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[PATCH 38/72] softfloat: Use mulu64 for mul64To128
From: |
Richard Henderson |
Subject: |
[PATCH 38/72] softfloat: Use mulu64 for mul64To128 |
Date: |
Fri, 7 May 2021 18:47:28 -0700 |
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>
---
include/fpu/softfloat-macros.h | 23 +++--------------------
1 file changed, 3 insertions(+), 20 deletions(-)
diff --git a/include/fpu/softfloat-macros.h b/include/fpu/softfloat-macros.h
index 2e3760a9c1..f6dfbe108d 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);
}
/*----------------------------------------------------------------------------
--
2.25.1
- Re: [PATCH 39/72] softfloat: Use add192 in mul128To256, (continued)
- [PATCH 32/72] softfloat: Move round_canonical to softfloat-parts.c.inc, Richard Henderson, 2021/05/07
- [PATCH 35/72] softfloat: Implement float128_add/sub via parts, Richard Henderson, 2021/05/07
- [PATCH 34/72] softfloat: Move addsub_floats to softfloat-parts.c.inc, Richard Henderson, 2021/05/07
- [PATCH 36/72] softfloat: Move mul_floats to softfloat-parts.c.inc, Richard Henderson, 2021/05/07
- [PATCH 38/72] softfloat: Use mulu64 for mul64To128,
Richard Henderson <=
- [PATCH 40/72] softfloat: Tidy mul128By64To192, Richard Henderson, 2021/05/07
- [PATCH 43/72] softfloat: Split float_to_float, Richard Henderson, 2021/05/07
- [PATCH 44/72] softfloat: Convert float-to-float conversions with float128, Richard Henderson, 2021/05/07
- [PATCH 41/72] softfloat: Introduce sh[lr]_double primitives, Richard Henderson, 2021/05/07
- [PATCH 42/72] softfloat: Move div_floats to softfloat-parts.c.inc, Richard Henderson, 2021/05/07