Implements simple returns and call args for Mips.

tests_lit/llvm2ice_tests/return_immediates.ll

 ; Simple test that returns various immediates. For fixed-width instruction
 ; sets, some immediates are more complicated than others.
 ; For x86-32, it shouldn't be a problem.
 
 ; RUN: %p2i --filetype=obj --disassemble -i %s --args -O2 \
 ; RUN:      -allow-externally-defined-symbols | FileCheck %s
 
 ; TODO(jvoung): Stop skipping unimplemented parts (via --skip-unimplemented)
 ; once enough infrastructure is in. Also, switch to --filetype=obj
 ; when possible.
 ; RUN: %if --need=target_ARM32 --need=allow_dump \
 ; RUN:   --command %p2i --filetype=asm --assemble \
 ; RUN:   --disassemble --target arm32 -i %s --args -O2 --skip-unimplemented \
 ; 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:   | %if --need=target_MIPS32 --need=allow_dump \
+; RUN:   --command FileCheck --check-prefix MIPS32 %s
+
 ; Test 8-bits of all ones rotated right by various amounts (even vs odd).
 ; ARM has a shifter that allows encoding 8-bits rotated right by even amounts.
 ; The first few "rotate right" test cases are expressed as shift-left.
 
 define internal i32 @ret_8bits_shift_left0() {
   ret i32 255
 }
 ; CHECK-LABEL: ret_8bits_shift_left0
 ; CHECK-NEXT: mov eax,0xff
 ; ARM32-LABEL: ret_8bits_shift_left0
 ; ARM32-NEXT: mov r0, #255
+; MIPS32-LABEL: ret_8bits_shift_left0
+; MIPS32-NEXT: li       v0,255
 
 define internal i32 @ret_8bits_shift_left1() {
   ret i32 510
 }
 ; CHECK-LABEL: ret_8bits_shift_left1
 ; CHECK-NEXT: mov eax,0x1fe
 ; ARM32-LABEL: ret_8bits_shift_left1
 ; ARM32-NEXT: movw r0, #510
+; MIPS32-LABEL: ret_8bits_shift_left1
+; MIPS32-NEXT: li       v0,510
 
 define internal i32 @ret_8bits_shift_left2() {
   ret i32 1020
 }
 ; CHECK-LABEL: ret_8bits_shift_left2
 ; CHECK-NEXT: mov eax,0x3fc
 ; ARM32-LABEL: ret_8bits_shift_left2
 ; ARM32-NEXT: mov r0, #1020
+; MIPS32-LABEL: ret_8bits_shift_left2
+; MIPS32-NEXT: li       v0,1020
 
 define internal i32 @ret_8bits_shift_left4() {
   ret i32 4080
 }
 ; CHECK-LABEL: ret_8bits_shift_left4
 ; CHECK-NEXT: mov eax,0xff0
 ; ARM32-LABEL: ret_8bits_shift_left4
 ; ARM32-NEXT: mov r0, #4080
+; MIPS32-LABEL: ret_8bits_shift_left4
+; MIPS32-NEXT: li       v0,4080
 
 define internal i32 @ret_8bits_shift_left14() {
   ret i32 4177920
 }
 ; CHECK-LABEL: ret_8bits_shift_left14
 ; CHECK-NEXT: mov eax,0x3fc000
 ; ARM32-LABEL: ret_8bits_shift_left14
 ; ARM32-NEXT: mov r0, #4177920
+; MIPS32-LABEL: ret_8bits_shift_left14
+; MIPS32-NEXT: lui      v0,0x3f
+; MIPS32-NEXT: ori      v0,v0,0xc000
 
 define internal i32 @ret_8bits_shift_left15() {
   ret i32 8355840
 }
 ; CHECK-LABEL: ret_8bits_shift_left15
 ; CHECK-NEXT: mov eax,0x7f8000
 ; ARM32-LABEL: ret_8bits_shift_left15
 ; ARM32-NEXT: movw r0, #32768
 ; ARM32-NEXT: movt r0, #127
+; MIPS32-LABEL: ret_8bits_shift_left15
+; MIPS32-NEXT: lui      v0,0x7f
+; MIPS32-NEXT: ori      v0,v0,0x8000
 
 ; Shift 8 bits left by 24 to the i32 limit. This is also ror by 8 bits.
 
 define internal i32 @ret_8bits_shift_left24() {
   ret i32 4278190080
 }
 ; CHECK-LABEL: ret_8bits_shift_left24
 ; CHECK-NEXT: mov eax,0xff000000
 ; ARM32-LABEL: ret_8bits_shift_left24
 ; ARM32-NEXT: mov r0, #-16777216
 ; ARM32-NEXT: bx lr
+; MIPS32-LABEL: ret_8bits_shift_left24
+; MIPS32-NEXT: lui      v0,0xff00
+; MIPS32-NEXT: ori      v0,v0,0x0
 
 ; The next few cases wrap around and actually demonstrate the rotation.
 
