[FPEnv] Add fptosi and fptoui constrained intrinsics.

This implements constrained floating point intrinsics for FP to signed and
unsigned integers.

Quoting from D32319:
The purpose of the constrained intrinsics is to force the optimizer to
respect the restrictions that will be necessary to support things like the
STDC FENV_ACCESS ON pragma without interfering with optimizations when
these restrictions are not needed.

Reviewed by:	Andrew Kaylor, Craig Topper, Hal Finkel, Cameron McInally, Roman Lebedev, Kit Barton
Approved by:	Craig Topper
Differential Revision:	http://reviews.llvm.org/D63782

llvm-svn: 370228

1 files changed, 2 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index fe3996bdb7d..7a9ef2b327e 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -7778,6 +7778,8 @@ SDNode* SelectionDAG::mutateStrictFPToFP(SDNode *Node) {
   case ISD::STRICT_FTRUNC:     NewOpc = ISD::FTRUNC;     break;
   case ISD::STRICT_FP_ROUND:   NewOpc = ISD::FP_ROUND;   break;
   case ISD::STRICT_FP_EXTEND:  NewOpc = ISD::FP_EXTEND;  break;
+  case ISD::STRICT_FP_TO_SINT: NewOpc = ISD::FP_TO_SINT; break;
+  case ISD::STRICT_FP_TO_UINT: NewOpc = ISD::FP_TO_UINT; break;
   }
 
   assert(Node->getNumValues() == 2 && "Unexpected number of results!");