Add FP16 datatypes

.gitignore

@@ -300,6 +300,10 @@ ompi/mpiext/pcollreq/mpif-h/profile/pscan_init_f.c
 ompi/mpiext/pcollreq/mpif-h/profile/pscatter_init_f.c
 ompi/mpiext/pcollreq/mpif-h/profile/pscatterv_init_f.c
 
+ompi/mpiext/shortfloat/c/mpiext_shortfloat_c.h
+ompi/mpiext/shortfloat/mpif-h/mpiext_shortfloat_mpifh.h
+ompi/mpiext/shortfloat/use-mpi-f08/mpiext_shortfloat_usempif08.h
+
 ompi/tools/mpisync/mpisync
 ompi/tools/mpisync/mpirun_prof
 ompi/tools/mpisync/ompi_timing_post

README

@@ -886,6 +886,10 @@ Open MPI Extensions
     because they are not standardized yet.  Future versions of Open MPI
     will switch to the MPI_ prefix once the MPI Standard which includes
     this feature is published.  See their man page for more details.
+  - shortfloat: Provides MPI datatypes MPIX_C_FLOAT16, MPIX_SHORT_FLOAT,
+    MPIX_SHORT_FLOAT, and MPIX_CXX_SHORT_FLOAT_COMPLEX if corresponding
+    language types are available. See ompi/mpiext/shortfloat/README.txt
+    for details.
   - affinity: Provides the OMPI_Affinity_str() routine on retrieving
     a string that contains what resources a process is bound to.  See
     its man page for more details.

config/ompi_fortran_check.m4

@@ -129,9 +129,13 @@ AC_DEFUN([OMPI_FORTRAN_CHECK], [
             long*double)          ofc_type_kind=C_LONG_DOUBLE         ;;
             long*long)            ofc_type_kind=C_LONG_LONG           ;;
             short)                ofc_type_kind=C_SHORT               ;;
+            short*float)          ofc_type_kind=C_SHORT_FLOAT         ;;
+            short*float*_Complex) ofc_type_kind=C_SHORT_FLOAT_COMPLEX ;;
             float*_Complex)       ofc_type_kind=C_FLOAT_COMPLEX       ;;
             double*_Complex)      ofc_type_kind=C_DOUBLE_COMPLEX      ;;
             long*double*_Complex) ofc_type_kind=C_LONG_DOUBLE_COMPLEX ;;
+            opal_short_float_t)   ofc_type_kind=C_SHORT_FLOAT         ;;
+            opal_short_float_complex_t) ofc_type_kind=C_SHORT_FLOAT_COMPLEX ;;
             *)
                 # Skip types like "DOUBLE PRECISION"
                 ;;
@@ -142,8 +146,9 @@ AC_DEFUN([OMPI_FORTRAN_CHECK], [
 
             # See if the value is -1.  If so, then just say we don't
             # have a match.  If the compiler doesn't support
-            # ISO_C_BINDING, then we'll just fall back to a default
-            # kind and hope for the best.  :-\
+            # ISO_C_BINDING, C_SHORT_FLOAT, or C_SHORT_FLOAT_COMPLEX,
+            # then we'll just fall back to a default kind and hope
+            # for the best.  :-\
             OMPI_FORTRAN_GET_KIND_VALUE([$ofc_type_kind], 4, [ofc_type_kind_value])
             AS_IF([test $ofc_type_kind_value -le 0],
                   [ofc_have_type=0

config/ompi_setup_mpi_fortran.m4

@@ -18,6 +18,7 @@ dnl Copyright (c) 2009      Oak Ridge National Labs.  All rights reserved.
 dnl Copyright (c) 2014-2017 Research Organization for Information Science
 dnl                         and Technology (RIST). All rights reserved.
 dnl Copyright (c) 2016      IBM Corporation.  All rights reserved.
+dnl Copyright (c) 2018      FUJITSU LIMITED.  All rights reserved.
 dnl $COPYRIGHT$
 dnl
 dnl Additional copyrights may follow
@@ -168,25 +169,33 @@ AC_DEFUN([OMPI_SETUP_MPI_FORTRAN],[
                    [int, int64_t, long long, long], [16], [yes])
 
