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author | Richard Henderson <richard.henderson@linaro.org> | 2020-09-23 08:57:01 -0700 |
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committer | Richard Henderson <richard.henderson@linaro.org> | 2021-05-16 07:13:51 -0500 |
commit | b4d09b1794b08cbed5b33ea4bd146f523a2c3c1f (patch) | |
tree | 825ce7f362d77b5c653a3ef4ec3aa2541b54d48c /include/fpu | |
parent | dedd123c56214f897d7045f2133b0261502690c6 (diff) | |
download | qemu-b4d09b1794b08cbed5b33ea4bd146f523a2c3c1f.zip qemu-b4d09b1794b08cbed5b33ea4bd146f523a2c3c1f.tar.gz qemu-b4d09b1794b08cbed5b33ea4bd146f523a2c3c1f.tar.bz2 |
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>
Diffstat (limited to 'include/fpu')
-rw-r--r-- | include/fpu/softfloat-macros.h | 23 |
1 files changed, 3 insertions, 20 deletions
diff --git a/include/fpu/softfloat-macros.h b/include/fpu/softfloat-macros.h index 2e3760a..f6dfbe1 100644 --- 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); } /*---------------------------------------------------------------------------- |