 define internal i32 @ret_8bits_ror7() {
   ret i32 4261412865
 }
 ; CHECK-LABEL: ret_8bits_ror7
 ; CHECK-NEXT: mov eax,0xfe000001
 ; ARM32-LABEL: ret_8bits_ror7
 ; ARM32-NEXT: movw r0, #1
 ; ARM32-NEXT: movt r0, #65024
+; MIPS32-LABEL: ret_8bits_ror7
+; MIPS32-NEXT: lui      v0,0xfe00
+; MIPS32-NEXT: ori      v0,v0,0x1
 
 define internal i32 @ret_8bits_ror6() {
   ret i32 4227858435
 }
 ; CHECK-LABEL: ret_8bits_ror6
 ; CHECK-NEXT: mov eax,0xfc000003
 ; ARM32-LABEL: ret_8bits_ror6
 ; ARM32-NEXT: mov r0, #-67108861
 ; ARM32-NEXT: bx lr
+; MIPS32-LABEL: ret_8bits_ror6
+; MIPS32-NEXT: lui      v0,0xfc00
+; MIPS32-NEXT: ori      v0,v0,0x3
 
 define internal i32 @ret_8bits_ror5() {
   ret i32 4160749575
 }
 ; CHECK-LABEL: ret_8bits_ror5
 ; CHECK-NEXT: mov eax,0xf8000007
 ; ARM32-LABEL: ret_8bits_ror5
 ; ARM32-NEXT: movw r0, #7
 ; ARM32-NEXT: movt r0, #63488
+; MIPS32-LABEL: ret_8bits_ror5
+; MIPS32-NEXT: lui      v0,0xf800
+; MIPS32-NEXT: ori      v0,v0,0x7
 
 define internal i32 @ret_8bits_ror4() {
   ret i32 4026531855
 }
 ; CHECK-LABEL: ret_8bits_ror4
 ; CHECK-NEXT: mov eax,0xf000000f
 ; ARM32-LABEL: ret_8bits_ror4
 ; ARM32-NEXT: mov r0, #-268435441
 ; ARM32-NEXT: bx lr
+; MIPS32-LABEL: ret_8bits_ror4
+; MIPS32-NEXT: lui      v0,0xf000
+; MIPS32-NEXT: ori      v0,v0,0xf
 
 define internal i32 @ret_8bits_ror3() {
   ret i32 3758096415
 }
 ; CHECK-LABEL: ret_8bits_ror3
 ; CHECK-NEXT: mov eax,0xe000001f
 ; ARM32-LABEL: ret_8bits_ror3
 ; ARM32-NEXT: movw r0, #31
 ; ARM32-NEXT: movt r0, #57344
+; MIPS32-LABEL: ret_8bits_ror3
+; MIPS32-NEXT: lui      v0,0xe000
+; MIPS32-NEXT: ori      v0,v0,0x1f
+
 
 define internal i32 @ret_8bits_ror2() {
   ret i32 3221225535
 }
 ; CHECK-LABEL: ret_8bits_ror2
 ; CHECK-NEXT: mov eax,0xc000003f
 ; ARM32-LABEL: ret_8bits_ror2
 ; ARM32-NEXT: mov r0, #-1073741761
 ; ARM32-NEXT: bx lr
+; MIPS32-LABEL: ret_8bits_ror2
+; MIPS32-NEXT: lui      v0,0xc000
+; MIPS32-NEXT: ori      v0,v0,0x3f
 
 define internal i32 @ret_8bits_ror1() {
   ret i32 2147483775
 }
 ; CHECK-LABEL: ret_8bits_ror1
 ; CHECK-NEXT: mov eax,0x8000007f
 ; ARM32-LABEL: ret_8bits_ror1
 ; ARM32-NEXT: movw r0, #127
 ; ARM32-NEXT: movt r0, #32768
+; MIPS32-LABEL: ret_8bits_ror1
+; MIPS32-NEXT: lui      v0,0x8000
+; MIPS32-NEXT: ori      v0,v0,0x7f
 
 ; Some architectures can handle 16-bits at a time efficiently,
 ; so also test those.
 
 define internal i32 @ret_16bits_lower() {
   ret i32 65535
 }
 ; CHECK-LABEL: ret_16bits_lower
 ; CHECK-NEXT: mov eax,0xffff
 ; ARM32-LABEL: ret_16bits_lower
 ; ARM32-NEXT: movw r0, #65535
 ; ARM32-NEXT: bx lr
+; MIPS32-LABEL: ret_16bits_lower
+; MIPS32-NEXT: lui      v0,0x0
+; MIPS32-NEXT: ori      v0,v0,0xffff
 
 define internal i32 @ret_17bits_lower() {
   ret i32 131071
 }
 ; CHECK-LABEL: ret_17bits_lower
 ; CHECK-NEXT: mov eax,0x1ffff
 ; ARM32-LABEL: ret_17bits_lower
 ; ARM32-NEXT: movw r0, #65535
 ; ARM32-NEXT: movt r0, #1
+; MIPS32-LABEL: ret_17bits_lower
+; MIPS32-NEXT: lui      v0,0x1
+; MIPS32-NEXT: ori      v0,v0,0xffff
+
 
 define internal i32 @ret_16bits_upper() {
   ret i32 4294901760
 }
 ; CHECK-LABEL: ret_16bits_upper
 ; CHECK-NEXT: mov eax,0xffff0000
 ; ARM32-LABEL: ret_16bits_upper
 ; ARM32-NEXT: movw r0, #0
 ; ARM32-NEXT: movt r0, #65535
+; MIPS32-LABEL: ret_16bits_upper
+; MIPS32-NEXT: lui      v0,0xffff
+; MIPS32-NEXT: ori      v0,v0,0x0
+
 
