https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113756
--- Comment #4 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Jakub Jelinek <ja...@gcc.gnu.org>: https://gcc.gnu.org/g:29998cc8a21b3a52f706275923166cd1f95d0555 commit r14-8837-g29998cc8a21b3a52f706275923166cd1f95d0555 Author: Jakub Jelinek <ja...@redhat.com> Date: Wed Feb 7 10:59:06 2024 +0100 range-op: Fix up ABSU_EXPR handling [PR113756] ABSU_EXPR unary expr is special because it has a signed integer argument and unsigned integer result (of the same precision). The following testcase is miscompiled since ABSU_EXPR handling has been added to range-op because it uses widest_int::from with the result sign (i.e. UNSIGNED) rather than the operand sign (i.e. SIGNED), so e.g. for the 32-bit int argument mask ends up 0xffffffc1 or something similar and even when it has most significant bit in the precision set, in widest_int (tree-ssa-ccp.cc really should stop using widest_int, but that is I think stage1 task) it doesn't appear to be negative and so bit_value_unop ABSU_EXPR doesn't set the resulting mask/value from oring of the argument and its negation. Fixed thusly, not doing that for GIMPLE_BINARY_RHS because I don't know about a binary op that would need something similar. 2024-02-06 Jakub Jelinek <ja...@redhat.com> PR tree-optimization/113756 * range-op.cc (update_known_bitmask): For GIMPLE_UNARY_RHS, use TYPE_SIGN (lh.type ()) instead of sign for widest_int::from of lh_bits value and mask. * gcc.dg/pr113756.c: New test.
