Add another fma test

[Andreas Jaeger]

On 06/14/2013 10:39 PM, Joseph S. Myers wrote:
> When I reviewed some MIPS test results after my math-tests.h addition,
> I was suspicious that in one respect they looked too good: the
> math/test-ldouble results showed no fma failures, despite the existing
> implementations of fma requiring FE_TOWARDZERO and FE_INEXACT support
> to work for the relevant types (and math-tests.h only being about
> tests using particular features directly, not about what's internally
> used in the implementation of a function).
>
> This patch adds an fma test for ldbl-128 to libm-test.inc that fails
> if the code needing FE_TOWARDZERO gets run in round-to-nearest instead
> (such tests already are present for float and double, and I'm not
> aware of any ldbl-96 systems for which such lack of exception /
> rounding mode support is an issue).  Tested on MIPS64 that this does
> show the desired failure in test-ldouble.out.
>
> (Bug 13304 is the bug for defective fma functions in the absence of
> FE_TOWARDZERO / FE_INEXACT support for the relevant types, and for
> ldbl-128ibm.)

ok, thanks,

Andreas
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