57 lines
1.5 KiB
Diff
57 lines
1.5 KiB
Diff
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2008-08-13 Jakub Jelinek <jakub@redhat.com>
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PR middle-end/37103
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* fold-const.c (fold_widened_comparison): Do not allow
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sign changes that change the result even if shorter type
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is wider than arg1_unw's type.
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* gcc.c-torture/execute/20080813-1.c: New test.
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--- gcc/fold-const.c.jj 2008-08-13 19:46:11.000000000 +0200
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+++ gcc/fold-const.c 2008-08-13 20:18:21.000000000 +0200
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@@ -6733,10 +6733,8 @@ fold_widened_comparison (enum tree_code
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if ((code == EQ_EXPR || code == NE_EXPR
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|| TYPE_UNSIGNED (TREE_TYPE (arg0)) == TYPE_UNSIGNED (shorter_type))
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&& (TREE_TYPE (arg1_unw) == shorter_type
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- || (TYPE_PRECISION (shorter_type)
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- > TYPE_PRECISION (TREE_TYPE (arg1_unw)))
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|| ((TYPE_PRECISION (shorter_type)
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- == TYPE_PRECISION (TREE_TYPE (arg1_unw)))
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+ >= TYPE_PRECISION (TREE_TYPE (arg1_unw)))
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&& (TYPE_UNSIGNED (shorter_type)
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== TYPE_UNSIGNED (TREE_TYPE (arg1_unw))))
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|| (TREE_CODE (arg1_unw) == INTEGER_CST
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--- gcc/testsuite/gcc.c-torture/execute/20080813-1.c.jj 2008-08-13 20:22:56.000000000 +0200
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+++ gcc/testsuite/gcc.c-torture/execute/20080813-1.c 2008-08-13 20:22:10.000000000 +0200
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@@ -0,0 +1,30 @@
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+/* PR middle-end/37103 */
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+
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+extern void abort (void);
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+
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+void
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+foo (unsigned short x)
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+{
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+ signed char y = -1;
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+ if (x == y)
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+ abort ();
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+}
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+
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+void
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+bar (unsigned short x)
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+{
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+ unsigned char y = -1;
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+ if (x == y)
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+ abort ();
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+}
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+
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+int
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+main (void)
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+{
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+ if (sizeof (int) == sizeof (short))
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+ return 0;
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+ foo (-1);
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+ if (sizeof (short) > 1)
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+ bar (-1);
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+ return 0;
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+}
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