函数源码

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source File:lib\raid6\sse1.c Create Date:2022-07-27 08:07:27
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/*
 * Plain SSE1 implementation
 */
static void raid6_sse11_gen_syndrome(int disks, size_t bytes, void **ptrs)
{
    u8 **dptr = (u8 **)ptrs;
    u8 *p, *q;
    int d, z, z0;
 
    z0 = disks - 3;     /* Highest data disk */
    p = dptr[z0+1];     /* XOR parity */
    q = dptr[z0+2];     /* RS syndrome */
 
    kernel_fpu_begin();
 
    asm volatile("movq %0,%%mm0" : : "m" (raid6_mmx_constants.x1d));
    asm volatile("pxor %mm5,%mm5"); /* Zero temp */
 
    for ( d = 0 ; d < bytes ; d += 8 ) {
        asm volatile("prefetchnta %0" : : "m" (dptr[z0][d]));
        asm volatile("movq %0,%%mm2" : : "m" (dptr[z0][d])); /* P[0] */
        asm volatile("prefetchnta %0" : : "m" (dptr[z0-1][d]));
        asm volatile("movq %mm2,%mm4"); /* Q[0] */
        asm volatile("movq %0,%%mm6" : : "m" (dptr[z0-1][d]));
        for ( z = z0-2 ; z >= 0 ; z-- ) {
            asm volatile("prefetchnta %0" : : "m" (dptr[z][d]));
            asm volatile("pcmpgtb %mm4,%mm5");
            asm volatile("paddb %mm4,%mm4");
            asm volatile("pand %mm0,%mm5");
            asm volatile("pxor %mm5,%mm4");
            asm volatile("pxor %mm5,%mm5");
            asm volatile("pxor %mm6,%mm2");
            asm volatile("pxor %mm6,%mm4");
            asm volatile("movq %0,%%mm6" : : "m" (dptr[z][d]));
        }
        asm volatile("pcmpgtb %mm4,%mm5");
        asm volatile("paddb %mm4,%mm4");
        asm volatile("pand %mm0,%mm5");
        asm volatile("pxor %mm5,%mm4");
        asm volatile("pxor %mm5,%mm5");
        asm volatile("pxor %mm6,%mm2");
        asm volatile("pxor %mm6,%mm4");
 
        asm volatile("movntq %%mm2,%0" : "=m" (p[d]));
        asm volatile("movntq %%mm4,%0" : "=m" (q[d]));
    }
 
    asm volatile("sfence" : : : "memory");
    kernel_fpu_end();
}