33 lines
1.2 KiB
Diff
33 lines
1.2 KiB
Diff
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diff -uprN a/gcc/testsuite/gcc.dg/pr94574.c b/gcc/testsuite/gcc.dg/pr94574.c
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--- a/gcc/testsuite/gcc.dg/pr94574.c 1970-01-01 00:00:00.000000000 +0000
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+++ b/gcc/testsuite/gcc.dg/pr94574.c 2020-04-15 21:08:48.972000000 +0000
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@@ -0,0 +1,15 @@
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+/* { dg-do compile } */
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+/* { dg-options "-O2" } */
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+
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+typedef unsigned int v4si __attribute__((vector_size(16)));
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+typedef unsigned int v2si __attribute__((vector_size(8)));
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+
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+/* The aliasing is somewhat dubious here, but it must compile. */
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+
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+v2si
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+foo (v4si v)
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+{
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+ v2si res;
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+ *(v4si *) &res = v;
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+ return res;
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+}
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diff -uprN a/gcc/tree-ssa.c b/gcc/tree-ssa.c
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--- a/gcc/tree-ssa.c 2020-03-31 01:51:30.000000000 +0000
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+++ b/gcc/tree-ssa.c 2020-04-15 21:26:09.828000000 +0000
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@@ -1528,7 +1528,9 @@ non_rewritable_lvalue_p (tree lhs)
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&& known_gt (wi::to_poly_offset (TYPE_SIZE_UNIT (TREE_TYPE (decl))),
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mem_ref_offset (lhs))
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&& multiple_of_p (sizetype, TREE_OPERAND (lhs, 1),
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- TYPE_SIZE_UNIT (TREE_TYPE (lhs))))
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+ TYPE_SIZE_UNIT (TREE_TYPE (lhs)))
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+ && known_ge (wi::to_poly_offset (TYPE_SIZE (TREE_TYPE (decl))),
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+ wi::to_poly_offset (TYPE_SIZE (TREE_TYPE (lhs)))))
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return false;
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}
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