[PATCH] Allow indirect call via GOT for 64-bit Pmode x32

From: H.J. Lu  <hongjiu.lu@intel.com>

Since Pmode is 64-bit with -maddress-mode=long for x32, indirect call
via GOT slot doesn't need zero_extend.  This patch enables indirect call
via GOT for x32 with 64-bit Pmode.

gcc/

	PR target/66232
	* config/i386/constraints.md (Bs): Allow GOT slot for x32 with
	64-bit Pmode.
	(Bw): Likewise.
	(Bz): Likewise.
	* config/i386/predicates.md (call_insn_operand): Likewise.
	(sibcall_insn_operand): Likewise.

gcc/testsuite/

	PR target/66232
	* gcc.target/i386/pr66232-10.c: New test.
	* gcc.target/i386/pr66232-11.c: Likewise.
	* gcc.target/i386/pr66232-12.c: Likewise.
	* gcc.target/i386/pr66232-13.c: Likewise.

From-SVN: r231923

8 files changed, 97 insertions, 18 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 032e2da..05c6460 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,13 @@
+2015-12-23  H.J. Lu  <hongjiu.lu@intel.com>
+
+	PR target/66232
+	* config/i386/constraints.md (Bs): Allow GOT slot for x32 with
+	64-bit Pmode.
+	(Bw): Likewise.
+	(Bz): Likewise.
+	* config/i386/predicates.md (call_insn_operand): Likewise.
+	(sibcall_insn_operand): Likewise.
+
 2015-12-22  David Malcolm  <dmalcolm@redhat.com>
 
 	PR c/68473
diff --git a/gcc/config/i386/constraints.md b/gcc/config/i386/constraints.md
index 2861d8d..b46d32b 100644
--- a/gcc/config/i386/constraints.md
+++ b/gcc/config/i386/constraints.md
@@ -162,13 +162,17 @@
 
 (define_constraint "Bs"
   "@internal Sibcall memory operand."
-  (and (not (match_test "TARGET_X32"))
-       (match_operand 0 "sibcall_memory_operand")))
+  (ior (and (not (match_test "TARGET_X32"))
+	    (match_operand 0 "sibcall_memory_operand"))
+       (and (match_test "TARGET_X32 && Pmode == DImode")
+	    (match_operand 0 "GOT_memory_operand"))))
 
 (define_constraint "Bw"
   "@internal Call memory operand."
-  (and (not (match_test "TARGET_X32"))
-       (match_operand 0 "memory_operand")))
+  (ior (and (not (match_test "TARGET_X32"))
+	    (match_operand 0 "memory_operand"))
+       (and (match_test "TARGET_X32 && Pmode == DImode")
+	    (match_operand 0 "GOT_memory_operand"))))
 
 (define_constraint "Bz"
   "@internal Constant call address operand."
diff --git a/gcc/config/i386/predicates.md b/gcc/config/i386/predicates.md
index 96d946c..17249e7 100644
--- a/gcc/config/i386/predicates.md
+++ b/gcc/config/i386/predicates.md
@@ -620,32 +620,36 @@
   return false;
 })
 
+;; Return true if OP is a GOT memory operand.
+(define_predicate "GOT_memory_operand"
+  (match_operand 0 "memory_operand")
+{
+  op = XEXP (op, 0);
+  return (GET_CODE (op) == CONST
+	  && GET_CODE (XEXP (op, 0)) == UNSPEC
+	  && XINT (XEXP (op, 0), 1) == UNSPEC_GOTPCREL);
+})
+
 ;; Test for a valid operand for a call instruction.
 ;; Allow constant call address operands in Pmode only.
 (define_special_predicate "call_insn_operand"
   (ior (match_test "constant_call_address_operand
 		     (op, mode == VOIDmode ? mode : Pmode)")
        (match_operand 0 "call_register_no_elim_operand")
-       (and (not (match_test "TARGET_X32"))
-	    (match_operand 0 "memory_operand"))))
+       (ior (and (not (match_test "TARGET_X32"))
+		 (match_operand 0 "sibcall_memory_operand"))
+	    (and (match_test "TARGET_X32 && Pmode == DImode")
+		 (match_operand 0 "GOT_memory_operand")))))
 
