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PR middle-end/91450 * internal-fn.c (expand_mul_overflow): For s1 * s2 -> ur, if one operand is negative and one non-negative, compare the non-negative one against 0 rather than comparing s1 & s2 against 0. Otherwise, don't compare (s1 & s2) == 0, but compare separately both s1 == 0 and s2 == 0, unless one of them is known to be negative. Remove tem2 variable, use tem where tem2 has been used before. * gcc.c-torture/execute/pr91450-1.c: New test. * gcc.c-torture/execute/pr91450-2.c: New test. From-SVN: r278437
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