Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
21 years ago

Small C Lib

I was generating a small project in the IDE to give some benchmarks on code size for different compiler/linker options. The program was the hello_world + the following: double x, y, z; ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
21 years ago

--- Quote Start ---

originally posted by rppolicy@Jan 14 2005, 09:33 AM

i was generating a small project in the ide to give some benchmarks on code size for different compiler/linker options. the program was the hello_world + the following:

double x, y, z;

printf("hello from nios ii!\n");

x = 1.2;

y = 3.5;

z = x + y;

printf("x+y = %.02lf\n", z);

z = x - y;

printf("x-y = %.02lf\n", z);

z = x * y;

printf("x*y = %.02lf\n", z);

z = x / y;

printf("x/y = %.02lf\n", z);

when all was compiled and linked with default options, the size was 61k. so i turned on the small c and reduce driver options in the system, and the code dropped to a waluping 18k! it looked supicious, so i looked up what you lose in the small c. floating point is not supported in printf. hum! why didn't the compiler/linker warn me. there were no errors or warnings with the above code + small c options. what exactly did the compiler generate? don't have a target to load it to yet, so i can't see what was generated. just curious. i am dissapointed that i was not warned about the no support of floating point in the printf. how many other things are hidden that we are not being warned about? thoughts....

rick

--- Quote End ---

The NIOS doc does mention what is missing in the small lib!