On Mon, Nov 29, 2004 at 01:02:46AM -0800, Nicholas Miell wrote: > On Mon, 2004-11-29 at 09:11 +0100, Arjan van de Ven wrote: > > for what it's worth... cmov isn't faster on newer (pM/pIV/amd64 level) > > CPUs than the open coded conditional jump anymore.... > > so there no longer really is a reason to use cmov-only code. > > > > CMOVcc will use less space in the instruction cache than the Jcc/MOV > pair, though. only sometimes.... since cmov doens't work on all register/memory combinations extra code might be needed to glue that together... .... and we're suddenly talking about 0.01% performance ;)
