Index: lib/CodeGen/GlobalISel/LegalizerHelper.cpp
===================================================================
--- lib/CodeGen/GlobalISel/LegalizerHelper.cpp
+++ lib/CodeGen/GlobalISel/LegalizerHelper.cpp
@@ -790,11 +790,37 @@
   if (!DstTy.isScalar())
     return UnableToLegalize;
 
+  Register Src1 = MI.getOperand(1).getReg();
+  LLT SrcTy = MRI.getType(Src1);
+  int NumMerge = DstTy.getSizeInBits() / WideTy.getSizeInBits();
+
+  // Try to turn this into a merge of merges if we can use the requested the
+  // requested type as the source.
+
+  // TODO: Pad with undef if DstTy > WideTy
+  if (NumMerge > 1 && WideTy.getSizeInBits() % SrcTy.getSizeInBits() == 0) {
+    int PartsPerMerge = WideTy.getSizeInBits() / SrcTy.getSizeInBits();
+    SmallVector<Register, 4> Parts;
+    SmallVector<Register, 4> SubMerges;
+
+    for (int I = 0; I != NumMerge; ++I) {
+      for (int J = 0; J != PartsPerMerge; ++J)
+        Parts.push_back(MI.getOperand(I * PartsPerMerge + J + 1).getReg());
+
+      auto SubMerge = MIRBuilder.buildMerge(WideTy, Parts);
+      SubMerges.push_back(SubMerge.getReg(0));
+      Parts.clear();
+    }
+
+    MIRBuilder.buildMerge(DstReg, SubMerges);
+    MI.eraseFromParent();
+    return Legalized;
+  }
+
   unsigned NumOps = MI.getNumOperands();
   unsigned NumSrc = MI.getNumOperands() - 1;
   unsigned PartSize = DstTy.getSizeInBits() / NumSrc;
 
-  Register Src1 = MI.getOperand(1).getReg();
   Register ResultReg = MIRBuilder.buildZExt(DstTy, Src1)->getOperand(0).getReg();
 
   for (unsigned I = 2; I != NumOps; ++I) {
Index: test/CodeGen/AMDGPU/GlobalISel/legalize-merge-values.mir
===================================================================
--- test/CodeGen/AMDGPU/GlobalISel/legalize-merge-values.mir
+++ test/CodeGen/AMDGPU/GlobalISel/legalize-merge-values.mir
@@ -77,25 +77,32 @@
     ; CHECK: [[C1:%[0-9]+]]:_(s32) = G_CONSTANT i32 1
     ; CHECK: [[C2:%[0-9]+]]:_(s32) = G_CONSTANT i32 2
     ; CHECK: [[C3:%[0-9]+]]:_(s32) = G_CONSTANT i32 3
-    ; CHECK: [[C4:%[0-9]+]]:_(s32) = G_CONSTANT i32 255
-    ; CHECK: [[COPY:%[0-9]+]]:_(s32) = COPY [[C]](s32)
-    ; CHECK: [[AND:%[0-9]+]]:_(s32) = G_AND [[COPY]], [[C4]]
+    ; CHECK: [[C4:%[0-9]+]]:_(s32) = G_CONSTANT i32 8
+    ; CHECK: [[C5:%[0-9]+]]:_(s32) = G_CONSTANT i32 65535
+    ; CHECK: [[COPY:%[0-9]+]]:_(s32) = COPY [[C4]](s32)
+    ; CHECK: [[AND:%[0-9]+]]:_(s32) = G_AND [[COPY]], [[C5]]
