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FEAT_RPRES implements an "increased precision" variant of the single precision FRECPE and FRSQRTE instructions from an 8 bit to a 12 bit mantissa. This applies only when FPCR.AH == 1. Note that the halfprec and double versions of these insns retain the 8 bit precision regardless. In this commit we add all the plumbing to make these instructions call a new helper function when the increased-precision is in effect. In the following commit we will provide the actual change in behaviour in the helpers. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> |
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