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4b729fba3d
llvm.cttz.<type> intrinsic has additional i1 argument is_zero_undef, it tells whether zero as the first argument produces a defined result. G_CTTZ is generated from llvm.cttz.<type> (<type> <src>, i1 false) intrinsics, clang generates these intrinsics from __builtin_ctz and __builtin_ctzll. G_CTTZ_ZERO_UNDEF comes from llvm.cttz.<type> (<type> <src>, i1 true). Clang generates such intrinsics as parts of expansion of builtin_ffs and builtin_ffsll. It is also traditionally part of and many algorithms that are now predicated on avoiding zero-value inputs. Add narrow scalar (algorithm uses G_CTTZ_ZERO_UNDEF) for G_CTTZ. Lower G_CTTZ and G_CTTZ_ZERO_UNDEF for MIPS32. Differential Revision: https://reviews.llvm.org/D73215 |
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