aboutsummaryrefslogtreecommitdiff
path: root/include/fpu
diff options
context:
space:
mode:
authorRichard Henderson <richard.henderson@linaro.org>2020-09-23 08:57:01 -0700
committerRichard Henderson <richard.henderson@linaro.org>2021-05-16 07:13:51 -0500
commitb4d09b1794b08cbed5b33ea4bd146f523a2c3c1f (patch)
tree825ce7f362d77b5c653a3ef4ec3aa2541b54d48c /include/fpu
parentdedd123c56214f897d7045f2133b0261502690c6 (diff)
downloadqemu-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.h23
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);
}
/*----------------------------------------------------------------------------