Fix a regression in GCC 10/11/12 where some union structures could get miscompiled when optimizations are enabled: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105860 Taken from upstream: https://gcc.gnu.org/g:16afe2e2862f3dd93c711d7f8d436dee23c6c34d diff --git a/gcc/tree-sra.c b/gcc/tree-sra.c index 09d951a261b..420329f63f6 100644 --- a/gcc/tree-sra.c +++ b/gcc/tree-sra.c @@ -1647,7 +1647,18 @@ build_ref_for_offset (location_t loc, tree base, poly_int64 offset, static tree build_reconstructed_reference (location_t, tree base, struct access *model) { - tree expr = model->expr, prev_expr = NULL; + tree expr = model->expr; + /* We have to make sure to start just below the outermost union. */ + tree start_expr = expr; + while (handled_component_p (expr)) + { + if (TREE_CODE (TREE_TYPE (TREE_OPERAND (expr, 0))) == UNION_TYPE) + start_expr = expr; + expr = TREE_OPERAND (expr, 0); + } + + expr = start_expr; + tree prev_expr = NULL_TREE; while (!types_compatible_p (TREE_TYPE (expr), TREE_TYPE (base))) { if (!handled_component_p (expr)) ref='/guix/'>summaryrefslogtreecommitdiff
path: root/gnu/packages/patches/zig-use-system-paths.patch
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