+    ; CHECK: [[C6:%[0-9]+]]:_(s32) = G_CONSTANT i32 255
     ; CHECK: [[COPY1:%[0-9]+]]:_(s32) = COPY [[C1]](s32)
-    ; CHECK: [[AND1:%[0-9]+]]:_(s32) = G_AND [[COPY1]], [[C4]]
-    ; CHECK: [[C5:%[0-9]+]]:_(s32) = G_CONSTANT i32 8
-    ; CHECK: [[SHL:%[0-9]+]]:_(s32) = G_SHL [[AND1]], [[C5]](s32)
-    ; CHECK: [[OR:%[0-9]+]]:_(s32) = G_OR [[AND]], [[SHL]]
-    ; CHECK: [[COPY2:%[0-9]+]]:_(s32) = COPY [[C2]](s32)
-    ; CHECK: [[AND2:%[0-9]+]]:_(s32) = G_AND [[COPY2]], [[C4]]
-    ; CHECK: [[C6:%[0-9]+]]:_(s32) = G_CONSTANT i32 16
-    ; CHECK: [[SHL1:%[0-9]+]]:_(s32) = G_SHL [[AND2]], [[C6]](s32)
-    ; CHECK: [[OR1:%[0-9]+]]:_(s32) = G_OR [[OR]], [[SHL1]]
-    ; CHECK: [[COPY3:%[0-9]+]]:_(s32) = COPY [[C3]](s32)
-    ; CHECK: [[AND3:%[0-9]+]]:_(s32) = G_AND [[COPY3]], [[C4]]
-    ; CHECK: [[C7:%[0-9]+]]:_(s32) = G_CONSTANT i32 24
-    ; CHECK: [[SHL2:%[0-9]+]]:_(s32) = G_SHL [[AND3]], [[C7]](s32)
-    ; CHECK: [[OR2:%[0-9]+]]:_(s32) = G_OR [[OR1]], [[SHL2]]
-    ; CHECK: $vgpr0 = COPY [[OR2]](s32)
+    ; CHECK: [[AND1:%[0-9]+]]:_(s32) = G_AND [[COPY1]], [[C6]]
+    ; CHECK: [[SHL:%[0-9]+]]:_(s32) = G_SHL [[AND1]], [[AND]](s32)
+    ; CHECK: [[COPY2:%[0-9]+]]:_(s32) = COPY [[C]](s32)
+    ; CHECK: [[AND2:%[0-9]+]]:_(s32) = G_AND [[COPY2]], [[C6]]
+    ; CHECK: [[COPY3:%[0-9]+]]:_(s32) = COPY [[SHL]](s32)
+    ; CHECK: [[OR:%[0-9]+]]:_(s32) = G_OR [[AND2]], [[COPY3]]
+    ; CHECK: [[TRUNC:%[0-9]+]]:_(s16) = G_TRUNC [[OR]](s32)
+    ; CHECK: [[C7:%[0-9]+]]:_(s32) = G_CONSTANT i32 8
+    ; CHECK: [[COPY4:%[0-9]+]]:_(s32) = COPY [[C7]](s32)
+    ; CHECK: [[AND3:%[0-9]+]]:_(s32) = G_AND [[COPY4]], [[C5]]
+    ; CHECK: [[COPY5:%[0-9]+]]:_(s32) = COPY [[C3]](s32)
+    ; CHECK: [[AND4:%[0-9]+]]:_(s32) = G_AND [[COPY5]], [[C6]]
+    ; CHECK: [[SHL1:%[0-9]+]]:_(s32) = G_SHL [[AND4]], [[AND3]](s32)
+    ; CHECK: [[COPY6:%[0-9]+]]:_(s32) = COPY [[C2]](s32)
+    ; CHECK: [[AND5:%[0-9]+]]:_(s32) = G_AND [[COPY6]], [[C6]]
+    ; CHECK: [[COPY7:%[0-9]+]]:_(s32) = COPY [[SHL1]](s32)
+    ; CHECK: [[OR1:%[0-9]+]]:_(s32) = G_OR [[AND5]], [[COPY7]]
+    ; CHECK: [[TRUNC1:%[0-9]+]]:_(s16) = G_TRUNC [[OR1]](s32)
+    ; CHECK: [[MV:%[0-9]+]]:_(s32) = G_MERGE_VALUES [[TRUNC]](s16), [[TRUNC1]](s16)
+    ; CHECK: $vgpr0 = COPY [[MV]](s32)
     %0:_(s8) = G_CONSTANT i8 0
     %1:_(s8) = G_CONSTANT i8 1
     %2:_(s8) = G_CONSTANT i8 2
@@ -147,3 +154,210 @@
     %8:_(s64) = G_MERGE_VALUES %4, %5, %6, %7
     $vgpr1_vgpr2 = COPY %8
 ...
