[PATCH] D54313: [compiler-rt][builtins][PowerPC] Add floattitf builtin compiler-rt method support for PowerPC

[Amy Kwan via Phabricator via llvm-commits]

amyk created this revision.
amyk added reviewers: nemanjai, echristo, hfinkel.
Herald added subscribers: jsji, mgorny, dberris.

This patch implements the `int128_t floattitf (long double)` method for PowerPC — specifically to convert a long double (IBM double-double data type) to a 128 bit integer.

The algorithm used in this conversion method from long double to int128_t utilizes the `int64_t floatditf (long double)` and `uint64_t floatunditf (long double)` methods, which are already implemented under `lib/builtins/ppc/`.

This method can be invoked by linking against compiler-rt instead of libgcc, via the `-rtlib=compiler-rt` command line option supplied to clang.


https://reviews.llvm.org/D54313

Files:
  compiler-rt/lib/builtins/CMakeLists.txt
  compiler-rt/lib/builtins/ppc/floattitf.c
  compiler-rt/test/builtins/Unit/ppc/floattitf_test.c
  compiler-rt/test/builtins/Unit/ppc/floattitf_test.h

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