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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug middle-end/58956] [4.7/4.8/4.9 Regression] wrong code at -O1 and above (affecting gcc 4.6 to trunk) Date: Tue, 19 Nov 2013 11:09:00 -0000 [thread overview] Message-ID: <bug-58956-4-4aYjkPdACM@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-58956-4@http.gcc.gnu.org/bugzilla/> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58956 --- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> --- Well, on GIMPLE all is ok <bb 2>: i_2 = c; *i_2 = foo (); but we expand it like ;; *i_2 = foo (); --- note, TER applies! (insn 5 4 6 (set (reg:QI 0 ax) (const_int 0 [0])) t.i:26 -1 (nil)) (call_insn 6 5 7 (set (reg:SI 0 ax) (call (mem:QI (symbol_ref:DI ("foo") [flags 0x3] <function_decl 0x7f2ae1c46200 foo>) [0 foo S1 A8]) (const_int 0 [0]))) t.i:26 -1 (expr_list:REG_EH_REGION (const_int 0 [0]) (nil)) (expr_list:REG_DEP_TRUE (use (reg:QI 0 ax)) (nil))) (insn 7 6 8 (set (reg:SI 90) (reg:SI 0 ax)) t.i:26 -1 (nil)) (insn 8 7 9 (set (reg:SI 91) (reg:SI 90)) t.i:26 -1 (insn 9 8 10 (set (reg/f:DI 92) (mem/f/c:DI (symbol_ref:DI ("c") [flags 0x2] <var_decl 0x7f2ae1c48260 c>) [0 c+0 S8 A64])) t.i:26 -1 (nil)) (insn 10 9 0 (set (mem:SI (reg/f:DI 92) [0 *i_2+0 S4 A32]) (reg:SI 91)) t.i:26 -1 (nil)) So indeed expand sees wrong IL - *c = foo () here. I have a patch.
next prev parent reply other threads:[~2013-11-19 11:09 UTC|newest] Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top 2013-11-01 5:14 [Bug tree-optimization/58956] New: " su at cs dot ucdavis.edu 2013-11-01 8:34 ` [Bug tree-optimization/58956] [4.7/4.8/4.9 Regression] " mpolacek at gcc dot gnu.org 2013-11-04 14:37 ` rguenth at gcc dot gnu.org 2013-11-09 21:56 ` mikpelinux at gmail dot com 2013-11-19 10:44 ` [Bug middle-end/58956] " rguenth at gcc dot gnu.org 2013-11-19 11:09 ` rguenth at gcc dot gnu.org [this message] 2013-11-19 13:28 ` rguenth at gcc dot gnu.org 2013-11-19 13:29 ` [Bug middle-end/58956] [4.7/4.8 " rguenth at gcc dot gnu.org 2013-12-05 13:10 ` rguenth at gcc dot gnu.org 2013-12-16 8:09 ` [Bug middle-end/58956] [4.7 " jakub at gcc dot gnu.org 2014-01-07 16:49 ` jakub at gcc dot gnu.org 2014-01-08 10:14 ` hp at gcc dot gnu.org 2014-01-08 10:22 ` rguenth at gcc dot gnu.org 2014-06-12 13:31 ` rguenth at gcc dot gnu.org
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