[PATCH 3/7] [ARC] Allow r30 to be used by the reg-alloc.

[Claudiu Zissulescu <Claudiu.Zissulescu@synopsys.com>]

gcc/
2016-12-12  Claudiu Zissulescu  <claziss@synopsys.com>

	* config/arc/arc.c (arc_conditional_register_usage): Allow r30 to
	be used by the reg-alloc.
---
 gcc/config/arc/arc.c | 9 ++++++++-
 gcc/config/arc/arc.h | 3 ++-
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/gcc/config/arc/arc.c b/gcc/config/arc/arc.c
index fd4bf2c..ff86f6c 100644
--- a/gcc/config/arc/arc.c
+++ b/gcc/config/arc/arc.c
@@ -1551,7 +1551,14 @@ arc_conditional_register_usage (void)
       /* For ARCv2 the core register set is changed.  */
       strcpy (rname29, "ilink");
       strcpy (rname30, "r30");
-      fixed_regs[30] = call_used_regs[30] = 1;
+      call_used_regs[30] = 1;
+      fixed_regs[30] = 0;
+
+      arc_regno_reg_class[30] = WRITABLE_CORE_REGS;
+      SET_HARD_REG_BIT (reg_class_contents[WRITABLE_CORE_REGS], 30);
+      SET_HARD_REG_BIT (reg_class_contents[CHEAP_CORE_REGS], 30);
+      SET_HARD_REG_BIT (reg_class_contents[GENERAL_REGS], 30);
+      SET_HARD_REG_BIT (reg_class_contents[MPY_WRITABLE_CORE_REGS], 30);
    }
 
   if (TARGET_MUL64_SET)
diff --git a/gcc/config/arc/arc.h b/gcc/config/arc/arc.h
index 0a4c745..fbc1195 100644
--- a/gcc/config/arc/arc.h
+++ b/gcc/config/arc/arc.h
@@ -641,7 +641,8 @@ extern enum reg_class arc_regno_reg_class[];
   ((REGNO) < 29 || ((REGNO) == ARG_POINTER_REGNUM) || ((REGNO) == 63)	\
    || ((unsigned) reg_renumber[REGNO] < 29)				\
    || ((unsigned) (REGNO) == (unsigned) arc_tp_regno)			\
-   || (fixed_regs[REGNO] == 0 && IN_RANGE (REGNO, 32, 59)))
+   || (fixed_regs[REGNO] == 0 && IN_RANGE (REGNO, 32, 59))		\
+   || ((REGNO) == 30 && fixed_regs[REGNO] == 0))
 
 #define REGNO_OK_FOR_INDEX_P(REGNO) REGNO_OK_FOR_BASE_P(REGNO)
 
-- 
1.9.1