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From: "dje at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug target/18154] New: Inefficient max/min code for PowerPC Date: Tue, 26 Oct 2004 04:18:00 -0000 [thread overview] Message-ID: <20041026041752.18154.dje@gcc.gnu.org> (raw) int min(int a, int b) { if (a < b) return a; else return b; } should produce rlwinm r2,r3,1,31,31 subfc r0,r4,r3 rlwinm r0,r4,1,31,31 subfe r0,r2,r0 andc r2,r4,r0 and r0,r3,r0 or r3,r0,r2 blr but instead produces a branch sequence mr r0,r3 mr r3,r4 cmpw cr7,r0,r4 bgelr- cr7 mr r3,r0 blr with unnecessary dependencies. -- Summary: Inefficient max/min code for PowerPC Product: gcc Version: 4.0.0 Status: UNCONFIRMED Keywords: missed-optimization Severity: enhancement Priority: P2 Component: target AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: dje at gcc dot gnu dot org CC: gcc-bugs at gcc dot gnu dot org GCC build triplet: *-*-* GCC host triplet: powerpc-*-* GCC target triplet: *-*-* http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18154
next reply other threads:[~2004-10-26 4:18 UTC|newest] Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top 2004-10-26 4:18 dje at gcc dot gnu dot org [this message] 2004-10-26 4:25 ` [Bug target/18154] " pinskia at gcc dot gnu dot org 2004-10-26 20:06 ` dje at gcc dot gnu dot org 2004-10-26 21:25 ` dje at gcc dot gnu dot org 2004-10-27 23:45 ` geoffk at gcc dot gnu dot org 2004-10-27 23:52 ` pinskia at gcc dot gnu dot org 2005-04-24 14:31 ` pinskia at gcc dot gnu dot org
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