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From: "arndt at jjj dot de" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/22568] New: Should use cmov in some stituations Date: Wed, 20 Jul 2005 14:21:00 -0000 [thread overview] Message-ID: <20050720134633.22568.arndt@jjj.de> (raw) With (ulong a, ulong b) and code like if ( a<b ) { ulong t=a; a=b; b=t; } gcc should (if a and b are in registers already) not emit a conditional jump but code like MOV a, t; CMP a, b; CMOVcc b, a; CMOVcc t, b; Other such examples are easily found. If I got it correctly, gcc emits CMOVcc in just one situation, the conditional assignment. Machine is AMD64, OS is SuSE Linux 9.3 gcc (GCC) 3.3.5 20050117 (prerelease) (SUSE Linux) -- Summary: Should use cmov in some stituations Product: gcc Version: unknown Status: UNCONFIRMED Severity: enhancement Priority: P2 Component: c++ AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: arndt at jjj dot de CC: gcc-bugs at gcc dot gnu dot org http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22568
next reply other threads:[~2005-07-20 13:46 UTC|newest] Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top 2005-07-20 14:21 arndt at jjj dot de [this message] 2005-07-20 14:27 ` [Bug c++/22568] " matz at suse dot de 2005-07-20 15:14 ` [Bug rtl-optimization/22568] " pinskia at gcc dot gnu dot org 2005-08-31 9:42 ` rguenth at gcc dot gnu dot org 2005-09-01 12:38 ` rguenth at gcc dot gnu dot org 2005-09-02 9:47 ` bonzini at gcc dot gnu dot org 2005-09-02 9:54 ` rguenth at gcc dot gnu dot org
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