[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, 17 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/ARM/GlobalISel/arm-isel.ll b/llvm/test/CodeGen/ARM/GlobalISel/arm-isel.ll
new file mode 100644
index 00000000000..0d62c6f7bfa
--- /dev/null
+++ b/llvm/test/CodeGen/ARM/GlobalISel/arm-isel.ll
@@ -0,0 +1,17 @@
+; RUN: llc -mtriple arm-unknown -global-isel %s -o - | FileCheck %s
+
+define void @test_void_return() {
+; CHECK-LABEL: test_void_return:
+; CHECK: bx lr
+entry:
+  ret void
+}
+
+define i32 @test_add(i32 %x, i32 %y) {
+; CHECK-LABEL: test_add:
+; CHECK: add r0, r0, r1
+; CHECK: bx lr
+entry:
+  %sum = add i32 %x, %y
+  ret i32 %sum
+}