Add ISD::FROUND for libm round()

All libm floating-point rounding functions, except for round(), had their own
ISD nodes. Recent PowerPC cores have an instruction for round(), and so here I'm
adding ISD::FROUND so that round() can be custom lowered as well.

For the most part, this is straightforward. I've added an intrinsic
and a matching ISD node just like those for nearbyint() and friends. The
SelectionDAG pattern I've named frnd (because ISD::FP_ROUND has already claimed
fround).

This will be used by the PowerPC backend in a follow-up commit.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187926 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 5 insertions, 0 deletions

diff --git a/lib/Transforms/Vectorize/LoopVectorize.cpp b/lib/Transforms/Vectorize/LoopVectorize.cpp
index a62fedc43d..e452acdafa 100644
--- a/lib/Transforms/Vectorize/LoopVectorize.cpp
+++ b/lib/Transforms/Vectorize/LoopVectorize.cpp
@@ -1772,6 +1772,7 @@ getIntrinsicIDForCall(CallInst *CI, const TargetLibraryInfo *TLI) {
     case Intrinsic::trunc:
     case Intrinsic::rint:
     case Intrinsic::nearbyint:
+    case Intrinsic::round:
     case Intrinsic::pow:
     case Intrinsic::fma:
     case Intrinsic::fmuladd:
@@ -1850,6 +1851,10 @@ getIntrinsicIDForCall(CallInst *CI, const TargetLibraryInfo *TLI) {
   case LibFunc::nearbyintf:
   case LibFunc::nearbyintl:
     return Intrinsic::nearbyint;
+  case LibFunc::round:
+  case LibFunc::roundf:
+  case LibFunc::roundl:
+    return Intrinsic::round;
   case LibFunc::pow:
   case LibFunc::powf:
   case LibFunc::powl: