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authorPeter Maydell <peter.maydell@linaro.org>2014-01-06 11:47:21 +0000
committerPeter Maydell <peter.maydell@linaro.org>2014-01-08 19:07:22 +0000
commit38970efafdfa8a992c177563c4f0d77062b88fd9 (patch)
tree26655e0f499abbc1256856473823e0df70c7e2bd /tests
parent9df90ad078ec782d1339bd6879b6ea117f9759f7 (diff)
softfloat: Fix exception flag handling for float32_to_float16()
Our float32 to float16 conversion routine was generating the correct numerical answers, but not always setting the right set of exception flags. Fix this, mostly by rearranging the code to more closely resemble RoundAndPackFloat*, and in particular: * non-IEEE halfprec always raises Invalid for input NaNs * we need to check for the overflow case before underflow * we weren't getting the tininess-detected-after-rounding case correct (somewhat academic since only ARM uses halfprec and it is always tininess-detected-before-rounding) * non-IEEE halfprec overflow raises only Invalid, not Invalid + Inexact * we weren't setting Inexact when we should Also add some clarifying comments about what the code is doing. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Richard Henderson <rth@twiddle.net>
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