[PATCH] D71287: [PowerPC] [RFC] exploit fcti[dw] instructions for lrint and llrint

[Colin Samples via Phabricator via llvm-commits]

vddvss created this revision.
vddvss added reviewers: hfinkel, nemanjai, jsji, PowerPC.
vddvss added a project: LLVM.
Herald added subscribers: llvm-commits, shchenz, kbarton, hiraditya.

Not sure if folks are interested in this, but this patch adds support for lowering `lrint` and `llrint` intrinsics to `fcti[dw]` instructions.

This is inspired by `D68841`, which fixed an issue regarding support for `lrint` and `llrint` intrinsics.

This uses the existing fp-to-int infrastructure, and cleans up some of the logic in the logic for that.

AFAICT these instructions match the semantics of the C99/11 standard:

  The lrint and llrint functions round their argument to the nearest integer
  value, rounding according to the current rounding direction. If the rounded
  value is outside the range of the return type, the numeric result is
  unspecified and a domain error or range error may occur.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D71287

Files:
  llvm/lib/Target/PowerPC/PPCISelLowering.cpp
  llvm/lib/Target/PowerPC/PPCISelLowering.h
  llvm/lib/Target/PowerPC/PPCInstr64Bit.td
  llvm/lib/Target/PowerPC/PPCInstrInfo.td
  llvm/test/CodeGen/PowerPC/llrint-conv.ll
  llvm/test/CodeGen/PowerPC/lrint-conv.ll
  llvm/test/CodeGen/PowerPC/pr43527.ll

-------------- next part --------------
A non-text attachment was scrubbed...
Name: D71287.233139.patch
Type: text/x-patch
Size: 15280 bytes
Desc: not available
URL: <http://lists.llvm.org/pipermail/llvm-commits/attachments/20191210/c7e3b111/attachment.bin>