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optimizations via software prefetches

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wjc404 2019-11-04 19:37:19 +08:00 committed by GitHub
parent ae43b75a6a
commit fbacd2605d
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 13 additions and 7 deletions
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20
kernel/x86_64/sgemm_kernel_16x4_skylakex_2.c
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@ -42,7 +42,6 @@
#define unit_save_m16n2(c1,c2) \
"vunpcklps "#c2","#c1",%%zmm6; vunpckhps "#c2","#c1",%%zmm7; vunpcklpd %%zmm7,%%zmm6,%%zmm4; vunpckhpd %%zmm7,%%zmm6,%%zmm5;"\
"vfmadd213ps (%5),%%zmm0,%%zmm4; vfmadd213ps (%5,%3,1),%%zmm0,%%zmm5;"\
"prefetcht1 127(%5); prefetcht1 127(%5,%3,1);"\
"vmovups %%zmm4,(%5); vmovups %%zmm5,(%5,%3,1); leaq (%5,%3,2),%5;"
#define SAVE_h_m16n2 "movq %2,%5;" unit_save_m16n2(%%zmm8,%%zmm9)
#define SAVE_h_m16n4 SAVE_h_m16n2 unit_save_m16n2(%%zmm10,%%zmm11)
@ -54,19 +53,25 @@
#define SAVE_m16(ndim) SAVE_h_m16n##ndim "addq $64,%2;"
#define COMPUTE_m16(ndim) \
INIT_m16n##ndim\
"movq %%r13,%4; movq %%r14,%1; leaq (%1,%%r12,2),%%r15; addq %%r12,%%r15;"\
"cmpq $4,%4; jb "#ndim"016162f;"\
"movq %%r13,%4; movq %%r14,%1; leaq (%1,%%r12,2),%%r15; addq %%r12,%%r15; movq %2,%5;"\
"cmpq $16,%4; jb "#ndim"016162f;"\
#ndim"016161:\n\t"\
KERNEL_k1m16n##ndim\
KERNEL_k1m16n##ndim\
"prefetcht1 (%5); prefetcht1 63(%5); addq %3,%5;"\
KERNEL_k1m16n##ndim\
KERNEL_k1m16n##ndim\
"subq $4,%4; cmpq $4,%4; jnb "#ndim"016161b;"\
"prefetcht1 (%8); addq $"#ndim",%8;"\
"subq $4,%4; cmpq $16,%4; jnb "#ndim"016161b;"\
"movq %2,%5;"\
#ndim"016162:\n\t"\
"testq %4,%4; jz "#ndim"016163f;"\
"prefetcht0 (%5); prefetcht0 63(%5); prefetcht0 (%5,%3,1); prefetcht0 63(%5,%3,1);"\
KERNEL_k1m16n##ndim\
"leaq (%5,%3,2),%5;"\
"decq %4; jmp "#ndim"016162b;"\
#ndim"016163:\n\t"\
"prefetcht0 (%%r14); prefetcht0 64(%%r14);"\
SAVE_m16(ndim)
/* m = 8 *//* ymm0 for alpha, ymm1-ymm3 for temporary use, ymm4-ymm15 for accumulators */
@ -350,10 +355,11 @@
#define COMPUTE_m1(ndim) COMPUTE_m1_n##ndim
/* %0 = "+r"(a_pointer), %1 = "+r"(b_pointer), %2 = "+r"(c_pointer), %3 = "+r"(ldc_in_bytes), %4 = "+r"(K), %5 = "+r"(ctemp) */
/* %6 = "+r"(&alpha), %7 = "+r"(M) */
/* %6 = "+r"(&alpha), %7 = "+r"(M), %8 = "+r"(next_b) */
/* r11 = m(const), r12 = k << 4(const), r13 = k(const), r14 = b_head_pos(const), r15 = %1 + 3r12 */
#define COMPUTE(ndim) {\
next_b = b_pointer + ndim * K;\
__asm__ __volatile__(\
"vbroadcastss (%6),%%zmm0;"\
"movq %4,%%r13; movq %4,%%r12; salq $4,%%r12; movq %1,%%r14; movq %7,%%r11;"\
@ -378,7 +384,7 @@
COMPUTE_m1(ndim)\
"33105"#ndim":\n\t"\
"movq %%r13,%4; movq %%r14,%1; movq %%r11,%7;"\
:"+r"(a_pointer),"+r"(b_pointer),"+r"(c_pointer),"+r"(ldc_in_bytes),"+r"(K),"+r"(ctemp),"+r"(alp),"+r"(M)\
:"+r"(a_pointer),"+r"(b_pointer),"+r"(c_pointer),"+r"(ldc_in_bytes),"+r"(K),"+r"(ctemp),"+r"(alp),"+r"(M),"+r"(next_b)\
::"r11","r12","r13","r14","r15","zmm0","zmm1","zmm2","zmm3","zmm4","zmm5","zmm6","zmm7","zmm8","zmm9","zmm10","zmm11","zmm12","zmm13","zmm14",\
"zmm15","zmm16","zmm17","zmm18","zmm19","zmm20","zmm21","zmm22","zmm23","zmm24","zmm25","zmm26","zmm27","zmm28","zmm29","zmm30","zmm31",\
"cc","memory");\
@ -391,7 +397,7 @@ CNAME(BLASLONG m, BLASLONG n, BLASLONG k, float alpha, float * __restrict__ A, f
int64_t ldc_in_bytes = (int64_t)LDC * sizeof(float);float ALPHA = alpha;
int64_t M = (int64_t)m, K = (int64_t)k;
BLASLONG n_count = n;
float *a_pointer = A,*b_pointer = B,*c_pointer = C,*ctemp = C,*alp = &ALPHA;
float *a_pointer = A,*b_pointer = B,*c_pointer = C,*ctemp = C,*alp = &ALPHA,*next_b = B;
for(;n_count>23;n_count-=24) COMPUTE(24)
for(;n_count>19;n_count-=20) COMPUTE(20)
for(;n_count>15;n_count-=16) COMPUTE(16)