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| author | Matheus Ferst | 2022-03-30 19:59:27 +0200 |
|---|---|---|
| committer | Daniel Henrique Barboza | 2022-04-20 23:00:30 +0200 |
| commit | f279852b89bd42289c421714221c860e71fb4639 (patch) | |
| tree | b02e6605f1e68b8755d63dabcfa3b6ca4bad7ee8 /fpu | |
| parent | qemu/int128: add int128_urshift (diff) | |
| download | qemu-f279852b89bd42289c421714221c860e71fb4639.tar.gz qemu-f279852b89bd42289c421714221c860e71fb4639.tar.xz qemu-f279852b89bd42289c421714221c860e71fb4639.zip | |
softfloat: add uint128_to_float128
Based on parts_uint_to_float, implements uint128_to_float128 to convert
an unsigned 128-bit value received through an Int128 argument.
Signed-off-by: Matheus Ferst <matheus.ferst@eldorado.org.br>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220330175932.6995-4-matheus.ferst@eldorado.org.br>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Diffstat (limited to 'fpu')
| -rw-r--r-- | fpu/softfloat.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/fpu/softfloat.c b/fpu/softfloat.c index 7f524d4377..57445b36e7 100644 --- a/fpu/softfloat.c +++ b/fpu/softfloat.c @@ -3969,6 +3969,31 @@ float128 uint64_to_float128(uint64_t a, float_status *status) return float128_round_pack_canonical(&p, status); } +float128 uint128_to_float128(Int128 a, float_status *status) +{ + FloatParts128 p = { }; + int shift; + + if (int128_nz(a)) { + p.cls = float_class_normal; + + shift = clz64(int128_gethi(a)); + if (shift == 64) { + shift += clz64(int128_getlo(a)); + } + + p.exp = 127 - shift; + a = int128_lshift(a, shift); + + p.frac_hi = int128_gethi(a); + p.frac_lo = int128_getlo(a); + } else { + p.cls = float_class_zero; + } + + return float128_round_pack_canonical(&p, status); +} + /* * Minimum and maximum */ |