How to convert an integer to a floating point value in x86 ASM?

Question

I need to multiply an integer (two's compliment) by a floating point constant. Here is what I have:

.data
pi  dd 3.14
int dd 0ah


.code
fld pi

???

fmul ST(1), ST

How can I convert int to a floating point value for multiplying against pi?

Answer 1

You need the fild instruction. Here's one reference: http://www.website.masmforum.com/tutorials/fptute/fpuchap5.htm