diff options
Diffstat (limited to 'libgcc/configure.ac')
| -rw-r--r-- | libgcc/configure.ac | 46 |
1 files changed, 45 insertions, 1 deletions
diff --git a/libgcc/configure.ac b/libgcc/configure.ac index bff6e54..4aa03a4 100644 --- a/libgcc/configure.ac +++ b/libgcc/configure.ac @@ -424,7 +424,9 @@ case ${host} in # At present, we cannot turn -mfloat128 on via #pragma GCC target, so just # check if we have VSX (ISA 2.06) support to build the software libraries, and # whether the assembler can handle xsaddqp for hardware support. Also check if -# a new glibc is being used so that __builtin_cpu_supports can be used. +# a new glibc is being used so that __builtin_cpu_supports can be used. Check +# to see if glibc provides the necessary decimal <-> IEEE 128 function, and +# arrange to build our own version if they are not provided. powerpc*-*-linux*) saved_CFLAGS="$CFLAGS" CFLAGS="$CFLAGS -mabi=altivec -mvsx -mfloat128" @@ -457,6 +459,48 @@ powerpc*-*-linux*) __attribute__ ((__ifunc__ ("add_resolver")));])], [libgcc_cv_powerpc_float128_hw=yes], [libgcc_cv_powerpc_float128_hw=no])]) + AC_CACHE_CHECK([for PowerPC convert __float128 to/from _Decimal libraries], + [libgcc_cv_powerpc_float128_dec], + [AC_LINK_IFELSE( + [AC_LANG_SOURCE([#include <stdlib.h> + __attribute__((noinline)) __float128 f128_from_d128 (_Decimal128 d128) + { + return (__float128)d128; + } + __attribute__((noinline)) __float128 f128_from_d64 (_Decimal128 d64) + { + return (__float128)d64; + } + __attribute__((noinline)) __float128 f128_from_d32 (_Decimal128 d32) + { + return (__float128)d32; + } + __attribute__((noinline)) _Decimal128 d128_from_f128 (__float128 f128) + { + return (_Decimal128)f128; + } + __attribute__((noinline)) _Decimal64 d64_from_f128 (__float128 f128) + { + return (_Decimal64)f128; + } + __attribute__((noinline)) _Decimal32 d32_from_f128 (__float128 f128) + { + return (_Decimal32)f128; + } + int main (void) + { + __float128 five = 5.0; + if (f128_from_d128 (5.0dl) != five + || f128_from_d64 (5.0dd) != five + || f128_from_d32 (5.0df) != five + || d128_from_f128 (five) != 5.0dl + || d64_from_f128 (five) != 5.0dd + || d32_from_f128 (five) != 5.0df) + abort (); + return 0; + }])], + [libgcc_cv_powerpc_float128_dec=yes], + [libgcc_cv_powerpc_float128_dec=no])]) CFLAGS="$saved_CFLAGS" esac |