Whilst reading the GCC man page documentation for the -mfpmath option, I came
across this sentence for -mfpmath=sse:
The resulting code should be considerably faster in the major-
ity of cases and avoid the numerical instability problems of
387 code, but may break some existing code that expects tempo-
raries to be 80bit.
Can someone point me to a description of these "numerical instability problems
of 387 code", please?
I've searched the GCC site & mailing lists, and I've searched with Google, but
I can't find anything that details the particular concerns that led to this
note in the manual. All I can find is a list message containing the patch that
put it into the man page.
GCC is version 3.3.5 on this system.
Neil.
