Add optimized BGEMM kernel for NEOVERSEV1 target

benchmark/Makefile

@@ -1,3 +1,31 @@
+###############################################################################
+# Copyright (c) 2025, The OpenBLAS Project
+# All rights reserved.
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+# 3. Neither the name of the OpenBLAS project nor the names of
+#    its contributors may be used to endorse or promote products
+#    derived from this software without specific prior written permission.
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED. IN NO EVENT SHALL THE OPENBLAS PROJECT OR CONTRIBUTORS BE
+# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+###############################################################################
+
 TOPDIR	= ..
 include $(TOPDIR)/Makefile.system
 
@@ -56,7 +84,7 @@ GOTO_LAPACK_TARGETS=
 endif
 
 ifeq ($(BUILD_BFLOAT16),1)
-GOTO_BFLOAT_TARGETS=sbgemm.goto
+GOTO_BFLOAT_TARGETS=bgemm.goto sbgemm.goto
 else
 GOTO_BFLOAT_TARGETS=
 endif
@@ -635,6 +663,8 @@ zcholesky.essl : zcholesky.$(SUFFIX)
 
 ##################################### Sgemm ####################################################
 ifeq ($(BUILD_BFLOAT16),1)
+bgemm.goto : bgemm.$(SUFFIX) ../$(LIBNAME)
+	$(CC) $(CFLAGS) -o $(@F) $^ $(CEXTRALIB) $(EXTRALIB) $(FEXTRALIB) -lm
 sbgemm.goto : sbgemm.$(SUFFIX) ../$(LIBNAME)
 	$(CC) $(CFLAGS) -o $(@F) $^ $(CEXTRALIB) $(EXTRALIB) $(FEXTRALIB) -lm
 endif
@@ -2970,6 +3000,8 @@ zcholesky.$(SUFFIX) : cholesky.c
 	$(CC) $(CFLAGS) -c -DCOMPLEX -DDOUBLE -o $(@F) $^
 
 ifeq ($(BUILD_BFLOAT16),1)
+bgemm.$(SUFFIX) : gemm.c
+	$(CC) $(CFLAGS) -c -DBFLOAT16 -DBGEMM -UCOMPLEX -UDOUBLE -o $(@F) $^
 sbgemm.$(SUFFIX) : gemm.c
 	$(CC) $(CFLAGS) -c -DBFLOAT16 -UCOMPLEX -UDOUBLE -o $(@F) $^
 endif

benchmark/gemm.c

@@ -33,6 +33,8 @@ USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #ifdef DOUBLE
 #define GEMM   BLASFUNC(dgemm)
+#elif defined(BFLOAT16) && defined(BGEMM)
+#define GEMM   BLASFUNC(bgemm)
 #elif defined(BFLOAT16)
 #define GEMM   BLASFUNC(sbgemm)
 #undef IFLOAT
@@ -60,8 +62,18 @@ int main(int argc, char *argv[]){
 
   IFLOAT *a, *b;
   FLOAT *c;
+#ifdef BGEMM
+  blasint one=1;
+  blasint two=2;
+  float alpha_in[] = {1.0, 0.0};
+  float beta_in[] = {0.0, 0.0};
+  FLOAT alpha[2], beta[2];
+  sbstobf16_(&two, alpha_in, &one, alpha, &one);
+  sbstobf16_(&two, beta_in, &one, beta, &one);
+#else
   FLOAT alpha[] = {1.0, 0.0};
   FLOAT beta [] = {0.0, 0.0};
+#endif
   char transa = 'N';
   char transb = 'N';
   blasint m, n, k, i, j, lda, ldb, ldc;

common_b.h

@@ -30,10 +30,16 @@
 #define COMMON_B_H
 
 #ifndef DYNAMIC_ARCH
-#define BGEMM_ONCOPY bgemm_oncopy
-#define BGEMM_OTCOPY bgemm_otcopy
-#define BGEMM_INCOPY bgemm_incopy
-#define BGEMM_ITCOPY bgemm_itcopy
+#define	BGEMM_ONCOPY		bgemm_oncopy
+#define	BGEMM_OTCOPY		bgemm_otcopy
+
+#if BGEMM_DEFAULT_UNROLL_M == BGEMM_DEFAULT_UNROLL_N
+#define	BGEMM_INCOPY		bgemm_oncopy
+#define	BGEMM_ITCOPY		bgemm_otcopy
+#else
+#define	BGEMM_INCOPY		bgemm_incopy
+#define	BGEMM_ITCOPY		bgemm_itcopy
+#endif
 
