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[C++] PR58950: warn for unused __builtin_shuffle result
- From: Marc Glisse <marc dot glisse at inria dot fr>
- To: gcc-patches at gcc dot gnu dot org
- Cc: jason at redhat dot com
- Date: Fri, 3 Jan 2014 16:09:17 +0100 (CET)
- Subject: [C++] PR58950: warn for unused __builtin_shuffle result
- Authentication-results: sourceware.org; auth=none
Hello,
this is the piece of patch you commented on in the PR.
Bootstrap+testsuite on x86_64-unknown-linux-gnu.
2014-01-03 Marc Glisse <marc.glisse@inria.fr>
PR c++/58950
gcc/cp/
* cvt.c (convert_to_void): Handle VEC_PERM_EXPR and VEC_COND_EXPR.
gcc/testsuite/
* g++.dg/pr58950.C: New file.
--
Marc GlisseIndex: gcc/cp/cvt.c
===================================================================
--- gcc/cp/cvt.c (revision 206313)
+++ gcc/cp/cvt.c (working copy)
@@ -1396,21 +1396,23 @@ convert_to_void (tree expr, impl_conv_vo
code = TREE_CODE (e);
tclass = TREE_CODE_CLASS (code);
if ((tclass == tcc_comparison
|| tclass == tcc_unary
|| (tclass == tcc_binary
&& !(code == MODIFY_EXPR
|| code == INIT_EXPR
|| code == PREDECREMENT_EXPR
|| code == PREINCREMENT_EXPR
|| code == POSTDECREMENT_EXPR
- || code == POSTINCREMENT_EXPR)))
+ || code == POSTINCREMENT_EXPR))
+ || code == VEC_PERM_EXPR
+ || code == VEC_COND_EXPR)
&& (complain & tf_warning))
warning_at (loc, OPT_Wunused_value, "value computed is not used");
}
}
expr = build1 (CONVERT_EXPR, void_type_node, expr);
}
if (! TREE_SIDE_EFFECTS (expr))
expr = void_zero_node;
return expr;
}
Index: gcc/testsuite/g++.dg/pr58950.C
===================================================================
--- gcc/testsuite/g++.dg/pr58950.C (revision 0)
+++ gcc/testsuite/g++.dg/pr58950.C (working copy)
@@ -0,0 +1,8 @@
+/* { dg-do compile } */
+/* { dg-options "-Wall" } */
+
+void f(){
+ int i __attribute__((vector_size(2*sizeof(int)))) = { 2, 3 };
+ __builtin_shuffle (i, i); /* { dg-warning "value computed is not used" } */
+ ++i?1:0; /* { dg-warning "value computed is not used" } */
+}
Property changes on: gcc/testsuite/g++.dg/pr58950.C
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