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Merge #579: Use __GNUC_PREREQ for detecting __builtin_expect 

c663397 Use __GNUC_PREREQ for detecting __builtin_expect (Tim Ruffing)

Pull request description:

Tree-SHA512: 659a721da835eb15966a2a5386d6ae4c3defbb6ad473905f14161a3cf36d1556d44d887602019c89ebeffdfd82ed469ff27914dc2aaee6648d1e0c8a22151c27
This commit is contained in:
Pieter Wuille 2019-02-04 14:30:56 -08:00
parent e34ceb333b c663397f46
commit b408c6a8b2
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GPG Key ID: A636E97631F767E0
2 changed files with 1 additions and 7 deletions
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6
configure.ac
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@ -153,12 +153,6 @@ AC_ARG_WITH([asm], [AS_HELP_STRING([--with-asm=x86_64|arm|no|auto]
AC_CHECK_TYPES([__int128])
AC_MSG_CHECKING([for __builtin_expect])
AC_COMPILE_IFELSE([AC_LANG_SOURCE([[void myfunc() {__builtin_expect(0,0);}]])],
[ AC_MSG_RESULT([yes]);AC_DEFINE(HAVE_BUILTIN_EXPECT,1,[Define this symbol if __builtin_expect is available]) ],
[ AC_MSG_RESULT([no])
])
if test x"$enable_coverage" = x"yes"; then
AC_DEFINE(COVERAGE, 1, [Define this symbol to compile out all VERIFY code])
CFLAGS="$CFLAGS -O0 --coverage"

2
src/util.h
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@ -36,7 +36,7 @@ static SECP256K1_INLINE void secp256k1_callback_call(const secp256k1_callback *
} while(0)
#endif
#ifdef HAVE_BUILTIN_EXPECT
#if SECP256K1_GNUC_PREREQ(3, 0)
#define EXPECT(x,c) __builtin_expect((x),(c))
#else
#define EXPECT(x,c) (x)