 #define BGEMM_BETA bgemm_beta
 #define BGEMM_KERNEL bgemm_kernel

interface/Makefile

@@ -1,3 +1,31 @@
+###############################################################################
+# Copyright (c) 2025, The OpenBLAS Project
+# All rights reserved.
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+# 3. Neither the name of the OpenBLAS project nor the names of
+#    its contributors may be used to endorse or promote products
+#    derived from this software without specific prior written permission.
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED. IN NO EVENT SHALL THE OPENBLAS PROJECT OR CONTRIBUTORS BE
+# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+###############################################################################
+
 TOPDIR	= ..
 include $(TOPDIR)/Makefile.system
 
@@ -526,7 +554,7 @@ ifneq ($(BUILD_COMPLEX16),1)
 	ZBLASOBJS=
 endif
 
-FUNCOBJS    = $(SBEXTOBJS) $(CXERBLAOBJS) $(SBBLASOBJS) $(SBLASOBJS) $(DBLASOBJS) $(CBLASOBJS) $(ZBLASOBJS) $(SHBLASOBJS)
+FUNCOBJS    = $(SBEXTOBJS) $(CXERBLAOBJS) $(BBLASOBJS) $(SBBLASOBJS) $(SBLASOBJS) $(DBLASOBJS) $(CBLASOBJS) $(ZBLASOBJS) $(SHBLASOBJS)
 
 ifeq ($(EXPRECISION), 1)
 FUNCOBJS   += $(QBLASOBJS) $(XBLASOBJS)

kernel/Makefile.L3

@@ -674,6 +674,10 @@ ZBLASOBJS += \
 endif
 
 ifeq ($(BUILD_BFLOAT16), 1)
+BGEMMINCOPYOBJ_P = $(BGEMMINCOPYOBJ:.$(SUFFIX)=.$(PSUFFIX))
+BGEMMITCOPYOBJ_P = $(BGEMMITCOPYOBJ:.$(SUFFIX)=.$(PSUFFIX))
+BGEMMONCOPYOBJ_P = $(BGEMMONCOPYOBJ:.$(SUFFIX)=.$(PSUFFIX))
+BGEMMOTCOPYOBJ_P = $(BGEMMOTCOPYOBJ:.$(SUFFIX)=.$(PSUFFIX))
 SBGEMMINCOPYOBJ_P = $(SBGEMMINCOPYOBJ:.$(SUFFIX)=.$(PSUFFIX))
 SBGEMMITCOPYOBJ_P = $(SBGEMMITCOPYOBJ:.$(SUFFIX)=.$(PSUFFIX))
 SBGEMMONCOPYOBJ_P = $(SBGEMMONCOPYOBJ:.$(SUFFIX)=.$(PSUFFIX))
@@ -2998,6 +3002,20 @@ $(KDIR)xgemm_beta$(TSUFFIX).$(PSUFFIX) : $(KERNELDIR)/$(XGEMM_BETA)
 
