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[libc][printf] Fix out-of-range shift in float320 printf #144542

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Merged
merged 1 commit into from
Jun 18, 2025
Merged

[libc][printf] Fix out-of-range shift in float320 printf #144542

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5 changes: 4 additions & 1 deletion libc/src/__support/FPUtil/dyadic_float.h
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Original file line number Diff line number Diff line change
Expand Up @@ -465,7 +465,10 @@ template <size_t Bits> struct DyadicFloat {
// exponents coming in to this function _shouldn't_ be that large). The
// result should always end up as a positive size_t.
size_t shift = -static_cast<size_t>(exponent);
new_mant >>= shift;
if (shift >= Bits)
new_mant = 0;
else
new_mant >>= shift;
round_dir = rounding_direction(mantissa, shift, sign);
if (round_dir > 0)
++new_mant;
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