diff options
| author | Rasmus Villemoes <[email protected]> | 2014-06-19 15:15:31 +0200 |
|---|---|---|
| committer | Ingo Molnar <[email protected]> | 2014-07-05 11:21:52 +0200 |
| commit | 2172c1f5aa58310784f358ca20fdddfcdc2a0d7b (patch) | |
| tree | 5984b036cd43e60fc78404b9e95995284997b6e4 | |
| parent | 985c8dcbe15ddd8a1b98dc6b9c6403cb5d7012ab (diff) | |
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]>
| -rw-r--r-- | arch/x86/kernel/cpu/perf_event_intel_uncore.c | 5 |
1 files changed, 1 insertions, 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 65bbbea38b9c..e009f3cedf89 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; |