 
 ifeq ($(BUILD_BFLOAT16), 1)
+$(BGEMMONCOPYOBJ_P) : $(KERNELDIR)/$(BGEMMONCOPY)
+	$(CC) $(PFLAGS) -c -DBFLOAT16 -DBGEMM -UDOUBLE -UCOMPLEX $< -o $@
+
+$(BGEMMOTCOPYOBJ_P) : $(KERNELDIR)/$(BGEMMOTCOPY)
+	$(CC) $(PFLAGS) -c -DBFLOAT16 -DBGEMM -UDOUBLE -UCOMPLEX $< -o $@
+
+ifneq ($(BGEMM_UNROLL_M), $(BGEMM_UNROLL_N))
+$(BGEMMINCOPYOBJ_P) : $(KERNELDIR)/$(BGEMMINCOPY)
+	$(CC) $(PFLAGS) -c -DBFLOAT16 -DBGEMM -UDOUBLE -UCOMPLEX $< -o $@
+
+$(BGEMMITCOPYOBJ_P) : $(KERNELDIR)/$(BGEMMITCOPY)
+	$(CC) $(PFLAGS) -c -DBFLOAT16 -DBGEMM -UDOUBLE -UCOMPLEX $< -o $@
+endif
+
 $(SBGEMMONCOPYOBJ_P) : $(KERNELDIR)/$(SBGEMMONCOPY)
 	$(CC) $(PFLAGS) -c -DBFLOAT16 -UDOUBLE -UCOMPLEX $< -o $@
 
@@ -3010,7 +3028,6 @@ $(SBGEMMINCOPYOBJ_P) : $(KERNELDIR)/$(SBGEMMINCOPY)
 
 $(SBGEMMITCOPYOBJ_P) : $(KERNELDIR)/$(SBGEMMITCOPY)
 	$(CC) $(PFLAGS) -c -DBFLOAT16 -UDOUBLE -UCOMPLEX $< -o $@
-
 endif
 endif
 
@@ -3137,6 +3154,8 @@ endif
 
 
 ifeq ($(BUILD_BFLOAT16), 1)
+$(KDIR)bgemm_kernel$(TSUFFIX).$(PSUFFIX) : $(KERNELDIR)/$(BGEMMKERNEL) $(BGEMMDEPEND)
+	$(CC) $(PFLAGS) -c -DBFLOAT16 -DBGEMM -UDOUBLE -UCOMPLEX $< -o $@
 $(KDIR)sbgemm_kernel$(TSUFFIX).$(PSUFFIX) : $(KERNELDIR)/$(SBGEMMKERNEL) $(SBGEMMDEPEND)
 	$(CC) $(PFLAGS) -c -DBFLOAT16 -UDOUBLE -UCOMPLEX $< -o $@
 endif

kernel/arm64/KERNEL.NEOVERSEV1

@@ -1,10 +1,51 @@
+###############################################################################
+# Copyright (c) 2025, The OpenBLAS Project
+# All rights reserved.
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+# 3. Neither the name of the OpenBLAS project nor the names of
+#    its contributors may be used to endorse or promote products
+#    derived from this software without specific prior written permission.
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED. IN NO EVENT SHALL THE OPENBLAS PROJECT OR CONTRIBUTORS BE
+# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+###############################################################################
+
 include $(KERNELDIR)/KERNEL.ARMV8SVE
 
 SGEMVNKERNEL = gemv_n_sve_v1x3.c
 DGEMVNKERNEL = gemv_n_sve_v1x3.c
 SGEMVTKERNEL = gemv_t_sve_v1x3.c
 DGEMVTKERNEL = gemv_t_sve_v1x3.c
 ifeq ($(BUILD_BFLOAT16), 1)
+BGEMM_BETA    =  bgemm_beta_neon.c
+BGEMMKERNEL    = bgemm_kernel_$(BGEMM_UNROLL_M)x$(BGEMM_UNROLL_N)_neoversev1.c
+ifneq ($(BGEMM_UNROLL_M), $(BGEMM_UNROLL_N))
+BGEMMINCOPY    = sbgemm_ncopy_$(SBGEMM_UNROLL_M)_neoversev1.c
+BGEMMITCOPY    = sbgemm_tcopy_$(SBGEMM_UNROLL_M)_neoversev1.c
+BGEMMINCOPYOBJ =  bgemm_incopy$(TSUFFIX).$(SUFFIX)
+BGEMMITCOPYOBJ =  bgemm_itcopy$(TSUFFIX).$(SUFFIX)
+endif
+BGEMMONCOPY    = sbgemm_ncopy_$(BGEMM_UNROLL_N)_neoversev1.c
+BGEMMOTCOPY    = sbgemm_tcopy_$(BGEMM_UNROLL_N)_neoversev1.c
+BGEMMONCOPYOBJ =  bgemm_oncopy$(TSUFFIX).$(SUFFIX)
+BGEMMOTCOPYOBJ =  bgemm_otcopy$(TSUFFIX).$(SUFFIX)
+
 SBGEMM_BETA    =  sbgemm_beta_neoversev1.c
 SBGEMMKERNEL    = sbgemm_kernel_$(SBGEMM_UNROLL_M)x$(SBGEMM_UNROLL_N)_neoversev1.c
 ifneq ($(SBGEMM_UNROLL_M), $(SBGEMM_UNROLL_N))
@@ -21,4 +62,4 @@ SBGEMMOTCOPYOBJ =  sbgemm_otcopy$(TSUFFIX).$(SUFFIX)
 SBGEMVNKERNEL = sbgemv_n_neon.c
 SBGEMVTKERNEL = sbgemv_t_bfdot.c
 
