AMDGPU/GlobalISel: Implement select() for 32-bit @llvm.minnun and @llvm.maxnum

Reviewers: arsenm, nhaehnle

Subscribers: kzhuravl, wdng, yaxunl, rovka, kristof.beyls, dstuttard, tpr, llvm-commits, t-tye

Differential Revision: https://reviews.llvm.org/D46172

llvm-svn: 337056
diff --git a/llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.cpp b/llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.cpp
index 7db6edc..219d430 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.cpp
+++ b/llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.cpp
@@ -186,6 +186,8 @@
   switch (IntrinsicID) {
   default:
     break;
+  case Intrinsic::maxnum:
+  case Intrinsic::minnum:
   case Intrinsic::amdgcn_cvt_pkrtz:
     return selectImpl(I, CoverageInfo);