rs6000-cpus.def (OTHER_VSX_VECTOR_MASKS): Delete OPTION_MASK_FLOAT128_KEYWORD.

[gcc]
2017-09-07  Michael Meissner  <meissner@linux.vnet.ibm.com>

	* config/rs6000/rs6000-cpus.def (OTHER_VSX_VECTOR_MASKS): Delete
	OPTION_MASK_FLOAT128_KEYWORD.
	(POWERPC_MASKS): Likewise.
	* config/rs6000/rs6000-c.c (rs6000_target_modify_macros): Delete
	support for the -mfloat128-type option, and make -mfloat128
	default on PowerPC Linux systems.  Define or undefine
	__FLOAT128__ and  __FLOAT128_HARDWARE__ for the current options.
	Define __float128 to be __ieee128 if IEEE 128-bit support is
	enabled, or undefine it.
	(rs6000_cpu_cpp_builtins): Delete defining __FLOAT128__ here.
	Delete defining __FLOAT128_TYPE__.
	* config/rs6000/rs6000.opt (x_TARGET_FLOAT128_TYPE): Delete the
	-mfloat128-type option and make -mfloat128 default on PowerPC
	Linux systems.
	(TARGET_FLOAT128_TYPE): Likewise.
	(-mfloat128-type): Likewise.
	* config/rs6000/rs6000.c (rs6000_option_override_internal):
	Delete the -mfloat128-type option and make -mfloat128 default on
	PowerPC Linux systems.  Always use __ieee128 to be the keyword for
	the IEEE 128-bit type, and map __float128 to __ieee128 if IEEE
	128-bit floating point is enabled.  Change tests from using
	-mfloat128-type to -mfloat128.
	(rs6000_mangle_type): Use the correct mangling for the __float128
	type even if normal long double is restricted to 64-bits.
	(floatn_mode): Enable the _Float128 type by default on VSX Linux
	systems.
	* config/rs6000/rs6000.h (MASK_FLOAT128_TYPE): Delete.
	(MASK_FLOAT128_KEYWORD): Define new shortcut macro.
	(RS6000BTM_FLOAT128): Define in terms of -mfloat128, not
	-mfloat128-type.
	* doc/invoke.texi (RS/6000 and PowerPC Options): Update
	documentation for -mfloat128.

[gcc/testsuite]
2017-09-07  Michael Meissner  <meissner@linux.vnet.ibm.com>

	* gcc.target/powerpc/float128-1.c: Update options to know that
	-mfloat128 is now on by default on PowerPC VSX systems.  Remove
	-static-libgcc option which is no longer needed.  Use -mvsx or
	-mpower9-vector to enable VSX or hardware IEEE support, rather
	than specifying a particular CPU.
	* gcc.target/powerpc/float128-2.c: Likewise.
	* gcc.target/powerpc/float128-cmp.c: Likewise.
	* gcc.target/powerpc/float128-complex-1.c: Likewise.
	* gcc.target/powerpc/float128-complex-2.c: Likewise.
	* gcc.target/powerpc/float128-hw.c: Likewise.
	* gcc.target/powerpc/float128-mix.c: Likewise.
	* gcc.target/powerpc/float128-type-1.c: Likewise.
	* gcc.target/powerpc/float128-type-2.c: Likewise.
	* gcc.target/powerpc/float128-3.c: New test.
	* gcc.target/powerpc/float128-4.c: Likewise.
	* gcc.target/powerpc/float128-5.c: Likewise.

From-SVN: r251814

1 files changed, 18 insertions, 15 deletions

diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index 88edc93..6c844c6 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -22014,15 +22014,21 @@ Enable/disable the @var{__float128} keyword for IEEE 128-bit floating point
 and use either software emulation for IEEE 128-bit floating point or
 hardware instructions.
 
-The VSX instruction set (@option{-mvsx}, @option{-mcpu=power7}, or
-@option{-mcpu=power8}) must be enabled to use the @option{-mfloat128}
-option.  The @option{-mfloat128} option only works on PowerPC 64-bit
-Linux systems.
-
-If you use the ISA 3.0 instruction set (@option{-mcpu=power9}), the
-@option{-mfloat128} option will also enable the generation of ISA 3.0
-IEEE 128-bit floating point instructions.  Otherwise, IEEE 128-bit
-floating point will be done with software emulation.
+The VSX instruction set (@option{-mvsx}, @option{-mcpu=power7},
+@option{-mcpu=power8}), or @option{-mcpu=power9} must be enabled to
+use the IEEE 128-bit floating point support.  The IEEE 128-bit
+floating point support only works on PowerPC Linux systems.
+
+The default for @option{-mfloat128} is enabled on PowerPC Linux
+systems using the VSX instruction set, and disabled on other systems.
+
+If you use the ISA 3.0 instruction set (@option{-mpower9-vector} or
+@option{-mcpu=power9}) on a 64-bit system, the IEEE 128-bit floating
+point support will also enable the generation of ISA 3.0 IEEE 128-bit
+floating point instructions.  Otherwise, if you do not specify to
+generate ISA 3.0 instructions or you are targeting a 32-bit big endian
+system, IEEE 128-bit floating point will be done with software
+emulation.
 
 @item -mfloat128-hardware
 @itemx -mno-float128-hardware
@@ -22031,12 +22037,9 @@ floating point will be done with software emulation.
 Enable/disable using ISA 3.0 hardware instructions to support the
 @var{__float128} data type.
 
-If you use @option{-mfloat128-hardware}, it will enable the option
-@option{-mfloat128} as well.
-
-If you select ISA 3.0 instructions with @option{-mcpu=power9}, but do
-not use either @option{-mfloat128} or @option{-mfloat128-hardware},
-the IEEE 128-bit floating point support will not be enabled.
+The default for @option{-mfloat128-hardware} is enabled on PowerPC
+Linux systems using the ISA 3.0 instruction set, and disabled on other
+systems.
 
 @item -mfloat-gprs=@var{yes/single/double/no}
 @itemx -mfloat-gprs