[PATCH 3/5] x86: Add -mindirect-branch-register

[Jan Hubicka]

> Add -mindirect-branch-register to force indirect branch via register.
> This is implemented by disabling patterns of indirect branch via memory,
> similar to TARGET_X32.
> 
> -mindirect-branch= and -mfunction-return= tests are updated with
> -mno-indirect-branch-register to avoid false test failures when
> -mindirect-branch-register is added to RUNTESTFLAGS for "make check".
> 
> gcc/
> 
> 	* config/i386/constraints.md (Bs): Disallow memory operand for
> 	-mindirect-branch-register.
> 	(Bw): Likewise.
> 	* config/i386/predicates.md (indirect_branch_operand): Likewise.
> 	(GOT_memory_operand): Likewise.
> 	(call_insn_operand): Likewise.
> 	(sibcall_insn_operand): Likewise.
> 	(GOT32_symbol_operand): Likewise.
> 	* config/i386/i386.md (indirect_jump): Call convert_memory_address
> 	for -mindirect-branch-register.
> 	(tablejump): Likewise.
> 	(*sibcall_memory): Likewise.
> 	(*sibcall_value_memory): Likewise.
> 	Disallow peepholes of indirect call and jump via memory for
> 	-mindirect-branch-register.
> 	(*call_pop): Replace m with Bw.
> 	(*call_value_pop): Likewise.
> 	(*sibcall_pop_memory): Replace m with Bs.
> 	* config/i386/i386.opt (mindirect-branch-register): New option.
> 	* doc/invoke.texi: Document -mindirect-branch-register option.

OK.
Honza