[SubZero] Implement load and store for MIPS

tests_lit/llvm2ice_tests/load.ll

Index: tests_lit/llvm2ice_tests/load.ll
diff --git a/tests_lit/llvm2ice_tests/load.ll b/tests_lit/llvm2ice_tests/load.ll
index 33520ab3679adc1f3fefc6887e99768c488d60c4..21d2c87a4ba749dce1867a8f23f5200514038010 100644
--- a/tests_lit/llvm2ice_tests/load.ll
+++ b/tests_lit/llvm2ice_tests/load.ll
@@ -4,6 +4,13 @@
 
 ; RUN: %p2i -i %s --args --verbose inst -threads=0 | FileCheck %s
 
+; RUN: %if --need=target_MIPS32 --need=allow_dump \
+; RUN:   --command %p2i --filetype=asm --assemble \
+; RUN:   --disassemble --target mips32 -i %s --args -Om1 --skip-unimplemented \
+; RUN:   -allow-externally-defined-symbols \
+; RUN:   | %if --need=target_MIPS32 --need=allow_dump \
+; RUN:   --command FileCheck --check-prefix MIPS32 %s
+
 define internal void @load_i64(i32 %addr_arg) {
 entry:
   %__1 = inttoptr i32 %addr_arg to i64*
@@ -16,6 +23,10 @@ entry:
 ; CHECK-NEXT:  ret void
 }
 
+; MIPS32-LABEL: load_i64
+; MIPS32: lw {{.*}},0({{.*}})
+; MIPS32-NEXT: lw {{.*}},4({{.*}})
+
 define internal void @load_i32(i32 %addr_arg) {
 entry:
   %__1 = inttoptr i32 %addr_arg to i32*
@@ -28,6 +39,9 @@ entry:
 ; CHECK-NEXT:  ret void
 }
 
+; MIPS32-LABEL: load_i32
+; MIPS32: lw {{.*}},0({{.*}})
+
 define internal void @load_i16(i32 %addr_arg) {
 entry:
   %__1 = inttoptr i32 %addr_arg to i16*
@@ -40,6 +54,9 @@ entry:
 ; CHECK-NEXT:  ret void
 }
 
+; MIPS32-LABEL: load_i16
+; MIPS32: lh {{.*}},0({{.*}})
+
 define internal void @load_i8(i32 %addr_arg) {
 entry:
   %__1 = inttoptr i32 %addr_arg to i8*
@@ -51,3 +68,6 @@ entry:
 ; CHECK-NEXT:  %iv = load i8, i8* %addr_arg, align 1
 ; CHECK-NEXT:  ret void
 }
+
+; MIPS32-LABEL: load_i8
+; MIPS32: lb {{.*}},0({{.*}})