[Patch ARM] PR target/19599 Enable sibcalls through function pointers.

[Ramana Radhakrishnan]

Hi,

This patch allows sibling calls through function pointers on the ARM
port. Testing currently on a qemu cross to cortex-a8 on arm-none-eabi
cross.

The one case (as Richard pointed out this morning ) not considered
with this patch is that it doesn't consider the corner case of users
trying to use -fcaller-save and -fcallee-save from the command line
but the caller-save callee-save bits of the ABI for this are quite
hard-coded in the ARM backend that one will have to rewrite quite a
few bits in the backend to get those options supported properly.

Ok to commit if no regressions ?


cheers
Ramana



2009-06-02  Ramana Radhakrishnan  <ramana.radhakrishnan@arm.com>
	
        PR target/19599	
	* config/arm/predicates.md (call_insn_operand): New predicate.
	* config/arm/constraints.md ("Cs"): New register constraint.
	("Ss"): New constraint for symbol references.
	* config/arm/arm.md (sibcall): Allow only memory indirects through
	symbol refs or register operands for operands[0].
	(sibcall_value): Likewise for operands[1].
	(*sibcall_insn): Allow register indirect sibcalls.
	(*sibcall_value): Allow register indirect sibcalls.
	* config/arm/arm.h (enum reg_class): New reg class ARM_CALLER_SAVE_REGS.
	(REG_CLASS_NAMES): Likewise.
	(REG_CLASS_CONTENTS): Likewise.
	* config/arm/arm.c (arm_function_ok_for_sibcall): Remove check for
	functions without decls. Handle fallout of NULL decls.
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