Implement 64-bit double functions.

gcc/
	PR target/92055
	* config.gcc (tm_defines) [target=avr]: Support --with-libf7,
	--with-double-comparison.
	* doc/install.texi: Document them.
	* config/avr/avr-c.c (avr_cpu_cpp_builtins)
	<WITH_LIBF7_LIBGCC, WITH_LIBF7_MATH, WITH_LIBF7_MATH_SYMBOLS>
	<WITH_DOUBLE_COMPARISON>: New built-in defines.
	* doc/invoke.texi (AVR Built-in Macros): Document them.
	* config/avr/avr-protos.h (avr_float_lib_compare_returns_bool): New.
	* config/avr/avr.c (avr_float_lib_compare_returns_bool): New function.
	* config/avr/avr.h (FLOAT_LIB_COMPARE_RETURNS_BOOL): New macro.
libgcc/
	PR target/92055
	* config.host (tmake_file) [target=avr]: Add t-libf7,
	t-libf7-math, t-libf7-math-symbols as specified by --with-libf7=.
	* config/avr/t-avrlibc: Don't copy libgcc.a if there are modules
	depending on sizeof (double) or sizeof (long double).
	* config/avr/libf7: New folder.
libgcc/config/avr/libf7/
	PR target/92055
	* t-libf7: New file.
	* t-libf7-math: New file.
	* t-libf7-math-symbols: New file.
	* libf7-common.mk: New file.
	* libf7-asm-object.mk: New file.
	* libf7-c-object.mk: New file.
	* asm-defs.h: New file.
	* libf7.h: New file.
	* libf7.c: New file.
	* libf7-asm.sx: New file.
	* libf7-array.def: New file.
	* libf7-const.def: New file.
	* libf7-constdef.h: New file.
	* f7renames.sh: New script.
	* f7wraps.sh: New script.
	* f7-renames.h: New generated file.
	* f7-wraps.h: New generated file.

From-SVN: r279994

1 files changed, 44 insertions, 4 deletions

diff --git a/gcc/config.gcc b/gcc/config.gcc
index c3d6464..6c957c4 100644
--- a/gcc/config.gcc
+++ b/gcc/config.gcc
@@ -1336,8 +1336,48 @@ avr-*-*)
 	    tm_file="${tm_file} ${cpu_type}/avrlibc.h"
 	    tm_defines="${tm_defines} WITH_AVRLIBC"
 	fi
+	# Work out avr_double_comparison which is 2 or 3 and is used in
+	# target hook FLOAT_LIB_COMPARE_RETURNS_BOOL to determine whether
+	# DFmode comparisons return 3-state or 2-state results.
+	case y${with_double_comparison} in
+	    y | ytristate)
+		avr_double_comparison=3
+		;;
+	    ybool | ylibf7)
+		avr_double_comparison=2
+		;;
+	    *)
+		echo "Error: --with-double-comparison= can only be used with: 'tristate', 'bool', 'libf7'" 1>&2
+		exit 1
+		;;
+	esac
+	case "y${with_libf7}" in
+	    yno)
+		# avr_double_comparison as set above.
+		;;
+	    ylibgcc)
+		avr_double_comparison=2
+		tm_defines="${tm_defines} WITH_LIBF7_LIBGCC"
+		;;
+	    y | yyes | ymath-symbols)
+		avr_double_comparison=2
+		tm_defines="${tm_defines} WITH_LIBF7_LIBGCC"
+		tm_defines="${tm_defines} WITH_LIBF7_MATH"
+		tm_defines="${tm_defines} WITH_LIBF7_MATH_SYMBOLS"
+		;;
+	    ymath)
+		avr_double_comparison=2
+		tm_defines="${tm_defines} WITH_LIBF7_LIBGCC"
+		tm_defines="${tm_defines} WITH_LIBF7_MATH"
+		;;
+	    *)
+		echo "Error: --with-libf7=${with_libf7} but can only be used with: 'libgcc', 'math', 'math-symbols', 'yes', 'no'" 1>&2
+		exit 1
+		;;
+	esac
+	tm_defines="${tm_defines} WITH_DOUBLE_COMPARISON=${avr_double_comparison}"
 	case y${with_double} in
-	    y | y32)
+	    y32)
 		avr_double=32
 		tm_defines="${tm_defines} HAVE_DOUBLE32"
 		;;
@@ -1352,7 +1392,7 @@ avr-*-*)
 		tm_defines="${tm_defines} HAVE_DOUBLE64"
 		tm_defines="${tm_defines} HAVE_DOUBLE_MULTILIB"
 		;;
-	    y32,64)
+	    y | y32,64)
 		avr_double=32
 		avr_double_multilib=1
 		tm_defines="${tm_defines} HAVE_DOUBLE32"
@@ -1365,7 +1405,7 @@ avr-*-*)
 		;;
 	esac
 	case y${with_long_double} in
-	    y | y32)
+	    y32)
 		avr_long_double=32
 		tm_defines="${tm_defines} HAVE_LONG_DOUBLE32"
 		;;
@@ -1373,7 +1413,7 @@ avr-*-*)
 		avr_long_double=64
 		tm_defines="${tm_defines} HAVE_LONG_DOUBLE64"
 		;;
-	    y64,32)
+	    y | y64,32)
 		avr_long_double=64
 		avr_long_double_multilib=1
 		tm_defines="${tm_defines} HAVE_LONG_DOUBLE32"