Implements simple returns and call args for Mips.

tests_lit/llvm2ice_tests/int-arg.ll

Index: tests_lit/llvm2ice_tests/int-arg.ll
diff --git a/tests_lit/llvm2ice_tests/int-arg.ll b/tests_lit/llvm2ice_tests/int-arg.ll
index c59f0c8b295a62b1a69cd8f3ca536ecdaf94cb55..a7c41d06044a3d3dbb8344fe1debbbe25e60f02e 100644
--- a/tests_lit/llvm2ice_tests/int-arg.ll
+++ b/tests_lit/llvm2ice_tests/int-arg.ll
@@ -15,6 +15,16 @@
 ; RUN:   | %if --need=target_ARM32 --need=allow_dump \
 ; RUN:   --command FileCheck --check-prefix ARM32 %s
 
+; TODO(RKotler): Stop skipping unimplemented parts (via --skip-unimplemented)
+; once enough infrastructure is in. Also, switch to --filetype=obj
+; when possible.
+; RUN: %if --need=target_MIPS32 --need=allow_dump \
+; RUN:   --command %p2i --filetype=asm --assemble \
+; RUN:   --disassemble --target mips32 -i %s --args -O2 --skip-unimplemented \
+; RUN:   -allow-externally-defined-symbols \
+; RUN:   | %if --need=target_MIPS32 --need=allow_dump \
+; RUN:   --command FileCheck --check-prefix MIPS32 %s
+
 ; For x86-32, integer arguments use the stack.
 ; For ARM32, integer arguments can be r0-r3. i64 arguments occupy two
 ; adjacent 32-bit registers, and require the first to be an even register.
@@ -31,6 +41,9 @@ entry:
 ; CHECK-NEXT: ret
 ; ARM32-LABEL: test_returning32_arg0
 ; ARM32-NEXT: bx lr
+; MIPS32-LABEL: test_returning32_arg0
+; MIPS32: move  v0,a0
+; MIPS32-NEXT: jr       ra
 
 define internal i32 @test_returning32_arg1(i32 %arg0, i32 %arg1, i32 %arg2, i32 %arg3, i32 %arg4, i32 %arg5, i32 %arg6, i32 %arg7) {
 entry:
@@ -42,7 +55,9 @@ entry:
 ; ARM32-LABEL: test_returning32_arg1
 ; ARM32-NEXT: mov r0, r1
 ; ARM32-NEXT: bx lr
-
+; MIPS32-LABEL: test_returning32_arg1
+; MIPS32: move  v0,a1
+; MIPS32-NEXT: jr       ra
 
 define internal i32 @test_returning32_arg2(i32 %arg0, i32 %arg1, i32 %arg2, i32 %arg3, i32 %arg4, i32 %arg5, i32 %arg6, i32 %arg7) {
 entry:
@@ -54,6 +69,9 @@ entry:
 ; ARM32-LABEL: test_returning32_arg2
 ; ARM32-NEXT: mov r0, r2
 ; ARM32-NEXT: bx lr
+; MIPS32-LABEL: test_returning32_arg2
+; MIPS32: move  v0,a2
+; MIPS32-NEXT: jr       ra
 
 
 define internal i32 @test_returning32_arg3(i32 %arg0, i32 %arg1, i32 %arg2, i32 %arg3, i32 %arg4, i32 %arg5, i32 %arg6, i32 %arg7) {
@@ -103,6 +121,10 @@ entry:
 ; CHECK: ret
 ; ARM32-LABEL: test_returning64_arg0
 ; ARM32-NEXT: bx lr
+; MIPS32-LABEL: test_returning64_arg0
+; MIPS32-NEXT: move     v0,a0
+; MIPS32-NEXT: move     v1,a1
+
 
 define internal i64 @test_returning64_arg1(i64 %arg0, i64 %arg1, i64 %arg2, i64 %arg3) {
 entry:
@@ -116,6 +138,9 @@ entry:
 ; ARM32-NEXT: mov r0, r2
 ; ARM32-NEXT: mov r1, r3
 ; ARM32-NEXT: bx lr
+; MIPS32-LABEL: test_returning64_arg1
+; MIPS32-NEXT: move     v0,a2
+; MIPS32-NEXT: move     v1,a3
 
 define internal i64 @test_returning64_arg2(i64 %arg0, i64 %arg1, i64 %arg2, i64 %arg3) {
 entry: