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Summary: This patch adds two intrinsics, llvm.sshl.sat and llvm.ushl.sat, which perform signed and unsigned saturating left shift, respectively. These are useful for implementing the Embedded-C fixed point support in Clang, originally discussed in http://lists.llvm.org/pipermail/llvm-dev/2018-August/125433.html and http://lists.llvm.org/pipermail/cfe-dev/2018-May/058019.html Reviewers: leonardchan, craig.topper, bjope, jdoerfert Subscribers: hiraditya, jdoerfert, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D83216
