871a3a409a
Remove OpPPC64LoweredMuluhilo as this operation can be done more efficiently with MULHDU and MULLD directly. This has the benefit of not needing to use tuple select operations, and giving the scheduler more freedom to place these operations. The primary reason to avoid using tuples here is to to avoid suboptimal scheduling when carry ops (e.x ADDC/ADDE) are used in the same block as 64->128b multiples. CL 432275 modifies the scheduling priorities which may cause non-flag/non-carry generating tuple ops to interfere with carry opcodes. Thus resulting in excess saving and restoring of the XER register. This allows CL 432275 to adjust the scheduling priorities without having to workaround odd tuple scheduling behavior. Change-Id: Id04ef009ec4b86416e5436f2b44ae1474e73720e Reviewed-on: https://go-review.googlesource.com/c/go/+/434855 Run-TryBot: Paul Murphy <murp@ibm.com> Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com> TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Keith Randall <khr@golang.org> Reviewed-by: Keith Randall <khr@google.com> Reviewed-by: Cherry Mui <cherryyz@google.com> |
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README.md
The Go Programming Language
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