Index: lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp
===================================================================
--- lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp
+++ lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp
@@ -53,6 +53,9 @@
 
   setAction({G_FMUL, S32}, Legal);
 
+  setAction({G_FPTOUI, S32}, Legal);
+  setAction({G_FPTOUI, 1, S32}, Legal);
+
   setAction({G_GEP, P1}, Legal);
   setAction({G_GEP, P2}, Legal);
   setAction({G_GEP, 1, S64}, Legal);
Index: test/CodeGen/AMDGPU/GlobalISel/legalize-fptoui.mir
===================================================================
--- /dev/null
+++ test/CodeGen/AMDGPU/GlobalISel/legalize-fptoui.mir
@@ -0,0 +1,22 @@
+# RUN: llc -mtriple=amdgcn-mesa-mesa3d -run-pass=legalizer -global-isel %s -o - | FileCheck %s
+
+--- |
+  define void @test_fptoui() { ret void }
+...
+
+---
+name:            test_fptoui
+registers:
+  - { id: 0, class: _ }
+  - { id: 1, class: _ }
+  - { id: 2, class: _ }
+body: |
+  bb.0:
+    liveins: %vgpr0
+    ; CHECK-LABEL: name: test_fptoui
+    ; CHECK: %1:_(s32) = G_FPTOUI %0
+
+    %0(s32) = COPY %vgpr0
+    %1(s32) = G_FPTOUI %0
+    %vgpr0 = COPY %1
+...