Subzero, MIPS32: Intrinsic call Cttz for i32

tests_lit/assembler/mips32/encoding_intrinsics.ll

 ; Test encoding of MIPS32 instructions used in intrinsic calls
 
 ; REQUIRES: allow_dump
 
 ; Compile using standalone assembler.
 ; RUN: %p2i --filetype=asm -i %s --target=mips32 --args -O2 \
 ; RUN:   --allow-externally-defined-symbols --skip-unimplemented \
 ; RUN:   | FileCheck %s --check-prefix=ASM
 
 ; Show bytes in assembled standalone code.
 ; RUN: %p2i --filetype=asm -i %s --target=mips32 --assemble --disassemble \
 ; RUN:   --args -O2 --allow-externally-defined-symbols --skip-unimplemented \
 ; RUN:   | FileCheck %s --check-prefix=DIS
 
 ; Compile using integrated assembler.
 ; RUN: %p2i --filetype=iasm -i %s --target=mips32 --args -O2 \
 ; RUN:   --allow-externally-defined-symbols --skip-unimplemented \
 ; RUN:   | FileCheck %s --check-prefix=IASM
 
 ; Show bytes in assembled integrated code.
 ; RUN: %p2i --filetype=iasm -i %s --target=mips32 --assemble --disassemble \
 ; RUN:   --args -O2 --allow-externally-defined-symbols --skip-unimplemented \
 ; RUN:   | FileCheck %s --check-prefix=DIS
 
 declare i32 @llvm.ctlz.i32(i32, i1)
+declare i32 @llvm.cttz.i32(i32, i1)
 declare void @llvm.trap()
 
 define internal i32 @encCtlz32(i32 %x) {
 entry:
   %r = call i32 @llvm.ctlz.i32(i32 %x, i1 false)
   ret i32 %r
 }
 
 ; ASM-LABEL: encCtlz32
 ; ASM-NEXT: .LencCtlz32$entry:
@@ skipping 14 matching lines @@
 ; IASM-NEXT:    .byte 0x70
 ; IASM-NEXT:    .byte 0x21
 ; IASM-NEXT:    .byte 0x10
 ; IASM-NEXT:    .byte 0x80
 ; IASM-NEXT:    .byte 0x0
 ; IASM-NEXT:    .byte 0x8
 ; IASM-NEXT:    .byte 0x0
 ; IASM-NEXT:    .byte 0xe0
 ; IASM-NEXT:    .byte 0x3
 
+define internal i32 @encCttz32(i32 %x) {
+entry:
+  %r = call i32 @llvm.cttz.i32(i32 %x, i1 false)
+  ret i32 %r
+}
+
+; ASM-LABEL: encCttz32
+; ASM-NEXT: .LencCttz32$entry:
+; ASM-NEXT:     addiu   $v0, $a0, -1
+; ASM-NEXT:     nor     $a0, $a0, $zero
+; ASM-NEXT:     and     $a0, $a0, $v0
+; ASM-NEXT:     clz     $a0, $a0
+; ASM-NEXT:     addiu   $v0, $zero, 32
+; ASM-NEXT:     subu    $v0, $v0, $a0
+; ASM-NEXT:     jr      $ra
+
+; DIS-LABEL: 00000010 <encCttz32>:
+; DIS-NEXT:   10:       2482ffff        addiu   v0,a0,-1
+; DIS-NEXT:   14:       00802027        nor     a0,a0,zero
+; DIS-NEXT:   18:       00822024        and     a0,a0,v0
+; DIS-NEXT:   1c:       70842020        clz     a0,a0
+; DIS-NEXT:   20:       24020020        li      v0,32
+; DIS-NEXT:   24:       00441023        subu    v0,v0,a0
+; DIS-NEXT:   28:       03e00008        jr      ra
+
+; IASM-LABEL: encCttz32
+; IASM-NEXT: .LencCttz32$entry:
+; IASM-NEXT:    .byte 0xff
+; IASM-NEXT:    .byte 0xff
+; IASM-NEXT:    .byte 0x82
+; IASM-NEXT:    .byte 0x24
+; IASM-NEXT:    .byte 0x27
+; IASM-NEXT:    .byte 0x20
+; IASM-NEXT:    .byte 0x80
+; IASM-NEXT:    .byte 0x0
+; IASM-NEXT:    .byte 0x24
+; IASM-NEXT:    .byte 0x20
+; IASM-NEXT:    .byte 0x82
+; IASM-NEXT:    .byte 0x0
+; IASM-NEXT:    .byte 0x20
+; IASM-NEXT:    .byte 0x20
+; IASM-NEXT:    .byte 0x84
+; IASM-NEXT:    .byte 0x70
+; IASM-NEXT:    .byte 0x20
+; IASM-NEXT:    .byte 0x0
+; IASM-NEXT:    .byte 0x2
+; IASM-NEXT:    .byte 0x24
+; IASM-NEXT:    .byte 0x23
+; IASM-NEXT:    .byte 0x10
+; IASM-NEXT:    .byte 0x44
+; IASM-NEXT:    .byte 0x0
+; IASM-NEXT:    .byte 0x8
+; IASM-NEXT:    .byte 0x0
+; IASM-NEXT:    .byte 0xe0
+; IASM-NEXT:    .byte 0x3
+
 define internal void @encTrap() {
   unreachable
 }
 
 ; ASM-LABEL: encTrap
 ; ASM-NEXT: .LencTrap$__0:
 ; ASM-NEXT:     teq     $zero, $zero, 0
 
-; DIS-LABEL: 00000010 <encTrap>:
-; DIS-NEXT:    10:      00000034        teq     zero,zero
+; DIS-LABEL: 00000030 <encTrap>:
+; DIS-NEXT:    30:      00000034        teq     zero,zero
 
 ; IASM-LABEL: encTrap:
 ; IASM-NEXT: .LencTrap$__0:
 ; IASM-NEXT:    .byte 0x34
 ; IASM-NEXT:    .byte 0x0
 ; IASM-NEXT:    .byte 0x0
 ; IASM-NEXT:    .byte 0x0