Looking for good source of information on Intel internal floating-point representations.
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From: Todd Bezenek on 10 Feb 2010 04:56 I am looking for a good reference which will allow me to understand the issues involved with the precision of Intel floating-point calculations. The main focus is the fact that Intel uses an internal representation with more bits than the value will have when stored. The questions I want to be able to answer via the reference include: 1. How/when does the representation change when I load a value from memory into an x87 register, do a calculation on it, move it to another register, store it back to memory. 2. The same as (1), but using the xmm (SSE) registers to do computations with scalar floating-point values. 3. The same as (1, 2), but using the xmm (SSE) registers to do computations with packed floating-point values. Thank you for any pointers to a good reference. Something I can find on-line is preferred as always. -Todd -- Todd Bezenek Computer Architect and Performance Analyst |