From cfe1ad3c488693a10fafb39d68c8cabc6e48daa7 Mon Sep 17 00:00:00 2001 From: Richard Biener Date: Tue, 17 Dec 2024 11:23:02 +0100 Subject: [PATCH] middle-end/118062 - bogus lowering of vector compares The generic expand_vector_piecewise routine supports lowering of a vector operation to vector operations of smaller size. When computing the extract position from the larger vector it uses the element size in bits of the original result vector to determine the number of elements in the smaller vector. That is wrong when lowering a compare as the vector element size of a bool vector does not have to agree with that of the compare operand. The following simplifies this, fixing the error. PR middle-end/118062 * tree-vect-generic.cc (expand_vector_piecewise): Properly compute delta. --- gcc/tree-vect-generic.cc | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/gcc/tree-vect-generic.cc b/gcc/tree-vect-generic.cc index 78f6e552cc7b..4b9cf734bdd1 100644 --- a/gcc/tree-vect-generic.cc +++ b/gcc/tree-vect-generic.cc @@ -292,7 +292,8 @@ expand_vector_piecewise (gimple_stmt_iterator *gsi, elem_op_func f, tree part_width = TYPE_SIZE (inner_type); tree index = bitsize_int (0); int nunits = nunits_for_known_piecewise_op (type); - int delta = tree_to_uhwi (part_width) / vector_element_bits (type); + int delta = (VECTOR_TYPE_P (inner_type) + ? nunits_for_known_piecewise_op (inner_type) : 1); int i; location_t loc = gimple_location (gsi_stmt (*gsi)); -- 2.47.2