From 7022b9dd107e534896d8383f6bc4ce70b4726cc9 Mon Sep 17 00:00:00 2001 From: Philip Herron Date: Thu, 4 Aug 2022 20:25:59 +0100 Subject: Fix bad transmute for aggregate types This changes the CONVERT_EXPR to use the same *(foo*)&bar style cast from the c front-end to handle the case of: int a[1]; int b = (int)a; Which is converted into: int b = *(int*)&a; which the constant folders can turn directly into int b = a[0]; Fixes #1432 --- gcc/rust/backend/rust-compile-intrinsic.cc | 18 ++++++++++++++++-- 1 file changed, 16 insertions(+), 2 deletions(-) (limited to 'gcc/rust/backend') diff --git a/gcc/rust/backend/rust-compile-intrinsic.cc b/gcc/rust/backend/rust-compile-intrinsic.cc index 65eddfa..88d7923 100644 --- a/gcc/rust/backend/rust-compile-intrinsic.cc +++ b/gcc/rust/backend/rust-compile-intrinsic.cc @@ -545,8 +545,22 @@ transmute_intrinsic_handler (Context *ctx, TyTy::BaseType *fntype_tyty) tree result_expr = error_mark_node; if (AGGREGATE_TYPE_P (TREE_TYPE (convert_me_expr))) { - result_expr = fold_build1_loc (Location ().gcc_location (), CONVERT_EXPR, - result_type_tree, convert_me_expr); + // Return *(orig_type*)&decl. */ + // tree t = build_fold_addr_expr_loc (location.gcc_location (), this->t_); + // t = fold_build1_loc (location.gcc_location (), NOP_EXPR, + // build_pointer_type (this->orig_type_), t); + // return build_fold_indirect_ref_loc (location.gcc_location (), t); + + // result_expr = fold_build1_loc (Location ().gcc_location (), + // CONVERT_EXPR, + // result_type_tree, convert_me_expr); + + tree t = build_fold_addr_expr_loc (Location ().gcc_location (), + convert_me_expr); + t = fold_build1_loc (Location ().gcc_location (), NOP_EXPR, + build_pointer_type (target_type_expr), t); + result_expr + = build_fold_indirect_ref_loc (Location ().gcc_location (), t); } else { -- cgit v1.1