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fpu: Fix repacking issues in the uncanonical step for E4M3 overflow

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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")
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Chao Liu <chao.liu.zevorn@gmail.com>
Signed-off-by: Max Chou <max.chou@sifive.com>
Message-ID: <20260226071817.1417875-2-max.chou@sifive.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
This commit is contained in:
Max Chou
2026-02-26 15:18:14 +08:00
committed by Alistair Francis
parent f2af8f0d5d
commit 053e913aad
1 changed files with 2 additions and 0 deletions
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2
fpu/softfloat-parts.c.inc
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@@ -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: