[committed 4/6] arc: Make use reg_renumber safe.

[Claudiu Zissulescu via Gcc-patches]

The REGNO_OK_FOR_BASE_P is using reg_renumber array. However, it is
not always defined. Use it only when it is defined.

gcc/
2020-12-29  Claudiu Zissulescu  <claz...@synopsys.com>

        * config/arc/arc.h (REGNO_OK_FOR_BASE_P): Check if defined
        reg_renumber.

Signed-off-by: Claudiu Zissulescu <claz...@synopsys.com>
---
 gcc/config/arc/arc.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gcc/config/arc/arc.h b/gcc/config/arc/arc.h
index fd6e21adfaa..c3886330f1b 100644
--- a/gcc/config/arc/arc.h
+++ b/gcc/config/arc/arc.h
@@ -588,7 +588,7 @@ extern enum reg_class arc_regno_reg_class[];
    || ((REGNO) == ARG_POINTER_REGNUM)                                  \
    || ((REGNO) == FRAME_POINTER_REGNUM)                                        
\
    || ((REGNO) == PCL_REG)                                             \
-   || ((unsigned) reg_renumber[REGNO] < 29)                            \
+   || (reg_renumber && ((unsigned) reg_renumber[REGNO] < 29))          \
    || ((unsigned) (REGNO) == (unsigned) arc_tp_regno)                  \
    || (fixed_regs[REGNO] == 0 && IN_RANGE (REGNO, 32, 59))             \
    || (fixed_regs[REGNO] == 0 && (REGNO) == R30_REG))
-- 
2.26.2