[PATCH] D69250: [ARM][AArch64] Implement __cls and __clsl intrinsics from ACLE

[Victor Campos via Phabricator via cfe-commits]

vhscampos created this revision.
Herald added subscribers: llvm-commits, cfe-commits, hiraditya, kristof.beyls.
Herald added projects: clang, LLVM.

Writing support for two ACLE functions:

  unsigned int __cls(uint32_t x)
  unsigned int __clsl(unsigned long x)

CLS stands for "Count number of leading sign bits".

In AArch64, these two intrinsics can be translated into the 'cls'
instruction directly. In AArch32, on the other hand, this functionality
is achieved by implementing it in terms of clz (count number of leading
zeros).


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D69250

Files:
  clang/include/clang/Basic/BuiltinsAArch64.def
  clang/include/clang/Basic/BuiltinsARM.def
  clang/lib/CodeGen/CGBuiltin.cpp
  clang/lib/Headers/arm_acle.h
  clang/test/CodeGen/builtins-arm.c
  clang/test/CodeGen/builtins-arm64.c
  llvm/include/llvm/IR/IntrinsicsAArch64.td
  llvm/include/llvm/IR/IntrinsicsARM.td
  llvm/lib/Target/AArch64/AArch64InstrInfo.td
  llvm/lib/Target/ARM/ARMISelLowering.cpp
  llvm/test/CodeGen/AArch64/cls.ll
  llvm/test/CodeGen/ARM/cls.ll

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