softfloat: Use mulu64 for mul64To128

Via host-utils.h, we use a host widening multiply for
64-bit hosts, and a common subroutine for 32-bit hosts.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

diff --git a/include/fpu/softfloat-macros.h b/include/fpu/softfloat-macros.h
index 2e3760a9c13d0e446c474ca72d35bf8f222a97d6..f6dfbe108d6e45b425d2c707fbb886b84d14dd4e 100644 (file)
--- a/include/fpu/softfloat-macros.h
+++ b/include/fpu/softfloat-macros.h
@@ -470,27 +470,10 @@ static inline void sub192(uint64_t a0, uint64_t a1, uint64_t a2,
 | `z0Ptr' and `z1Ptr'.
 *----------------------------------------------------------------------------*/
 
-static inline void mul64To128( uint64_t a, uint64_t b, uint64_t *z0Ptr, uint64_t *z1Ptr )
+static inline void
+mul64To128(uint64_t a, uint64_t b, uint64_t *z0Ptr, uint64_t *z1Ptr)
 {
-    uint32_t aHigh, aLow, bHigh, bLow;
-    uint64_t z0, zMiddleA, zMiddleB, z1;
-
-    aLow = a;
-    aHigh = a>>32;
-    bLow = b;
-    bHigh = b>>32;
-    z1 = ( (uint64_t) aLow ) * bLow;
-    zMiddleA = ( (uint64_t) aLow ) * bHigh;
-    zMiddleB = ( (uint64_t) aHigh ) * bLow;
-    z0 = ( (uint64_t) aHigh ) * bHigh;
-    zMiddleA += zMiddleB;
-    z0 += ( ( (uint64_t) ( zMiddleA < zMiddleB ) )<<32 ) + ( zMiddleA>>32 );
-    zMiddleA <<= 32;
-    z1 += zMiddleA;
-    z0 += ( z1 < zMiddleA );
-    *z1Ptr = z1;
-    *z0Ptr = z0;
-
+    mulu64(z1Ptr, z0Ptr, a, b);
 }
 
 /*----------------------------------------------------------------------------