[Nasm-bugs] [Bug 3392787] fsub instruction emitted as fsubp

[noreply-nasm at dev.nasm.us]

https://bugzilla.nasm.us/show_bug.cgi?id=3392787

negge at dgql.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |INVALID
                 CC|                            |negge at dgql.org
             Status|OPEN                        |RESOLVED

--- Comment #1 from negge at dgql.org ---
According to the Intel IA-32 Architectures Software Developer’s Manual, it
looks like this is now the correct behavior to remain backwards compatible with
previous assemblers that interpreted a no-operand FSUB as FSUBP instead of FSUB
ST0, ST1.

>From page 395, chapter 3, volume 2A of
https://www.intel.com/content/dam/www/public/us/en/documents/manuals/64-ia-32-architectures-software-developer-instruction-set-reference-manual-325383.pdf

> The no-operand version of the floating-point subtract instructions always results in the register stack being popped. In some assemblers, the mnemonic for this instruction is FSUB rather than FSUBP.

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