[PATCH] Fix to soft-fp underflow detection.

[Marcus Shawcroft <marcus dot shawcroft at linaro dot org>]

This patch addresses an issue in which soft-fp truncation fails to
raise underflow, the issue was found while porting glibc to aarch64,
relevant posts on libc-ports start here:

http://sourceware.org/ml/libc-ports/2012-11/msg00017.html

This patch has been tested by updating the copy of soft-fp  in gcc and
running the glibc test suite for aarch64.

OK?


/Marcus


2012-11-13  Marcus Shawcroft  <marcus.shawcroft@linaro.org>

        * soft-fp/op-common.h (_FP_PACK_SEMIRAW): Move underflow
        detection to immediately after _FP_ROUND().
        * soft-fp/soft-fp.h (_FP_ROUND): Don't round if working
        bits are 0.

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