Initial skeleton of Subzero.

tests_lit/llvm2ice_tests/simple-arith.ll

+; RUIN: %llvm2ice -verbose inst %s | FileCheck %s
+; RUIN: %llvm2ice --verbose none %s | FileCheck --check-prefix=ERRORS %s
+; RUN: %szdiff --llvm2ice=%llvm2ice %s | FileCheck --check-prefix=DUMP %s
+
+
+define i64 @add_args_i64(i64 %arg1, i64 %arg2) {
+entry:
+  %add = add i64 %arg2, %arg1
+  ret i64 %add
+}
+
+; Checks for verbose instruction output
+
+; CHECK: define i64 @add_args
+; CHECK: %add = add i64 %arg2, %arg1
+; CHECK-NEXT: ret i64 %add
+
+define i32 @add_args_i32(i32 %arg1, i32 %arg2) {
+entry:
+  %add = add i32 %arg2, %arg1
+  ret i32 %add
+}
+
+; Checks for emitted assembly
+
+; CHECK:      .globl add_args_i32
+; CHECK:      mov eax, dword ptr [esp+4]
+; CHECK-NEXT: mov ecx, dword ptr [esp+8]
+; CHECK-NEXT: add ecx, eax
+; CHECK-NEXT: mov eax, ecx
+; CHECK-NEXT: ret
+
+; ERRORS-NOT: ICE translation error
+; DUMP-NOT: SZ