[GlobalISel] Add G_BUILD_VECTOR[_TRUNC] to CSE

[rovka]

Summary

Add G_BUILD_VECTOR and G_BUILD_VECTOR_TRUNC to the list of opcodes in
shouldCSEOpc. This simplifies the code generated for vector splats.

[foad]

LGTM!

llvm/test/CodeGen/AArch64/GlobalISel/prelegalizer-combiner-mulo-zero.mir

91

What happened here?

llvm/test/CodeGen/AMDGPU/GlobalISel/legalize-build-vector-splat.mir

1

Maybe precommit this test so we can see the diff?

[rovka]

llvm/test/CodeGen/AArch64/GlobalISel/prelegalizer-combiner-mulo-zero.mir

91

Well, my hypothesis is that:
Without CSE for G_BUILD_VECTOR, we replace the G_UMULO with a brand new G_BUILD_VECTOR, thus leaving the already existing G_BUILD_VECTOR (%zero_vec) without a use, so it just gets removed.
With CSE enabled, when we try to build the new G_BUILD_VECTOR for our combine, we notice we already have one and just copy it, so now it has a use and can't be dropped. I'm not sure why we don't notice that we can use it directly instead of copying though.
I could dig deeper into this, unless we have some code elsewhere in the pipeline that gets rid of redundant copies?

llvm/test/CodeGen/AMDGPU/GlobalISel/legalize-build-vector-splat.mir

1

Sure

[rovka]

Rebase.

[foad]

llvm/test/CodeGen/AArch64/GlobalISel/prelegalizer-combiner-mulo-zero.mir

91

There is a "copy_prop" combine that should do that, and AArch64PreLegalizerCombiner runs "all_combines", so I don't understand why it's not happening.

[rovka]

llvm/test/CodeGen/AArch64/GlobalISel/prelegalizer-combiner-mulo-zero.mir

91

Oh, that's easy then, the test is run with --aarch64prelegalizercombinerhelper-only-enable-rule="mulo_by_0" :)

[foad]

llvm/test/CodeGen/AArch64/GlobalISel/prelegalizer-combiner-mulo-zero.mir

91

Thanks! I did not even know you could do that.

llvm/lib/CodeGen/GlobalISel/CSEInfo.cpp

bool CSEConfigFull::shouldCSEOpc(unsigned Opc) {
   case TargetOpcode::G_ZEXT:
   case TargetOpcode::G_SEXT:
   case TargetOpcode::G_ANYEXT:
   case TargetOpcode::G_UNMERGE_VALUES:
   case TargetOpcode::G_TRUNC:
   case TargetOpcode::G_PTR_ADD:
   case TargetOpcode::G_EXTRACT:
   case TargetOpcode::G_SELECT:
+  case TargetOpcode::G_BUILD_VECTOR:
+  case TargetOpcode::G_BUILD_VECTOR_TRUNC:
     return true;
   }
   return false;
 }
 
 bool CSEConfigConstantOnly::shouldCSEOpc(unsigned Opc) {
   return Opc == TargetOpcode::G_CONSTANT || Opc == TargetOpcode::G_FCONSTANT ||
          Opc == TargetOpcode::G_IMPLICIT_DEF;

