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From: "pinskia at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug target/27971] eliminate shift in array[(x>>2)&3] Date: Fri, 09 Jun 2006 06:20:00 -0000 [thread overview] Message-ID: <20060609061837.15437.qmail@sourceware.org> (raw) In-Reply-To: <bug-27971-5748@http.gcc.gnu.org/bugzilla/> ------- Comment #1 from pinskia at gcc dot gnu dot org 2006-06-09 06:18 ------- This works correctly on powerpc. The rtl we get on x86_64 is: (insn 10 7 11 2 (parallel [ (set (reg:DI 61) (lshiftrt:DI (reg/v:DI 59 [ x ]) (const_int 2 [0x2]))) (clobber (reg:CC 17 flags)) ]) 456 {*lshrdi3_1_rex64} (insn_list:REG_DEP_TRUE 6 (nil)) (expr_list:REG_DEAD (reg/v:DI 59 [ x ]) (expr_list:REG_UNUSED (reg:CC 17 flags) (nil)))) (insn 11 10 13 2 (parallel [ (set (reg:DI 62) (and:DI (reg:DI 61) (const_int 3 [0x3]))) (clobber (reg:CC 17 flags)) ]) 297 {*anddi_1_rex64} (insn_list:REG_DEP_TRUE 10 (nil)) (expr_list:REG_DEAD (reg:DI 61) (expr_list:REG_UNUSED (reg:CC 17 flags) (nil)))) (insn 13 11 17 2 (set (reg:SI 64) (mem/s:SI (plus:DI (mult:DI (reg:DI 62) (const_int 4 [0x4])) (symbol_ref:DI ("array") <var_decl 0x2aaaaaf4bbb0 array>)) [3 array S4 A32])) 40 {*movsi_1} (insn_list:REG_DEP_TRUE 11 (nil)) (expr_list:REG_DEAD (reg:DI 62) (nil))) so I wonder if the something is not being reduced correctly. -- pinskia at gcc dot gnu dot org changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Component|pending |target Ever Confirmed|0 |1 GCC host triplet|x86_64-linux-gnu | Last reconfirmed|0000-00-00 00:00:00 |2006-06-09 06:18:37 date| | http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27971
next prev parent reply other threads:[~2006-06-09 6:18 UTC|newest] Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top 2006-06-09 6:18 [Bug pending/27971] New: " dean at arctic dot org 2006-06-09 6:20 ` pinskia at gcc dot gnu dot org [this message] 2006-06-09 6:43 ` [Bug target/27971] " pinskia at gcc dot gnu dot org 2007-11-28 23:06 ` raksit at google dot com 2007-12-05 19:28 ` raksit at google dot com 2008-01-11 4:51 ` raksit at gcc dot gnu dot org 2008-01-14 19:57 ` raksit at gcc dot gnu dot org
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