+
+---
+name: test_merge_s64_s8_s8_s8_s8_s8_s8_s8_s8
+body: |
+  bb.0:
+    ; CHECK-LABEL: name: test_merge_s64_s8_s8_s8_s8_s8_s8_s8_s8
+    ; CHECK: [[C:%[0-9]+]]:_(s32) = G_CONSTANT i32 0
+    ; CHECK: [[C1:%[0-9]+]]:_(s32) = G_CONSTANT i32 1
+    ; CHECK: [[C2:%[0-9]+]]:_(s32) = G_CONSTANT i32 2
+    ; CHECK: [[C3:%[0-9]+]]:_(s32) = G_CONSTANT i32 3
+    ; CHECK: [[C4:%[0-9]+]]:_(s32) = G_CONSTANT i32 4
+    ; CHECK: [[C5:%[0-9]+]]:_(s32) = G_CONSTANT i32 5
+    ; CHECK: [[C6:%[0-9]+]]:_(s32) = G_CONSTANT i32 6
+    ; CHECK: [[C7:%[0-9]+]]:_(s32) = G_CONSTANT i32 7
+    ; CHECK: [[C8:%[0-9]+]]:_(s32) = G_CONSTANT i32 8
+    ; CHECK: [[C9:%[0-9]+]]:_(s32) = G_CONSTANT i32 65535
+    ; CHECK: [[COPY:%[0-9]+]]:_(s32) = COPY [[C8]](s32)
+    ; CHECK: [[AND:%[0-9]+]]:_(s32) = G_AND [[COPY]], [[C9]]
+    ; CHECK: [[C10:%[0-9]+]]:_(s32) = G_CONSTANT i32 255
+    ; CHECK: [[COPY1:%[0-9]+]]:_(s32) = COPY [[C1]](s32)
+    ; CHECK: [[AND1:%[0-9]+]]:_(s32) = G_AND [[COPY1]], [[C10]]
+    ; CHECK: [[SHL:%[0-9]+]]:_(s32) = G_SHL [[AND1]], [[AND]](s32)
+    ; CHECK: [[COPY2:%[0-9]+]]:_(s32) = COPY [[C]](s32)
+    ; CHECK: [[AND2:%[0-9]+]]:_(s32) = G_AND [[COPY2]], [[C10]]
+    ; CHECK: [[COPY3:%[0-9]+]]:_(s32) = COPY [[SHL]](s32)
+    ; CHECK: [[OR:%[0-9]+]]:_(s32) = G_OR [[AND2]], [[COPY3]]
+    ; CHECK: [[TRUNC:%[0-9]+]]:_(s16) = G_TRUNC [[OR]](s32)
+    ; CHECK: [[C11:%[0-9]+]]:_(s32) = G_CONSTANT i32 8
+    ; CHECK: [[COPY4:%[0-9]+]]:_(s32) = COPY [[C11]](s32)
+    ; CHECK: [[AND3:%[0-9]+]]:_(s32) = G_AND [[COPY4]], [[C9]]
+    ; CHECK: [[COPY5:%[0-9]+]]:_(s32) = COPY [[C3]](s32)
+    ; CHECK: [[AND4:%[0-9]+]]:_(s32) = G_AND [[COPY5]], [[C10]]
+    ; CHECK: [[SHL1:%[0-9]+]]:_(s32) = G_SHL [[AND4]], [[AND3]](s32)
+    ; CHECK: [[COPY6:%[0-9]+]]:_(s32) = COPY [[C2]](s32)
+    ; CHECK: [[AND5:%[0-9]+]]:_(s32) = G_AND [[COPY6]], [[C10]]
+    ; CHECK: [[COPY7:%[0-9]+]]:_(s32) = COPY [[SHL1]](s32)
+    ; CHECK: [[OR1:%[0-9]+]]:_(s32) = G_OR [[AND5]], [[COPY7]]
