[R] Add prefetcher compiler macros if supported

R-package/configure

@@ -646,6 +646,8 @@ ac_includes_default="\
 ac_header_cxx_list=
 ac_subst_vars='LTLIBOBJS
 LIBOBJS
+XGBOOST_MM_PREFETCH_PRESENT
+XGBOOST_BUILTIN_PREFETCH_PRESENT
 BACKTRACE_LIB
 DMLC_DEFS
 ENDIAN_FLAG
@@ -2794,11 +2796,11 @@ if test x$ac_prog_cxx_stdcxx = xno
 then :
   { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $CXX option to enable C++11 features" >&5
 printf %s "checking for $CXX option to enable C++11 features... " >&6; }
-if test ${ac_cv_prog_cxx_11+y}
+if test ${ac_cv_prog_cxx_cxx11+y}
 then :
   printf %s "(cached) " >&6
 else $as_nop
-  ac_cv_prog_cxx_11=no
+  ac_cv_prog_cxx_cxx11=no
 ac_save_CXX=$CXX
 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
@@ -2840,11 +2842,11 @@ if test x$ac_prog_cxx_stdcxx = xno
 then :
   { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $CXX option to enable C++98 features" >&5
 printf %s "checking for $CXX option to enable C++98 features... " >&6; }
-if test ${ac_cv_prog_cxx_98+y}
+if test ${ac_cv_prog_cxx_cxx98+y}
 then :
   printf %s "(cached) " >&6
 else $as_nop
-  ac_cv_prog_cxx_98=no
+  ac_cv_prog_cxx_cxx98=no
 ac_save_CXX=$CXX
 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
@@ -3238,6 +3240,64 @@ printf "%s\n" "$as_me: Forcing endianness to: ${USE_LITTLE_ENDIAN}" >&6;}
 
 fi
 
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: Checking for prefetch builtin" >&5
+printf "%s\n" "$as_me: Checking for prefetch builtin" >&6;}
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+int
+main (void)
+{
+__builtin_prefetch
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_cxx_try_link "$LINENO"
+then :
+  XGBOOST_BUILTIN_PREFETCH_PRESENT="-DXGBOOST_BUILTIN_PREFETCH_PRESENT=1"
+else $as_nop
+  XGBOOST_BUILTIN_PREFETCH_PRESENT=""
+
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.beam \
+    conftest$ac_exeext conftest.$ac_ext
+if [ "$XGBOOST_BUILTIN_PREFETCH_PRESENT" = "" ]; then
+  echo "Has __builtin_prefetch"
+else
+  echo "Doesn't have __builtin_prefetch"
+fi
+
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: Checking for mm_prefetch" >&5
+printf "%s\n" "$as_me: Checking for mm_prefetch" >&6;}
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <xmmintrin.h>
+int
+main (void)
+{
+_mm_prefetch
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_cxx_try_link "$LINENO"
+then :
+  XGBOOST_MM_PREFETCH_PRESENT="-DXGBOOST_MM_PREFETCH_PRESENT=1"
+else $as_nop
+  XGBOOST_MM_PREFETCH_PRESENT=""
+
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.beam \
+    conftest$ac_exeext conftest.$ac_ext
+if [ "$XGBOOST_MM_PREFETCH_PRESENT" = "" ]; then
+  echo "Has _mm_prefetch"
+else
+  echo "Doesn't have _mm_prefetch"
+fi
+
 OPENMP_CXXFLAGS=""
 
 if test `uname -s` = "Linux"
@@ -3289,6 +3349,8 @@ fi
 
 
 
+
+
 ac_config_files="$ac_config_files src/Makevars"
 
 ac_config_headers="$ac_config_headers config.h"

R-package/configure.ac

@@ -50,6 +50,36 @@ AS_IF([test -z "${USE_LITTLE_ENDIAN+x}"], [
   ENDIAN_FLAG="-DDMLC_CMAKE_LITTLE_ENDIAN=${USE_LITTLE_ENDIAN}"
 ])
 
+AC_MSG_NOTICE([Checking for prefetch builtin])
+AC_LINK_IFELSE(
+  [AC_LANG_PROGRAM(
+    [],
+    [__builtin_prefetch]
+  )],
+  [XGBOOST_BUILTIN_PREFETCH_PRESENT="-DXGBOOST_BUILTIN_PREFETCH_PRESENT=1"],
+  [XGBOOST_BUILTIN_PREFETCH_PRESENT=""]
+)
+if [[ "$XGBOOST_BUILTIN_PREFETCH_PRESENT" = "" ]]; then
+  echo "Has __builtin_prefetch"
+else
+  echo "Doesn't have __builtin_prefetch"
+fi
+
+AC_MSG_NOTICE([Checking for mm_prefetch])
+AC_LINK_IFELSE(
+  [AC_LANG_PROGRAM(
+    [#include <xmmintrin.h>],
+    [_mm_prefetch]
+  )],
+  [XGBOOST_MM_PREFETCH_PRESENT="-DXGBOOST_MM_PREFETCH_PRESENT=1"],
+  [XGBOOST_MM_PREFETCH_PRESENT=""]
+)
+if [[ "$XGBOOST_MM_PREFETCH_PRESENT" = "" ]]; then
+  echo "Has _mm_prefetch"
+else
+  echo "Doesn't have _mm_prefetch"
+fi
+
 OPENMP_CXXFLAGS=""
 
 if test `uname -s` = "Linux"
@@ -89,6 +119,8 @@ AC_SUBST(OPENMP_LIB)
 AC_SUBST(ENDIAN_FLAG)
 AC_SUBST(DMLC_DEFS)
 AC_SUBST(BACKTRACE_LIB)
+AC_SUBST(XGBOOST_BUILTIN_PREFETCH_PRESENT)
+AC_SUBST(XGBOOST_MM_PREFETCH_PRESENT)
 AC_CONFIG_FILES([src/Makevars])
 AC_CONFIG_HEADERS([config.h])
 AC_OUTPUT

R-package/src/Makevars.in

@@ -7,6 +7,8 @@ CXX_STD = CXX17
 
 XGB_RFLAGS = \
     @DMLC_DEFS@ \
+    @XGBOOST_BUILTIN_PREFETCH_PRESENT@ \
+    @XGBOOST_MM_PREFETCH_PRESENT@ \
     -DXGBOOST_STRICT_R_MODE=1 \
     -DDMLC_LOG_BEFORE_THROW=0 \
     -DDMLC_ENABLE_STD_THREAD=$(ENABLE_STD_THREAD) \