[PATCH] build: fix potential factor build failure on arm and risc

[Pádraig Brady]

* src/longlong.h: Sync from gmp repo incorporating:
Protect umul_ppmm with do ... while (0)
Replace obsolete ARC asm 'J' constraints with 'Cal'
Provide umul_ppmm for riscv64
---
 src/longlong.h | 21 +++++++++++++++------
 1 file changed, 15 insertions(+), 6 deletions(-)

diff --git a/src/longlong.h b/src/longlong.h
index 29564a7..d3a0136 100644
--- a/src/longlong.h
+++ b/src/longlong.h
@@ -410,17 +410,17 @@ long __MPN(count_leading_zeros) (UDItype);
           : "=r" (sh),                                                 \
             "=&r" (sl)                                                 \
           : "r"  ((USItype) (ah)),                                     \
-            "rIJ" ((USItype) (bh)),                                    \
+            "rICal" ((USItype) (bh)),                                  \
             "%r" ((USItype) (al)),                                     \
-            "rIJ" ((USItype) (bl)))
+            "rICal" ((USItype) (bl)))
 #define sub_ddmmss(sh, sl, ah, al, bh, bl) \
   __asm__ ("sub.f\t%1, %4, %5\n\tsbc\t%0, %2, %3"                      \
           : "=r" (sh),                                                 \
             "=&r" (sl)                                                 \
           : "r" ((USItype) (ah)),                                      \
-            "rIJ" ((USItype) (bh)),                                    \
+            "rICal" ((USItype) (bh)),                                  \
             "r" ((USItype) (al)),                                      \
-            "rIJ" ((USItype) (bl)))
+            "rICal" ((USItype) (bl)))
 #endif
 
 #if defined (__arm__) && (defined (__thumb2__) || !defined (__thumb__)) \
@@ -1570,6 +1570,15 @@ extern UWtype __MPN(udiv_qrnnd) (UWtype *, UWtype, 
UWtype, UWtype);
   } while (0)
 #endif /* RT/ROMP */
 
+#if defined (__riscv64) && W_TYPE_SIZE == 64
+#define umul_ppmm(ph, pl, u, v) \
+  do {                                                                 \
+    UDItype __u = (u), __v = (v);                                      \
+    (pl) = __u * __v;                                                  \
+    __asm__ ("mulhu\t%2, %1, %0" : "=r" (ph) : "%r" (__u), "r" (__v)); \
+  } while (0)
+#endif
+
 #if (defined (__SH2__) || defined (__SH3__) || defined (__SH4__)) && 
W_TYPE_SIZE == 32
 #define umul_ppmm(w1, w0, u, v) \
   __asm__ ("dmulu.l %2,%3\n\tsts macl,%1\n\tsts mach,%0"               \
@@ -1881,11 +1890,11 @@ extern UWtype __MPN(udiv_qrnnd) (UWtype *, UWtype, 
UWtype, UWtype);
 /* FIXME: "sidi" here is highly doubtful, should sometimes be "diti".  */
 #if !defined (umul_ppmm) && defined (__umulsidi3)
 #define umul_ppmm(ph, pl, m0, m1) \
-  {                                                                    \
+  do {                                                                 \
     UDWtype __ll = __umulsidi3 (m0, m1);                               \
     ph = (UWtype) (__ll >> W_TYPE_SIZE);                               \
     pl = (UWtype) __ll;                                                        
\
-  }
+  } while (0)
 #endif
 
 #if !defined (__umulsidi3)
-- 
2.5.5