     OMPI_FORTRAN_CHECK([REAL], [yes],
-                   [float, double, long double], [-1], [yes])
+                   [short float, float, double, long double, opal_short_float_t],
+                   [-1], [yes])
     OMPI_FORTRAN_CHECK([REAL*2], [no],
-                   [float, double, long double], [2], [yes])
+                   [short float, float, double, long double, opal_short_float_t],
+                   [2], [yes])
     OMPI_FORTRAN_CHECK([REAL*4], [no],
-                   [float, double, long double], [4], [yes])
+                   [short float, float, double, long double, opal_short_float_t],
+                   [4], [yes])
     OMPI_FORTRAN_CHECK([REAL*8], [no],
-                   [float, double, long double], [8], [yes])
+                   [short float, float, double, long double, opal_short_float_t],
+                   [8], [yes])
     OMPI_FORTRAN_CHECK([REAL*16], [no],
-                   [float, double, long double], [16], [yes])
+                   [short float, float, double, long double, opal_short_float_t],
+                   [16], [yes])
 
     # In some compilers, the bit representation of REAL*16 is not the same
     # as the C counterpart that we found.  If this is the case, then we
     # want to disable reduction support for MPI_REAL16 (per ticket #1603).
     OMPI_FORTRAN_CHECK_REAL16_C_EQUIV
 
     OMPI_FORTRAN_CHECK([DOUBLE PRECISION], [yes],
-                   [float, double, long double], [-1], [yes])
+                   [short float, float, double, long double, opal_short_float_t],
+                   [-1], [yes])
 
-    OMPI_FORTRAN_CHECK([COMPLEX], [yes], [float _Complex, double _Complex], [-1], [no])
+    OMPI_FORTRAN_CHECK([COMPLEX], [yes],
+                   [short float _Complex, float _Complex, double _Complex, long double _Complex, opal_short_float_complex_t],
+                   [-1], [no])
 
     # The complex*N tests are a bit different (note: the complex tests are
     # the same as all the rest, because complex is a composite of two
@@ -199,21 +208,23 @@ AC_DEFUN([OMPI_SETUP_MPI_FORTRAN],[
     #    have a back-end C type for it)
     # b) compiler supports complex*N
 
-    OMPI_FORTRAN_CHECK([COMPLEX*4], [no], [float _Complex], [4], [no])
+    OMPI_FORTRAN_CHECK([COMPLEX*4], [no],
+                   [short float _Complex, float _Complex, double _Complex, long double _Complex, opal_short_float_complex_t],
+                   [4], [no])
     OMPI_FORTRAN_CHECK([COMPLEX*8], [no],
-                   [float _Complex, double _Complex, long double _Complex],
+                   [short float _Complex, float _Complex, double _Complex, long double _Complex, opal_short_float_complex_t],
                    [8], [no])
     OMPI_FORTRAN_CHECK([COMPLEX*16], [no],
-                   [float _Complex, double _Complex, long double _Complex],
+                   [short float _Complex, float _Complex, double _Complex, long double _Complex, opal_short_float_complex_t],
                    [16], [no])
     OMPI_FORTRAN_CHECK([COMPLEX*32], [no],
-                   [float _Complex, double _Complex, long double _Complex],
+                   [short float _Complex, float _Complex, double _Complex, long double _Complex, opal_short_float_complex_t],
                    [32], [no])
     # Double precision complex types are not standard, but many
     # compilers support it.  Code should be wrapped with #ifdef
     # OMPI_HAVE_FORTRAN_DOUBLE_COMPLEX
     OMPI_FORTRAN_CHECK([DOUBLE COMPLEX], [no],
-                   [float _Complex, double _Complex, long double _Complex],
+                   [short float _Complex, float _Complex, double _Complex, long double _Complex, opal_short_float_complex_t],
                    [-1], [no])
 
