Commit-ID: 2172c1f5aa58310784f358ca20fdddfcdc2a0d7b Gitweb: http://git.kernel.org/tip/2172c1f5aa58310784f358ca20fdddfcdc2a0d7b Author: Rasmus Villemoes <[email protected]> AuthorDate: Thu, 19 Jun 2014 15:15:31 +0200 Committer: Ingo Molnar <[email protected]> CommitDate: Sat, 5 Jul 2014 11:21:52 +0200
perf/x86: Micro-optimize nhmex_rbox_get_constraint() Flipping the LSB doesn't require four lines of code. This shaves a few bytes of the generated code, including a branch. Signed-off-by: Rasmus Villemoes <[email protected]> Cc: Arnaldo Carvalho de Melo <[email protected]> Signed-off-by: Peter Zijlstra <[email protected]> Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Ingo Molnar <[email protected]> --- arch/x86/kernel/cpu/perf_event_intel_uncore.c | 5 +---- 1 file changed, 1 insertion(+), 4 deletions(-) diff --git a/arch/x86/kernel/cpu/perf_event_intel_uncore.c b/arch/x86/kernel/cpu/perf_event_intel_uncore.c index 65bbbea..e009f3c 100644 --- a/arch/x86/kernel/cpu/perf_event_intel_uncore.c +++ b/arch/x86/kernel/cpu/perf_event_intel_uncore.c @@ -2946,10 +2946,7 @@ again: * extra registers. If we failed to take an extra * register, try the alternative. */ - if (idx % 2) - idx--; - else - idx++; + idx ^= 1; if (idx != reg1->idx % 6) { if (idx == 2) config1 >>= 8; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
