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
