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re PR c/52577 (__builtin_shuffle -Wunused-but-set-* false positives)

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PR c/52577
	* c-parser.c (c_parser_postfix_expression)
	<case RID_BUILTIN_SHUFFLE>: Call mark_exp_read on argument values.

	* gcc.dg/Wunused-var-3.c: New test.

From-SVN: r185355
This commit is contained in:
Jakub Jelinek 2012-03-13 22:19:50 +01:00 committed by Jakub Jelinek
parent 42cd874911
commit 9243c51d5f
4 changed files with 50 additions and 2 deletions
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4
gcc/ChangeLog
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@ -1,5 +1,9 @@
2012-03-13 Jakub Jelinek <jakub@redhat.com>
PR c/52577
* c-parser.c (c_parser_postfix_expression)
<case RID_BUILTIN_SHUFFLE>: Call mark_exp_read on argument values.
* config/i386/smmintrin.h: Avoid /* within a comment.
* config/i386/nmmintrin.h: Likewise.

9
gcc/c-parser.c
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@ -1,7 +1,7 @@
/* Parser for C and Objective-C.
Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008, 2009, 2010, 2011
Free Software Foundation, Inc.
1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008, 2009, 2010, 2011,
2012 Free Software Foundation, Inc.
Parser actions based on the old Bison parser; structure somewhat
influenced by and fragments based on the C++ parser.
@ -6647,6 +6647,8 @@ c_parser_postfix_expression (c_parser *parser)
case RID_BUILTIN_SHUFFLE:
{
VEC(c_expr_t,gc) *cexpr_list;
unsigned int i;
c_expr_t *p;
c_parser_consume_token (parser);
if (!c_parser_get_builtin_args (parser,
@ -6657,6 +6659,9 @@ c_parser_postfix_expression (c_parser *parser)
break;
}
FOR_EACH_VEC_ELT (c_expr_t, cexpr_list, i, p)
mark_exp_read (p->value);
if (VEC_length (c_expr_t, cexpr_list) == 2)
expr.value =
c_build_vec_perm_expr

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2012-03-13 Jakub Jelinek <jakub@redhat.com>
PR c/52577
* gcc.dg/Wunused-var-3.c: New test.
2012-03-13 Martin Jambor <mjambor@suse.cz>
* gcc.dg/misaligned-expand-2.c: New test.

34
gcc/testsuite/gcc.dg/Wunused-var-3.c Normal file
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@ -0,0 +1,34 @@
/* PR c/52577 */
/* { dg-do compile } */
/* { dg-options "-Wunused" } */
typedef int V __attribute__((vector_size (sizeof (int) * 4)));
void
f1 (V *p)
{
V mask = { 1, 2, 3, 0 };
*p = __builtin_shuffle (*p, mask);
}
void
f2 (V *p, V *q)
{
V mask = { 1, 2, 3, 0 };
*p = __builtin_shuffle (*p, *q, mask);
}
void
f3 (V *p, V *mask)
{
V a = { 1, 2, 3, 0 };
*p = __builtin_shuffle (a, *mask);
}
void
f4 (V *p, V *mask)
{
V a = { 1, 2, 3, 0 };
V b = { 2, 3, 4, 1 };
*p = __builtin_shuffle (a, b, *mask);
}