[ARM] GlobalISel: Select add i32, i32

Add the minimal support necessary to select a function that returns the sum of
two i32 values.

This includes some support for argument/return lowering of i32 values through
registers, as well as the handling of copy and add instructions throughout the
GlobalISel pipeline.

Differential Revision: https://reviews.llvm.org/D26677

llvm-svn: 289940

1 files changed, 5 insertions, 0 deletions

diff --git a/llvm/lib/Target/ARM/ARMLegalizerInfo.cpp b/llvm/lib/Target/ARM/ARMLegalizerInfo.cpp
index f0f00f0acbc..65679507aca 100644
--- a/llvm/lib/Target/ARM/ARMLegalizerInfo.cpp
+++ b/llvm/lib/Target/ARM/ARMLegalizerInfo.cpp
@@ -24,5 +24,10 @@ using namespace llvm;
 #endif
 
 ARMLegalizerInfo::ARMLegalizerInfo() {
+  using namespace TargetOpcode;
+  const LLT s32 = LLT::scalar(32);
+
+  setAction({G_ADD, s32}, Legal);
+
   computeTables();
 }