261cdd2319
The following tries to handle overflow in the integer computations done by lambda ops of dependence analysis by failing instead of silently continuing with overflowed values. It also avoids treating large unsigned CHREC_RIGHT as negative unless the chrec is of pointer type and avoids the most negative integer value to avoid excessive overflow checking (with this the fix for PR98758 can be partly simplified as seen). I've added add_hwi and mul_hwi functions computing HOST_WIDE_INT signed sum and product with indicating overflow, they hopefully get matched to the appropriate internal functions. I don't have any testcases triggering overflow in any of the guarded computations. 2021-01-20 Richard Biener <rguenther@suse.de> * hwint.h (add_hwi): New function. (mul_hwi): Likewise. * tree-data-ref.c (initialize_matrix_A): Properly translate tree constants and avoid HOST_WIDE_INT_MIN. (lambda_matrix_row_add): Avoid undefined integer overflow and return true on such overflow. (lambda_matrix_right_hermite): Handle overflow from lambda_matrix_row_add gracefully. Simplify previous fix. (analyze_subscript_affine_affine): Likewise. |
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