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Replace asm statements by C code to increase portability #205

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Replace asm statements by C code to increase portability #205

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30 changes: 21 additions & 9 deletions include/jellyfish/rectangular_binary_matrix.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -296,13 +296,20 @@ namespace jellyfish {
// #pragma GCC diagnostic pop

// i is the lower 2 bits of x, and an index into the smear array. Compute res ^= smear[i] & p[j].
#ifdef __x86_64__
#define AND_XOR(off) \
asm("movdqa (%[s],%[i]), %[load]\n\t" \
"pand " off "(%[p]),%[load]\n\t" \
"pand " #off "(%[p]),%[load]\n\t" \
"pxor %[load],%[acc]\n\t" \
: [acc]"=&x"(acc) \
: "[acc]"(acc), [i]"r"(i), [p]"r"(p), [s]"r"(smear), [load]"x"(load))

#else
#define AND_XOR(off) do { \
xmm_t a = { smear[i / 8], smear[i / 8 + 1] }; \
xmm_t b = { p[(off) / 8], p[(off) / 8 + 1] }; \
acc ^= a & b; \
} while (0)
#endif

uint64_t i, j = 0, x = 0;
for(unsigned int w = 0; w < nb_words(); ++w) {
Expand All @@ -314,16 +321,16 @@ namespace jellyfish {
}
for( ; j > 7; j -= 8, p -= 8) {
i = (x & (uint64_t)0x3) << 4;
AND_XOR("0x30");
AND_XOR(0x30);
x >>= 2;
i = (x & (uint64_t)0x3) << 4;
AND_XOR("0x20");
AND_XOR(0x20);
x >>= 2;
i = (x & (uint64_t)0x3) << 4;
AND_XOR("0x10");
AND_XOR(0x10);
x >>= 2;
i = (x & (uint64_t)0x3) << 4;
AND_XOR("");
AND_XOR(0);
x >>= 2;
}
}
Expand All @@ -333,25 +340,30 @@ namespace jellyfish {
switch(j) {
case 6:
i = (x & (uint64_t)0x3) << 4;
AND_XOR("0x20");
AND_XOR(0x20);
x >>= 2;
case 4:
i = (x & (uint64_t)0x3) << 4;
AND_XOR("0x10");
AND_XOR(0x10);
x >>= 2;
case 2:
i = (x & (uint64_t)0x3) << 4;
AND_XOR("");
AND_XOR(0);
}

// Get result out
#ifdef __x86_64__
uint64_t res1, res2;
asm("movd %[acc], %[res1]\n\t"
"psrldq $8, %[acc]\n\t"
"movd %[acc], %[res2]\n\t"
: [res1]"=r"(res1), [res2]"=r"(res2)
: [acc]"x"(acc));
return res1 ^ res2;
#else
return acc[0] ^ acc[1];
#endif

}
#endif // HAVE_SSE

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