[PATCH v6 1/9] fpu: Fix biased exponent write in parts_float_to_e5m2 saturate path

[Max Chou]

FloatParts64.exp holds an unbiased exponent. Subtract exp_bias to store
the unbiased equivalent of the max-normal biased exponent.

Fixes: d8be49537658 ("fpu: Add conversion routines for OCP FP8 E5M2")
Signed-off-by: Max Chou <max.c...@sifive.com>
---
 fpu/softfloat.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fpu/softfloat.c b/fpu/softfloat.c
index bc244a44ff..e2e53c1d68 100644
--- a/fpu/softfloat.c
+++ b/fpu/softfloat.c
@@ -2435,7 +2435,8 @@ static void parts_float_to_e5m2(FloatParts64 *a, 
float_status *s, bool saturate)
         /* Per OCP, conversion in SATURATE mode bounds Inf to MAX. */
         if (saturate) {
             a->cls = float_class_normal;
-            a->exp = float8_e5m2_params.exp_max - 1;
+            a->exp = (float8_e5m2_params.exp_max - 1 -
+                float8_e5m2_params.exp_bias);
             a->frac = MAKE_64BIT_MASK(float8_e5m2_params.frac_shift,
                                       float8_e5m2_params.frac_size + 1);
         }
-- 
2.55.0