Index: lib/CodeGen/GlobalISel/IRTranslator.cpp
===================================================================
--- lib/CodeGen/GlobalISel/IRTranslator.cpp
+++ lib/CodeGen/GlobalISel/IRTranslator.cpp
@@ -1174,11 +1174,28 @@
   MachineInstrBuilder MIB =
       MIRBuilder.buildIntrinsic(ID, Res, !CI.doesNotAccessMemory());
 
+  unsigned ArgNo = 0;
   for (auto &Arg : CI.arg_operands()) {
     // Some intrinsics take metadata parameters. Reject them.
     if (isa<MetadataAsValue>(Arg))
       return false;
-    MIB.addUse(packRegs(*Arg, MIRBuilder));
+
+    // If this is required to be an immediate, don't materialize it in a
+    // register.
+    if (CI.paramHasAttr(ArgNo, Attribute::ImmArg)) {
+      if (ConstantInt *CI = dyn_cast<ConstantInt>(Arg)) {
+        // imm arguments are more convenient than cimm (and realistically
+        // probably sufficient), so use them.
+        assert(CI->getBitWidth() <= 64 &&
+               "large intrinsic immediates not handled");
+        MIB.addImm(CI->getSExtValue());
+      } else {
+        MIB.addFPImm(cast<ConstantFP>(Arg));
+      }
+    } else {
+      MIB.addUse(packRegs(*Arg, MIRBuilder));
+    }
+    ++ArgNo;
   }
 
   if (IsSplitType)
Index: test/CodeGen/AArch64/GlobalISel/arm64-irtranslator.ll
===================================================================
--- test/CodeGen/AArch64/GlobalISel/arm64-irtranslator.ll
+++ test/CodeGen/AArch64/GlobalISel/arm64-irtranslator.ll
@@ -507,8 +507,7 @@
 ; CHECK-LABEL: name: intrinsics
 ; CHECK: [[CUR:%[0-9]+]]:_(s32) = COPY $w0
 ; CHECK: [[BITS:%[0-9]+]]:_(s32) = COPY $w1
-; CHECK: [[CREG:%[0-9]+]]:_(s32) = G_CONSTANT i32 0
-; CHECK: [[PTR:%[0-9]+]]:_(p0) = G_INTRINSIC intrinsic(@llvm.returnaddress), [[CREG]]
+; CHECK: [[PTR:%[0-9]+]]:_(p0) = G_INTRINSIC intrinsic(@llvm.returnaddress), 0
 ; CHECK: [[PTR_VEC:%[0-9]+]]:_(p0) = G_FRAME_INDEX %stack.0.ptr.vec
 ; CHECK: [[VEC:%[0-9]+]]:_(<8 x s8>) = G_LOAD [[PTR_VEC]]
 ; CHECK: G_INTRINSIC_W_SIDE_EFFECTS intrinsic(@llvm.aarch64.neon.st2), [[VEC]](<8 x s8>), [[VEC]](<8 x s8>), [[PTR]](p0)
Index: test/CodeGen/AMDGPU/GlobalISel/irtranslator-amdgcn-sendmsg.ll
===================================================================
--- /dev/null
+++ test/CodeGen/AMDGPU/GlobalISel/irtranslator-amdgcn-sendmsg.ll
@@ -0,0 +1,15 @@
+; NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
+; RUN: llc -march=amdgcn -O0 -stop-after=irtranslator -global-isel -verify-machineinstrs %s -o - | FileCheck %s
+
+declare void @llvm.amdgcn.s.sendmsg(i32 immarg, i32)
+
+define amdgpu_ps void @test_sendmsg(i32 inreg %m0) {
+  ; CHECK-LABEL: name: test_sendmsg
+  ; CHECK: bb.1 (%ir-block.0):
+  ; CHECK:   liveins: $sgpr0
+  ; CHECK:   [[COPY:%[0-9]+]]:_(s32) = COPY $sgpr0
+  ; CHECK:   G_INTRINSIC_W_SIDE_EFFECTS intrinsic(@llvm.amdgcn.s.sendmsg), 12, [[COPY]](s32)
+  ; CHECK:   S_ENDPGM
+  call void @llvm.amdgcn.s.sendmsg(i32 12, i32 %m0)
+  ret void
+}
Index: test/CodeGen/AMDGPU/GlobalISel/irtranslator-amdgpu_vs.ll
===================================================================
--- test/CodeGen/AMDGPU/GlobalISel/irtranslator-amdgpu_vs.ll
+++ test/CodeGen/AMDGPU/GlobalISel/irtranslator-amdgpu_vs.ll
@@ -1,9 +1,8 @@
 ; RUN: llc -mtriple=amdgcn-mesa-mesa3d -mcpu=fiji -stop-after=irtranslator -global-isel %s -o - | FileCheck %s
 
