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C166 Version 5 Operation Timings
XC16x Devices — Small Model

The following benchmarks provide a baseline for the execution speed of code generated by the Keil C166 Compiler. Automated test scripts were used to calculate the minimum, average, and maximum time required for each operation.

Each benchmark lists the number of states and the number of seconds required to perform the operation. The state time represents the actual number of instruction cycles. You may specify the oscillator frequency and the clock divisor (for the instruction clock) to obtain execution times in seconds.

Enter MCU Speed Details
(Default XTAL Frequency: 20MHz)
 
XTAL Frequency: MHz
Instruction Clock Divisor:
 

Unsigned Character Operations

OperationMinAvgMax
unsigned char +4
.20 µSecs		4
.20 µSecs		4
.20 µSecs
unsigned char -4
.20 µSecs		4
.20 µSecs		4
.20 µSecs
unsigned char *7
.35 µSecs		7
.35 µSecs		7
.35 µSecs
unsigned char /8
.40 µSecs		8
.40 µSecs		8
.40 µSecs
unsigned char %9
.45 µSecs		9
.45 µSecs		9
.45 µSecs
unsigned char >>6
.30 µSecs		6
.30 µSecs		6
.30 µSecs
unsigned char <<5
.25 µSecs		5
.25 µSecs		5
.25 µSecs

Signed Character Operations

OperationMinAvgMax
signed char +4
.20 µSecs		4
.20 µSecs		4
.20 µSecs
signed char -4
.20 µSecs		4
.20 µSecs		4
.20 µSecs
signed char *7
.35 µSecs		7
.35 µSecs		7
.35 µSecs
signed char /8
.40 µSecs		8
.40 µSecs		8
.40 µSecs
signed char %9
.45 µSecs		9
.45 µSecs		9
.45 µSecs
signed char >>6
.30 µSecs		6
.30 µSecs		6
.30 µSecs
signed char <<5
.25 µSecs		5
.25 µSecs		5
.25 µSecs

Unsigned Integer Operations

OperationMinAvgMax
unsigned int +4
.20 µSecs		4
.20 µSecs		4
.20 µSecs
unsigned int -4
.20 µSecs		4
.20 µSecs		4
.20 µSecs
unsigned int *5
.25 µSecs		5
.25 µSecs		5
.25 µSecs
unsigned int /6
.30 µSecs		6
.30 µSecs		6
.30 µSecs
unsigned int %7
.35 µSecs		7
.35 µSecs		7
.35 µSecs
unsigned int >>4
.20 µSecs		4
.20 µSecs		4
.20 µSecs
unsigned int <<4
.20 µSecs		4
.20 µSecs		4
.20 µSecs

Signed Integer Operations

OperationMinAvgMax
signed int +4
.20 µSecs		4
.20 µSecs		4
.20 µSecs
signed int -4
.20 µSecs		4
.20 µSecs		4
.20 µSecs
signed int *5
.25 µSecs		5
.25 µSecs		5
.25 µSecs
signed int /6
.30 µSecs		6
.30 µSecs		6
.30 µSecs
signed int %7
.35 µSecs		7
.35 µSecs		7
.35 µSecs
signed int >>4
.20 µSecs		4
.20 µSecs		4
.20 µSecs
signed int <<4
.20 µSecs		4
.20 µSecs		4
.20 µSecs
abs ()8
.40 µSecs		8
.40 µSecs		8
.40 µSecs

Unsigned Long Operations

OperationMinAvgMax
unsigned long +8
.40 µSecs		8
.40 µSecs		8
.40 µSecs
unsigned long -8
.40 µSecs		8
.40 µSecs		8
.40 µSecs
unsigned long *15
.75 µSecs		15
.75 µSecs		15
.75 µSecs
unsigned long /39
1.95 µSecs		39
1.95 µSecs		43
2.15 µSecs
unsigned long %39
1.95 µSecs		39
1.95 µSecs		43
2.15 µSecs
unsigned long >>8
.40 µSecs		13
.65 µSecs		16
.80 µSecs
unsigned long <<8
.40 µSecs		13
.65 µSecs		16
.80 µSecs