+    ; CHECK: [[TRUNC1:%[0-9]+]]:_(s16) = G_TRUNC [[OR1]](s32)
+    ; CHECK: [[C12:%[0-9]+]]:_(s32) = G_CONSTANT i32 8
+    ; CHECK: [[COPY8:%[0-9]+]]:_(s32) = COPY [[C12]](s32)
+    ; CHECK: [[AND6:%[0-9]+]]:_(s32) = G_AND [[COPY8]], [[C9]]
+    ; CHECK: [[COPY9:%[0-9]+]]:_(s32) = COPY [[C5]](s32)
+    ; CHECK: [[AND7:%[0-9]+]]:_(s32) = G_AND [[COPY9]], [[C10]]
+    ; CHECK: [[SHL2:%[0-9]+]]:_(s32) = G_SHL [[AND7]], [[AND6]](s32)
+    ; CHECK: [[COPY10:%[0-9]+]]:_(s32) = COPY [[C4]](s32)
+    ; CHECK: [[AND8:%[0-9]+]]:_(s32) = G_AND [[COPY10]], [[C10]]
+    ; CHECK: [[COPY11:%[0-9]+]]:_(s32) = COPY [[SHL2]](s32)
+    ; CHECK: [[OR2:%[0-9]+]]:_(s32) = G_OR [[AND8]], [[COPY11]]
+    ; CHECK: [[TRUNC2:%[0-9]+]]:_(s16) = G_TRUNC [[OR2]](s32)
+    ; CHECK: [[C13:%[0-9]+]]:_(s32) = G_CONSTANT i32 8
+    ; CHECK: [[COPY12:%[0-9]+]]:_(s32) = COPY [[C13]](s32)
+    ; CHECK: [[AND9:%[0-9]+]]:_(s32) = G_AND [[COPY12]], [[C9]]
+    ; CHECK: [[COPY13:%[0-9]+]]:_(s32) = COPY [[C7]](s32)
+    ; CHECK: [[AND10:%[0-9]+]]:_(s32) = G_AND [[COPY13]], [[C10]]
+    ; CHECK: [[SHL3:%[0-9]+]]:_(s32) = G_SHL [[AND10]], [[AND9]](s32)
+    ; CHECK: [[COPY14:%[0-9]+]]:_(s32) = COPY [[C6]](s32)
+    ; CHECK: [[AND11:%[0-9]+]]:_(s32) = G_AND [[COPY14]], [[C10]]
+    ; CHECK: [[COPY15:%[0-9]+]]:_(s32) = COPY [[SHL3]](s32)
+    ; CHECK: [[OR3:%[0-9]+]]:_(s32) = G_OR [[AND11]], [[COPY15]]
+    ; CHECK: [[TRUNC3:%[0-9]+]]:_(s16) = G_TRUNC [[OR3]](s32)
+    ; CHECK: [[MV:%[0-9]+]]:_(s64) = G_MERGE_VALUES [[TRUNC]](s16), [[TRUNC1]](s16), [[TRUNC2]](s16), [[TRUNC3]](s16)
+    ; CHECK: $vgpr0_vgpr1 = COPY [[MV]](s64)
+    %0:_(s8) = G_CONSTANT i8 0
+    %1:_(s8) = G_CONSTANT i8 1
+    %2:_(s8) = G_CONSTANT i8 2
+    %3:_(s8) = G_CONSTANT i8 3
+    %4:_(s8) = G_CONSTANT i8 4
+    %5:_(s8) = G_CONSTANT i8 5
+    %6:_(s8) = G_CONSTANT i8 6
+    %7:_(s8) = G_CONSTANT i8 7
+    %8:_(s64) = G_MERGE_VALUES %0, %1, %2, %3, %4, %5, %6, %7
+    $vgpr0_vgpr1 = COPY %8
+...
