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Re: [patch i386]: Add for win32 targets pre-prologue profiling feature


Hello,

I found one missing nit for cygwin/mingw, which is corrected by this
patch. For win32 target an initial call to _monstartup has to be done
in main before mcount get called. For this I added to cygming.h the
new macro PROFILE_HOOK_BEFORE_PROFILE to handle it.

So new patch with updated ChangeLog

	* config/i386/cygming.h (MCOUNT_NAME): New.
	(MCOUNT_NAME_BEFORE_PROLOGUE): New.
	(PROFILE_HOOK_BEFORE_PROFILE): New.
	(PROFILE_HOOK): Check if not fentry is active.
	* config/i386/i386.c (ix86_profile_before_prologue): New.
	(override_options): Add special handling for -mfentry.
	(ix86_function_regparm): Likewise.
	(ix86_function_sseregparm): Likewise.
	(ix86_frame_pointer_required): Likewise.
	(ix86_expand_prologue): Check for ms_hook_prologue.
	(x86_function_profiler): Adjust mcount output and
	call PROFILE_HOOK_BEFORE_PROFILE.
	(TARGET_PROFILE_BEFORE_PROLOGUE): Define hook.
	* config/i386/i386.opt (mfentry): New.
	* doc/invoke.texi (mfentry): Add documentation.
	* doc/tm.texi: Regenerated..
	* doc/tm.texi.in (TARGET_PROFILE_BEFORE_PROLOGUE): New.
	* final.c (final_start_function): Replace macro
	PROFILE_BEFORE_PROLOGUE by target hook.
	* function.c (thread_prologue_and_epilogue_insns): Likewise.
	* target.def (profile_before_prologue): New hook.
	* targhooks.c (default_profile_before_prologue): New.
	* targhooks.h (default_profile_before_prologue): New.


Tested for i686-pc-mingw32, i686-pc-cygwin, and x86_64-pc-mingw32. Ok for apply?

Regards,
Kai

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