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optimized sgemv_n kernel for sandybridge
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Lines changed: 100 additions & 1 deletion

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‎kernel/x86_64/KERNEL.SANDYBRIDGE‎

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@@ -2,7 +2,7 @@ ifdef OS_WINDOWS
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SGEMVNKERNEL = ../arm/gemv_n.c
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SGEMVTKERNEL = ../arm/gemv_t.c
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else
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SGEMVNKERNEL = sgemv_n_avx.c
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SGEMVNKERNEL = sgemv_n.c
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SGEMVTKERNEL = sgemv_t_avx.c
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endif
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‎kernel/x86_64/sgemv_n.c‎

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@@ -33,6 +33,8 @@ USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#include "sgemv_n_microk_bulldozer-2.c"
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#elif defined(HASWELL)
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#include "sgemv_n_microk_haswell-2.c"
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#elif defined(SANDYBRIDGE)
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#include "sgemv_n_microk_sandy-2.c"
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#endif
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‎kernel/x86_64/sgemv_n_microk_sandy-2.c‎

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/***************************************************************************
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Copyright (c) 2014, The OpenBLAS Project
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are
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met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the
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distribution.
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3. Neither the name of the OpenBLAS project nor the names of
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its contributors may be used to endorse or promote products
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derived from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE OPENBLAS PROJECT OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
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USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*****************************************************************************/
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#define HAVE_KERNEL_16x4 1
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static void sgemv_kernel_16x4( long n, float **ap, float *x, float *y) __attribute__ ((noinline));
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static void sgemv_kernel_16x4( long n, float **ap, float *x, float *y)
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{
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long register i = 0;
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__asm__ __volatile__
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(
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"vzeroupper \n\t"
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"vbroadcastss (%2), %%ymm12 \n\t" // x0
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"vbroadcastss 4(%2), %%ymm13 \n\t" // x1
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"vbroadcastss 8(%2), %%ymm14 \n\t" // x2
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"vbroadcastss 12(%2), %%ymm15 \n\t" // x3
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".align 16 \n\t"
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".L01LOOP%=: \n\t"
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"vmovups (%3,%0,4), %%ymm4 \n\t" // 8 * y
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"vmovups 32(%3,%0,4), %%ymm5 \n\t" // 8 * y
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"prefetcht0 192(%4,%0,4) \n\t"
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"vmulps (%4,%0,4), %%ymm12, %%ymm8 \n\t"
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"vaddps %%ymm4, %%ymm8 , %%ymm4 \n\t"
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"vmulps 32(%4,%0,4), %%ymm12, %%ymm9 \n\t"
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"vaddps %%ymm5, %%ymm9 , %%ymm5 \n\t"
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"prefetcht0 192(%5,%0,4) \n\t"
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"vmulps (%5,%0,4), %%ymm13, %%ymm10 \n\t"
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"vaddps %%ymm4, %%ymm10, %%ymm4 \n\t"
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"vmulps 32(%5,%0,4), %%ymm13, %%ymm11 \n\t"
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"vaddps %%ymm5, %%ymm11, %%ymm5 \n\t"
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"prefetcht0 192(%6,%0,4) \n\t"
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"vmulps (%6,%0,4), %%ymm14, %%ymm8 \n\t"
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"vaddps %%ymm4, %%ymm8 , %%ymm4 \n\t"
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"vmulps 32(%6,%0,4), %%ymm14, %%ymm9 \n\t"
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"vaddps %%ymm5, %%ymm9 , %%ymm5 \n\t"
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"prefetcht0 192(%7,%0,4) \n\t"
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"vmulps (%7,%0,4), %%ymm15, %%ymm10 \n\t"
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"vaddps %%ymm4, %%ymm10, %%ymm4 \n\t"
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"vmulps 32(%7,%0,4), %%ymm15, %%ymm11 \n\t"
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"vaddps %%ymm5, %%ymm11, %%ymm5 \n\t"
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"vmovups %%ymm4, (%3,%0,4) \n\t" // 8 * y
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"vmovups %%ymm5, 32(%3,%0,4) \n\t" // 8 * y
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"addq $16, %0 \n\t"
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"subq $16, %1 \n\t"
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"jnz .L01LOOP%= \n\t"
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"vzeroupper \n\t"
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:
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:
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"r" (i), // 0
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"r" (n), // 1
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"r" (x), // 2
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"r" (y), // 3
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"r" (ap[0]), // 4
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"r" (ap[1]), // 5
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"r" (ap[2]), // 6
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"r" (ap[3]) // 7
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: "cc",
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"%xmm4", "%xmm5",
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"%xmm8", "%xmm9", "%xmm10", "%xmm11",
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"%xmm12", "%xmm13", "%xmm14", "%xmm15",
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"memory"
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);
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}
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