+
+---
+name: test_merge_s96_s8_s8_s8_s8_s8_s8_s8_s8_s8_s8_s8_s8
+body: |
+  bb.0:
+    ; CHECK-LABEL: name: test_merge_s96_s8_s8_s8_s8_s8_s8_s8_s8_s8_s8_s8_s8
+    ; CHECK: [[C:%[0-9]+]]:_(s32) = G_CONSTANT i32 0
+    ; CHECK: [[C1:%[0-9]+]]:_(s32) = G_CONSTANT i32 1
+    ; CHECK: [[C2:%[0-9]+]]:_(s32) = G_CONSTANT i32 2
+    ; CHECK: [[C3:%[0-9]+]]:_(s32) = G_CONSTANT i32 3
+    ; CHECK: [[C4:%[0-9]+]]:_(s32) = G_CONSTANT i32 4
+    ; CHECK: [[C5:%[0-9]+]]:_(s32) = G_CONSTANT i32 5
+    ; CHECK: [[C6:%[0-9]+]]:_(s32) = G_CONSTANT i32 6
+    ; CHECK: [[C7:%[0-9]+]]:_(s32) = G_CONSTANT i32 7
+    ; CHECK: [[C8:%[0-9]+]]:_(s32) = G_CONSTANT i32 8
+    ; CHECK: [[C9:%[0-9]+]]:_(s32) = G_CONSTANT i32 9
+    ; CHECK: [[C10:%[0-9]+]]:_(s32) = G_CONSTANT i32 10
+    ; CHECK: [[C11:%[0-9]+]]:_(s32) = G_CONSTANT i32 11
+    ; CHECK: [[C12:%[0-9]+]]:_(s32) = G_CONSTANT i32 8
+    ; CHECK: [[C13:%[0-9]+]]:_(s32) = G_CONSTANT i32 65535
+    ; CHECK: [[COPY:%[0-9]+]]:_(s32) = COPY [[C12]](s32)
+    ; CHECK: [[AND:%[0-9]+]]:_(s32) = G_AND [[COPY]], [[C13]]
+    ; CHECK: [[C14:%[0-9]+]]:_(s32) = G_CONSTANT i32 255
+    ; CHECK: [[COPY1:%[0-9]+]]:_(s32) = COPY [[C1]](s32)
+    ; CHECK: [[AND1:%[0-9]+]]:_(s32) = G_AND [[COPY1]], [[C14]]
+    ; CHECK: [[SHL:%[0-9]+]]:_(s32) = G_SHL [[AND1]], [[AND]](s32)
+    ; CHECK: [[COPY2:%[0-9]+]]:_(s32) = COPY [[C]](s32)
+    ; CHECK: [[AND2:%[0-9]+]]:_(s32) = G_AND [[COPY2]], [[C14]]
+    ; CHECK: [[COPY3:%[0-9]+]]:_(s32) = COPY [[SHL]](s32)
+    ; CHECK: [[OR:%[0-9]+]]:_(s32) = G_OR [[AND2]], [[COPY3]]
+    ; CHECK: [[TRUNC:%[0-9]+]]:_(s16) = G_TRUNC [[OR]](s32)
+    ; CHECK: [[C15:%[0-9]+]]:_(s32) = G_CONSTANT i32 8
+    ; CHECK: [[COPY4:%[0-9]+]]:_(s32) = COPY [[C15]](s32)
+    ; CHECK: [[AND3:%[0-9]+]]:_(s32) = G_AND [[COPY4]], [[C13]]
+    ; CHECK: [[COPY5:%[0-9]+]]:_(s32) = COPY [[C3]](s32)
+    ; CHECK: [[AND4:%[0-9]+]]:_(s32) = G_AND [[COPY5]], [[C14]]
+    ; CHECK: [[SHL1:%[0-9]+]]:_(s32) = G_SHL [[AND4]], [[AND3]](s32)
+    ; CHECK: [[COPY6:%[0-9]+]]:_(s32) = COPY [[C2]](s32)
+    ; CHECK: [[AND5:%[0-9]+]]:_(s32) = G_AND [[COPY6]], [[C14]]
+    ; CHECK: [[COPY7:%[0-9]+]]:_(s32) = COPY [[SHL1]](s32)
+    ; CHECK: [[OR1:%[0-9]+]]:_(s32) = G_OR [[AND5]], [[COPY7]]
+    ; CHECK: [[TRUNC1:%[0-9]+]]:_(s16) = G_TRUNC [[OR1]](s32)
+    ; CHECK: [[C16:%[0-9]+]]:_(s32) = G_CONSTANT i32 8
