https://gcc.gnu.org/bugzilla/show_bug.cgi?id=28794
--- Comment #8 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The trunk branch has been updated by Andrew Pinski <pins...@gcc.gnu.org>: https://gcc.gnu.org/g:aadc5c07feb0ab08729ab25d0d896b55860ad9e6 commit r14-3084-gaadc5c07feb0ab08729ab25d0d896b55860ad9e6 Author: Andrew Pinski <apin...@marvell.com> Date: Mon Aug 7 00:05:21 2023 -0700 VR-VALUES [PR28794]: optimize compare assignments also This patch fixes the oldish (2006) bug where VRP was not optimizing the comparison for assignments while handling them for GIMPLE_COND only. It just happens to also solves PR 103281 due to allowing to optimize `c < 1` to `c == 0` and then we get `(c == 0) == c` (which was handled by r14-2501-g285c9d04). OK? Bootstrapped and tested on x86_64-linux-gnu with no regressions. PR tree-optimization/103281 PR tree-optimization/28794 gcc/ChangeLog: * vr-values.cc (simplify_using_ranges::simplify_cond_using_ranges_1): Split out majority to ... (simplify_using_ranges::simplify_compare_using_ranges_1): Here. (simplify_using_ranges::simplify_casted_cond): Rename to ... (simplify_using_ranges::simplify_casted_compare): This and change arguments to take op0 and op1. (simplify_using_ranges::simplify_compare_assign_using_ranges_1): New method. (simplify_using_ranges::simplify): For tcc_comparison assignments call simplify_compare_assign_using_ranges_1. * vr-values.h (simplify_using_ranges): Add new methods, simplify_compare_using_ranges_1 and simplify_compare_assign_using_ranges_1. Rename simplify_casted_cond and simplify_casted_compare and update argument types. gcc/testsuite/ChangeLog: * gcc.dg/tree-ssa/pr103281-1.c: New test. * gcc.dg/tree-ssa/vrp-compare-1.c: New test.
