reenable __builtin_clz for GNUC (and clang), recognizing that it is undefined for...
authorreed@google.com <reed@google.com@2bbb7eff-a529-9590-31e7-b0007b416f81>
Mon, 29 Apr 2013 15:34:35 +0000 (15:34 +0000)
committerreed@google.com <reed@google.com@2bbb7eff-a529-9590-31e7-b0007b416f81>
Mon, 29 Apr 2013 15:34:35 +0000 (15:34 +0000)
commit5c341d1ff1b58cc2b88c52f4ee41faf53a2a7578
treed643182fa710b7dc1df5f9a873881dccbae19119
parentbc57a29a7a9757064389bcd31bbc36069208756a
reenable __builtin_clz for GNUC (and clang), recognizing that it is undefined for a zero argument,
so we check for that explicitly.

git-svn-id: http://skia.googlecode.com/svn/trunk@8905 2bbb7eff-a529-9590-31e7-b0007b416f81
include/core/SkMath.h