[committed 2/2] libgcc/arc: Update udivmodsi4 and make the lib safe for rf16

[Claudiu Zissulescu via Gcc-patches]

From: Claudiu Zissulescu <claz...@synopsys.com>

The ARC soft udivmodsi4 algorithm and as well as using umodsi3
for reduced register set configurations are wrong.

libgcc/
        * config/arc/lib2funcs.c (udivmodsi4): Update AND mask.
        * config/arc/lib1funcs.S (umodsi3): Don't use it for RF16
        configurations.
---
 libgcc/config/arc/lib1funcs.S | 2 ++
 libgcc/config/arc/lib2funcs.c | 2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/libgcc/config/arc/lib1funcs.S b/libgcc/config/arc/lib1funcs.S
index 14fd1d2f303..b06361257d1 100644
--- a/libgcc/config/arc/lib1funcs.S
+++ b/libgcc/config/arc/lib1funcs.S
@@ -936,6 +936,7 @@ SYM(__divsi3):
 
 #endif /* L_divsi3 */
 
+#ifndef __ARC_RF16__
 #ifdef  L_umodsi3
        .section .text
        .align 4
@@ -950,6 +951,7 @@ SYM(__umodsi3):
        ENDFUNC(__umodsi3)
 
 #endif /* L_umodsi3 */
+#endif /* !__ARC_RF16__ */
 
 #ifdef  L_modsi3
        .section .text
diff --git a/libgcc/config/arc/lib2funcs.c b/libgcc/config/arc/lib2funcs.c
index 70727b55365..8cba45172b2 100644
--- a/libgcc/config/arc/lib2funcs.c
+++ b/libgcc/config/arc/lib2funcs.c
@@ -59,7 +59,7 @@ udivmodsi4 (nint32_t num, nint32_t den, word_t modwanted)
   nint32_t bit = 1;
   nint32_t res = 0;
 
-  while (den < num && bit && !(den & (1LL << 63)))
+  while (den < num && bit && !(den & (1L << 31)))
     {
       den <<= 1;
       bit <<= 1;
-- 
2.30.2