From: Maciej W. Rozycki <macro@linux-mips.org>
Date: Fri, 3 Apr 2015 22:25:00 +0000 (+0100)
Subject: MIPS: bitops.h: Avoid inline asm for constant FLS
X-Git-Tag: omap-for-v4.1/fixes-rc1~111^2~41
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cb5d4aad6844cdbe2f3b9f5d581ae1c9ec342009;p=pandora-kernel.git

MIPS: bitops.h: Avoid inline asm for constant FLS

GCC is smart enough to substitute the final result for FLS calculations
as implemented in the fallback C code we have in `__fls' and `fls'
applied to constant values.  The presence of inline asm defeats the
compiler though, forcing it to emit extraneous CLZ/DCLZ calculation for
processors that support these instructions.

Use `__builtin_constant_p' then to avoid inline asm altogether for
constants.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9681/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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