-
 ; CHECK-LABEL: name: test_f32_inreg
 ; CHECK: [[S0:%[0-9]+]]:_(s32) = COPY $sgpr0
-; CHECK: G_INTRINSIC_W_SIDE_EFFECTS intrinsic(@llvm.amdgcn.exp), %{{[0-9]+}}(s32), %{{[0-9]+}}(s32), [[S0]]
+; CHECK: G_INTRINSIC_W_SIDE_EFFECTS intrinsic(@llvm.amdgcn.exp), 32, 15, [[S0]]
 define amdgpu_vs void @test_f32_inreg(float inreg %arg0) {
   call void @llvm.amdgcn.exp.f32(i32 32, i32 15, float %arg0, float undef, float undef, float undef, i1 false, i1 false) #0
   ret void
@@ -11,7 +10,7 @@
 
 ; CHECK-LABEL: name: test_f32
 ; CHECK: [[V0:%[0-9]+]]:_(s32) = COPY $vgpr0
-; CHECK: G_INTRINSIC_W_SIDE_EFFECTS intrinsic(@llvm.amdgcn.exp), %{{[0-9]+}}(s32), %{{[0-9]+}}(s32), [[V0]]
+; CHECK: G_INTRINSIC_W_SIDE_EFFECTS intrinsic(@llvm.amdgcn.exp), 32, 15, [[V0]]
 define amdgpu_vs void @test_f32(float %arg0) {
   call void @llvm.amdgcn.exp.f32(i32 32, i32 15, float %arg0, float undef, float undef, float undef, i1 false, i1 false) #0
   ret void
@@ -37,7 +36,7 @@
 ; CHECK: [[S0:%[0-9]+]]:_(s32) = COPY $sgpr0
 ; CHECK: [[S23:%[0-9]+]]:_(p4) = COPY $sgpr2_sgpr3
 ; CHECK: G_LOAD [[S23]]
-; CHECK: G_INTRINSIC_W_SIDE_EFFECTS intrinsic(@llvm.amdgcn.exp), %{{[0-9]+}}(s32), %{{[0-9]+}}(s32), [[S0]]
+; CHECK: G_INTRINSIC_W_SIDE_EFFECTS intrinsic(@llvm.amdgcn.exp), 32, 15, [[S0]]
 define amdgpu_vs void @test_sgpr_alignment0(float inreg %arg0, i32 addrspace(4)* inreg %arg1) {
   %tmp0 = load volatile i32, i32 addrspace(4)* %arg1
   call void @llvm.amdgcn.exp.f32(i32 32, i32 15, float %arg0, float undef, float undef, float undef, i1 false, i1 false) #0
@@ -49,7 +48,7 @@
 ; CHECK: [[S1:%[0-9]+]]:_(s32) = COPY $sgpr1
 ; CHECK: [[V0:%[0-9]+]]:_(s32) = COPY $vgpr0
 ; CHECK: [[V1:%[0-9]+]]:_(s32) = COPY $vgpr1
-; CHECK: G_INTRINSIC_W_SIDE_EFFECTS intrinsic(@llvm.amdgcn.exp), %{{[0-9]+}}(s32), %{{[0-9]+}}(s32), [[V0]](s32), [[S0]](s32), [[V1]](s32), [[S1]](s32)
+; CHECK: G_INTRINSIC_W_SIDE_EFFECTS intrinsic(@llvm.amdgcn.exp), 32, 15, [[V0]](s32), [[S0]](s32), [[V1]](s32), [[S1]](s32)
 define amdgpu_vs void @test_order(float inreg %arg0, float inreg %arg1, float %arg2, float %arg3) {
   call void @llvm.amdgcn.exp.f32(i32 32, i32 15, float %arg2, float %arg0, float %arg3, float %arg1, i1 false, i1 false) #0
   ret void