Always false float comparisons

[tsbockman via Digitalmars-d]

On Wednesday, 18 May 2016 at 22:06:43 UTC, Era Scarecrow wrote:
> On Wednesday, 18 May 2016 at 21:02:03 UTC, tsbockman wrote:
>> Can you give me a source for this, or at least the name of the 
>> relevant op code? (I'm new to x86 assembly.)
>
> http://www.mathemainzel.info/files/x86asmref.html#mul
>
> http://www.intel.com/content/www/us/en/processors/architectures-software-developer-manuals.html

Thanks.

> [...]
> Downloading the 64 intel manual on opcodes says the same thing, 
> only the registers become RDX:RAX with 64bit instructions.
>
> Quadword RAX r/m64 RDX:RAX

I will look into adding intrinsics for full-width multiply and 
combined division-modulus.