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The following patch is an incremental change to the PR30314 enhancement, this one handles signed types. For signed types (but still, the same for 1st and result element type and non-zero constant that fits into that type), we actually need to watch for overflow in direction to positive and negative infinity and it also depends on whether the cst operand is positive or negative. For __builtin_mul_overflow_p (x, cst, (stype) 0): For cst > 0, we can simplify it to: x > INT_MAX / cst || x < INT_MIN / cst aka: x + (unsigned) (INT_MIN / cst) > (unsigned) (INT_MAX / cst) - (unsigned) (INT_MIN / cst) and for cst < 0 to: x < INT_MAX / cst || x > INT_MIN / cst aka: x + (unsigned) (INT_MAX / cst) > (unsigned) (INT_MIN / cst) - (unsigned) (INT_MAX / cst) Additionally, I've added executable testcases, so we don't just check for the optimization to be performed, but also that it is correct (done that even for the other PR's testcase). 2022-06-03 Jakub Jelinek <jakub@redhat.com> PR middle-end/30314 PR middle-end/105777 * match.pd (__builtin_mul_overflow_p (x, cst, (stype) 0) -> x > stype_max / cst || x < stype_min / cst): New simplification. * gcc.dg/tree-ssa/pr30314.c: Add noipa attribute to all functions. * gcc.dg/tree-ssa/pr105777.c: New test. * gcc.c-torture/execute/pr30314.c: New test. * gcc.c-torture/execute/pr105777.c: New test. |
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