48 lines
1.4 KiB
Diff
48 lines
1.4 KiB
Diff
2024-07-22 Jakub Jelinek <jakub@redhat.com>
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Andrew Pinski <quic_apinski@quicinc.com>
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PR tree-optimization/116034
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* tree-sra.c (maybe_rewrite_mem_ref_base): Only use IMAGPART_EXPR
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if MEM_REF offset is equal to element type size.
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* gcc.dg/pr116034.c: New test.
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--- gcc/tree-ssa.c.jj 2024-03-11 11:00:46.768915988 +0100
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+++ gcc/tree-ssa.c 2024-07-22 21:27:02.115530861 +0200
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@@ -1506,7 +1506,10 @@ maybe_rewrite_mem_ref_base (tree *tp, bi
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}
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else if (TREE_CODE (TREE_TYPE (sym)) == COMPLEX_TYPE
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&& useless_type_conversion_p (TREE_TYPE (*tp),
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- TREE_TYPE (TREE_TYPE (sym))))
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+ TREE_TYPE (TREE_TYPE (sym)))
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+ && (integer_zerop (TREE_OPERAND (*tp, 1))
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+ || tree_int_cst_equal (TREE_OPERAND (*tp, 1),
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+ TYPE_SIZE_UNIT (TREE_TYPE (*tp)))))
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{
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*tp = build1 (integer_zerop (TREE_OPERAND (*tp, 1))
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? REALPART_EXPR : IMAGPART_EXPR,
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--- gcc/testsuite/gcc.dg/pr116034.c.jj 2024-07-22 21:39:50.050994243 +0200
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+++ gcc/testsuite/gcc.dg/pr116034.c 2024-07-22 21:39:32.432213042 +0200
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@@ -0,0 +1,21 @@
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+/* PR tree-optimization/116034 */
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+/* { dg-do run } */
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+/* { dg-options "-O1 -fno-strict-aliasing" } */
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+
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+int g;
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+
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+static inline int
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+foo (_Complex unsigned short c)
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+{
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+ __builtin_memmove (&g, 1 + (char *) &c, 2);
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+ return g;
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+}
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+
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+int
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+main ()
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+{
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+ if (__SIZEOF_SHORT__ == 2
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+ && __CHAR_BIT__ == 8
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+ && foo (__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ ? 0x0100 : 1) != 1)
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+ __builtin_abort ();
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+}
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