-endif
+endif

kernel/arm64/bgemm_beta_neon.c

@@ -0,0 +1,107 @@
+/***************************************************************************
+ * Copyright (c) 2025, The OpenBLAS Project
+ * All rights reserved.
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ * 3. Neither the name of the OpenBLAS project nor the names of
+ * its contributors may be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE OPENBLAS PROJECT OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ * *****************************************************************************/
+
+#include "common.h"
+
+#include <arm_neon.h>
+
+int CNAME(BLASLONG m, BLASLONG n, BLASLONG dummy1, FLOAT beta_in, IFLOAT *dummy2,
+          BLASLONG dummy3, IFLOAT *dummy4, BLASLONG dummy5, FLOAT *c,
+          BLASLONG ldc) {
+    BLASLONG i, j;
+    BLASLONG chunk, remain;
+
+    bfloat16_t *ptr_c, *ptr_c0;
+
+    bfloat16x8_t x0, z0;
+    float32x4_t y0, y1;
+
+    float x;
+    bfloat16_t z;
+
+    bfloat16_t zero_bf16 = vcvth_bf16_f32(0.0f); 
+    bfloat16x8_t zeros = vdupq_n_bf16(zero_bf16);
+
+    bfloat16_t beta_bf16;
+    memcpy(&beta_bf16, &beta_in, sizeof(bfloat16_t));
+    float beta = vcvtah_f32_bf16(beta_bf16);
+    float32x4_t beta_neon = vdupq_n_f32(beta);
+
+    ptr_c = (bfloat16_t *)c;
+
+    chunk = m >> 3;
+    remain = m & 7;
+
+    if (beta == 0.0f){
+      for (j = 0; j < n; j ++){
+        ptr_c0 = ptr_c;
+        ptr_c += ldc;
+
+        for (i = 0; i < chunk; i ++){
+          vst1q_bf16(ptr_c0, zeros);
+          ptr_c0 += 8;
+        }
+
+        for (i = 0; i < remain; i ++){
+          ptr_c0[0] = zero_bf16;
+          ptr_c0 ++;
+        }
+      }
+    } else {
+      for (j = 0; j < n; j ++){
+        ptr_c0 = ptr_c;
+        ptr_c += ldc;
+
+        for (i = 0; i < chunk; i ++){
+          x0 = vld1q_bf16(ptr_c0);
+
+          y0 = vcvtq_low_f32_bf16(x0);
+          y1 = vcvtq_high_f32_bf16(x0);
+
+          y0 = vmulq_f32(y0, beta_neon);
+          y1 = vmulq_f32(y1, beta_neon);
+
+          z0 = vcvtq_low_bf16_f32(y0);
+          z0 = vcvtq_high_bf16_f32(z0, y1);
+
+          vst1q_bf16(ptr_c0, z0);
+
+          ptr_c0 += 8;
+        }
+
+        for (i = 0; i < remain; i ++){
+          x = vcvtah_f32_bf16(ptr_c0[0]);
+          z = vcvth_bf16_f32(x * beta);
+
+          ptr_c0[0] = z;
+          ptr_c0 ++;
+        }
+      } 
+    }
+    return 0;
+};