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From: "baldrick at free dot fr" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug ada/26797] [4.3 regression] ACATS cxh1001 fails Date: Thu, 08 Mar 2007 16:06:00 -0000 [thread overview] Message-ID: <20070308160620.7489.qmail@sourceware.org> (raw) In-Reply-To: <bug-26797-7210@http.gcc.gnu.org/bugzilla/> ------- Comment #27 from baldrick at free dot fr 2007-03-08 16:06 ------- Subject: Re: [4.3 regression] ACATS cxh1001 fails > > y = __builtin_nop(x); valid = (y>=lower_bound && y <=upper_bound); > > The point is that the intrinsic would be opaque to the optimizers, > > and would only be lowered to the identity function *after* the tree > > optimizers have run. One annoyance is that presumably intrinsics > > would be needed for all integer and float precisions, eg > > __builtin_nop8, __builtin_nop16, etc. > > More than each precision. The VIEW_CONVERT_EXPR is to the base type > and there can be an unlimited number of them for each precision. I don't see what the problem is - you don't have to convert to the base type, you can always convert to some standard type of that precision, eg int32, before calling the builtin. > Because it has to work with arbitrary types, a builtin won't do it. See above. > We could certainly add a new tree expression that says "don't look through > this for VRP purposes", but we already have V_C_E. Sure, it's just that overloading V_C_E like this feels somehow wrong to me. However I haven't been able to put my finger on any technical obstacle to this use of V_C_E. Ciao, D. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26797
next prev parent reply other threads:[~2007-03-08 16:06 UTC|newest] Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top 2006-03-22 7:29 [Bug ada/26797] New: [4.2 Regression] ACATS c35507m cd2a23e cxh1001 wrong code laurent at guerby dot net 2006-03-22 10:33 ` [Bug ada/26797] " ebotcazou at gcc dot gnu dot org 2006-03-22 18:48 ` [Bug ada/26797] [4.2 Regression] ACATS c35507m cd2a23e cxh1001 failures ebotcazou at gcc dot gnu dot org 2006-03-22 21:08 ` pinskia at gcc dot gnu dot org 2006-03-23 13:19 ` [Bug tree-optimization/26797] " baldrick at free dot fr 2006-03-27 17:09 ` law at redhat dot com 2006-03-27 17:23 ` law at redhat dot com 2006-03-27 20:12 ` laurent at guerby dot net 2006-03-27 20:31 ` law at redhat dot com 2006-03-28 3:56 ` kenner at vlsi1 dot ultra dot nyu dot edu 2006-03-28 15:01 ` law at redhat dot com 2006-03-28 15:33 ` law at redhat dot com 2006-03-30 7:58 ` ebotcazou at gcc dot gnu dot org 2006-03-30 8:25 ` ebotcazou at gcc dot gnu dot org 2006-03-30 8:32 ` ebotcazou at gcc dot gnu dot org 2006-03-30 12:13 ` kenner at vlsi1 dot ultra dot nyu dot edu 2006-04-21 23:40 ` [Bug tree-optimization/26797] [4.2 Regression] ACATS c35507m cd2a23e cxh1001 fail pinskia at gcc dot gnu dot org 2006-04-21 23:41 ` pinskia at gcc dot gnu dot org 2006-04-21 23:41 ` pinskia at gcc dot gnu dot org 2006-06-04 8:27 ` christian dot joensson at gmail dot com 2006-06-04 18:19 ` mmitchel at gcc dot gnu dot org 2006-06-26 23:41 ` laurent at guerby dot net 2006-06-27 3:05 ` kenner at vlsi1 dot ultra dot nyu dot edu 2006-10-29 23:17 ` [Bug ada/26797] [4.2/4.3 regression] " ebotcazou at gcc dot gnu dot org 2006-10-30 9:04 ` law at redhat dot com 2006-10-30 9:21 ` ebotcazou at gcc dot gnu dot org 2007-03-04 10:06 ` ebotcazou at gcc dot gnu dot org 2007-03-04 10:08 ` [Bug ada/26797] [4.3 regression] ACATS " ebotcazou at gcc dot gnu dot org 2007-03-08 9:57 ` [Bug ada/26797] [4.3 regression] ACATS cxh1001 fails baldrick at gcc dot gnu dot org 2007-03-08 12:54 ` kenner at vlsi1 dot ultra dot nyu dot edu 2007-03-08 16:06 ` baldrick at free dot fr [this message] 2007-03-08 16:52 ` kenner at vlsi1 dot ultra dot nyu dot edu 2007-03-09 10:41 ` baldrick at free dot fr 2007-03-09 11:11 ` rguenth at gcc dot gnu dot org 2007-03-09 11:19 ` ebotcazou at gcc dot gnu dot org 2007-03-09 11:35 ` baldrick at free dot fr 2007-03-09 11:50 ` baldrick at free dot fr 2007-03-09 13:59 ` kenner at vlsi1 dot ultra dot nyu dot edu 2007-03-09 14:19 ` kenner at vlsi1 dot ultra dot nyu dot edu 2007-03-09 14:29 ` kenner at vlsi1 dot ultra dot nyu dot edu 2007-03-09 22:44 ` baldrick at free dot fr 2007-03-09 23:10 ` baldrick at free dot fr 2007-03-09 23:13 ` kenner at vlsi1 dot ultra dot nyu dot edu 2007-03-09 23:41 ` baldrick at free dot fr 2007-03-10 0:17 ` kenner at vlsi1 dot ultra dot nyu dot edu 2007-03-10 16:52 ` ebotcazou at gcc dot gnu dot org 2007-03-13 10:30 ` baldrick at free dot fr 2007-03-13 12:34 ` kenner at vlsi1 dot ultra dot nyu dot edu 2007-09-12 15:53 ` ebotcazou at gcc dot gnu dot org 2007-09-12 15:55 ` ebotcazou at gcc dot gnu dot org 2007-09-15 6:35 ` law at redhat dot com
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