Leonard Chan 118e53fd63 [Intrinsic] Signed Fixed Point Multiplication Intrinsic ...

Add an intrinsic that takes 2 signed integers with the scale of them provided
as the third argument and performs fixed point multiplication on them.

This is a part of implementing fixed point arithmetic in clang where some of
the more complex operations will be implemented as intrinsics.

Differential Revision: https://reviews.llvm.org/D54719

llvm-svn: 348912

2018-12-12 06:29:14 +00:00

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