Re:9999999999999999.0 – 9999999999999998.0
by gpderetta on Monday January 07, 2019 @07:45PM
(#18851854)
>The x87 ISA does, yes, and they are supported for binary compatibility reasons.
Well x86-64 is not binary compatible with x86 so that's not the reason. It is mostly for software relying on either the rounding quirks or the extended 80 bit precision I guess.
> However the actual x87 registers are shadowed by the vector registers so you can only use one
You are confusing with the legacy MMX registers which are deader than the x87 for stack. XMM registers do not shadow the for stack.
Well x86-64 is not binary compatible with x86 so that's not the reason. It is mostly for software relying on either the rounding quirks or the extended 80 bit precision I guess.
> However the actual x87 registers are shadowed by the vector registers so you can only use one
You are confusing with the legacy MMX registers which are deader than the x87 for stack. XMM registers do not shadow the for stack.