     # Regardless of whether we have fortran bindings, or even a

config/opal_check_alt_short_float.m4

@@ -0,0 +1,55 @@
+dnl -*- shell-script -*-
+dnl
+dnl Copyright (c) 2018      FUJITSU LIMITED.  All rights reserved.
+dnl $COPYRIGHT$
+dnl
+dnl Additional copyrights may follow
+dnl
+dnl $HEADER$
+dnl
+
+# Check whether the user wants to use an alternate type of C 'short float'.
+
+# OPAL_CHECK_ALT_SHORT_FLOAT
+# ------------------------------------------------------------
+AC_DEFUN([OPAL_CHECK_ALT_SHORT_FLOAT], [
+    AC_CHECK_TYPES(_Float16)
+    AC_MSG_CHECKING([if want alternate C type of short float])
+    AC_ARG_ENABLE(alt-short-float,
+        AC_HELP_STRING([--enable-alt-short-float=TYPE],
+                       [Use an alternate C type TYPE of 'short float' if 'short float' is not available on the C compiler. 'short float' is a new C type proposed for the next C language standard in ISO/IEC JTC 1/SC 22 WG 14 (C WG). (default: "_Float16" if available, disabled otherwise)]))
+    if test "$enable_alt_short_float" = "yes"; then
+        AC_MSG_ERROR([--enable-alt-short-float must have an argument.])
+    elif test "$enable_alt_short_float" = "no"; then
+        :
+    elif test "$enable_alt_short_float" != ""; then
+        opal_short_float_type="$enable_alt_short_float"
+        opal_short_float_complex_type="$enable_alt_short_float [[2]]"
+    elif test "$ac_cv_type_short_float" = "yes" && \
+         test "$ac_cv_type_short_float__Complex" = "yes"; then
+        opal_short_float_type="short float"
+        opal_short_float_complex_type="short float _Complex"
+    elif test "$ac_cv_type__Float16" = "yes"; then
+        opal_short_float_type="_Float16"
+        opal_short_float_complex_type="_Float16 [[2]]"
+    fi
+    if test "$opal_short_float_type" != ""; then
+        AC_MSG_RESULT([yes ($opal_short_float_type)])
+        AC_CHECK_TYPES($opal_short_float_type, [opal_enable_short_float=1], [opal_enable_short_float=0])
+        if test "$opal_enable_short_float" = 1; then
+            AC_DEFINE_UNQUOTED(opal_short_float_t, [[$opal_short_float_type]],
+                               [User-selected alternate C type of short float])
+            AC_DEFINE_UNQUOTED(opal_short_float_complex_t, [[$opal_short_float_complex_type]],
+                               [User-selected alternate C type of short float _Complex])
+            AC_CHECK_TYPES(opal_short_float_t)
+            AC_CHECK_TYPES(opal_short_float_complex_t)
+            AC_CHECK_SIZEOF(opal_short_float_t)
+            AC_CHECK_SIZEOF(opal_short_float_complex_t)
+            OPAL_C_GET_ALIGNMENT(opal_short_float_t, OPAL_ALIGNMENT_OPAL_SHORT_FLOAT_T)
+        elif test "$enable_alt_short_float" != ""; then
+            AC_MSG_ERROR([Alternate C type of short float $opal_short_float_type requested but not available.  Aborting])
+        fi
+    else
+        AC_MSG_RESULT([no])
+    fi
+])

configure.ac

@@ -25,6 +25,7 @@
 # Copyright (c) 2016-2017 IBM Corporation.  All rights reserved.
 # Copyright (c) 2018      Amazon.com, Inc. or its affiliates.
 #                         All Rights reserved.
+# Copyright (c) 2018      FUJITSU LIMITED.  All rights reserved.
 # $COPYRIGHT$
 #
 # Additional copyrights may follow
@@ -373,6 +374,27 @@ OPAL_CHECK_IDENT([CC], [CFLAGS], [c], [C])
 # Check for some types
 #
 
+# 'short float' support of the Intel C++ Compiler (group of C and C++
+# compilers), at least versions 18.0 and 19.0, is half-baked. It can
+# compile declarations of 'short float' variables and expressions of
+# 'sizeof(short float)' but cannot compile casts and operations of
+# 'short float' variables. In this situation, 'AC_CHECK_TYPES(short float)'
+# defines 'HAVE_SHORT_FLOAT' as 1 and compilation errors occur in
+# ompi/mca/op/base/op_base_functions.c. To avoid this error, check it
+# using 'AC_COMPILE_IFELSE' and set Autoconf cache variables before
+# 'AC_CHECK_TYPES(short float)'. This check can be removed when all
+# OMPI-supported Intel C++ Compilers support 'short float' completely
+# (or drop it completely).
+if test "$opal_cv_c_compiler_vendor" = "intel"; then
+    AC_MSG_CHECKING([if Intel compiler supports "short float" properly])
+    AC_COMPILE_IFELSE(
+        [AC_LANG_SOURCE([float f(short float a, short float b) { return (float)(a + b); }])],
+        [AC_MSG_RESULT([yes])],
+        [ac_cv_type_short_float="no"
+         ac_cv_type_short_float__Complex="no"]
+         AC_MSG_RESULT([no]))
+fi
+
 AC_CHECK_TYPES(int8_t)
 AC_CHECK_TYPES(uint8_t)
 AC_CHECK_TYPES(int16_t)
@@ -387,10 +409,12 @@ AC_CHECK_TYPES(uint128_t)
 AC_CHECK_TYPES(long long)
 
