static inline uint32_t s_crc32c_sse42_clmul_256()

in source/intel/asm/crc32c_sse42_asm.c [54:116]

• 43 lines of code
• 1 McCabe index (conditional complexity)

static inline uint32_t s_crc32c_sse42_clmul_256(const uint8_t *input, uint32_t crc) {
    __asm__ __volatile__(
        "enter_256_%=:"

        "xor          %%r11, %%r11    # zero all 64 bits in r11, will track crc1 \n"
        "xor          %%r10, %%r10    # zero all 64 bits in r10, will track crc2 \n"

        "crc32q    0(%[in]), %%rcx    # crc0 \n"
        "crc32q   88(%[in]), %%r11    # crc1 \n"
        "crc32q  176(%[in]), %%r10    # crc2 \n"

        "crc32q    8(%[in]), %%rcx    # crc0 \n"
        "crc32q   96(%[in]), %%r11    # crc1 \n"
        "crc32q  184(%[in]), %%r10    # crc2 \n"

        "crc32q   16(%[in]), %%rcx    # crc0 \n"
        "crc32q  104(%[in]), %%r11    # crc1 \n"
        "crc32q  192(%[in]), %%r10    # crc2 \n"

        "crc32q   24(%[in]), %%rcx    # crc0 \n"
        "crc32q  112(%[in]), %%r11    # crc1 \n"
        "crc32q  200(%[in]), %%r10    # crc2 \n"

        "crc32q   32(%[in]), %%rcx    # crc0 \n"
        "crc32q  120(%[in]), %%r11    # crc1 \n"
        "crc32q  208(%[in]), %%r10    # crc2 \n"

        "crc32q   40(%[in]), %%rcx    # crc0 \n"
        "crc32q  128(%[in]), %%r11    # crc1 \n"
        "crc32q  216(%[in]), %%r10    # crc2 \n"

        "crc32q   48(%[in]), %%rcx    # crc0 \n"
        "crc32q  136(%[in]), %%r11    # crc1 \n"
        "crc32q  224(%[in]), %%r10    # crc2 \n"

        "crc32q   56(%[in]), %%rcx    # crc0 \n"
        "crc32q  144(%[in]), %%r11    # crc1 \n"
        "crc32q  232(%[in]), %%r10    # crc2 \n"

        "crc32q   64(%[in]), %%rcx    # crc0 \n"
        "crc32q  152(%[in]), %%r11    # crc1 \n"
        "crc32q  240(%[in]), %%r10    # crc2 \n"

        "crc32q   72(%[in]), %%rcx    # crc0 \n"
        "crc32q  160(%[in]), %%r11    # crc1 \n"
        "crc32q  248(%[in]), %%r10    # crc2 \n"

        "crc32q   80(%[in]), %%rcx    # crc0 \n"
        "crc32q  168(%[in]), %%r11    # crc2 \n"

        FOLD_K1K2(256, $0x1b3d8f29, $0x39d3b296) /* Magic Constants used to fold crc stripes into ecx */

        /* output registers
         [crc] is an input and and output so it is marked read/write (i.e. "+c")*/
        : "+c"(crc)

        /* input registers */
        : [ crc ] "c"(crc), [ in ] "d"(input)

        /* additional clobbered registers */
        : "%r8", "%r9", "%r11", "%r10", "%xmm1", "%xmm2", "%xmm3", "%xmm4", "cc");
    return crc;
}