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Thu, 05 Feb 2026 03:16:48 -0800 (PST) From: Richard Henderson To: qemu-devel@nongnu.org Cc: max.chou@sifive.com Subject: [PATCH v4 9/9] fpu: Add conversion routines for OCP FP4 E2M1 Date: Thu, 5 Feb 2026 21:16:22 +1000 Message-ID: <20260205111622.461497-10-richard.henderson@linaro.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260205111622.461497-1-richard.henderson@linaro.org> References: <20260205111622.461497-1-richard.henderson@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::630; envelope-from=richard.henderson@linaro.org; helo=mail-pl1-x630.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @linaro.org) X-ZM-MESSAGEID: 1770290285310158500 Content-Type: text/plain; charset="utf-8" From: Max Chou Signed-off-by: Max Chou [rth: Update for exp_max_kind] Signed-off-by: Richard Henderson --- include/fpu/softfloat-types.h | 1 + include/fpu/softfloat.h | 4 +++- fpu/softfloat.c | 26 ++++++++++++++++++++++++++ 3 files changed, 30 insertions(+), 1 deletion(-) diff --git a/include/fpu/softfloat-types.h b/include/fpu/softfloat-types.h index 9c84a101e5..ead146c22d 100644 --- a/include/fpu/softfloat-types.h +++ b/include/fpu/softfloat-types.h @@ -122,6 +122,7 @@ typedef uint16_t bfloat16; /* * Open Compute Project (OCP) Microscaling Formats */ +typedef uint8_t float4_e2m1; typedef uint8_t float8_e4m3; typedef uint8_t float8_e5m2; =20 diff --git a/include/fpu/softfloat.h b/include/fpu/softfloat.h index e45260f52d..1580d956d5 100644 --- a/include/fpu/softfloat.h +++ b/include/fpu/softfloat.h @@ -190,9 +190,11 @@ float128 uint64_to_float128(uint64_t, float_status *st= atus); float128 uint128_to_float128(Int128, float_status *status); =20 /*------------------------------------------------------------------------= ---- -| OCP FP8 conversion routines. +| OCP FP{4,8} conversion routines. *-------------------------------------------------------------------------= ---*/ =20 +float8_e4m3 float4_e2m1_to_float8_e4m3(float4_e2m1, float_status *status); + bfloat16 float8_e4m3_to_bfloat16(float8_e4m3, float_status *status); float8_e4m3 bfloat16_to_float8_e4m3(bfloat16, bool sat, float_status *stat= us); float8_e4m3 float32_to_float8_e4m3(float32, bool sat, float_status *status= ); diff --git a/fpu/softfloat.c b/fpu/softfloat.c index 9e31ddd85a..a8ba3cbdd1 100644 --- a/fpu/softfloat.c +++ b/fpu/softfloat.c @@ -574,6 +574,11 @@ typedef struct { .frac_shift =3D (-F - 1) & 63, \ .round_mask =3D (1ull << ((-F - 1) & 63)) - 1 =20 +static const FloatFmt float4_e2m1_params =3D { + FLOAT_PARAMS(2, 1), + .exp_max_kind =3D float_expmax_normal, +}; + static const FloatFmt float8_e4m3_params =3D { FLOAT_PARAMS(4, 3), .exp_max_kind =3D float_expmax_e4m3 @@ -641,6 +646,11 @@ static void unpack_raw64(FloatParts64 *r, const FloatF= mt *fmt, uint64_t raw) }; } =20 +static void QEMU_FLATTEN float4_e2m1_unpack_raw(FloatParts64 *p, float4_e2= m1 f) +{ + unpack_raw64(p, &float4_e2m1_params, f); +} + static void QEMU_FLATTEN float8_e4m3_unpack_raw(FloatParts64 *p, float8_e4= m3 f) { unpack_raw64(p, &float8_e4m3_params, f); @@ -1709,6 +1719,13 @@ static const uint16_t rsqrt_tab[128] =3D { * Pack/unpack routines with a specific FloatFmt. */ =20 +static void float4_e2m1_unpack_canonical(FloatParts64 *p, float4_e2m1 f, + float_status *s) +{ + float4_e2m1_unpack_raw(p, f); + parts_canonicalize(p, s, &float4_e2m1_params); +} + static void float8_e4m3_unpack_canonical(FloatParts64 *p, float8_e4m3 f, float_status *s) { @@ -2900,6 +2917,15 @@ static void parts_float_to_float_widen(FloatParts128= *a, FloatParts64 *b, } } =20 +float8_e4m3 float4_e2m1_to_float8_e4m3(float4_e2m1 a, float_status *s) +{ + FloatParts64 p; + + float4_e2m1_unpack_canonical(&p, a, s); + parts_float_to_float(&p, s); + return float8_e4m3_round_pack_canonical(&p, s, false); +} + bfloat16 float8_e4m3_to_bfloat16(float8_e4m3 a, float_status *s) { FloatParts64 p; --=20 2.43.0