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perf/x86: Micro-optimize nhmex_rbox_get_constraint()

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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>
This commit is contained in:
Rasmus Villemoes 2014-06-19 15:15:31 +02:00 • committed by Ingo Molnar
parent 985c8dcbe1
commit 2172c1f5aa
1 changed files with 1 additions and 4 deletions
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5
arch/x86/kernel/cpu/perf_event_intel_uncore.c
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@ -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;