reg_equal_test.c: New test.

gcc/testsuite/ChangeLog:

2015-07-23  Kugan Vivekanandarajah  <kuganv@linaro.org>

	* gcc.target/arm/reg_equal_test.c: New test.

gcc/ChangeLog:

2015-07-23  Kugan Vivekanandarajah  <kuganv@linaro.org>

	* config/arm/arm.c (arm_emit_movpair): Add REG_EQUAL notes to
	instruction.

From-SVN: r226135

gcc/ChangeLog

 2015-07-23  Kugan Vivekanandarajah  <kuganv@linaro.org>
 
+	* config/arm/arm.c (arm_emit_movpair): Add REG_EQUAL notes to
+	instruction.
+
+2015-07-23  Kugan Vivekanandarajah  <kuganv@linaro.org>
+
 	* cse.c (cse_insn): Fix missing check for STRICT_LOW_PART and minor
 	clean up.
 

gcc/config/arm/arm.c

@@ -17871,19 +17871,27 @@ output_mov_long_double_arm_from_arm (rtx *operands)
 void
 arm_emit_movpair (rtx dest, rtx src)
  {
+  rtx insn;
+
   /* If the src is an immediate, simplify it.  */
   if (CONST_INT_P (src))
     {
       HOST_WIDE_INT val = INTVAL (src);
       emit_set_insn (dest, GEN_INT (val & 0x0000ffff));
       if ((val >> 16) & 0x0000ffff)
-        emit_set_insn (gen_rtx_ZERO_EXTRACT (SImode, dest, GEN_INT (16),
-                                             GEN_INT (16)),
-                       GEN_INT ((val >> 16) & 0x0000ffff));
+	{
+	  emit_set_insn (gen_rtx_ZERO_EXTRACT (SImode, dest, GEN_INT (16),
+					       GEN_INT (16)),
+			 GEN_INT ((val >> 16) & 0x0000ffff));
+	  insn = get_last_insn ();
+	  set_unique_reg_note (insn, REG_EQUAL, copy_rtx (src));
+	}
       return;
     }
    emit_set_insn (dest, gen_rtx_HIGH (SImode, src));
    emit_set_insn (dest, gen_rtx_LO_SUM (SImode, dest, src));
+   insn = get_last_insn ();
+   set_unique_reg_note (insn, REG_EQUAL, copy_rtx (src));
  }
 
 /* Output a move between double words.  It must be REG<-MEM

gcc/testsuite/ChangeLog

+2015-07-23  Kugan Vivekanandarajah  <kuganv@linaro.org>
+
+	* gcc.target/arm/reg_equal_test.c: New test.
+
 2015-07-23  Jeff Law  <law@redhat.com>
 
 	PR lto/66752

gcc/testsuite/gcc.target/arm/reg_equal_test.c

+/* { dg-do compile } */
+/* { dg-options "-O1 -fdump-rtl-expand" } */
+
+extern void abort (void);
+unsigned int a = 1;
+
+int
+main (void)
+{
+  unsigned int b, c, d;
+
+  if (sizeof (int) != 4 || (int) 0xc7d24b5e > 0)
+    return 0;
+
+  c = 0xc7d24b5e;
+  d = a | -2;
+  b = (d == 0) ? c : (c % d);
+  if (b != c)
+    abort ();
+
+  return 0;
+}
+
+/* { dg-final { scan-rtl-dump "expr_list:REG_EQUAL \\(const_int -942519458" "expand" } } */