 ; Some 32-bit immediates can be inverted, and moved in a single instruction.
 
 define internal i32 @ret_8bits_inverted_shift_left0() {
   ret i32 4294967040
 }
 ; CHECK-LABEL: ret_8bits_inverted_shift_left0
 ; CHECK-NEXT: mov eax,0xffffff00
 ; ARM32-LABEL: ret_8bits_inverted_shift_left0
 ; ARM32-NEXT: mvn r0, #255
 ; ARM32-NEXT: bx lr
+; MIPS32-LABEL: ret_8bits_inverted_shift_left0
+; MIPS32-NEXT: li       v0,-256
 
 define internal i32 @ret_8bits_inverted_shift_left24() {
   ret i32 16777215
 }
 ; CHECK-LABEL: ret_8bits_inverted_shift_left24
 ; CHECK-NEXT: mov eax,0xffffff
 ; ARM32-LABEL: ret_8bits_inverted_shift_left24
 ; ARM32-NEXT: mvn r0, #-16777216
 ; ARM32-NEXT: bx lr
+; MIPS32-LABEL: ret_8bits_inverted_shift_left24
+; MIPS32-NEXT: lui      v0,0xff
+; MIPS32-NEXT: ori      v0,v0,0xffff
 
 define internal i32 @ret_8bits_inverted_ror2() {
   ret i32 1073741760
 }
 ; CHECK-LABEL: ret_8bits_inverted_ror2
 ; CHECK-NEXT: mov eax,0x3fffffc0
 ; ARM32-LABEL: ret_8bits_inverted_ror2
 ; ARM32-NEXT: mvn r0, #-1073741761
 ; ARM32-NEXT: bx lr
+; MIPS32-LABEL: ret_8bits_inverted_ror2
+; MIPS32-NEXT: lui      v0,0x3fff
+; MIPS32-NEXT: ori      v0,v0,0xffc0
 
 define internal i32 @ret_8bits_inverted_ror6() {
   ret i32 67108860
 }
 ; CHECK-LABEL: ret_8bits_inverted_ror6
 ; CHECK-NEXT: mov eax,0x3fffffc
 ; ARM32-LABEL: ret_8bits_inverted_ror6
 ; ARM32-NEXT: mvn r0, #-67108861
 ; ARM32-NEXT: bx lr
+; MIPS32-LABEL: ret_8bits_inverted_ror6
+; MIPS32-NEXT: lui      v0,0x3ff
+; MIPS32-NEXT: ori      v0,v0,0xfffc
+
 
 define internal i32 @ret_8bits_inverted_ror7() {
   ret i32 33554430
 }
 ; CHECK-LABEL: ret_8bits_inverted_ror7
 ; CHECK-NEXT: mov eax,0x1fffffe
 ; ARM32-LABEL: ret_8bits_inverted_ror7
 ; ARM32-NEXT: movw r0, #65534
 ; ARM32-NEXT: movt r0, #511
+; MIPS32-LABEL: ret_8bits_inverted_ror7
+; MIPS32-NEXT: lui      v0,0x1ff
+; MIPS32-NEXT: ori      v0,v0,0xfffe
 
 ; 64-bit immediates.
 
 define internal i64 @ret_64bits_shift_left0() {
   ret i64 1095216660735
 }
 ; CHECK-LABEL: ret_64bits_shift_left0
 ; CHECK-NEXT: mov eax,0xff
 ; CHECK-NEXT: mov edx,0xff
 ; ARM32-LABEL: ret_64bits_shift_left0
 ; ARM32-NEXT: movw r0, #255
 ; ARM32-NEXT: movw r1, #255
+; MIPS32-LABEL: ret_64bits_shift_left0
+; MIPS32-NEXT: li       v0,255
+; MIPS32-NEXT: li       v1,255
+
 
 ; A relocatable constant is assumed to require 32-bits along with
 ; relocation directives.
 
 declare void @_start()
 
 define internal i32 @ret_addr() {
   %ptr = ptrtoint void ()* @_start to i32
   ret i32 %ptr
 }
 ; CHECK-LABEL: ret_addr
 ; CHECK-NEXT: mov eax,0x0 {{.*}} R_386_32 _start
 ; ARM32-LABEL: ret_addr
 ; ARM32-NEXT: movw r0, #0 {{.*}} R_ARM_MOVW_ABS_NC _start
 ; ARM32-NEXT: movt r0, #0 {{.*}} R_ARM_MOVT_ABS    _start
+; TODO(RKotler) emitting proper li but in disassembly
+; it shows up only in the relocation records. Should emit
+; without the macro but we still need to add GOT implementation
+; to finish this case
+;