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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug testsuite/63175] [4.9/5 regression] FAIL: gcc.dg/vect/costmodel/ppc/costmodel-bb-slp-9a.c scan-tree-dump-times slp2" basic block vectorized using SLP" 1 Date: Mon, 02 Mar 2015 14:24:00 -0000 [thread overview] Message-ID: <bug-63175-4-mzU8wOWRoJ@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-63175-4@http.gcc.gnu.org/bugzilla/> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63175 --- Comment #16 from Richard Biener <rguenth at gcc dot gnu.org> --- (In reply to Richard Biener from comment #15) > Btw, first of all unaligned stores are not supported according to the targets > vectorization hook, thus you'd need to peel the loop to make the store > aligned > which for some reason doesn't happen. Quite obvious - the loop iterates 8 times but the vectorization factor is 8 as well, so if we peel off a iteration to align the destination the vectorized loop will never enter. Why is the loop bound to i != 16 / sizeof *s? > But when peeled you certainly will see > byte/short/word stores at least. Like when I increase the iteration count I get for copy_short_0_1: .L.copy_Type_0_1: addis 6,2,.LANCHOR0@toc@ha addis 7,2,.LANCHOR1@toc@ha addi 6,6,.LANCHOR0@toc@l addi 7,7,.LANCHOR1@toc@l li 8,7 addi 9,6,2 mr 10,7 mtctr 8 .p2align 4,,15 .L2: addi 10,10,2 lhz 8,-2(10) addi 9,9,2 sth 8,-2(9) bdnz .L2 addi 8,7,14 addi 7,7,29 neg 5,8 lvx 1,0,8 lvx 0,0,7 li 7,16 lvsr 13,0,5 addi 8,10,14 addi 9,9,14 addi 10,10,16 vperm 0,1,0,13 stvx 0,6,7 .p2align 4,,15 .L3: lhzu 7,2(8) cmpld 7,10,8 sthu 7,2(9) bne+ 7,.L3 blr the cost model should probably reject this, but it does not: t.c:36:1: note: Cost model analysis: Vector inside of loop cost: 3 Vector prologue cost: 17 Vector epilogue cost: 2 Scalar iteration cost: 2 Scalar outside cost: 0 Vector outside cost: 19 prologue iterations: 7 epilogue iterations: 1 Calculated minimum iters for profitability: 10
next prev parent reply other threads:[~2015-03-02 14:24 UTC|newest] Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top [not found] <bug-63175-4@http.gcc.gnu.org/bugzilla/> 2014-09-05 8:47 ` rguenth at gcc dot gnu.org 2014-10-30 10:42 ` jakub at gcc dot gnu.org 2014-11-24 13:16 ` rguenth at gcc dot gnu.org 2015-02-21 20:07 ` msebor at gcc dot gnu.org 2015-02-22 20:38 ` macro@linux-mips.org 2015-02-24 6:56 ` msebor at gcc dot gnu.org 2015-02-25 20:45 ` msebor at gcc dot gnu.org 2015-02-26 10:19 ` rguenth at gcc dot gnu.org 2015-02-26 10:56 ` rguenth at gcc dot gnu.org 2015-02-27 9:18 ` rguenth at gcc dot gnu.org 2015-02-27 9:49 ` rguenth at gcc dot gnu.org 2015-02-27 11:23 ` rguenth at gcc dot gnu.org 2015-02-27 11:24 ` rguenth at gcc dot gnu.org 2015-02-28 9:26 ` msebor at gcc dot gnu.org 2015-03-02 14:14 ` rguenth at gcc dot gnu.org 2015-03-02 14:24 ` rguenth at gcc dot gnu.org [this message] 2015-03-02 16:24 ` msebor at gcc dot gnu.org 2015-03-02 16:48 ` rguenther at suse dot de 2015-03-02 16:50 ` rguenther at suse dot de 2015-03-02 16:58 ` msebor at gcc dot gnu.org 2015-03-02 17:47 ` rguenther at suse dot de 2015-03-02 18:13 ` msebor at gcc dot gnu.org 2015-03-02 18:23 ` rguenther at suse dot de 2015-03-03 5:10 ` msebor at gcc dot gnu.org 2015-03-03 9:21 ` rguenther at suse dot de 2015-03-03 9:42 ` rguenth at gcc dot gnu.org 2015-03-03 15:05 ` dje at gcc dot gnu.org 2015-03-03 16:19 ` wschmidt at gcc dot gnu.org 2015-03-03 16:22 ` wschmidt at gcc dot gnu.org 2015-03-04 1:15 ` msebor at gcc dot gnu.org 2015-03-04 9:17 ` rguenth at gcc dot gnu.org 2015-03-04 13:42 ` dje at gcc dot gnu.org 2015-03-04 13:55 ` rguenther at suse dot de 2015-03-06 18:44 ` msebor at gcc dot gnu.org 2015-03-07 16:19 ` [Bug testsuite/63175] [4.9 " law at redhat dot com 2015-03-10 21:07 ` msebor at gcc dot gnu.org 2015-03-11 10:09 ` rguenth at gcc dot gnu.org 2015-03-23 18:58 ` msebor at gcc dot gnu.org 2015-05-29 16:49 ` wschmidt at gcc dot gnu.org
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