arm.c (arm_get_frame_offsets): Don't use r3 to align the stack when it's going to be saved.

	* config/arm/arm.c (arm_get_frame_offsets): Don't use r3 to
	align the stack when it's going to be saved.

	testsuite/
	* gcc.target/arm/interrupt-1.c: New test.
	* gcc.target/arm/interrupt-2.c: New test.

From-SVN: r162078

gcc/ChangeLog

+2010-07-12  Jie Zhang  <jie@codesourcery.com>
+
+	* config/arm/arm.c (arm_get_frame_offsets): Don't use r3 to
+	align the stack when it's going to be saved.
+
 2010-07-12  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
 
 	PR pch/14940

gcc/config/arm/arm.c

@@ -14691,7 +14691,8 @@ arm_get_frame_offsets (void)
 	     generates better code on Thumb-2 by avoiding the need to
 	     use 32-bit push/pop instructions.  */
 	  if (!crtl->tail_call_emit
-	      && arm_size_return_regs () <= 12)
+	      && arm_size_return_regs () <= 12
+	      && (offsets->saved_regs_mask & (1 << 3)) == 0)
 	    {
 	      reg = 3;
 	    }

gcc/testsuite/ChangeLog

+2010-07-12  Jie Zhang  <jie@codesourcery.com>
+
+	* gcc.target/arm/interrupt-1.c: New test.
+	* gcc.target/arm/interrupt-2.c: New test.
+
 2010-07-12  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
 
 	* gcc.dg/pr42427.c: Require c99_runtime.

gcc/testsuite/gcc.target/arm/interrupt-1.c

+/* Verify that prologue and epilogue are correct for functions with
+   __attribute__ ((interrupt)).  */
+/* { dg-do compile } */
+/* { dg-options "-O0" } */
+
+/* This test is not valid when -mthumb.  We just cheat.  */
+#ifndef __thumb__
+extern void bar (int);
+extern void foo (void) __attribute__ ((interrupt("IRQ")));
+
+void foo ()
+{
+  bar (0);
+}
+#else
+void foo ()
+{
+  asm ("stmfd\tsp!, {r0, r1, r2, r3, r4, fp, ip, lr}");
+  asm ("ldmfd\tsp!, {r0, r1, r2, r3, r4, fp, ip, pc}^");
+}
+#endif
+/* { dg-final { scan-assembler "stmfd\tsp!, {r0, r1, r2, r3, r4, fp, ip, lr}" } } */
+/* { dg-final { scan-assembler "ldmfd\tsp!, {r0, r1, r2, r3, r4, fp, ip, pc}\\^" } } */

gcc/testsuite/gcc.target/arm/interrupt-2.c

+/* Verify that prologue and epilogue are correct for functions with
+   __attribute__ ((interrupt)).  */
+/* { dg-do compile } */
+/* { dg-options "-O1" } */
+
+/* This test is not valid when -mthum.  We just cheat.  */
+#ifndef __thumb__
+extern void bar (int);
+extern void test (void) __attribute__((__interrupt__));
+
+int foo;
+void test()
+{
+  funcptrs(foo);
+  foo = 0;
+}
+#else
+void test ()
+{
+  asm ("stmfd\tsp!, {r0, r1, r2, r3, r4, r5, ip, lr}");
+  asm ("ldmfd\tsp!, {r0, r1, r2, r3, r4, r5, ip, pc}^");
+}
+#endif
+
+/* { dg-final { scan-assembler "stmfd\tsp!, {r0, r1, r2, r3, r4, r5, ip, lr}" } } */
+/* { dg-final { scan-assembler "ldmfd\tsp!, {r0, r1, r2, r3, r4, r5, ip, pc}\\^" } } */