[PATCH] D27898: [compiler-rt] [builtins] Implement __floattitf() & __floatuntitf()

[Michał Górny via Phabricator via cfe-commits]

mgorny created this revision.
mgorny added reviewers: sdmitrouk, rengolin, zatrazz.
mgorny added a subscriber: cfe-commits.
Herald added subscribers: dberris, aemerson.

Implement the missing __floattitf() and __floatuntitf() functions, to
convert 128-bit (unsigned) integers to quad-precision floating-point
types. This is needed e.g. on AArch64 where 'long double' is
a quad-precision type.

The code is based on the existing code for __floattixf()
and __floatuntixf(), updated to account for different bit field lengths
of quad-precision float. The tests are also copied, with the rounding
tests adjusted for longer mantissa.

(tested on AArch64)


https://reviews.llvm.org/D27898

Files:
  lib/builtins/CMakeLists.txt
  lib/builtins/floattitf.c
  lib/builtins/floatuntitf.c
  test/builtins/Unit/floattitf_test.c
  test/builtins/Unit/floatuntitf_test.c

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