V16QI
REG_DEAD r110:V16QI
REG_DEAD r106:V16QI
Failed to match this instruction:
(set (reg:V16QI 113 [ vect__6.15 ])
(ior:V16QI (and:V16QI (reg:V16QI 111 [ MEM[symbol: out, index: ivtmp.22_30,
offset: 0B] ])
(reg:V16QI 112))
(lshiftrt:V16QI (reg:V16QI 107 [ MEM[symbol: in, index: ivtmp.22_30,
offset: 0B] ])
(const_vector:V16QI [
(const_int 6 [0x6]) repeated x16
]))))
The only problem is (reg:V16QI 112) was not replaced with const_vector, that it
was formed from.
But insn 18 does have this REG_EQUAL:
(expr_list:REG_EQUAL (and:V16QI (reg:V16QI 111 [ MEM[symbol: out,
index: ivtmp.22_30, offset: 0B] ])
(const_vector:V16QI [
(const_int -4 [0xfffffffffffffffc]) repeated x16
]))
So it might be easy to match, just combine is not showing all of what is being
tried?
So maybe adding a pattern for it might be easy ....
prev parent reply other threads:[~2021-02-04 7:10 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-28 15:02 [Bug target/98867] New: " ktkachov at gcc dot gnu.org
2021-02-04 7:10 ` pinskia at gcc dot gnu.org [this message]
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