[PATCH] D69730: [compiler-rt][builtins][PowerPC] Add __fixtfti builtin on PowerPC

[Baptiste Saleil via Phabricator via llvm-commits]

bsaleil created this revision.
bsaleil added reviewers: hfinkel, echristo, masoud.ataei, renenkel, nemanjai, lei, amyk, PowerPC.
bsaleil added projects: Sanitizers, LLVM.
Herald added subscribers: llvm-commits, Sanitizers, steven.zhang, shchenz, jsji, kbarton, mgorny, dberris.

This patch implements __fixtfti builtin for PowerPC.
This builtin converts a long double (IBM double-double) to a signed int128.

The conversion relies on the unsigned conversion of the absolute value of the long double.

The patch also includes tests for this builtin using both positive and negative long doubles.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D69730

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

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