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40
41 /*
42 // Contents:
43 // cpMontExp_WinSize()
44 //
45 */
46
47 #include "owndefs.h"
48 #include "owncp.h"
49 #include "pcpbn.h"
50 #include "pcpmontgomery.h"
51 #include "gsscramble.h"
52
53
54 #if !defined(_USE_WINDOW_EXP_)
cpMontExp_WinSize(int bitsize)55 cpSize cpMontExp_WinSize(int bitsize)
56 {
57 UNREFERENCED_PARAMETER(bitsize);
58 return 1;
59 }
60
61 #else
62 /*
63 // returns (optimal) window width
64 // Because of safety Window width depend on CACHE LINE size:
65 // P4,EM64T, ITP - 64 bytes
66 // XScale - 32 bytes
67 // Blend - no cache
68 */
69 #if !((_IPP==_IPP_W7) || (_IPP==_IPP_T7) || \
70 (_IPP==_IPP_V8) || (_IPP==_IPP_P8) || \
71 (_IPP==_IPP_S8) || (_IPP>=_IPP_G9) || \
72 (_IPP32E==_IPP32E_M7) || \
73 (_IPP32E==_IPP32E_U8) || (_IPP32E==_IPP32E_Y8) || \
74 (_IPP32E==_IPP32E_N8) || (_IPP32E>=_IPP32E_E9))
cpMontExp_WinSize(int bitsize)75 cpSize cpMontExp_WinSize(int bitsize)
76 {
77 UNREFERENCED_PARAMETER(bitsize);
78 return 1;
79 }
80 #endif
81
82 #if ((_IPP==_IPP_W7) || (_IPP==_IPP_T7) || \
83 (_IPP==_IPP_V8) || (_IPP==_IPP_P8) || \
84 (_IPP==_IPP_S8) || (_IPP>=_IPP_G9) || \
85 (_IPP32E==_IPP32E_M7) || \
86 (_IPP32E==_IPP32E_U8) || (_IPP32E==_IPP32E_Y8) || \
87 (_IPP32E==_IPP32E_N8) || (_IPP32E>=_IPP32E_E9))
cpMontExp_WinSize(int bitsize)88 cpSize cpMontExp_WinSize(int bitsize)
89 {
90 return
91 //bitsize>3715? 8 : /*limited by 6 or 4 (LOG_CACHE_LINE_SIZE); we use it for windowing-exp imtigation */
92 //bitsize>1434? 7 :
93 #if (_IPP !=_IPP_M5)
94 bitsize> 539? 6 :
95 bitsize> 197? 5 :
96 #endif
97 bitsize> 70? 4 :
98 bitsize> 25? 3 :
99 bitsize> 9? 2 : 1;
100 }
101 #endif
102
103 #endif /* _USE_WINDOW_EXP_ */
104