xchg.py revision 7501:a75564db03c3 
1# Copyright (c) 2007 The Hewlett-Packard Development Company
2# All rights reserved.
3#
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8# licensed hereunder.  You may use the software subject to the license
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24# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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35#
36# Authors: Gabe Black
37
38microcode = '''
39
40# All the memory versions need to use LOCK, regardless of if it was set
41
42def macroop XCHG_R_R
43{
44    # Use the xor trick instead of moves to reduce register pressure.
45    # This probably doesn't make much of a difference, but it's easy.
46    xor reg, reg, regm
47    xor regm, regm, reg
48    xor reg, reg, regm
49};
50
51def macroop XCHG_R_M
52{
53    ldstl t1, seg, sib, disp
54    stul reg, seg, sib, disp
55    mov reg, reg, t1
56};
57
58def macroop XCHG_R_P
59{
60    rdip t7
61    ldstl t1, seg, riprel, disp
62    stul reg, seg, riprel, disp
63    mov reg, reg, t1
64};
65
66def macroop XCHG_M_R
67{
68    ldstl t1, seg, sib, disp
69    stul reg, seg, sib, disp
70    mov reg, reg, t1
71};
72
73def macroop XCHG_P_R
74{
75    rdip t7
76    ldstl t1, seg, riprel, disp
77    stul reg, seg, riprel, disp
78    mov reg, reg, t1
79};
80
81def macroop XCHG_LOCKED_M_R
82{
83    ldstl t1, seg, sib, disp
84    stul reg, seg, sib, disp
85    mov reg, reg, t1
86};
87
88def macroop XCHG_LOCKED_P_R
89{
90    rdip t7
91    ldstl t1, seg, riprel, disp
92    stul reg, seg, riprel, disp
93    mov reg, reg, t1
94};
95'''
96