This started as a simple fix for a small issue (passing floating-point vectors 
to variadic functions in 64-bit mode) and then evolved into a small cleanup of 
the code implementing the calling conventions of the 2 SPARC ABIs.

Tested and compat-regtested on SPARC/Solaris 11, applied on the mainline.


2018-11-29  Eric Botcazou  <ebotcazou@adacore.com>

	PR target/87807
	* config/sparc/sparc-modes.def: Minor tweak.
	* config/sparc/sparc.c: Minor reordering.
	(sparc_pass_by_reference): Move around.
	(traverse_record_type): Change offset from HOST_WIDE_INT to int.
	(classify_registers): Likewise for bitpos.
	(function_arg_slotno): Remove dead test and tweak comments.
	<MODE_RANDOM>: Remove useless assertion and test whether the
	parameter is named in order to pass it in FP registers.  Return
	the regno for floating-point vector types.
	(compute_int_layout): Change bitpos from HOST_WIDE_INT to int.
	(compute_fp_layout): Likewise.
	(count_registers): Likewise.
	(assign_int_registers): Likewise.
	(assign_fp_registers): Likewise.
	(assign_registers): Likewise.
	(function_arg_record_value): Change size from HOST_WIDE_INT to int
	and use CEIL_NWORDS to compute the number of registers.
	(function_arg_union_value): Minor tweaks.
	(function_arg_vector_value): Add slotno and named parameters, use
	CEIL_NWORDS to compute the number of registers.
	(sparc_function_arg_1): Rework handling of vector types.  Change
	size from HOST_WIDE_INT to int.
	(sparc_arg_partial_bytes): Rework handling of 32-bit ABI and deal
	with vector types for the 64-bt ABI.
	(sparc_function_arg_advance): Likewise.
	(sparc_return_in_memory): Add reference to -fpcc-struct-return.
	(sparc_struct_value_rtx): Return NULL_RTX instead of 0.
	(sparc_function_value_1): Rework handling of vector types.  Change
	size from HOST_WIDE_INT to int.


2018-11-29  Eric Botcazou  <ebotcazou@adacore.com>

	* gcc.target/sparc/20181129-1.c: New test.
	* gcc.target/sparc/20181129-2.c: Likewise.

-- 
Eric Botcazou