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softfloat: Use add192 in mul128To256

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We can perform the operation in 6 total adds instead of 8.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Tested-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2020-10-26 14:33:53 -07:00
parent b4d09b1794
commit cd55a56e5c
1 changed files with 12 additions and 25 deletions
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37
include/fpu/softfloat-macros.h
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@ -511,34 +511,21 @@ static inline void
| the locations pointed to by `z0Ptr', `z1Ptr', `z2Ptr', and `z3Ptr'.
*----------------------------------------------------------------------------*/
static inline void
mul128To256(
uint64_t a0,
uint64_t a1,
uint64_t b0,
uint64_t b1,
uint64_t *z0Ptr,
uint64_t *z1Ptr,
uint64_t *z2Ptr,
uint64_t *z3Ptr
)
static inline void mul128To256(uint64_t a0, uint64_t a1,
uint64_t b0, uint64_t b1,
uint64_t *z0Ptr, uint64_t *z1Ptr,
uint64_t *z2Ptr, uint64_t *z3Ptr)
{
uint64_t z0, z1, z2, z3;
uint64_t more1, more2;
uint64_t z0, z1, z2;
uint64_t m0, m1, m2, n1, n2;
mul64To128( a1, b1, &z2, &z3 );
mul64To128( a1, b0, &z1, &more2 );
add128( z1, more2, 0, z2, &z1, &z2 );
mul64To128( a0, b0, &z0, &more1 );
add128( z0, more1, 0, z1, &z0, &z1 );
mul64To128( a0, b1, &more1, &more2 );
add128( more1, more2, 0, z2, &more1, &z2 );
add128( z0, z1, 0, more1, &z0, &z1 );
*z3Ptr = z3;
*z2Ptr = z2;
*z1Ptr = z1;
*z0Ptr = z0;
mul64To128(a1, b0, &m1, &m2);
mul64To128(a0, b1, &n1, &n2);
mul64To128(a1, b1, &z2, z3Ptr);
mul64To128(a0, b0, &z0, &z1);
add192( 0, m1, m2, 0, n1, n2, &m0, &m1, &m2);
add192(m0, m1, m2, z0, z1, z2, z0Ptr, z1Ptr, z2Ptr);
}
/*----------------------------------------------------------------------------