 ;; Similarly, but for tail calls, in which we cannot allow memory references.
 (define_special_predicate "sibcall_insn_operand"
   (ior (match_test "constant_call_address_operand
 		     (op, mode == VOIDmode ? mode : Pmode)")
        (match_operand 0 "register_no_elim_operand")
-       (and (not (match_test "TARGET_X32"))
-	    (match_operand 0 "sibcall_memory_operand"))))
-
-;; Return true if OP is a GOT memory operand.
-(define_predicate "GOT_memory_operand"
-  (match_operand 0 "memory_operand")
-{
-  op = XEXP (op, 0);
-  return (GET_CODE (op) == CONST
-	  && GET_CODE (XEXP (op, 0)) == UNSPEC
-	  && XINT (XEXP (op, 0), 1) == UNSPEC_GOTPCREL);
-})
+       (ior (and (not (match_test "TARGET_X32"))
+		 (match_operand 0 "sibcall_memory_operand"))
+	    (and (match_test "TARGET_X32 && Pmode == DImode")
+		 (match_operand 0 "GOT_memory_operand")))))
 
 ;; Return true if OP is a 32-bit GOT symbol operand.
 (define_predicate "GOT32_symbol_operand"
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 1ee6af0..524b9b0 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,11 @@
+2015-12-23  H.J. Lu  <hongjiu.lu@intel.com>
+
+	PR target/66232
+	* gcc.target/i386/pr66232-10.c: New test.
+	* gcc.target/i386/pr66232-11.c: Likewise.
+	* gcc.target/i386/pr66232-12.c: Likewise.
+	* gcc.target/i386/pr66232-13.c: Likewise.
+
 2015-12-22  David Malcolm  <dmalcolm@redhat.com>
 
 	PR c/68473
diff --git a/gcc/testsuite/gcc.target/i386/pr66232-10.c b/gcc/testsuite/gcc.target/i386/pr66232-10.c
new file mode 100644
index 0000000..c4e9157
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr66232-10.c
@@ -0,0 +1,13 @@
+/* { dg-do compile { target *-*-linux* } } */
+/* { dg-require-effective-target maybe_x32 } */
+/* { dg-options "-O2 -mx32 -fpic -fno-plt -maddress-mode=long" } */
+
+extern void bar (void);
+
+void
+foo (void)
+{
+  bar ();
+}
+
+/* { dg-final { scan-assembler "jmp\[ \t\]*.bar@GOTPCREL" } } */
diff --git a/gcc/testsuite/gcc.target/i386/pr66232-11.c b/gcc/testsuite/gcc.target/i386/pr66232-11.c
new file mode 100644
index 0000000..05794af
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr66232-11.c
@@ -0,0 +1,14 @@
+/* { dg-do compile { target *-*-linux* } } */
+/* { dg-require-effective-target maybe_x32 } */
+/* { dg-options "-O2 -mx32 -fpic -fno-plt -maddress-mode=long" } */
+
+extern void bar (void);
+
+int
+foo (void)
+{
+  bar ();
+  return 0;
+}
+
+/* { dg-final { scan-assembler "call\[ \t\]*.bar@GOTPCREL" } } */
diff --git a/gcc/testsuite/gcc.target/i386/pr66232-12.c b/gcc/testsuite/gcc.target/i386/pr66232-12.c
new file mode 100644
index 0000000..313b9e4
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr66232-12.c
@@ -0,0 +1,13 @@
+/* { dg-do compile { target *-*-linux* } } */
+/* { dg-require-effective-target maybe_x32 } */
+/* { dg-options "-O2 -mx32 -fpic -fno-plt -maddress-mode=long" } */
+
+extern int bar (void);
+
+int
+foo (void)
+{
+  return bar ();
+}
+
+/* { dg-final { scan-assembler "jmp\[ \t\]*.bar@GOTPCREL" } } */
diff --git a/gcc/testsuite/gcc.target/i386/pr66232-13.c b/gcc/testsuite/gcc.target/i386/pr66232-13.c
new file mode 100644
index 0000000..50a12cf
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr66232-13.c
@@ -0,0 +1,13 @@
+/* { dg-do compile { target *-*-linux* } } */
+/* { dg-require-effective-target maybe_x32 } */
+/* { dg-options "-O2 -mx32 -fpic -fno-plt -maddress-mode=long" } */
+
+extern int bar (void);
+
+int
+foo (void)
+{
+  return bar () + 1;
+}
+
+/* { dg-final { scan-assembler "call\[ \t\]*.bar@GOTPCREL" } } */