On Tue, Aug 23, 2005 at 11:40:16AM -0700, Dan Nicolaescu wrote: > Is there a performance difference between the movl + movl and pushl > code sequences?
In this case, no. > If not maybe then gcc should generate pushl for -O2 > too because it is smaller code. It's not quite as simple as you make out. You can get pushes out of gcc with -mno-accumulate-outgoing-args, but then we have to add other compensation code elsewhere. IIRC, it was fairly well explored that we get equal or better performance by not using pushes on P2 class machines and later. r~
