extend.texi (Half-Precision): New section.

2009-06-18  Sandra Loosemore  <sandra@codesourcery.com>

	gcc/
	* doc/extend.texi (Half-Precision): New section.
	* doc/invoke.texi (Option Summary): List -mfp16-format.
	(ARM Options): List neon-fp16 as -mfpu value.  Document -mfp16-format.
	* config/arm/arm.opt (mfp16-format=): New.
	* config/arm/arm.c: Include intl.h.
	(TARGET_INVALID_PARAMETER_TYPE): Redefine.
	(TARGET_INVALID_RETURN_TYPE): Redefine.
	(TARGET_PROMOTED_TYPE): Redefine.
	(TARGET_CONVERT_TO_TYPE): Redefine.
	(arm_fp16_format): Define.
	(all_fpus): Add entry for neon-fp16.
	(fp_model_for_fpu): Likewise.
	(struct fp16_format): Declare.
	(all_fp16_formats): Define.
	(arm_init_libfuncs): Add entries for HFmode conversions and arithmetic
	functions.
	(arm_override_options): Set arm_fp16_format. Call sorry for fp16
	and no ldrh.
	(arm_legitimate_index_p): Treat HFmode like HImode.
	(thumb1_legitimate_address_p): Make it recognize HFmode constants.
	(coproc_secondary_reload_class): Special-case HFmode.
	(arm_print_operand): Add 'z' specifier for vld1.16/vst1.16.
	(arm_hard_regno_mode_ok): Allow HFmode values in VFP registers.
	(arm_init_fp16_builtins): New.
	(arm_init_builtins): Call it.
	(arm_invalid_parameter_type): New.
	(arm_invalid_return_type): New.
	(arm_promoted_type): New.
	(arm_convert_to_type).
	(arm_file_start): Deal with neon-fp16 as fpu_name.  Emit tag for fp16
	format.
	(arm_emit_fp16_const): New function.
	(arm_mangle_type): Mangle __fp16 as "Dh".
	* config/arm/arm.h (TARGET_VFPD32): Make it know about
	FPUTYPE_NEON_FP16.
	(TARGET_NEON_FP16): New.
	(TARGET_NEON): Make it know about FPUTYPE_NEON_FP16.
	(enum fputype): Add FPUTYPE_NEON_FP16.
	(enum arm_fp16_format_type): Declare.
	(arm_fp16_format): Declare.
	(LARGEST_EXPONENT_IS_NORMAL): Define.
	* config/arm/arm-protos.h (arm_emit_fp16_const): Declare.
	* config/arm/arm-modes.def (HFmode): Define.
	* config/arm/vfp.md: (*movhf_vfp): New.
	(extendhfsf2): New.
	(truncsfhf2): New.
	* config/arm/arm.md: (fpu): Add neon_fp16.
	(floatsihf2, floatdihf2): New.
	(fix_trunchfsi2, fix_trunchfdi2): New.
	(truncdfhf2): New.
	(extendhfdf2): New.
	(movhf): New.
	(*arm32_movhf): New.
	(*thumb1_movhf): New.
	(consttable_2): Add check for HFmode constants.
	(consttable_4): Handle HFmode constants.

From-SVN: r148654

1 files changed, 10 insertions, 2 deletions

diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index 4d28e9d..2324960 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -443,6 +443,7 @@ Objective-C and Objective-C++ Dialects}.
 -msched-prolog  -mno-sched-prolog @gol
 -mlittle-endian  -mbig-endian  -mwords-little-endian @gol
 -mfloat-abi=@var{name}  -msoft-float  -mhard-float  -mfpe @gol
+-mfp16-format=@var{name}
 -mthumb-interwork  -mno-thumb-interwork @gol
 -mcpu=@var{name}  -march=@var{name}  -mfpu=@var{name}  @gol
 -mstructure-size-boundary=@var{n} @gol
@@ -9301,14 +9302,21 @@ of the @option{-mcpu=} option.  Permissible names are: @samp{armv2},
 @opindex mfp
 This specifies what floating point hardware (or hardware emulation) is
 available on the target.  Permissible names are: @samp{fpa}, @samp{fpe2},
-@samp{fpe3}, @samp{maverick}, @samp{vfp}, @samp{vfpv3}, @samp{vfpv3-d16} and
-@samp{neon}.  @option{-mfp} and @option{-mfpe}
+@samp{fpe3}, @samp{maverick}, @samp{vfp}, @samp{vfpv3}, @samp{vfpv3-d16},
+@samp{neon}, and @samp{neon-fp16}.  @option{-mfp} and @option{-mfpe}
 are synonyms for @option{-mfpu}=@samp{fpe}@var{number}, for compatibility
 with older versions of GCC@.
 
 If @option{-msoft-float} is specified this specifies the format of
 floating point values.
 
+@item -mfp16-format=@var{name}
+@opindex mfp16-format
+Specify the format of the @code{__fp16} half-precision floating-point type.
+Permissible names are @samp{none}, @samp{ieee}, and @samp{alternative}; 
+the default is @samp{none}, in which case the @code{__fp16} type is not 
+defined.  @xref{Half-Precision}, for more information.
+
 @item -mstructure-size-boundary=@var{n}
 @opindex mstructure-size-boundary
 The size of all structures and unions will be rounded up to a multiple