[linux-2.6-block.git] / arch / metag / lib / ashrdi3.S

! SPDX-License-Identifier: GPL-2.0
! Copyright (C) 2012 by Imagination Technologies Ltd.
!
! 64-bit arithmetic shift right routine.
!

	.text
	.global ___ashrdi3
	.type   ___ashrdi3,function

___ashrdi3:
	MOV     D0Re0,D0Ar2
	MOV     D1Re0,D1Ar1
	CMP     D1Ar3,#0                ! COUNT == 0
	MOVEQ   PC,D1RtP                ! Yes, return

	MOV     D0Ar4,D1Ar3
	SUBS    D1Ar3,D1Ar3,#32         ! N = COUNT - 32
	BGE     $L20

!! Shift < 32
	NEG     D1Ar3,D1Ar3             ! N = - N
	LSR     D0Re0,D0Re0,D0Ar4       ! LO = LO >> COUNT
	LSL     D0Ar6,D1Re0,D1Ar3       ! TMP= HI << -(COUNT - 32)
	OR      D0Re0,D0Re0,D0Ar6       ! LO = LO | TMP
	SWAP    D1Ar3,D0Ar4
	ASR     D1Re0,D1Re0,D1Ar3       ! HI = HI >> COUNT
	MOV     PC,D1RtP
$L20:
!! Shift >= 32
	ASR     D0Re0,D1Re0,D1Ar3       ! LO = HI >> N
	ASR     D1Re0,D1Re0,#31         ! HI = HI >> 31
	MOV     PC,D1RtP
	.size ___ashrdi3,.-___ashrdi3
Commit	Line	Data
b2441318	1	! SPDX-License-Identifier: GPL-2.0
086e9dc0 JH	2	! Copyright (C) 2012 by Imagination Technologies Ltd.
	3	!
	4	! 64-bit arithmetic shift right routine.
	5	!
	6
	7	.text
	8	.global ___ashrdi3
	9	.type ___ashrdi3,function
	10
	11	___ashrdi3:
	12	MOV D0Re0,D0Ar2
	13	MOV D1Re0,D1Ar1
	14	CMP D1Ar3,#0 ! COUNT == 0
	15	MOVEQ PC,D1RtP ! Yes, return
	16
	17	MOV D0Ar4,D1Ar3
	18	SUBS D1Ar3,D1Ar3,#32 ! N = COUNT - 32
	19	BGE $L20
	20
	21	!! Shift < 32
	22	NEG D1Ar3,D1Ar3 ! N = - N
	23	LSR D0Re0,D0Re0,D0Ar4 ! LO = LO >> COUNT
	24	LSL D0Ar6,D1Re0,D1Ar3 ! TMP= HI << -(COUNT - 32)
	25	OR D0Re0,D0Re0,D0Ar6 ! LO = LO \| TMP
	26	SWAP D1Ar3,D0Ar4
	27	ASR D1Re0,D1Re0,D1Ar3 ! HI = HI >> COUNT
	28	MOV PC,D1RtP
	29	$L20:
	30	!! Shift >= 32
	31	ASR D0Re0,D1Re0,D1Ar3 ! LO = HI >> N
	32	ASR D1Re0,D1Re0,#31 ! HI = HI >> 31
	33	MOV PC,D1RtP
	34	.size ___ashrdi3,.-___ashrdi3