+    ; CHECK: [[COPY8:%[0-9]+]]:_(s32) = COPY [[C16]](s32)
+    ; CHECK: [[AND6:%[0-9]+]]:_(s32) = G_AND [[COPY8]], [[C13]]
+    ; CHECK: [[COPY9:%[0-9]+]]:_(s32) = COPY [[C5]](s32)
+    ; CHECK: [[AND7:%[0-9]+]]:_(s32) = G_AND [[COPY9]], [[C14]]
+    ; CHECK: [[SHL2:%[0-9]+]]:_(s32) = G_SHL [[AND7]], [[AND6]](s32)
+    ; CHECK: [[COPY10:%[0-9]+]]:_(s32) = COPY [[C4]](s32)
+    ; CHECK: [[AND8:%[0-9]+]]:_(s32) = G_AND [[COPY10]], [[C14]]
+    ; CHECK: [[COPY11:%[0-9]+]]:_(s32) = COPY [[SHL2]](s32)
+    ; CHECK: [[OR2:%[0-9]+]]:_(s32) = G_OR [[AND8]], [[COPY11]]
+    ; CHECK: [[TRUNC2:%[0-9]+]]:_(s16) = G_TRUNC [[OR2]](s32)
+    ; CHECK: [[C17:%[0-9]+]]:_(s32) = G_CONSTANT i32 8
+    ; CHECK: [[COPY12:%[0-9]+]]:_(s32) = COPY [[C17]](s32)
+    ; CHECK: [[AND9:%[0-9]+]]:_(s32) = G_AND [[COPY12]], [[C13]]
+    ; CHECK: [[COPY13:%[0-9]+]]:_(s32) = COPY [[C7]](s32)
+    ; CHECK: [[AND10:%[0-9]+]]:_(s32) = G_AND [[COPY13]], [[C14]]
+    ; CHECK: [[SHL3:%[0-9]+]]:_(s32) = G_SHL [[AND10]], [[AND9]](s32)
+    ; CHECK: [[COPY14:%[0-9]+]]:_(s32) = COPY [[C6]](s32)
+    ; CHECK: [[AND11:%[0-9]+]]:_(s32) = G_AND [[COPY14]], [[C14]]
+    ; CHECK: [[COPY15:%[0-9]+]]:_(s32) = COPY [[SHL3]](s32)
+    ; CHECK: [[OR3:%[0-9]+]]:_(s32) = G_OR [[AND11]], [[COPY15]]
+    ; CHECK: [[TRUNC3:%[0-9]+]]:_(s16) = G_TRUNC [[OR3]](s32)
+    ; CHECK: [[C18:%[0-9]+]]:_(s32) = G_CONSTANT i32 8
+    ; CHECK: [[COPY16:%[0-9]+]]:_(s32) = COPY [[C18]](s32)
+    ; CHECK: [[AND12:%[0-9]+]]:_(s32) = G_AND [[COPY16]], [[C13]]
+    ; CHECK: [[COPY17:%[0-9]+]]:_(s32) = COPY [[C9]](s32)
+    ; CHECK: [[AND13:%[0-9]+]]:_(s32) = G_AND [[COPY17]], [[C14]]
+    ; CHECK: [[SHL4:%[0-9]+]]:_(s32) = G_SHL [[AND13]], [[AND12]](s32)
+    ; CHECK: [[COPY18:%[0-9]+]]:_(s32) = COPY [[C8]](s32)
+    ; CHECK: [[AND14:%[0-9]+]]:_(s32) = G_AND [[COPY18]], [[C14]]
+    ; CHECK: [[COPY19:%[0-9]+]]:_(s32) = COPY [[SHL4]](s32)
+    ; CHECK: [[OR4:%[0-9]+]]:_(s32) = G_OR [[AND14]], [[COPY19]]
+    ; CHECK: [[TRUNC4:%[0-9]+]]:_(s16) = G_TRUNC [[OR4]](s32)
+    ; CHECK: [[C19:%[0-9]+]]:_(s32) = G_CONSTANT i32 8
+    ; CHECK: [[COPY20:%[0-9]+]]:_(s32) = COPY [[C19]](s32)
+    ; CHECK: [[AND15:%[0-9]+]]:_(s32) = G_AND [[COPY20]], [[C13]]
+    ; CHECK: [[COPY21:%[0-9]+]]:_(s32) = COPY [[C11]](s32)
+    ; CHECK: [[AND16:%[0-9]+]]:_(s32) = G_AND [[COPY21]], [[C14]]
+    ; CHECK: [[SHL5:%[0-9]+]]:_(s32) = G_SHL [[AND16]], [[AND15]](s32)
