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 -- View this message in context: http://old.nabble.com/multiply-operation-problem-tp26498218p26498218.html Sent from the gcc - Help mailing list archive at Nabble.com.
