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softfloat: Pad array size in pick_nan_muladd

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While all indices into val[] should be in [0-2], the mask
applied is two bits.  To help static analysis see there is
no possibility of read beyond the end of the array, pad the
array to 4 entries, with the final being (implicitly) NULL.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-id: 20241203203949.483774-6-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Richard Henderson 2024-12-11 15:31:08 +00:00 • committed by Peter Maydell
parent 229416c67e
commit 8704c753e8
1 changed files with 1 additions and 1 deletions
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2
fpu/softfloat-parts.c.inc
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@ -106,7 +106,7 @@ static FloatPartsN *partsN(pick_nan_muladd)(FloatPartsN *a, FloatPartsN *b,
}
ret = c;
} else {
FloatPartsN *val[3] = { a, b, c };
FloatPartsN *val[R_3NAN_1ST_MASK + 1] = { a, b, c };
Float3NaNPropRule rule = s->float_3nan_prop_rule;
assert(rule != float_3nan_prop_none);