Index: lib/Target/AMDGPU/SIFoldOperands.cpp
===================================================================
--- lib/Target/AMDGPU/SIFoldOperands.cpp
+++ lib/Target/AMDGPU/SIFoldOperands.cpp
@@ -345,6 +345,7 @@
     // Don't fold into target independent nodes.  Target independent opcodes
     // don't have defined register classes.
     if (UseDesc.isVariadic() ||
+        UseOp.isImplicit() ||
         UseDesc.OpInfo[UseOpIdx].RegClass == -1)
       return;
   }
Index: test/CodeGen/AMDGPU/fold-implicit-operand.mir
===================================================================
--- /dev/null
+++ test/CodeGen/AMDGPU/fold-implicit-operand.mir
@@ -0,0 +1,14 @@
+# RUN: llc -march=amdgcn -run-pass si-fold-operands -verify-machineinstrs -o - %s | FileCheck %s
+---
+# Make sure there is no crash when trying to fold an immediate into an
+# implicit use
+
+# CHECK: %0:vgpr_32 = V_MOV_B32_e32 0, implicit $exec
+# CHECK-NEXT: S_ENDPGM implicit %0
+name: fold_imm_implicit_operand
+body:             |
+  bb.0:
+    %0:vgpr_32 = V_MOV_B32_e32 0, implicit $exec
+    S_ENDPGM implicit %0
+
+...