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| author | Rasmus Villemoes <linux@rasmusvillemoes.dk> | 2014-06-19 13:15:31 (GMT) |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2014-07-05 09:21:52 (GMT) |
| commit | 2172c1f5aa58310784f358ca20fdddfcdc2a0d7b (patch) | |
| tree | 5984b036cd43e60fc78404b9e95995284997b6e4 | |
| parent | 985c8dcbe15ddd8a1b98dc6b9c6403cb5d7012ab (diff) | |
| download | linux-2172c1f5aa58310784f358ca20fdddfcdc2a0d7b.tar.xz | |
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 <linux@rasmusvillemoes.dk>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1403183731-15402-1-git-send-email-linux@rasmusvillemoes.dk
Signed-off-by: Ingo Molnar <mingo@kernel.org>
| -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 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; |