scan_string.py revision 6474:585faad1057f 
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42# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
43# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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45# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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53#
54# Authors: Gabe Black
55
56microcode = '''
57def macroop SCAS_M {
58    # Find the constant we need to either add or subtract from rdi
59    ruflag t0, 10
60    movi t2, t2, dsz, flags=(CEZF,), dataSize=asz
61    subi t3, t0, dsz, dataSize=asz
62    mov t2, t2, t3, flags=(nCEZF,), dataSize=asz
63
64    ld t1, es, [1, t0, rdi]
65    sub t0, rax, t1, flags=(OF, SF, ZF, AF, PF, CF)
66
67    add rdi, rdi, t2, dataSize=asz
68};
69
70#
71# Versions which have the rep prefix. These could benefit from some loop
72# unrolling.
73#
74
75def macroop SCAS_E_M {
76    and t0, rcx, rcx, flags=(EZF,), dataSize=asz
77    br label("end"), flags=(CEZF,)
78
79    # Find the constant we need to either add or subtract from rdi
80    ruflag t0, 10
81    movi t2, t2, dsz, flags=(CEZF,), dataSize=asz
82    subi t3, t0, dsz, dataSize=asz
83    mov t2, t2, t3, flags=(nCEZF,), dataSize=asz
84
85topOfLoop:
86    ld t1, es, [1, t0, rdi]
87    sub t0, rax, t1, flags=(OF, SF, ZF, AF, PF, CF)
88
89    subi rcx, rcx, 1, flags=(EZF,), dataSize=asz
90    add rdi, rdi, t2, dataSize=asz
91    br label("topOfLoop"), flags=(CSTRZnEZF,)
92end:
93    fault "NoFault"
94};
95
96def macroop SCAS_N_M {
97    and t0, rcx, rcx, flags=(EZF,), dataSize=asz
98    br label("end"), flags=(CEZF,)
99
100    # Find the constant we need to either add or subtract from rdi
101    ruflag t0, 10
102    movi t2, t2, dsz, flags=(CEZF,), dataSize=asz
103    subi t3, t0, dsz, dataSize=asz
104    mov t2, t2, t3, flags=(nCEZF,), dataSize=asz
105
106topOfLoop:
107    ld t1, es, [1, t0, rdi]
108    sub t0, rax, t1, flags=(OF, SF, ZF, AF, PF, CF)
109
110    subi rcx, rcx, 1, flags=(EZF,), dataSize=asz
111    add rdi, rdi, t2, dataSize=asz
112    br label("topOfLoop"), flags=(CSTRnZnEZF,)
113end:
114    fault "NoFault"
115};
116
117'''
118