Bug#327351: gcc-4.0: Gcc miscompiles libc on hppa - breaks rounding
"Wesley W. Terpstra" <wesley@terpstra.ca> writes:
> On Sep 9, 2005, at 3:46 PM, Falk Hueffner wrote:
> I don't know it either, but what you propose doesn't compile.
> It complains about invalid argument when the 0() is removed.
OK, it seems these instructions actually don't like nonzero offsets.
> So, this appears to work (compile and give proper results):
>
> __asm__ ("fstd %%fr0,0(%1)" : "=m" (*sw) : "r" (sw));
> sw[0] &= ~FE_DOWNWARD;
> sw[0] |= round;
> __asm__ ("fldd 0(%1), %%fr0" :: "m" (*sw), "r" (sw));
>
> Is this doing the right thing now?
Actually, I just noticed that sw[1] is probably also accessed. So
you'd add it too. Then it should work.
--
Falk
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