[ARC] Fix millicode wrong blink restore.

The blink is restored wrongly when using millicode and regular load
instructions.

gcc/
xxxx-xx-xx  Claudiu Zissulescu  <claziss@synopsys.com>

	* config/arc/arc.c (arc_restore_callee_milli) Don't clobber off
	variable.

testsuite/
xxxx-xx-xx  Claudiu Zissulescu  <claziss@synopsys.com>

	* gcc.target/arc/milli-1.c: New test.

From-SVN: r267129

gcc/ChangeLog

 2018-12-14  Claudiu Zissulescu  <claziss@synopsys.com>
 
+	* config/arc/arc.c (arc_restore_callee_milli) Don't clobber off
+	variable.
+
+2018-12-14  Claudiu Zissulescu  <claziss@synopsys.com>
+
 	* config/arc/arc.h (reg_class): Add SIBCALL_REGS.
 
 2018-12-14  Richard Biener  <rguenther@suse.de>

gcc/config/arc/arc.c

@@ -3597,9 +3597,7 @@ arc_restore_callee_milli (unsigned int gmask,
     insn = frame_insn (insn);
 
   /* Add DWARF info.  */
-  for (regno = start_reg, off = 0;
-       regno <= end_reg;
-       regno++, off += UNITS_PER_WORD)
+  for (regno = start_reg; regno <= end_reg; regno++)
     {
       reg = gen_rtx_REG (SImode, regno);
       add_reg_note (insn, REG_CFA_RESTORE, reg);

gcc/testsuite/ChangeLog

+2018-12-14  Claudiu Zissulescu  <claziss@synopsys.com>
+
+	* gcc.target/arc/milli-1.c: New test.
+
 2018-12-13  Michael Ploujnikov  <michael.ploujnikov@oracle.com>
 
 	* gcc.dg/lto/pr88297_0.c: New test.

gcc/testsuite/gcc.target/arc/milli-1.c

+/* { dg-do compile } */
+/* { dg-options "-Os" } */
+
+/* Test if we restore correctly blink when using millicode.  */
+extern void bar (void);
+
+void foo (void)
+{
+  __asm__ volatile ( "" : : : "r13","r14","r15","r16","r17","r18","r20","r21");
+  bar();
+}
+
+void foo2 (void)
+{
+  bar();
+  __asm__ volatile ( "" : : : "r13","r14","r15","r16","r17","r18","r20","r21");
+}
+
+/* { dg-final { scan-assembler-not "st.*r13,\\\[sp" } } */
+/* { dg-final { scan-assembler-not "st.*r14,\\\[sp" } } */
+/* { dg-final { scan-assembler-not "st.*r15,\\\[sp" } } */
+/* { dg-final { scan-assembler "ld.*blink,\\\[sp,32" } } */
+/* { dg-final { scan-assembler "mov_s.*r12,32" } } */