[AArch64] Tighten direct call pattern for sibcall to repair -fno-plt

2015-08-06  Jiong Wang  <jiong.wang@arm.com>

gcc/
  * config/aarch64/constraints.md (Usf): Add the test of
  aarch64_is_noplt_call_p.

gcc/testsuite/
  * gcc.target/aarch64/noplt_3.c: New testcase.

From-SVN: r226682

gcc/ChangeLog

 2015-08-06  Jiong Wang  <jiong.wang@arm.com>
 
+	* config/aarch64/constraints.md (Usf): Add the test of
+	aarch64_is_noplt_call_p.
+
+2015-08-06  Jiong Wang  <jiong.wang@arm.com>
+
 	* config/aarch64/aarch64-protos.h (aarch64_is_noplt_call_p): New declaration.
 	* config/aarch64/aarch64.c (aarch64_is_noplt_call_p): New function.
 	* config/aarch64/aarch64.md (call_value_symbol): Check noplt scenarios.

gcc/config/aarch64/constraints.md

@@ -101,8 +101,9 @@
        (match_test "(unsigned HOST_WIDE_INT) ival < 64")))
 
 (define_constraint "Usf"
-  "@internal Usf is a symbol reference."
-  (match_code "symbol_ref"))
+  "@internal Usf is a symbol reference under the context where plt stub allowed."
+  (and (match_code "symbol_ref")
+       (match_test "!aarch64_is_noplt_call_p (op)")))
 
 (define_constraint "UsM"
   "@internal

gcc/testsuite/ChangeLog

 2015-08-06  Jiong Wang  <jiong.wang@arm.com>
 
+	* gcc.target/aarch64/noplt_3.c: New testcase.
+
+2015-08-06  Jiong Wang  <jiong.wang@arm.com>
+
 	* gcc.target/aarch64/noplt_1.c: New testcase.
 	* gcc.target/aarch64/noplt_2.c: Likewise.
 

gcc/testsuite/gcc.target/aarch64/noplt_3.c

+/* { dg-do compile } */
+/* { dg-options "-O2 -fpic -fno-plt" } */
+/* { dg-skip-if "-mcmodel=large, no support for -fpic" { aarch64-*-* }  { "-mcmodel=large" } { "" } } */
+
+int dec (int);
+
+int
+cal (int a)
+{
+  return dec (a);
+}
+
+void
+cal_novalue (int a)
+{
+  dec (a);
+}
+
+/* { dg-final { scan-assembler-times "#:got:" 2 { target { aarch64_tiny || aarch64_small } } } } */
+/* { dg-final { scan-assembler-times "#:got_lo12:" 2 { target aarch64_small } } } */