https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90090
Jakub Jelinek <jakub at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |ASSIGNED Assignee|unassigned at gcc dot gnu.org |jakub at gcc dot gnu.org Ever confirmed|0 |1 --- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> --- --- gcc/tree-ssa-math-opts.c.jj 2019-04-08 10:11:28.620219138 +0200 +++ gcc/tree-ssa-math-opts.c 2019-04-15 09:42:22.173868303 +0200 @@ -334,7 +334,8 @@ is_division_by (gimple *use_stmt, tree d /* Do not recognize x / x as valid division, as we are getting confused later by replacing all immediate uses x in such a stmt. */ - && gimple_assign_rhs1 (use_stmt) != def; + && gimple_assign_rhs1 (use_stmt) != def + && !stmt_can_throw_internal (cfun, use_stmt); } /* Return TRUE if USE_STMT is a multiplication of DEF by A. */ @@ -367,13 +368,12 @@ is_division_by_square (gimple *use_stmt, { if (gimple_code (use_stmt) == GIMPLE_ASSIGN && gimple_assign_rhs_code (use_stmt) == RDIV_EXPR - && gimple_assign_rhs1 (use_stmt) != gimple_assign_rhs2 (use_stmt)) + && gimple_assign_rhs1 (use_stmt) != gimple_assign_rhs2 (use_stmt) + && !stmt_can_throw_internal (cfun, use_stmt)) { tree denominator = gimple_assign_rhs2 (use_stmt); if (TREE_CODE (denominator) == SSA_NAME) - { - return is_square_of (SSA_NAME_DEF_STMT (denominator), def); - } + return is_square_of (SSA_NAME_DEF_STMT (denominator), def); } return 0; } fixes this.