Index: lib/Target/Mips/MipsInstructionSelector.cpp
===================================================================
--- lib/Target/Mips/MipsInstructionSelector.cpp
+++ lib/Target/Mips/MipsInstructionSelector.cpp
@@ -265,6 +265,11 @@
              .add(I.getOperand(2));
     break;
   }
+  case G_INTTOPTR:
+  case G_PTRTOINT: {
+    I.setDesc(TII.get(COPY));
+    return selectCopy(I, MRI);
+  }
   case G_FRAME_INDEX: {
     MI = BuildMI(MBB, I, I.getDebugLoc(), TII.get(Mips::ADDiu))
              .add(I.getOperand(0))
Index: lib/Target/Mips/MipsLegalizerInfo.cpp
===================================================================
--- lib/Target/Mips/MipsLegalizerInfo.cpp
+++ lib/Target/Mips/MipsLegalizerInfo.cpp
@@ -89,9 +89,12 @@
       .legalFor({s32})
       .clampScalar(0, s32, s32);
 
-  getActionDefinitionsBuilder(G_GEP)
+  getActionDefinitionsBuilder({G_GEP, G_INTTOPTR})
       .legalFor({{p0, s32}});
 
+  getActionDefinitionsBuilder(G_PTRTOINT)
+      .legalFor({{s32, p0}});
+
   getActionDefinitionsBuilder(G_FRAME_INDEX)
       .legalFor({p0});
 
