gcc/libgcc/config/msp430/srai.S

;   Copyright (C) 2012-2022 Free Software Foundation, Inc.
;   Contributed by Red Hat.
; 
; This file is free software; you can redistribute it and/or modify it
; under the terms of the GNU General Public License as published by the
; Free Software Foundation; either version 3, or (at your option) any
; later version.
; 
; This file is distributed in the hope that it will be useful, but
; WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
; General Public License for more details.
; 
; Under Section 7 of GPL version 3, you are granted additional
; permissions described in the GCC Runtime Library Exception, version
; 3.1, as published by the Free Software Foundation.
;
; You should have received a copy of the GNU General Public License and
; a copy of the GCC Runtime Library Exception along with this program;
; see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
; <http://www.gnu.org/licenses/>.
	
	.text

	.section	.text.__mspabi_srai_n
	.macro	_srai n
	.global __mspabi_srai_\n
__mspabi_srai_\n:
	RRA.W	R12
	.endm

/* Arithmetic Right Shift - R12 -> R12.  */
	_srai	15
	_srai	14
	_srai	13
	_srai	12
	_srai	11
	_srai	10
	_srai	9
	_srai	8
	_srai	7
	_srai	6
	_srai	5
	_srai	4
	_srai	3
	_srai	2
	_srai	1
#ifdef __MSP430X_LARGE__
	RETA
#else
	RET
#endif

	.section	.text.__mspabi_srai
1:	ADD.W	#-1,R13
	RRA.W	R12,R12
	.global	__mspabi_srai
__mspabi_srai:
	CMP	#0,R13
	JNZ	1b
#ifdef __MSP430X_LARGE__
	RETA
#else
	RET
#endif

#ifdef __MSP430X__
	.section	.text.__gnu_mspabi_srap
1:	ADDA	#-1,R13
	RRAX.A	R12,R12
	.global	__gnu_mspabi_srap
__gnu_mspabi_srap:
	CMP	#0,R13
	JNZ	1b
#ifdef __MSP430X_LARGE__
	RETA
#else
	RET
#endif /* __MSP430X_LARGE__ */
#endif /* __MSP430X__ */

/* Arithmetic Right Shift - R12:R13 -> R12:R13.  */

	.section	.text.__mspabi_sral_n
	.macro	_sral	n
	.global	__mspabi_sral_\n
__mspabi_sral_\n:
	RRA.W	R13
	RRC.W	R12
	.endm

	_sral	15
	_sral	14
	_sral	13
	_sral	12
	_sral	11
	_sral	10
	_sral	9
	_sral	8
	_sral	7
	_sral	6
	_sral	5
	_sral	4
	_sral	3
	_sral	2
	_sral	1
#ifdef __MSP430X_LARGE__
	RETA
#else
	RET
#endif

	.section	.text.__mspabi_sral
1:	ADD.W	#-1,R14
	RRA.W	R13
	RRC.W	R12
	.global	__mspabi_sral
__mspabi_sral:
	CMP	#0,R14
	JNZ	1b
#ifdef __MSP430X_LARGE__
	RETA
#else
	RET
#endif

/* Arithmetic Right Shift - R8:R11 -> R12:R15
   A 64-bit argument would normally be passed in R12:R15, but __mspabi_srall has
   special conventions, so the 64-bit value to shift is passed in R8:R11.
   According to the MSPABI, the shift amount is a 64-bit value in R12:R15, but
   we only use the low word in R12.  */

	.section	.text.__mspabi_srall
	.global __mspabi_srall
__mspabi_srall:
	MOV R11, R15 ; Free up R11 first
	MOV R12, R11 ; Save the shift amount in R11
	MOV R10, R14
	MOV R9, R13
	MOV R8, R12
	CMP #0, R11
	JNZ 1f
#ifdef __MSP430X_LARGE__
	RETA
#else
	RET
#endif
1:
	RRA R15
	RRC R14
	RRC R13
	RRC R12
	ADD #-1,R11
	JNZ 1b
#ifdef __MSP430X_LARGE__
	RETA
#else
	RET
#endif