| Message ID | 20200924012453.659757-2-richard.henderson@linaro.org |
|---|---|
| State | New |
| Headers | show |
| Series | softfloat: Implement float128_muladd | expand |
On 24.09.20 03:24, Richard Henderson wrote: > Via host-utils.h, we use a host widening multiply for > 64-bit hosts, and a common subroutine for 32-bit hosts. > > Signed-off-by: Richard Henderson <richard.henderson@linaro.org> > --- > include/fpu/softfloat-macros.h | 24 ++++-------------------- > 1 file changed, 4 insertions(+), 20 deletions(-) > > diff --git a/include/fpu/softfloat-macros.h b/include/fpu/softfloat-macros.h > index a35ec2893a..57845f8af0 100644 > --- a/include/fpu/softfloat-macros.h > +++ b/include/fpu/softfloat-macros.h > @@ -83,6 +83,7 @@ this code that are retained. > #define FPU_SOFTFLOAT_MACROS_H > > #include "fpu/softfloat-types.h" > +#include "qemu/host-utils.h" > > /*---------------------------------------------------------------------------- > | Shifts `a' right by the number of bits given in `count'. If any nonzero > @@ -515,27 +516,10 @@ static inline void > | `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); > } > > /*---------------------------------------------------------------------------- > Reviewed-by: David Hildenbrand <david@redhat.com>
diff --git a/include/fpu/softfloat-macros.h b/include/fpu/softfloat-macros.h index a35ec2893a..57845f8af0 100644 --- a/include/fpu/softfloat-macros.h +++ b/include/fpu/softfloat-macros.h @@ -83,6 +83,7 @@ this code that are retained. #define FPU_SOFTFLOAT_MACROS_H #include "fpu/softfloat-types.h" +#include "qemu/host-utils.h" /*---------------------------------------------------------------------------- | Shifts `a' right by the number of bits given in `count'. If any nonzero @@ -515,27 +516,10 @@ static inline void | `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); } /*----------------------------------------------------------------------------
Via host-utils.h, we use a host widening multiply for 64-bit hosts, and a common subroutine for 32-bit hosts. Signed-off-by: Richard Henderson <richard.henderson@linaro.org> --- include/fpu/softfloat-macros.h | 24 ++++-------------------- 1 file changed, 4 insertions(+), 20 deletions(-)