Index: lib/Target/Mips/MipsRegisterBankInfo.cpp
===================================================================
--- lib/Target/Mips/MipsRegisterBankInfo.cpp
+++ lib/Target/Mips/MipsRegisterBankInfo.cpp
@@ -388,6 +388,8 @@
   case G_ZEXTLOAD:
   case G_SEXTLOAD:
   case G_GEP:
+  case G_INTTOPTR:
+  case G_PTRTOINT:
   case G_AND:
   case G_OR:
   case G_XOR:
Index: test/CodeGen/Mips/GlobalISel/instruction-select/inttoptr_and_ptrtoint.mir
===================================================================
--- /dev/null
+++ test/CodeGen/Mips/GlobalISel/instruction-select/inttoptr_and_ptrtoint.mir
@@ -0,0 +1,51 @@
+# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
+# RUN: llc -O0 -mtriple=mipsel-linux-gnu -run-pass=instruction-select -verify-machineinstrs %s -o - | FileCheck %s -check-prefixes=MIPS32
+--- |
+
+  define void @inttoptr() {entry: ret void}
+  define void @ptrtoint() {entry: ret void}
+
+...
+---
+name:            inttoptr
+alignment:       2
+legalized:       true
+regBankSelected: true
+tracksRegLiveness: true
+body:             |
+  bb.1.entry:
+    liveins: $a0
+
+    ; MIPS32-LABEL: name: inttoptr
+    ; MIPS32: liveins: $a0
+    ; MIPS32: [[COPY:%[0-9]+]]:gpr32 = COPY $a0
+    ; MIPS32: $v0 = COPY [[COPY]]
+    ; MIPS32: RetRA implicit $v0
+    %0:gprb(s32) = COPY $a0
+    %1:gprb(p0) = G_INTTOPTR %0(s32)
+    $v0 = COPY %1(p0)
+    RetRA implicit $v0
+
+...
+---
+name:            ptrtoint
+alignment:       2
+legalized:       true
+regBankSelected: true
+tracksRegLiveness: true
+body:             |
+  bb.1.entry:
+    liveins: $a0
+
+    ; MIPS32-LABEL: name: ptrtoint
+    ; MIPS32: liveins: $a0
+    ; MIPS32: [[COPY:%[0-9]+]]:gpr32 = COPY $a0
+    ; MIPS32: $v0 = COPY [[COPY]]
+    ; MIPS32: RetRA implicit $v0
+    %0:gprb(p0) = COPY $a0
+    %1:gprb(s32) = G_PTRTOINT %0(p0)
+    $v0 = COPY %1(s32)
+    RetRA implicit $v0
+
+...
+
Index: test/CodeGen/Mips/GlobalISel/legalizer/inttoptr_and_ptrtoint.mir
===================================================================
--- /dev/null
+++ test/CodeGen/Mips/GlobalISel/legalizer/inttoptr_and_ptrtoint.mir
@@ -0,0 +1,48 @@
+# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
+# RUN: llc -O0 -mtriple=mipsel-linux-gnu -run-pass=legalizer -verify-machineinstrs %s -o - | FileCheck %s -check-prefixes=MIPS32
+--- |
+
+  define void @inttoptr() {entry: ret void}
+  define void @ptrtoint() {entry: ret void}
+
+...
+---
+name:            inttoptr
+alignment:       2
+tracksRegLiveness: true
+body:             |
+  bb.1.entry:
+    liveins: $a0
+
+    ; MIPS32-LABEL: name: inttoptr
+    ; MIPS32: liveins: $a0
+    ; MIPS32: [[COPY:%[0-9]+]]:_(s32) = COPY $a0
+    ; MIPS32: [[INTTOPTR:%[0-9]+]]:_(p0) = G_INTTOPTR [[COPY]](s32)
+    ; MIPS32: $v0 = COPY [[INTTOPTR]](p0)
+    ; MIPS32: RetRA implicit $v0
+    %0:_(s32) = COPY $a0
+    %1:_(p0) = G_INTTOPTR %0(s32)
+    $v0 = COPY %1(p0)
+    RetRA implicit $v0
+
+...
+---
+name:            ptrtoint
+alignment:       2
+tracksRegLiveness: true
+body:             |
+  bb.1.entry:
+    liveins: $a0
+
+    ; MIPS32-LABEL: name: ptrtoint
+    ; MIPS32: liveins: $a0
+    ; MIPS32: [[COPY:%[0-9]+]]:_(p0) = COPY $a0
+    ; MIPS32: [[PTRTOINT:%[0-9]+]]:_(s32) = G_PTRTOINT [[COPY]](p0)
+    ; MIPS32: $v0 = COPY [[PTRTOINT]](s32)
+    ; MIPS32: RetRA implicit $v0
+    %0:_(p0) = COPY $a0
+    %1:_(s32) = G_PTRTOINT %0(p0)
+    $v0 = COPY %1(s32)
+    RetRA implicit $v0
+
+...
Index: test/CodeGen/Mips/GlobalISel/llvm-ir/inttoptr_and_ptrtoint.ll
===================================================================
--- /dev/null
+++ test/CodeGen/Mips/GlobalISel/llvm-ir/inttoptr_and_ptrtoint.ll
@@ -0,0 +1,24 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc  -O0 -mtriple=mipsel-linux-gnu -global-isel  -verify-machineinstrs %s -o -| FileCheck %s -check-prefixes=MIPS32
+
+define i32* @inttoptr(i32 %a) {
+; MIPS32-LABEL: inttoptr:
+; MIPS32:       # %bb.0: # %entry
+; MIPS32-NEXT:    move $2, $4
+; MIPS32-NEXT:    jr $ra
+; MIPS32-NEXT:    nop
+entry:
+  %0 = inttoptr i32 %a to i32*
+  ret i32* %0
+}
+
+define i32 @ptrtoint(i32* %a) {
+; MIPS32-LABEL: ptrtoint:
+; MIPS32:       # %bb.0: # %entry
+; MIPS32-NEXT:    move $2, $4
+; MIPS32-NEXT:    jr $ra
+; MIPS32-NEXT:    nop
+entry:
+  %0 = ptrtoint i32* %a to i32
+  ret i32 %0
+}
Index: test/CodeGen/Mips/GlobalISel/regbankselect/inttoptr_and_ptrtoint.mir
===================================================================
--- /dev/null
+++ test/CodeGen/Mips/GlobalISel/regbankselect/inttoptr_and_ptrtoint.mir
@@ -0,0 +1,50 @@
+# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
+# RUN: llc -O0 -mtriple=mipsel-linux-gnu -run-pass=regbankselect -verify-machineinstrs %s -o - | FileCheck %s -check-prefixes=MIPS32
+--- |
+
+  define void @inttoptr() {entry: ret void}
+  define void @ptrtoint() {entry: ret void}
+
+...
+---
+name:            inttoptr
+alignment:       2
+legalized:       true
+tracksRegLiveness: true
+body:             |
+  bb.1.entry:
+    liveins: $a0
+
+    ; MIPS32-LABEL: name: inttoptr
+    ; MIPS32: liveins: $a0
+    ; MIPS32: [[COPY:%[0-9]+]]:gprb(s32) = COPY $a0
+    ; MIPS32: [[INTTOPTR:%[0-9]+]]:gprb(p0) = G_INTTOPTR [[COPY]](s32)
+    ; MIPS32: $v0 = COPY [[INTTOPTR]](p0)
+    ; MIPS32: RetRA implicit $v0
+    %0:_(s32) = COPY $a0
+    %1:_(p0) = G_INTTOPTR %0(s32)
+    $v0 = COPY %1(p0)
+    RetRA implicit $v0
+
+...
+---
+name:            ptrtoint
+alignment:       2
+legalized:       true
+tracksRegLiveness: true
+body:             |
+  bb.1.entry:
+    liveins: $a0
+
+    ; MIPS32-LABEL: name: ptrtoint
+    ; MIPS32: liveins: $a0
+    ; MIPS32: [[COPY:%[0-9]+]]:gprb(p0) = COPY $a0
+    ; MIPS32: [[PTRTOINT:%[0-9]+]]:gprb(s32) = G_PTRTOINT [[COPY]](p0)
+    ; MIPS32: $v0 = COPY [[PTRTOINT]](s32)
+    ; MIPS32: RetRA implicit $v0
+    %0:_(p0) = COPY $a0
+    %1:_(s32) = G_PTRTOINT %0(p0)
+    $v0 = COPY %1(s32)
+    RetRA implicit $v0
+
+...