Signed Long Operations

OperationMinAvgMax
signed long +8
.40 µSecs		8
.40 µSecs		8
.40 µSecs
signed long -8
.40 µSecs		8
.40 µSecs		8
.40 µSecs
signed long *15
.75 µSecs		15
.75 µSecs		15
.75 µSecs
signed long /46
2.30 µSecs		53
2.65 µSecs		61
3.05 µSecs
signed long %46
2.30 µSecs		53
2.65 µSecs		61
3.05 µSecs
signed long >>8
.40 µSecs		13
.65 µSecs		16
.80 µSecs
signed long <<8
.40 µSecs		13
.65 µSecs		16
.80 µSecs
labs ()14
.70 µSecs		15
.75 µSecs		16
.80 µSecs

Floating-Point Operations

OperationMinAvgMax
float +58
2.90 µSecs		74
3.70 µSecs		132
6.60 µSecs
float -47
2.35 µSecs		75
3.75 µSecs		133
6.65 µSecs
float *64
3.20 µSecs		67
3.35 µSecs		71
3.55 µSecs
float /81
4.05 µSecs		84
4.20 µSecs		88
4.40 µSecs
fmod ()220
11.00 µSecs		299
14.95 µSecs		411
20.55 µSecs
modf ()169
8.45 µSecs		284
14.20 µSecs		310
15.50 µSecs
fabs ()51
2.55 µSecs		51
2.55 µSecs		53
2.65 µSecs
ceil ()289
14.45 µSecs		369
18.45 µSecs		392
19.60 µSecs
floor ()289
14.45 µSecs		369
18.45 µSecs		391
19.55 µSecs
pow ()177
8.85 µSecs		1,099
54.95 µSecs		3,716
185.80 µSecs
sqrt ()13
.65 µSecs		43
2.15 µSecs		77
3.85 µSecs
exp ()84
4.20 µSecs		96
4.80 µSecs		1,622
81.10 µSecs
log ()12
.60 µSecs		637
31.85 µSecs		1,526
76.30 µSecs
log10 ()47
2.35 µSecs		686
34.30 µSecs		1,591
79.55 µSecs
sin ()432
21.60 µSecs		1,091
54.55 µSecs		1,501
75.05 µSecs
cos ()402
20.10 µSecs		1,092
54.60 µSecs		1,508
75.40 µSecs
tan ()1,392
69.60 µSecs		1,521
76.05 µSecs		1,955
97.75 µSecs
asin ()178
8.90 µSecs		1,470
73.50 µSecs		1,925
96.25 µSecs
acos ()519
25.95 µSecs		1,578
78.90 µSecs		1,921
96.05 µSecs
atan ()686
34.30 µSecs		1,222
61.10 µSecs		1,645
82.25 µSecs
atan2 ()617
30.85 µSecs		1,359
67.95 µSecs		1,777
88.85 µSecs
sinh ()1,623
81.15 µSecs		3,546
177.30 µSecs		4,534
226.70 µSecs
cosh ()1,678
83.90 µSecs		3,543
177.15 µSecs		4,530
226.50 µSecs
tanh ()3,190
159.50 µSecs		3,467
173.35 µSecs		4,496
224.80 µSecs

Buffer Operations

OperationMinAvgMax
memset (10)47
2.35 µSecs		47
2.35 µSecs		47
2.35 µSecs
memset (100)407
20.35 µSecs		407
20.35 µSecs		407
20.35 µSecs
memset (1000)4,007
200.35 µSecs		4,007
200.35 µSecs		4,007
200.35 µSecs
memcpy (10)46
2.30 µSecs		46
2.30 µSecs		46
2.30 µSecs
memcpy (100)406
20.30 µSecs		406
20.30 µSecs		406
20.30 µSecs
memcpy (1000)4,006
200.30 µSecs		4,006
200.30 µSecs		4,006
200.30 µSecs
memmove
(10 with overlap)		100
5.00 µSecs		100
5.00 µSecs		100
5.00 µSecs
memmove
(100 with overlap)		820
41.00 µSecs		820
41.00 µSecs		820
41.00 µSecs
memmove
(1000 with overlap)		8,020
401.00 µSecs		8,020
401.00 µSecs		8,020
401.00 µSecs

Memory Allocation Operations

OperationMinAvgMax
malloc (),
99.5% successful		36
1.80 µSecs		148
7.40 µSecs		390
19.50 µSecs
free ()43
2.15 µSecs		176
8.80 µSecs		379
18.95 µSecs

Notes Note

  • These tests were performed and measured using the µVision Debugger. Test code was compiled with the C166 Version 5.03 C Compiler using the Small Memory Model and Optimization Level 7-SPEED.
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