diff options
Diffstat (limited to 'config/c-compiler.m4')
| -rw-r--r-- | config/c-compiler.m4 | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/config/c-compiler.m4 b/config/c-compiler.m4 index 5be8f0f08dc..5db02b2ab75 100644 --- a/config/c-compiler.m4 +++ b/config/c-compiler.m4 @@ -661,3 +661,36 @@ if test x"$Ac_cachevar" = x"yes"; then fi undefine([Ac_cachevar])dnl ])# PGAC_ARMV8_CRC32C_INTRINSICS + +# PGAC_LOONGARCH_CRC32C_INTRINSICS +# --------------------------- +# Check if the compiler supports the LoongArch CRCC instructions, using +# __builtin_loongarch_crcc_w_b_w, __builtin_loongarch_crcc_w_h_w, +# __builtin_loongarch_crcc_w_w_w and __builtin_loongarch_crcc_w_d_w +# intrinsic functions. +# +# We test for the 8-byte variant since platforms capable of running +# Postgres are 64-bit only (as of PG17), and we know CRC instructions +# are available there without a runtime check. +# +# If the intrinsics are supported, sets pgac_loongarch_crc32c_intrinsics. +AC_DEFUN([PGAC_LOONGARCH_CRC32C_INTRINSICS], +[define([Ac_cachevar], [AS_TR_SH([pgac_cv_loongarch_crc32c_intrinsics])])dnl +AC_CACHE_CHECK( + [for __builtin_loongarch_crcc_w_b_w, __builtin_loongarch_crcc_w_h_w, __builtin_loongarch_crcc_w_w_w and __builtin_loongarch_crcc_w_d_w], + [Ac_cachevar], +[AC_LINK_IFELSE([AC_LANG_PROGRAM([], + [unsigned int crc = 0; + crc = __builtin_loongarch_crcc_w_b_w(0, crc); + crc = __builtin_loongarch_crcc_w_h_w(0, crc); + crc = __builtin_loongarch_crcc_w_w_w(0, crc); + crc = __builtin_loongarch_crcc_w_d_w(0, crc); + /* return computed value, to prevent the above being optimized away */ + return crc == 0;])], + [Ac_cachevar=yes], + [Ac_cachevar=no])]) +if test x"$Ac_cachevar" = x"yes"; then + pgac_loongarch_crc32c_intrinsics=yes +fi +undefine([Ac_cachevar])dnl +])# PGAC_LOONGARCH_CRC32C_INTRINSICS |