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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/105463] [12/13 Regression] MVE: Wrong code, incorrect alignment assumption Date: Tue, 03 May 2022 11:31:58 +0000 [thread overview] Message-ID: <bug-105463-4-3QgsZ334T6@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-105463-4@http.gcc.gnu.org/bugzilla/> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105463 Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Target Milestone|--- |12.0 --- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> --- We vectorize correctly using a 1-byte aligned load: void __GIMPLE (ssa,guessed_local(1073741824)) bar (const unsigned char * block) { vector(4) unsigned int vect__3.5; unsigned int buf[4]; __BB(2,guessed_local(1073741824)): vect__3.5_14 = __MEM <vector(4) unsigned int, 8> ((char * {ref-all})block_2(D)); __MEM <vector(4) unsigned int> ((char * {ref-all})&buf) = vect__3.5_14; foo (&buf); buf ={v} _Literal (unsigned int[4]) {CLOBBER(eol)}; return; and expand to (insn 9 8 10 (set (reg:V4SI 118 [ vect__3.5 ]) (unspec:V4SI [ (mem:V4SI (reg/v/f:SI 114 [ block ]) [0 MEM <vector(4) unsigned int> [(char * {ref-all})block_2(D)]+0 S16 A8]) ] UNSPEC_MISALIGNED_ACCESS)) "t.c":5:3 -1 (nil)) which also looks OK. 'buf' is appropriately aligned: (insn 10 9 0 (set (mem/c:V4SI (reg/f:SI 117) [0 MEM <vector(4) unsigned int> [(char * {ref-all})&buf]+0 S16 A64]) (reg:V4SI 118 [ vect__3.5 ])) "t.c":5:3 -1 and it's OK till the very end: (insn 9 12 10 2 (set (reg:V4SI 28 s12 [orig:118 vect__3.5 ] [118]) (unspec:V4SI [ (mem:V4SI (reg:SI 3 r3 [120]) [0 MEM <vector(4) unsigned int> [(char * {ref-all})block_2(D)]+0 S16 A8]) ] UNSPEC_MISALIGNED_ACCESS)) "t.c":5:3 4951 {*movmisalignv4si_mve_load} (expr_list:REG_DEAD (reg:SI 3 r3 [120]) (nil))) so it's a bug in the machine description somehow.
next prev parent reply other threads:[~2022-05-03 11:31 UTC|newest] Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-05-03 9:52 [Bug target/105463] New: " acoplan at gcc dot gnu.org 2022-05-03 11:31 ` rguenth at gcc dot gnu.org [this message] 2022-05-03 11:34 ` [Bug target/105463] " rguenth at gcc dot gnu.org 2022-05-03 13:29 ` acoplan at gcc dot gnu.org 2022-05-03 13:42 ` [Bug target/105463] [11/12/13 " rguenth at gcc dot gnu.org 2022-05-03 14:59 ` rearnsha at gcc dot gnu.org 2022-05-03 16:19 ` acoplan at gcc dot gnu.org 2022-05-13 10:25 ` cvs-commit at gcc dot gnu.org 2022-05-13 10:31 ` [Bug target/105463] [11/12 " rearnsha at gcc dot gnu.org 2022-07-26 11:34 ` rguenth at gcc dot gnu.org 2022-09-02 10:16 ` cvs-commit at gcc dot gnu.org 2022-09-02 11:20 ` [Bug target/105463] [11 " cvs-commit at gcc dot gnu.org 2022-09-02 11:21 ` rearnsha at gcc dot gnu.org
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