The C++14 decltype(auto) obfuscation was confusing the x86 builtin; it's
a simple matter to undo it during delayed folding, thanks to the
maybe_undo_parenthesized_ref function that Patrick recently introduced.
Tested x86_64-pc-linux-gnu, applying to trunk.
commit d8cfb8653df9583386a9825809dfdfa5e8d99759
Author: Jason Merrill <ja...@redhat.com>
Date: Fri May 20 17:21:51 2016 -0400
PR c++/70584 - error with parenthesized builtin arg
* cp-gimplify.c (cp_fold) [INDIRECT_REF]: Call
maybe_undo_parenthesized_ref.
diff --git a/gcc/cp/cp-gimplify.c b/gcc/cp/cp-gimplify.c
index aaa2db2..57f5d35 100644
--- a/gcc/cp/cp-gimplify.c
+++ b/gcc/cp/cp-gimplify.c
@@ -1996,6 +1996,15 @@ cp_fold (tree x)
break;
+ case INDIRECT_REF:
+ /* We don't need the decltype(auto) obfuscation anymore. */
+ if (REF_PARENTHESIZED_P (x))
+ {
+ tree p = maybe_undo_parenthesized_ref (x);
+ return cp_fold_maybe_rvalue (p, rval_ops);
+ }
+ goto unary;
+
case ADDR_EXPR:
case REALPART_EXPR:
case IMAGPART_EXPR:
@@ -2008,7 +2017,7 @@ cp_fold (tree x)
case BIT_NOT_EXPR:
case TRUTH_NOT_EXPR:
case FIXED_CONVERT_EXPR:
- case INDIRECT_REF:
+ unary:
loc = EXPR_LOCATION (x);
op0 = cp_fold_maybe_rvalue (TREE_OPERAND (x, 0), rval_ops);
diff --git a/gcc/testsuite/g++.dg/other/i386-10.C b/gcc/testsuite/g++.dg/other/i386-10.C
new file mode 100644
index 0000000..96def72
--- /dev/null
+++ b/gcc/testsuite/g++.dg/other/i386-10.C
@@ -0,0 +1,12 @@
+// { dg-do compile { target i?86-*-* x86_64-*-* } }
+// { dg-options -maes }
+
+typedef long long __m128i __attribute__ ((__vector_size__ (16), __may_alias__));
+
+int main()
+{
+ const char index = 1;
+ __m128i r = { };
+
+ r = __builtin_ia32_aeskeygenassist128 (r, (int)(index));
+}