------- Comment #106 from lucier at math dot purdue dot edu 2009-06-16 07:24 ------- This machine has 4ms ticks, so we're getting down to a few ticks difference with a benchmark of this size. It's 156ms with 4.2.4, 168ms with 4.5.0, and 164 ms when -frename-registers is added to the command line.
It's not just scheduling, there are more memory accesses with 4.5.0. With a problem roughly 10 times as large, the times are 4.2.4: 2912ms 4.5.0: 3204ms 4.5.0: 3120ms (adding -frename-registers) So there's a 7% difference with -frename-registers. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33928