llvm/test/CodeGen/AArch64/GlobalISel/combine-udiv.ll

 ; SDAG-NEXT:    usra v1.8h, v0.8h, #1
 ; SDAG-NEXT:    ldr q0, [x8, :lo12:.LCPI3_1]
 ; SDAG-NEXT:    ushl v0.8h, v1.8h, v0.8h
 ; SDAG-NEXT:    ret
 ;
 ; GISEL-LABEL: combine_vec_udiv_nonuniform3:
 ; GISEL:       // %bb.0:
 ; GISEL-NEXT:    adrp x8, .LCPI3_2
-; GISEL-NEXT:    adrp x9, .LCPI3_3
+; GISEL-NEXT:    adrp x9, .LCPI3_1
 ; GISEL-NEXT:    ldr q1, [x8, :lo12:.LCPI3_2]
-; GISEL-NEXT:    adrp x8, .LCPI3_1
-; GISEL-NEXT:    ldr q4, [x9, :lo12:.LCPI3_3]
+; GISEL-NEXT:    adrp x8, .LCPI3_3
+; GISEL-NEXT:    ldr q3, [x9, :lo12:.LCPI3_1]
 ; GISEL-NEXT:    umull2 v2.4s, v0.8h, v1.8h
 ; GISEL-NEXT:    umull v1.4s, v0.4h, v1.4h
+; GISEL-NEXT:    neg v3.8h, v3.8h
 ; GISEL-NEXT:    uzp2 v1.8h, v1.8h, v2.8h
-; GISEL-NEXT:    ldr q2, [x8, :lo12:.LCPI3_1]
+; GISEL-NEXT:    ldr q2, [x8, :lo12:.LCPI3_3]
 ; GISEL-NEXT:    adrp x8, .LCPI3_0
-; GISEL-NEXT:    neg v2.8h, v2.8h
-; GISEL-NEXT:    sub v3.8h, v0.8h, v1.8h
-; GISEL-NEXT:    usra v1.8h, v3.8h, #1
-; GISEL-NEXT:    ldr q3, [x8, :lo12:.LCPI3_0]
-; GISEL-NEXT:    ushl v1.8h, v1.8h, v2.8h
-; GISEL-NEXT:    cmeq v2.8h, v4.8h, v3.8h
+; GISEL-NEXT:    sub v4.8h, v0.8h, v1.8h
+; GISEL-NEXT:    ldr q5, [x8, :lo12:.LCPI3_0]
+; GISEL-NEXT:    usra v1.8h, v4.8h, #1
+; GISEL-NEXT:    cmeq v2.8h, v2.8h, v5.8h
+; GISEL-NEXT:    ushl v1.8h, v1.8h, v3.8h
 ; GISEL-NEXT:    bif v0.16b, v1.16b, v2.16b
 ; GISEL-NEXT:    ret
   %1 = udiv <8 x i16> %x, <i16 7, i16 23, i16 25, i16 27, i16 31, i16 47, i16 63, i16 127>
   ret <8 x i16> %1
 }
 
 define <16 x i8> @combine_vec_udiv_nonuniform4(<16 x i8> %x) {
 ; SDAG-LABEL: combine_vec_udiv_nonuniform4:

llvm/test/CodeGen/AArch64/GlobalISel/combine-udiv.mir

bb.1:
     ; CHECK-NEXT: [[BUILD_VECTOR2:%[0-9]+]]:_(<8 x s16>) = G_BUILD_VECTOR [[C9]](s16), [[C11]](s16), [[C11]](s16), [[C11]](s16), [[C11]](s16), [[C16]](s16), [[C16]](s16), [[C19]](s16)
     ; CHECK-NEXT: [[UMULH:%[0-9]+]]:_(<8 x s16>) = G_UMULH [[COPY]], [[BUILD_VECTOR1]]
     ; CHECK-NEXT: [[SUB:%[0-9]+]]:_(<8 x s16>) = G_SUB [[COPY]], [[UMULH]]
     ; CHECK-NEXT: [[C20:%[0-9]+]]:_(s16) = G_CONSTANT i16 1
     ; CHECK-NEXT: [[BUILD_VECTOR3:%[0-9]+]]:_(<8 x s16>) = G_BUILD_VECTOR [[C20]](s16), [[C20]](s16), [[C20]](s16), [[C20]](s16), [[C20]](s16), [[C20]](s16), [[C20]](s16), [[C20]](s16)
     ; CHECK-NEXT: [[LSHR:%[0-9]+]]:_(<8 x s16>) = G_LSHR [[SUB]], [[BUILD_VECTOR3]](<8 x s16>)
     ; CHECK-NEXT: [[ADD:%[0-9]+]]:_(<8 x s16>) = G_ADD [[LSHR]], [[UMULH]]
     ; CHECK-NEXT: [[LSHR1:%[0-9]+]]:_(<8 x s16>) = G_LSHR [[ADD]], [[BUILD_VECTOR2]](<8 x s16>)
-    ; CHECK-NEXT: [[BUILD_VECTOR4:%[0-9]+]]:_(<8 x s16>) = G_BUILD_VECTOR [[C20]](s16), [[C20]](s16), [[C20]](s16), [[C20]](s16), [[C20]](s16), [[C20]](s16), [[C20]](s16), [[C20]](s16)
-    ; CHECK-NEXT: [[ICMP:%[0-9]+]]:_(<8 x s1>) = G_ICMP intpred(eq), [[BUILD_VECTOR]](<8 x s16>), [[BUILD_VECTOR4]]
+    ; CHECK-NEXT: [[ICMP:%[0-9]+]]:_(<8 x s1>) = G_ICMP intpred(eq), [[BUILD_VECTOR]](<8 x s16>), [[BUILD_VECTOR3]]
     ; CHECK-NEXT: [[SELECT:%[0-9]+]]:_(<8 x s16>) = G_SELECT [[ICMP]](<8 x s1>), [[COPY]], [[LSHR1]]
     ; CHECK-NEXT: $q0 = COPY [[SELECT]](<8 x s16>)
     ; CHECK-NEXT: RET_ReallyLR implicit $q0
     %0:_(<8 x s16>) = COPY $q0
     %2:_(s16) = G_CONSTANT i16 7
     %3:_(s16) = G_CONSTANT i16 23
     %4:_(s16) = G_CONSTANT i16 25
     %5:_(s16) = G_CONSTANT i16 27

