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authorAndrew Waterman <waterman@s141.Millennium.Berkeley.EDU>2011-06-19 21:45:58 -0700
committerAndrew Waterman <waterman@s141.Millennium.Berkeley.EDU>2011-06-19 21:45:58 -0700
commit1e163c715550e20e239976a22e00869884713e54 (patch)
treedbcf7b10e35421c72758df098057014fef7ffff7 /softfloat/s_mul64To128.c
parent0edaecc54329048eb91ad6a45338265ef1a4569c (diff)
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fixed build after repo split
Diffstat (limited to 'softfloat/s_mul64To128.c')
-rwxr-xr-xsoftfloat/s_mul64To128.c28
1 files changed, 28 insertions, 0 deletions
diff --git a/softfloat/s_mul64To128.c b/softfloat/s_mul64To128.c
new file mode 100755
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--- /dev/null
+++ b/softfloat/s_mul64To128.c
@@ -0,0 +1,28 @@
+
+#include <stdint.h>
+#include "platform.h"
+#include "primitives.h"
+
+struct uint128 softfloat_mul64To128( uint64_t a, uint64_t b )
+{
+ uint32_t a32, a0, b32, b0;
+ struct uint128 z;
+ uint64_t mid1, mid2, mid;
+
+ a32 = a>>32;
+ a0 = a;
+ b32 = b>>32;
+ b0 = b;
+ z.v0 = (uint64_t) a0 * b0;
+ mid1 = (uint64_t) a32 * b0;
+ mid2 = (uint64_t) a0 * b32;
+ z.v64 = (uint64_t) a32 * b32;
+ mid = mid1 + mid2;
+ z.v64 += ( (uint64_t) ( mid < mid1 ) )<<32 | mid>>32;
+ mid <<= 32;
+ z.v0 += mid;
+ z.v64 += ( z.v0 < mid );
+ return z;
+
+}
+