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ubsan: signed integer multiply overflow

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9223371018427387904 * 2 cannot be represented in type 'long', yes, but
we don't care.

	* expr.c (expr): Avoid signed overflow.
This commit is contained in:
Alan Modra
2022-01-01 13:52:53 +10:30
parent ad3d14c47e
commit 487b0ff02d
1 changed files with 6 additions and 1 deletions
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7
gas/expr.c
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@ -1959,7 +1959,12 @@ expr (int rankarg, /* Larger # is higher rank. */
switch (op_left) switch (op_left)
{ {
default: goto general; default: goto general;
case O_multiply: resultP->X_add_number *= v; break; case O_multiply:
/* Do the multiply as unsigned to silence ubsan. The
result is of course the same when we throw away high
bits of the result. */
resultP->X_add_number *= (valueT) v;
break;
case O_divide: resultP->X_add_number /= v; break; case O_divide: resultP->X_add_number /= v; break;
case O_modulus: resultP->X_add_number %= v; break; case O_modulus: resultP->X_add_number %= v; break;
case O_left_shift: case O_left_shift: