Asm Float Comparisons

Second question first: No.

Use some variant of FCOM, and then FNSTSW to store the status word into (eg) EAX. Then test EAX for whatever bit pattern. I think the relevant bit patterns are in the MASM docs, but I can''t remember them now.

If you''re willing to assume Pentium Pro CPU or above, what you want is fcomi.
fcomi st0, st_i => ZF = (st0 == st_i), CF = (st0 < st_i), PF = error (NaN etc.; FPUCW.IM = 1)

HTH
Jan

What processors are considered pentium pro? (P2 and above?)

Also what if I don''t want to assume that, what instruction do i need then?

A pentium pro+ is considered Pentium Pro,Pentium II,Pentium III,Pentium IV

> A pentium pro+ is considered Pentium Pro,Pentium II,Pentium III,Pentium IV <
hehe. I think he meant non-Intel CPUs
This and all other Pentium Pro features are supported on Athlons; I dunno about Transmeta and Cyrix (in case anyone cares )

You can test if the processor supports fcomi:

mov	eax, 1
cpuid
mov	[feat_flags], edx
 

bits 0 and 15 must be set.

500x5

whats the compare instruction to compare 2 floats on 386 and above? There must be one.