eecaeb6f10
The change implements intrinsics 'get_fpenv', 'set_fpenv' and 'reset_fpenv'. They are used to read floating-point environment, set it or reset to some default state. They do the same actions as C library functions 'fegetenv' and 'fesetenv'. By default these intrinsics are lowered to calls to these functions. The new intrinsics specify FP environment as a value of integer type, it is convenient of most targets where the FP state is a content of some register. Some targets however use long representations. On X86 the size of FP environment is 256 bits, and even half of this size is not a legal ibteger type. To facilitate legalization in such cases, two sets of DAG nodes is used. Nodes GET_FPENV and SET_FPENV are used when FP environment may be represented by a legal integer type. Nodes GET_FPENV_MEM and SET_FPENV_MEM consider FP environment as a region in memory, much like `fesetenv` and `fegetenv` do. They are used when target has long representation for floationg-point state. Differential Revision: https://reviews.llvm.org/D71742
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