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author | Alex Bennée | 2017-07-03 15:30:06 +0200 |
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committer | Alex Bennée | 2018-02-21 11:20:14 +0100 |
commit | 210cbd4910ae9e41e0a1785b96890ea2c291b381 (patch) | |
tree | 91c1773b4d572283cd3e3e1a20db7db7b892b9c9 /fpu | |
parent | Merge remote-tracking branch 'remotes/kraxel/tags/ui-20180220-pull-request' i... (diff) | |
download | qemu-210cbd4910ae9e41e0a1785b96890ea2c291b381.tar.gz qemu-210cbd4910ae9e41e0a1785b96890ea2c291b381.tar.xz qemu-210cbd4910ae9e41e0a1785b96890ea2c291b381.zip |
fpu/softfloat: implement float16_squash_input_denormal
This will be required when expanding the MINMAX() macro for 16
bit/half-precision operations.
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Diffstat (limited to 'fpu')
-rw-r--r-- | fpu/softfloat.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/fpu/softfloat.c b/fpu/softfloat.c index 433c5dad2d..3a4ab1355f 100644 --- a/fpu/softfloat.c +++ b/fpu/softfloat.c @@ -3488,6 +3488,21 @@ static float16 roundAndPackFloat16(flag zSign, int zExp, return packFloat16(zSign, zExp, zSig >> 13); } +/*---------------------------------------------------------------------------- +| If `a' is denormal and we are in flush-to-zero mode then set the +| input-denormal exception and return zero. Otherwise just return the value. +*----------------------------------------------------------------------------*/ +float16 float16_squash_input_denormal(float16 a, float_status *status) +{ + if (status->flush_inputs_to_zero) { + if (extractFloat16Exp(a) == 0 && extractFloat16Frac(a) != 0) { + float_raise(float_flag_input_denormal, status); + return make_float16(float16_val(a) & 0x8000); + } + } + return a; +} + static void normalizeFloat16Subnormal(uint32_t aSig, int *zExpPtr, uint32_t *zSigPtr) { |