tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1! Copyright (C) 2012 by Imagination Technologies Ltd.
2!
3! 64-bit arithmetic shift right routine.
4!
5
6 .text
7 .global ___ashrdi3
8 .type ___ashrdi3,function
9
10___ashrdi3:
11 MOV D0Re0,D0Ar2
12 MOV D1Re0,D1Ar1
13 CMP D1Ar3,#0 ! COUNT == 0
14 MOVEQ PC,D1RtP ! Yes, return
15
16 MOV D0Ar4,D1Ar3
17 SUBS D1Ar3,D1Ar3,#32 ! N = COUNT - 32
18 BGE $L20
19
20!! Shift < 32
21 NEG D1Ar3,D1Ar3 ! N = - N
22 LSR D0Re0,D0Re0,D0Ar4 ! LO = LO >> COUNT
23 LSL D0Ar6,D1Re0,D1Ar3 ! TMP= HI << -(COUNT - 32)
24 OR D0Re0,D0Re0,D0Ar6 ! LO = LO | TMP
25 SWAP D1Ar3,D0Ar4
26 ASR D1Re0,D1Re0,D1Ar3 ! HI = HI >> COUNT
27 MOV PC,D1RtP
28$L20:
29!! Shift >= 32
30 ASR D0Re0,D1Re0,D1Ar3 ! LO = HI >> N
31 ASR D1Re0,D1Re0,#31 ! HI = HI >> 31
32 MOV PC,D1RtP
33 .size ___ashrdi3,.-___ashrdi3