multiply operation problem

[rohitgeek]

Hi,

I am trying to port a new processor for gcc. Currently, i am able to compile
normal arithmetic and logical instructions by defining respective patterns
in md file. I am stuck at a point where i try to do 16 x 16 multiply
operation to produce 32 bit result and architecture of processor is 32 bit.

1. I am using mulhisi3 pattern but gcc is not picking that up to generate
assembly.
2. Do i need to define particular macros to do operations in HImode ( 16
bit).
3. I am using typecasting in my c program that should logically put 32 bit
result in register, this is my test case



short int a;
short int b;
int c;

a= 10;
b=5;
c = (int) a * b;


I think the problem is in typecasting beacuse in the assembly generated , 0
is moved into the registers and they are multiplied, mean somehow it is not
recongnising what to do in is size modified multiplication.


Please help

Thanks in advance


Rohit 
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