Index: llvm/trunk/test/CodeGen/ARM/GlobalISel/arm-instruction-select-combos.mir
===================================================================
--- llvm/trunk/test/CodeGen/ARM/GlobalISel/arm-instruction-select-combos.mir
+++ llvm/trunk/test/CodeGen/ARM/GlobalISel/arm-instruction-select-combos.mir
@@ -1,6 +1,7 @@
 # RUN: llc -O0 -mtriple arm-- -global-isel -run-pass=instruction-select -verify-machineinstrs %s -o - | FileCheck %s
 --- |
   define void @test_mla() #0 { ret void }
+  define void @test_mla_commutative() #0 { ret void }
   define void @test_mla_v5() #1 { ret void }
 
   define void @test_mls() #2 { ret void }
@@ -45,6 +46,40 @@
     ; CHECK: BX_RET 14, _, implicit %r0
 ...
 ---
+name:            test_mla_commutative
+# CHECK-LABEL: name: test_mla_commutative
+legalized:       true
+regBankSelected: true
+selected:        false
+# CHECK: selected: true
+registers:
+  - { id: 0, class: gprb }
+  - { id: 1, class: gprb }
+  - { id: 2, class: gprb }
+  - { id: 3, class: gprb }
+  - { id: 4, class: gprb }
+body:             |
+  bb.0:
+    liveins: %r0, %r1, %r2
+
+    %0(s32) = COPY %r0
+    %1(s32) = COPY %r1
+    %2(s32) = COPY %r2
+    ; CHECK: [[VREGX:%[0-9]+]]:gprnopc = COPY %r0
+    ; CHECK: [[VREGY:%[0-9]+]]:gprnopc = COPY %r1
+    ; CHECK: [[VREGZ:%[0-9]+]]:gprnopc = COPY %r2
+
+    %3(s32) = G_MUL %0, %1
+    %4(s32) = G_ADD %2, %3
+    ; CHECK: [[VREGR:%[0-9]+]]:gprnopc = MLA [[VREGX]], [[VREGY]], [[VREGZ]], 14, _, _
+
+    %r0 = COPY %4(s32)
+    ; CHECK: %r0 = COPY [[VREGR]]
+
+    BX_RET 14, _, implicit %r0
+    ; CHECK: BX_RET 14, _, implicit %r0
+...
+---
 name:            test_mla_v5
 # CHECK-LABEL: name: test_mla_v5
 legalized:       true
Index: llvm/trunk/utils/TableGen/GlobalISelEmitter.cpp
===================================================================
--- llvm/trunk/utils/TableGen/GlobalISelEmitter.cpp
+++ llvm/trunk/utils/TableGen/GlobalISelEmitter.cpp
@@ -2629,6 +2629,9 @@
     return Error::success();
   }
 
+  if (SrcChild->hasAnyPredicate())
+    return failedImport("Src pattern child has unsupported predicate");
+
   // Check for constant immediates.
   if (auto *ChildInt = dyn_cast<IntInit>(SrcChild->getLeafValue())) {
     OM.addPredicate<ConstantIntOperandMatcher>(ChildInt->getValue());