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[Doc] Document "Splat" in the lexicon

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Patch by Wei-Ren Chen (陳韋任)!

Differential Revision: https://reviews.llvm.org/D32964

llvm-svn: 302950
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Sanjay Patel 2017-05-12 21:30:31 +00:00
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docs/Lexicon.rst
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@ -249,6 +249,14 @@ S
Superword-Level Parallelism, same as :ref:`Basic-Block Vectorization
<lexicon-bb-vectorization>`.
**Splat**
Splat refers to a vector of identical scalar elements.
The term is based on the PowerPC Altivec instructions that provided
this functionality in hardware. For example, "vsplth" and the corresponding
software intrinsic "vec_splat()". Examples of other hardware names for this
action include "duplicate" (ARM) and "broadcast" (x86).
**SRoA**
Scalar Replacement of Aggregates