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Use native CRC instructions on 64-bit LoongArch

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As with the Intel and Arm CRC instructions, compiler intrinsics for
them must be supported by the compiler. In contrast, no runtime check
is needed. Aligned memory access is faster, so use the Arm coding as
a model.

YANG Xudong

Discussion: https://postgr.es/m/b522a0c5-e3b2-99cc-6387-58134fb88cbe%40ymatrix.cn
This commit is contained in:
John Naylor
2023-08-10 11:36:15 +07:00
parent fa2e874946
commit 4d14ccd6af
8 changed files with 240 additions and 17 deletions
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24
meson.build
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@ -2065,6 +2065,30 @@ int main(void)
cdata.set('USE_ARMV8_CRC32C_WITH_RUNTIME_CHECK', 1)
have_optimized_crc = true
endif
elif host_cpu == 'loongarch64'
prog = '''
int main(void)
{
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;
}
'''
if cc.links(prog, name: '__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',
args: test_c_args)
# Use LoongArch CRC instruction unconditionally
cdata.set('USE_LOONGARCH_CRC32C', 1)
have_optimized_crc = true
endif
endif
if not have_optimized_crc