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[AMDGPU] Implement 'llvm.get.fpenv' and 'llvm.set.fpenv' (#83906)
Summary: This patch implements the LLVM floating point environment control intrinsics and also exposes it through clang. We encode the floating point environment as a 64-bit value that simply concatenates the values of the mode registers and the current trap status. We only fetch the bits relevant for floating point instructions. That is, rounding mode, denormalization mode, ieee, dx10 clamp, debug, enabled traps, f16 overflow, and active exceptions.
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