[ARM] GlobalISel: Allow i8 and i16 adds

Teach the instruction selector and legalizer that it's ok to have adds with 8 or
16-bit integers.

This is the second part of https://reviews.llvm.org/D27704

llvm-svn: 290105

1 files changed, 6 insertions, 1 deletions

diff --git a/llvm/lib/Target/ARM/ARMLegalizerInfo.cpp b/llvm/lib/Target/ARM/ARMLegalizerInfo.cpp
index 6680196..255ea4b 100644
--- a/llvm/lib/Target/ARM/ARMLegalizerInfo.cpp
+++ b/llvm/lib/Target/ARM/ARMLegalizerInfo.cpp
@@ -25,7 +25,11 @@ using namespace llvm;
 
 ARMLegalizerInfo::ARMLegalizerInfo() {
   using namespace TargetOpcode;
+
   const LLT p0 = LLT::pointer(0, 32);
+
+  const LLT s8 = LLT::scalar(8);
+  const LLT s16 = LLT::scalar(16);
   const LLT s32 = LLT::scalar(32);
 
   setAction({G_FRAME_INDEX, p0}, Legal);
@@ -33,7 +37,8 @@ ARMLegalizerInfo::ARMLegalizerInfo() {
   setAction({G_LOAD, s32}, Legal);
   setAction({G_LOAD, 1, p0}, Legal);
 
-  setAction({G_ADD, s32}, Legal);
+  for (auto Ty : {s8, s16, s32})
+    setAction({G_ADD, Ty}, Legal);
 
   computeTables();
 }