[AMDGPU] Add f16 support (VI+)

Differential Revision: https://reviews.llvm.org/D25975

llvm-svn: 286753
diff --git a/llvm/lib/Target/AMDGPU/SIShrinkInstructions.cpp b/llvm/lib/Target/AMDGPU/SIShrinkInstructions.cpp
index 7f9e9cd..9ee2ede 100644
--- a/llvm/lib/Target/AMDGPU/SIShrinkInstructions.cpp
+++ b/llvm/lib/Target/AMDGPU/SIShrinkInstructions.cpp
@@ -91,6 +91,7 @@
       default: return false;
 
       case AMDGPU::V_MAC_F32_e64:
+      case AMDGPU::V_MAC_F16_e64:
         if (!isVGPR(Src2, TRI, MRI) ||
             TII->hasModifiersSet(MI, AMDGPU::OpName::src2_modifiers))
           return false;