Implement intSimdMatrixAVX512VNNI (dummy)

This dummy implementation just copied the code from AVX2.

Signed-off-by: Stefan Weil <sw@weilnetz.de>

Author: stweil

Makefile.am

@@ -170,6 +170,14 @@ libtesseract_la_LIBADD += libtesseract_avx512.la
 noinst_LTLIBRARIES += libtesseract_avx512.la
 endif
 
+if HAVE_AVX512VNNI
+libtesseract_avx512vnni_la_CXXFLAGS = -march=icelake-client
+libtesseract_avx512vnni_la_CXXFLAGS += -I$(top_srcdir)/src/ccutil
+libtesseract_avx512vnni_la_SOURCES = src/arch/intsimdmatrixavx512vnni.cpp
+libtesseract_la_LIBADD += libtesseract_avx512vnni.la
+noinst_LTLIBRARIES += libtesseract_avx512vnni.la
+endif
+
 if HAVE_FMA
 libtesseract_fma_la_CXXFLAGS = -mfma
 libtesseract_fma_la_CXXFLAGS += -I$(top_srcdir)/src/ccutil

configure.ac

@@ -130,6 +130,7 @@ AX_CHECK_COMPILE_FLAG([-Werror=unused-command-line-argument], [WERROR=-Werror=un
 AM_CONDITIONAL([HAVE_AVX], false)
 AM_CONDITIONAL([HAVE_AVX2], false)
 AM_CONDITIONAL([HAVE_AVX512F], false)
+AM_CONDITIONAL([HAVE_AVX512VNNI], false)
 AM_CONDITIONAL([HAVE_FMA], false)
 AM_CONDITIONAL([HAVE_SSE4_1], false)
 AM_CONDITIONAL([HAVE_NEON], false)
@@ -156,6 +157,12 @@ case "${host_cpu}" in
       AC_DEFINE([HAVE_AVX512F], [1], [Enable AVX512F instructions])
     fi
 
+    AX_CHECK_COMPILE_FLAG([-march=icelake-client], [avx512vnni=true], [avx512vnni=false], [$WERROR])
+    AM_CONDITIONAL([HAVE_AVX512VNNI], $avx512vnni)
+    if $avx512vnni; then
+      AC_DEFINE([HAVE_AVX512VNNI], [1], [Enable AVX512VNNI instructions])
+    fi
+
     AX_CHECK_COMPILE_FLAG([-mfma], [fma=true], [fma=false], [$WERROR])
     AM_CONDITIONAL([HAVE_FMA], $fma)
     if $fma; then

src/arch/intsimdmatrix.h

@@ -117,6 +117,7 @@ struct TESS_API IntSimdMatrix {
   static const IntSimdMatrix intSimdMatrixNEON;
   // Only available with AVX2 / AVX / FMA / SSE.
   static const IntSimdMatrix intSimdMatrixAVX2;
+  static const IntSimdMatrix intSimdMatrixAVX512VNNI;
   static const IntSimdMatrix intSimdMatrixSSE;
 };