 AC_CHECK_TYPES(__float128)
+AC_CHECK_TYPES(short float)
 AC_CHECK_TYPES(long double)
 # We only need these types if we're building the OMPI project, but
 # OPAL currently doesn't protect for their lack of presence well.
 AC_CHECK_HEADERS(complex.h)
+AC_CHECK_TYPES(short float _Complex)
 AC_CHECK_TYPES(float _Complex)
 AC_CHECK_TYPES(double _Complex)
 AC_CHECK_TYPES(long double _Complex)
@@ -411,6 +435,9 @@ AC_CHECK_SIZEOF(short)
 AC_CHECK_SIZEOF(int)
 AC_CHECK_SIZEOF(long)
 AC_CHECK_SIZEOF(long long)
+if test "$ac_cv_type_short_float" = yes; then
+    AC_CHECK_SIZEOF(short float)
+fi
 AC_CHECK_SIZEOF(float)
 AC_CHECK_SIZEOF(double)
 AC_CHECK_SIZEOF(long double)
@@ -419,6 +446,9 @@ if test "$ac_cv_type___float128" = yes; then
 fi
 # We only need these types if we're building the OMPI project, but
 # OPAL currently doesn't protect for their lack of presence well.
+if test "$ac_cv_type_short_float__Complex" = yes; then
+    AC_CHECK_SIZEOF(short float _Complex)
+fi
 AC_CHECK_SIZEOF(float _Complex)
 AC_CHECK_SIZEOF(double _Complex)
 AC_CHECK_SIZEOF(long double _Complex)
@@ -461,6 +491,9 @@ OPAL_C_GET_ALIGNMENT(wchar_t, OPAL_ALIGNMENT_WCHAR)
 OPAL_C_GET_ALIGNMENT(int, OPAL_ALIGNMENT_INT)
 OPAL_C_GET_ALIGNMENT(long, OPAL_ALIGNMENT_LONG)
 OPAL_C_GET_ALIGNMENT(long long, OPAL_ALIGNMENT_LONG_LONG)
+if test "$ac_cv_type_short_float" = yes; then
+    OPAL_C_GET_ALIGNMENT(short float, OPAL_ALIGNMENT_SHORT_FLOAT)
+fi
 OPAL_C_GET_ALIGNMENT(float, OPAL_ALIGNMENT_FLOAT)
 OPAL_C_GET_ALIGNMENT(double, OPAL_ALIGNMENT_DOUBLE)
 OPAL_C_GET_ALIGNMENT(long double, OPAL_ALIGNMENT_LONG_DOUBLE)
@@ -471,13 +504,22 @@ fi
 
 # We only need these types if we're building the OMPI project, but
 # OPAL currently doesn't protect for their lack of presence well.
+if test "$ac_cv_type_short_float__Complex" = yes; then
+    OPAL_C_GET_ALIGNMENT(short float _Complex, OPAL_ALIGNMENT_SHORT_FLOAT_COMPLEX)
+fi
 OPAL_C_GET_ALIGNMENT(float _Complex, OPAL_ALIGNMENT_FLOAT_COMPLEX)
 OPAL_C_GET_ALIGNMENT(double _Complex, OPAL_ALIGNMENT_DOUBLE_COMPLEX)
 OPAL_C_GET_ALIGNMENT(long double _Complex, OPAL_ALIGNMENT_LONG_DOUBLE_COMPLEX)
 
 OPAL_C_GET_ALIGNMENT(void *, OPAL_ALIGNMENT_VOID_P)
 OPAL_C_GET_ALIGNMENT(size_t, OPAL_ALIGNMENT_SIZE_T)
 
+#
+# Check for an alternate type of C 'short float'
+#
+
+OPAL_CHECK_ALT_SHORT_FLOAT
+
 #
 # Check for other compiler characteristics
 #

ompi/datatype/ompi_datatype.h

@@ -9,6 +9,7 @@
  *                         reserved.
  * Copyright (c) 2015-2018 Research Organization for Information Science
  *                         and Technology (RIST). All rights reserved.
+ * Copyright (c) 2018      FUJITSU LIMITED.  All rights reserved.
  * $COPYRIGHT$
  *
  * Additional copyrights may follow
@@ -57,7 +58,7 @@ BEGIN_C_DECLS
 #define OMPI_DATATYPE_FLAG_DATA_FORTRAN  0xC000
 #define OMPI_DATATYPE_FLAG_DATA_LANGUAGE 0xC000
 
-#define OMPI_DATATYPE_MAX_PREDEFINED 47
+#define OMPI_DATATYPE_MAX_PREDEFINED 50
 
 #if OMPI_DATATYPE_MAX_PREDEFINED > OPAL_DATATYPE_MAX_SUPPORTED
 #error Need to increase the number of supported dataypes by OPAL (value OPAL_DATATYPE_MAX_SUPPORTED).