diff options
Diffstat (limited to 'configure.in')
| -rw-r--r-- | configure.in | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/configure.in b/configure.in index 0d16c1a9711..88d3a59506f 100644 --- a/configure.in +++ b/configure.in @@ -1539,6 +1539,26 @@ case $host_cpu in if test x"$pgac_cv_have_ppc_mutex_hint" = xyes ; then AC_DEFINE(HAVE_PPC_LWARX_MUTEX_HINT, 1, [Define to 1 if the assembler supports PPC's LWARX mutex hint bit.]) fi + # Check if compiler accepts "i"(x) when __builtin_constant_p(x). + AC_CACHE_CHECK([whether __builtin_constant_p(x) implies "i"(x) acceptance], + [pgac_cv_have_i_constraint__builtin_constant_p], + [AC_COMPILE_IFELSE([AC_LANG_PROGRAM( + [static inline int + addi(int ra, int si) + { + int res = 0; + if (__builtin_constant_p(si)) + __asm__ __volatile__( + " addi %0,%1,%2\n" : "=r"(res) : "b"(ra), "i"(si)); + return res; + } + int test_adds(int x) { return addi(3, x) + addi(x, 5); }], [])], + [pgac_cv_have_i_constraint__builtin_constant_p=yes], + [pgac_cv_have_i_constraint__builtin_constant_p=no])]) + if test x"$pgac_cv_have_i_constraint__builtin_constant_p" = xyes ; then + AC_DEFINE(HAVE_I_CONSTRAINT__BUILTIN_CONSTANT_P, 1, + [Define to 1 if __builtin_constant_p(x) implies "i"(x) acceptance.]) + fi ;; esac |