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1 <!--===- docs/Real16MathSupport.md
5    SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 -->
9 # Flang support for REAL(16) math intrinsics
11 To support most `REAL(16)` (i.e. 128-bit float) math intrinsics Flang relies
12 on third-party libraries providing the implementation.
14 `-DFLANG_RUNTIME_F128_MATH_LIB=libquadmath` CMake option can be used
15 to build `FortranFloat128Math` library that has unresolved references
16 to GCC `libquadmath` library. A Flang driver built with this option
20 can find it. The `libquadmath` library installation into Flang project
23 Testing shows that `libquadmath` versions before GCC-9.3.0 have
24 accuracy issues, so it is recommended to distribute the Flang
27 Care must be taken by the distributors of a Flang package built
30 of `libquadmath` to the Flang users' programs may imply some
32 any legal advice on distributing such a Flang compiler.
34 Flang compiler targeting systems with `LDBL_MANT_DIG == 113`
38 for building Flang compilers for such targets.