tests/mpq/t-get_d.c failure on m68k-linux
nisse at lysator.liu.se
Mon Feb 18 08:36:26 CET 2013
Aldy Hernandez <aldyh at redhat.com> writes:
> [Disclaimer: I am not a 68k guru. Well, for that matter neither am I
> an FP guru...:)].
Neither am I...
> This means that EQ/NE comparisons with FP values on 68k are extremely
> problematic because the programmer has no way of knowing if the values
> are in memory or in the FP registers. For example, the compiler may
> have spilled an FPR to memory and read it back, thus losing some
> precision, causing the equality to fail.
> I suggest running the testcase (and possibly all of GMP) with
> -ffloat-store on m68k.
I think I've seen other code which declares certain double variables as
volatile, to force the compiler to store them in memory. Maybe that
would be a more local and portable workaround?
Niels Möller. PGP-encrypted email is preferred. Keyid C0B98E26.
Internet email is subject to wholesale government surveillance.
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