scan_string.py revision 5081 
1# Copyright (c) 2007 The Hewlett-Packard Development Company
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39# notice to acknowledge the contribution from this software where
40# applicable, this list of conditions and the disclaimer below.
41#
42# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
43# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
44# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
45# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
46# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
47# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
48# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
49# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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52# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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, t1, rax, 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    # Find the constant we need to either add or subtract from rdi
77    ruflag t0, 10
78    movi t2, t2, dsz, flags=(CEZF,), dataSize=asz
79    subi t3, t0, dsz, dataSize=asz
80    mov t2, t2, t3, flags=(nCEZF,), dataSize=asz
81
82    ld t1, es, [1, t0, rdi]
83    sub t0, t1, rax, flags=(OF, SF, ZF, AF, PF, CF)
84
85    subi rcx, rcx, 1, flags=(EZF,), dataSize=asz
86    add rdi, rdi, t2, dataSize=asz
87    bri t0, 4, flags=(CSTRZnEZF,)
88    fault "NoFault"
89};
90
91def macroop SCAS_N_M {
92    # Find the constant we need to either add or subtract from rdi
93    ruflag t0, 10
94    movi t2, t2, dsz, flags=(CEZF,), dataSize=asz
95    subi t3, t0, dsz, dataSize=asz
96    mov t2, t2, t3, flags=(nCEZF,), dataSize=asz
97
98    ld t1, es, [1, t0, rdi]
99    sub t0, t1, rax, flags=(OF, SF, ZF, AF, PF, CF)
100
101    subi rcx, rcx, 1, flags=(EZF,), dataSize=asz
102    add rdi, rdi, t2, dataSize=asz
103    bri t0, 4, flags=(CSTRnZnEZF,)
104    fault "NoFault"
105};
106
107'''
108