[PATCH, libgcc]: Put soft-FP exception handler out-of-line for x86

[Uros Bizjak <ubizjak at gmail dot com>]

Hello!

Attached patch rewrites x86 soft-FP as an out-of-line function that
gets conditionally called when exception occurs. This rewrite removes
17 instances of the same code from libgcc. In addition, the patch
unifies a lot of code between 32bit and 64bit x86 target, and also
introduces SSE instructions for 32bit targets. There is no other
functional changes, although the change to real SSE FP ops is
tempting. ;)

2012-06-07  Uros Bizjak  <ubizjak@gmail.com>

	* config/i386/32/sfp-machine.h (__gcc_CMPtype, CMPtype,
	_FP_KEEPNANFRACP, _FP_CHOOSENAN, FP_EX_INVALID, FP_EX_DENORM,
	FP_EX_DIVZERO, FP_EX_OVERFLOW, FP_EX_UNDERFLOW, FP_EX_INEXACT,
	FP_HANDLE_EXCEPTIONS, FP_RND_NEAREST, FP_RND_ZERO, FP_RND_PINF,
	FP_RND_MINF, _FP_DEXL_EX, FP_INIT_ROUNDMODE, FP_ROUNDMODE,
	__LITTLE_ENDIAN, __BIG_ENDIAN, strong_alias): Move ...
	* config/i386/64/sfp-machine: ... (delete here) ...
	* config/i386/sfp-machine.h: ... to here.
	(FP_EX_MASK): New.
	(__sfp_handle_exceptions): New function declaration.
	(FP_HANDLE_EXCEPTIONS): Use __sfp_handle_exceptions.
	* config/i386/sfp-exceptions.c: New.
	* config/i386/t-softfp: New.
	* config.host (i[34567]86-*-* and x86_64-*-* soft-fp targets): Add
	i386/t-softfp to tmake_file.

Patch was tested on x86_64-pc-linux-gnu {,-m32}.

The patch needs approval from libgcc maintainer.

OK for mainline?

Uros.

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