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From: "luoxhu at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug target/106069] [12/13 Regression] wrong code with -O -fno-tree-forwprop -maltivec on ppc64le Date: Thu, 30 Jun 2022 08:15:06 +0000 [thread overview] Message-ID: <bug-106069-4-wKk1LUOpl7@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-106069-4@http.gcc.gnu.org/bugzilla/> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106069 --- Comment #5 from luoxhu at gcc dot gnu.org --- Seems combine wrongly merged two vec_select instructions: Trying 188 -> 199: 188: r343:V4SI=vec_select(vec_concat(r168:V4SI,r338:V4SI),parallel) REG_DEAD r338:V4SI REG_DEAD r168:V4SI 199: {r353:SI=vec_select(r343:V4SI,parallel);clobber scratch;} Failed to match this instruction: (parallel [ (set (reg:SI 353) (vec_select:SI (reg:V4SI 338) (parallel [ (const_int 3 [0x3]) ]))) (clobber (scratch:V4SI)) (set (reg:V4SI 343) (vec_select:V4SI (vec_concat:V8SI (reg/v:V4SI 168 [ R02$m_simd ]) (reg:V4SI 338)) (parallel [ (const_int 2 [0x2]) (const_int 6 [0x6]) (const_int 3 [0x3]) (const_int 7 [0x7]) ]))) ]) Failed to match this instruction: (parallel [ (set (reg:SI 353) (vec_select:SI (reg:V4SI 338) (parallel [ (const_int 3 [0x3]) ]))) (set (reg:V4SI 343) (vec_select:V4SI (vec_concat:V8SI (reg/v:V4SI 168 [ R02$m_simd ]) (reg:V4SI 338)) (parallel [ (const_int 2 [0x2]) (const_int 6 [0x6]) (const_int 3 [0x3]) (const_int 7 [0x7]) ]))) ]) Successfully matched this instruction: (set (reg:V4SI 343) (vec_select:V4SI (vec_concat:V8SI (reg/v:V4SI 168 [ R02$m_simd ]) (reg:V4SI 338)) (parallel [ (const_int 2 [0x2]) (const_int 6 [0x6]) (const_int 3 [0x3]) (const_int 7 [0x7]) ]))) Successfully matched this instruction: (set (reg:SI 353) (vec_select:SI (reg:V4SI 338) (parallel [ (const_int 3 [0x3]) ]))) allowing combination of insns 188 and 199 original costs 4 + 8 = 12 replacement costs 4 + 8 = 12 modifying insn i2 188: r343:V4SI=vec_select(vec_concat(r168:V4SI,r338:V4SI),parallel) REG_DEAD r168:V4SI deferring rescan insn with uid = 188. modifying insn i3 199: {r353:SI=vec_select(r338:V4SI,parallel);clobber scratch;} REG_DEAD r338:V4SI deferring rescan insn with uid = 199.
next prev parent reply other threads:[~2022-06-30 8:15 UTC|newest] Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-06-23 23:13 [Bug target/106069] New: " mpolacek at gcc dot gnu.org 2022-06-23 23:15 ` [Bug target/106069] [12/13 Regression] " mpolacek at gcc dot gnu.org 2022-06-23 23:18 ` mpolacek at gcc dot gnu.org 2022-06-24 3:25 ` luoxhu at gcc dot gnu.org 2022-06-24 13:03 ` mpolacek at gcc dot gnu.org 2022-06-30 8:13 ` luoxhu at gcc dot gnu.org 2022-06-30 8:15 ` luoxhu at gcc dot gnu.org [this message] 2022-06-30 17:32 ` segher at gcc dot gnu.org 2022-06-30 17:34 ` segher at gcc dot gnu.org 2022-07-01 1:52 ` luoxhu at gcc dot gnu.org 2022-07-25 15:54 ` rguenth at gcc dot gnu.org 2022-07-25 20:16 ` segher at gcc dot gnu.org 2022-07-25 20:18 ` segher at gcc dot gnu.org 2022-07-26 3:34 ` luoxhu at gcc dot gnu.org 2022-07-26 3:34 ` luoxhu at gcc dot gnu.org 2022-07-26 3:35 ` luoxhu at gcc dot gnu.org 2022-07-26 3:53 ` luoxhu at gcc dot gnu.org 2022-07-26 6:28 ` luoxhu at gcc dot gnu.org 2022-07-29 11:10 ` rguenth at gcc dot gnu.org 2022-07-29 11:21 ` rguenth at gcc dot gnu.org 2022-08-03 6:10 ` yinyuefengyi at gmail dot com 2022-08-03 6:38 ` yinyuefengyi at gmail dot com 2022-08-03 8:06 ` linkw at gcc dot gnu.org 2022-08-03 8:24 ` rguenther at suse dot de 2022-08-03 8:50 ` linkw at gcc dot gnu.org 2022-08-03 8:59 ` rguenth at gcc dot gnu.org 2022-08-03 9:20 ` rsandifo at gcc dot gnu.org 2022-08-03 9:25 ` rsandifo at gcc dot gnu.org 2022-08-03 18:01 ` segher at gcc dot gnu.org 2022-08-03 18:06 ` segher at gcc dot gnu.org 2022-08-04 9:17 ` rsandifo at gcc dot gnu.org 2022-08-04 9:21 ` rearnsha at gcc dot gnu.org 2022-08-04 9:59 ` yinyuefengyi at gmail dot com 2022-08-04 10:01 ` yinyuefengyi at gmail dot com 2023-01-16 18:00 ` jakub at gcc dot gnu.org 2023-03-24 16:16 ` jakub at gcc dot gnu.org 2023-03-24 17:01 ` bergner at gcc dot gnu.org 2023-03-31 2:57 ` yinyuefengyi at gmail dot com 2023-05-08 12:24 ` [Bug target/106069] [12/13/14 " rguenth at gcc dot gnu.org
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