Merge tag 'v2.6.38' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6

[mv-sheeva.git] / arch / microblaze / lib / muldi3.c

diff --git a/arch/microblaze/lib/muldi3.c b/arch/microblaze/lib/muldi3.c
new file mode 100644 (file)
index 0000000..d4860e1
--- /dev/null
+++ b/arch/microblaze/lib/muldi3.c
@@ -0,0 +1,60 @@
+#include <linux/module.h>
+
+#include "libgcc.h"
+
+#define DWtype long long
+#define UWtype unsigned long
+#define UHWtype unsigned short
+
+#define W_TYPE_SIZE 32
+
+#define __ll_B ((UWtype) 1 << (W_TYPE_SIZE / 2))
+#define __ll_lowpart(t) ((UWtype) (t) & (__ll_B - 1))
+#define __ll_highpart(t) ((UWtype) (t) >> (W_TYPE_SIZE / 2))
+
+/* If we still don't have umul_ppmm, define it using plain C.  */
+#if !defined(umul_ppmm)
+#define umul_ppmm(w1, w0, u, v)                                                \
+       do {                                                            \
+               UWtype __x0, __x1, __x2, __x3;                          \
+               UHWtype __ul, __vl, __uh, __vh;                         \
+                                                                       \
+               __ul = __ll_lowpart(u);                                 \
+               __uh = __ll_highpart(u);                                \
+               __vl = __ll_lowpart(v);                                 \
+               __vh = __ll_highpart(v);                                \
+                                                                       \
+               __x0 = (UWtype) __ul * __vl;                            \
+               __x1 = (UWtype) __ul * __vh;                            \
+               __x2 = (UWtype) __uh * __vl;                            \
+               __x3 = (UWtype) __uh * __vh;                            \
+                                                                       \
+               __x1 += __ll_highpart(__x0); /* this can't give carry */\
+               __x1 += __x2; /* but this indeed can */                 \
+               if (__x1 < __x2) /* did we get it? */                   \
+               __x3 += __ll_B; /* yes, add it in the proper pos */     \
+                                                                       \
+               (w1) = __x3 + __ll_highpart(__x1);                      \
+               (w0) = __ll_lowpart(__x1) * __ll_B + __ll_lowpart(__x0);\
+       } while (0)
+#endif
+
+#if !defined(__umulsidi3)
+#define __umulsidi3(u, v) ({                           \
+       DWunion __w;                                    \
+       umul_ppmm(__w.s.high, __w.s.low, u, v);         \
+       __w.ll;                                         \
+       })
+#endif
+
+DWtype __muldi3(DWtype u, DWtype v)
+{
+       const DWunion uu = {.ll = u};
+       const DWunion vv = {.ll = v};
+       DWunion w = {.ll = __umulsidi3(uu.s.low, vv.s.low)};
+
+       w.s.high += ((UWtype) uu.s.low * (UWtype) vv.s.high
+               + (UWtype) uu.s.high * (UWtype) vv.s.low);
+
+       return w.ll;
+}