+    ; CHECK: [[COPY22:%[0-9]+]]:_(s32) = COPY [[C10]](s32)
+    ; CHECK: [[AND17:%[0-9]+]]:_(s32) = G_AND [[COPY22]], [[C14]]
+    ; CHECK: [[COPY23:%[0-9]+]]:_(s32) = COPY [[SHL5]](s32)
+    ; CHECK: [[OR5:%[0-9]+]]:_(s32) = G_OR [[AND17]], [[COPY23]]
+    ; CHECK: [[TRUNC5:%[0-9]+]]:_(s16) = G_TRUNC [[OR5]](s32)
+    ; CHECK: [[MV:%[0-9]+]]:_(s96) = G_MERGE_VALUES [[TRUNC]](s16), [[TRUNC1]](s16), [[TRUNC2]](s16), [[TRUNC3]](s16), [[TRUNC4]](s16), [[TRUNC5]](s16)
+    ; CHECK: $vgpr0_vgpr1_vgpr2 = COPY [[MV]](s96)
+    %0:_(s8) = G_CONSTANT i8 0
+    %1:_(s8) = G_CONSTANT i8 1
+    %2:_(s8) = G_CONSTANT i8 2
+    %3:_(s8) = G_CONSTANT i8 3
+    %4:_(s8) = G_CONSTANT i8 4
+    %5:_(s8) = G_CONSTANT i8 5
+    %6:_(s8) = G_CONSTANT i8 6
+    %7:_(s8) = G_CONSTANT i8 7
+    %9:_(s8) = G_CONSTANT i8 8
+    %10:_(s8) = G_CONSTANT i8 9
+    %11:_(s8) = G_CONSTANT i8 10
+    %12:_(s8) = G_CONSTANT i8 11
+
+    %13:_(s96) = G_MERGE_VALUES %0, %1, %2, %3, %4, %5, %6, %7, %9, %10, %11, %12
+    $vgpr0_vgpr1_vgpr2 = COPY %13
+...
+
+---
+name: test_merge_s96_s16_s16_s16_s16_s16_s16
+body: |
+  bb.0:
+    ; CHECK-LABEL: name: test_merge_s96_s16_s16_s16_s16_s16_s16
+    ; CHECK: [[C:%[0-9]+]]:_(s32) = G_CONSTANT i32 0
+    ; CHECK: [[TRUNC:%[0-9]+]]:_(s16) = G_TRUNC [[C]](s32)
+    ; CHECK: [[C1:%[0-9]+]]:_(s32) = G_CONSTANT i32 1
+    ; CHECK: [[TRUNC1:%[0-9]+]]:_(s16) = G_TRUNC [[C1]](s32)
+    ; CHECK: [[C2:%[0-9]+]]:_(s32) = G_CONSTANT i32 2
+    ; CHECK: [[TRUNC2:%[0-9]+]]:_(s16) = G_TRUNC [[C2]](s32)
+    ; CHECK: [[C3:%[0-9]+]]:_(s32) = G_CONSTANT i32 3
+    ; CHECK: [[TRUNC3:%[0-9]+]]:_(s16) = G_TRUNC [[C3]](s32)
+    ; CHECK: [[C4:%[0-9]+]]:_(s32) = G_CONSTANT i32 4
+    ; CHECK: [[TRUNC4:%[0-9]+]]:_(s16) = G_TRUNC [[C4]](s32)
+    ; CHECK: [[C5:%[0-9]+]]:_(s32) = G_CONSTANT i32 5
+    ; CHECK: [[TRUNC5:%[0-9]+]]:_(s16) = G_TRUNC [[C5]](s32)
+    ; CHECK: [[MV:%[0-9]+]]:_(s96) = G_MERGE_VALUES [[TRUNC]](s16), [[TRUNC1]](s16), [[TRUNC2]](s16), [[TRUNC3]](s16), [[TRUNC4]](s16), [[TRUNC5]](s16)
+    ; CHECK: $vgpr0_vgpr1_vgpr2 = COPY [[MV]](s96)
+    %0:_(s16) = G_CONSTANT i16 0
+    %1:_(s16) = G_CONSTANT i16 1
+    %2:_(s16) = G_CONSTANT i16 2
+    %3:_(s16) = G_CONSTANT i16 3
+    %4:_(s16) = G_CONSTANT i16 4
+    %5:_(s16) = G_CONSTANT i16 5
+
+    %8:_(s96) = G_MERGE_VALUES %0, %1, %2, %3, %4, %5
+    $vgpr0_vgpr1_vgpr2 = COPY %8
+...