77 lines
1.9 KiB
Diff
77 lines
1.9 KiB
Diff
2012-03-13 Jakub Jelinek <jakub@redhat.com>
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PR c/52577
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* c-parser.c (c_parser_postfix_expression)
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<case RID_BUILTIN_SHUFFLE>: Call mark_exp_read on argument values.
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* gcc.dg/Wunused-var-3.c: New test.
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--- gcc/c-parser.c (revision 185354)
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+++ gcc/c-parser.c (revision 185355)
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@@ -1,7 +1,7 @@
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/* Parser for C and Objective-C.
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Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
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- 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008, 2009, 2010, 2011
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- Free Software Foundation, Inc.
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+ 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008, 2009, 2010, 2011,
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+ 2012 Free Software Foundation, Inc.
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Parser actions based on the old Bison parser; structure somewhat
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influenced by and fragments based on the C++ parser.
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@@ -6647,6 +6647,8 @@ c_parser_postfix_expression (c_parser *p
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case RID_BUILTIN_SHUFFLE:
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{
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VEC(c_expr_t,gc) *cexpr_list;
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+ unsigned int i;
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+ c_expr_t *p;
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c_parser_consume_token (parser);
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if (!c_parser_get_builtin_args (parser,
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@@ -6657,6 +6659,9 @@ c_parser_postfix_expression (c_parser *p
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break;
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}
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+ FOR_EACH_VEC_ELT (c_expr_t, cexpr_list, i, p)
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+ mark_exp_read (p->value);
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+
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if (VEC_length (c_expr_t, cexpr_list) == 2)
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expr.value =
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c_build_vec_perm_expr
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--- gcc/testsuite/gcc.dg/Wunused-var-3.c (revision 0)
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+++ gcc/testsuite/gcc.dg/Wunused-var-3.c (revision 185355)
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@@ -0,0 +1,34 @@
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+/* PR c/52577 */
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+/* { dg-do compile } */
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+/* { dg-options "-Wunused" } */
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+
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+typedef int V __attribute__((vector_size (sizeof (int) * 4)));
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+
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+void
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+f1 (V *p)
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+{
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+ V mask = { 1, 2, 3, 0 };
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+ *p = __builtin_shuffle (*p, mask);
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+}
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+
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+void
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+f2 (V *p, V *q)
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+{
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+ V mask = { 1, 2, 3, 0 };
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+ *p = __builtin_shuffle (*p, *q, mask);
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+}
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+
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+void
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+f3 (V *p, V *mask)
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+{
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+ V a = { 1, 2, 3, 0 };
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+ *p = __builtin_shuffle (a, *mask);
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+}
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+
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+void
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+f4 (V *p, V *mask)
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+{
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+ V a = { 1, 2, 3, 0 };
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+ V b = { 2, 3, 4, 1 };
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+ *p = __builtin_shuffle (a, b, *mask);
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+}
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