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-rw-r--r--arch/parisc/lib/libgcc/__umulsidi3.c46
1 files changed, 46 insertions, 0 deletions
diff --git a/arch/parisc/lib/libgcc/__umulsidi3.c b/arch/parisc/lib/libgcc/__umulsidi3.c
new file mode 100644
index 00000000000..396f669164d
--- /dev/null
+++ b/arch/parisc/lib/libgcc/__umulsidi3.c
@@ -0,0 +1,46 @@
+#include "libgcc.h"
+
+#define __ll_B ((u32) 1 << (32 / 2))
+#define __ll_lowpart(t) ((u32) (t) & (__ll_B - 1))
+#define __ll_highpart(t) ((u32) (t) >> 16)
+
+#define umul_ppmm(w1, w0, u, v) \
+ do { \
+ u32 __x0, __x1, __x2, __x3; \
+ u16 __ul, __vl, __uh, __vh; \
+ \
+ __ul = __ll_lowpart (u); \
+ __uh = __ll_highpart (u); \
+ __vl = __ll_lowpart (v); \
+ __vh = __ll_highpart (v); \
+ \
+ __x0 = (u32) __ul * __vl; \
+ __x1 = (u32) __ul * __vh; \
+ __x2 = (u32) __uh * __vl; \
+ __x3 = (u32) __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)
+
+union DWunion {
+ struct {
+ s32 high;
+ s32 low;
+ } s;
+ s64 ll;
+};
+
+u64 __umulsidi3(u32 u, u32 v)
+{
+ union DWunion __w;
+
+ umul_ppmm(__w.s.high, __w.s.low, u, v);
+
+ return __w.ll;
+}