From: Jay Link (jlink@interlink-bbs.com)
Date: Fri 10 Mar 2000 - 17:40:36 IST
This is somewhat off-topic, but I figure if anyone can answer it, you guys can. Thanks. ========== Ok, you smart guys, how do I get the upper 32 bits of a number when using a 32-bit compiler? I.e., >> 32 would work on a 64-bit system, but you can't do that on an x86, right? Here's an example using a "Watcom" compiler: /*------------------------------------------------------------------------* BIGMUL -> 32bit * 32bit = 64bit. We need the upper 32 bit. On a 64-bit compiler, it would be (num1 * num2) >> 32; *------------------------------------------------------------------------*/ int BIGMUL(int a, int b); #pragma aux BIGMUL = \ "imul edx" \ parm [eax] [edx] \ value [edx]; How I rewrite this for gcc? Thanks! -Jay
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