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2012 Oct 08
3
[LLVMdev] Multiply i8 operands promotes to i32
...ot possible, how can I detect when lowering that it is actually a MUL_I8 or MUL_I16 in order to do the correct lowering? Thanks in advance, Pedro P.S: I add C code and corresponding LLVM code. C code: void (const u_int16_t in_data, u_int16_t* out) { u_int8_t kk = in_data&0xFF; u_int16_t kk16 = kk * kk; *out = kk16; } LLVM: %1 = load i8* %kk, align 1 %conv2 = zext i8 %1 to i32 %2 = load i8* %kk, align 1 %conv3 = zext i8 %2 to i32 %mul = mul nsw i32 %conv2, %conv3 %conv4 = trunc i32 %mul to i16 store i16 %conv4, i16* %kk16, align 2 -- Pedro Malagón - Profesor ayudante...