[PATCH 1/3] fpu: Fix repacking issues in the uncanonical step for E4M3 overflow

[Max Chou]

In the uncanonical step, the input FloatParts will be repacked to the
target FloatFmt. This commit fixes following issues after calling
uncanon_e4m3_overflow in the uncanon/uncanon_normal functions.

- Add the local exp update after calling uncanon_e4m3_overflow in the
  parts_uncanon_normal function.
- Add the fraction shift after calling uncanon_e4m3_overflow in the
  parts_uncanon function.

Fixes: 27e989f99c ("fpu: Add conversion routines for OCP FP8 E4M3")
Signed-off-by: Max Chou <max.c...@sifive.com>
---
 fpu/softfloat-parts.c.inc | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fpu/softfloat-parts.c.inc b/fpu/softfloat-parts.c.inc
index 61b07307bf..a738758aee 100644
--- a/fpu/softfloat-parts.c.inc
+++ b/fpu/softfloat-parts.c.inc
@@ -387,6 +387,7 @@ static void partsN(uncanon_normal)(FloatPartsN *p, 
float_status *s,
             case float_expmax_e4m3:
                 if (exp > exp_max || p->frac_hi > E4M3_NORMAL_FRAC_MAX) {
                     partsN(uncanon_e4m3_overflow)(p, s, fmt, overflow_norm);
+                    exp = p->exp;
                 }
                 break;
 
@@ -496,6 +497,7 @@ static void partsN(uncanon)(FloatPartsN *p, float_status *s,
                 break;
             case float_expmax_e4m3:
                 partsN(uncanon_e4m3_overflow)(p, s, fmt, saturate);
+                frac_shr(p, fmt->frac_shift);
                 break;
             case float_expmax_normal:
             default:
-- 
2.52.0