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X-Received-From: 2a00:1450:400c:c09::242 Subject: [Qemu-devel] [PATCH v2 01/20] fpu/softfloat: implement float16_squash_input_denormal X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: =?UTF-8?q?Alex=20Benn=C3=A9e?= , qemu-devel@nongnu.org, Aurelien Jarno Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZohoMail: RDKM_2 RSF_0 Z_629925259 SPT_0 This will be required when expanding the MINMAX() macro for 16 bit/half-precision operations. Signed-off-by: Alex Benn=C3=A9e Reviewed-by: Richard Henderson Reviewed-by: Peter Maydell --- fpu/softfloat.c | 15 +++++++++++++++ include/fpu/softfloat.h | 1 + 2 files changed, 16 insertions(+) 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 z= Exp, return packFloat16(zSign, zExp, zSig >> 13); } =20 +/*------------------------------------------------------------------------= ---- +| 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 valu= e. +*-------------------------------------------------------------------------= ---*/ +float16 float16_squash_input_denormal(float16 a, float_status *status) +{ + if (status->flush_inputs_to_zero) { + if (extractFloat16Exp(a) =3D=3D 0 && extractFloat16Frac(a) !=3D 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) { diff --git a/include/fpu/softfloat.h b/include/fpu/softfloat.h index 0f96a0edd1..d5e99667b6 100644 --- a/include/fpu/softfloat.h +++ b/include/fpu/softfloat.h @@ -277,6 +277,7 @@ void float_raise(uint8_t flags, float_status *status); | 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 valu= e. *-------------------------------------------------------------------------= ---*/ +float16 float16_squash_input_denormal(float16 a, float_status *status); float32 float32_squash_input_denormal(float32 a, float_status *status); float64 float64_squash_input_denormal(float64 a, float_status *status); =20 --=20 2.15.1