llvm/test/CodeGen/AArch64/GlobalISel/legalize-fp-arith.mir

 ...
 ---
 name:            test_fmul_v8s32
 body:             |
   bb.0.entry:
     ; CHECK-LABEL: name: test_fmul_v8s32
     ; CHECK: [[DEF:%[0-9]+]]:_(s32) = G_IMPLICIT_DEF
     ; CHECK: [[BUILD_VECTOR:%[0-9]+]]:_(<4 x s32>) = G_BUILD_VECTOR [[DEF]](s32), [[DEF]](s32), [[DEF]](s32), [[DEF]](s32)
-    ; CHECK: [[BUILD_VECTOR1:%[0-9]+]]:_(<4 x s32>) = G_BUILD_VECTOR [[DEF]](s32), [[DEF]](s32), [[DEF]](s32), [[DEF]](s32)
-    ; CHECK: [[BUILD_VECTOR2:%[0-9]+]]:_(<4 x s32>) = G_BUILD_VECTOR [[DEF]](s32), [[DEF]](s32), [[DEF]](s32), [[DEF]](s32)
-    ; CHECK: [[BUILD_VECTOR3:%[0-9]+]]:_(<4 x s32>) = G_BUILD_VECTOR [[DEF]](s32), [[DEF]](s32), [[DEF]](s32), [[DEF]](s32)
-    ; CHECK: [[FMUL:%[0-9]+]]:_(<4 x s32>) = G_FMUL [[BUILD_VECTOR]], [[BUILD_VECTOR2]]
-    ; CHECK: [[FMUL1:%[0-9]+]]:_(<4 x s32>) = G_FMUL [[BUILD_VECTOR1]], [[BUILD_VECTOR3]]
+    ; CHECK: [[FMUL:%[0-9]+]]:_(<4 x s32>) = G_FMUL [[BUILD_VECTOR]], [[BUILD_VECTOR]]
+    ; CHECK: [[FMUL1:%[0-9]+]]:_(<4 x s32>) = G_FMUL [[BUILD_VECTOR]], [[BUILD_VECTOR]]
     ; CHECK: $q0 = COPY [[FMUL]](<4 x s32>)
     ; CHECK: $q1 = COPY [[FMUL1]](<4 x s32>)
     %0:_(<8 x s32>) = G_IMPLICIT_DEF
     %1:_(<8 x s32>) = G_IMPLICIT_DEF
     %2:_(<8 x s32>) = G_FMUL %0, %1
     %uv1:_(<4 x s32>), %uv2:_(<4 x s32>) = G_UNMERGE_VALUES %2
     $q0 = COPY %uv1(<4 x s32>)
     $q1 = COPY %uv2(<4 x s32>)
 ...

llvm/test/CodeGen/AArch64/GlobalISel/legalize-min-max.mir

body: |
   bb.0:
     liveins: $x0, $q0, $q1
 
     ; CHECK-LABEL: name: v32s8_smin
     ; CHECK: liveins: $x0, $q0, $q1
     ; CHECK-NEXT: {{  $}}
     ; CHECK-NEXT: [[DEF:%[0-9]+]]:_(s8) = G_IMPLICIT_DEF
     ; CHECK-NEXT: [[BUILD_VECTOR:%[0-9]+]]:_(<16 x s8>) = G_BUILD_VECTOR [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8)
-    ; CHECK-NEXT: [[BUILD_VECTOR1:%[0-9]+]]:_(<16 x s8>) = G_BUILD_VECTOR [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8)
-    ; CHECK-NEXT: [[BUILD_VECTOR2:%[0-9]+]]:_(<16 x s8>) = G_BUILD_VECTOR [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8)
-    ; CHECK-NEXT: [[BUILD_VECTOR3:%[0-9]+]]:_(<16 x s8>) = G_BUILD_VECTOR [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8)
-    ; CHECK-NEXT: [[SMIN:%[0-9]+]]:_(<16 x s8>) = G_SMIN [[BUILD_VECTOR]], [[BUILD_VECTOR2]]
-    ; CHECK-NEXT: [[SMIN1:%[0-9]+]]:_(<16 x s8>) = G_SMIN [[BUILD_VECTOR1]], [[BUILD_VECTOR3]]
+    ; CHECK-NEXT: [[SMIN:%[0-9]+]]:_(<16 x s8>) = G_SMIN [[BUILD_VECTOR]], [[BUILD_VECTOR]]
+    ; CHECK-NEXT: [[SMIN1:%[0-9]+]]:_(<16 x s8>) = G_SMIN [[BUILD_VECTOR]], [[BUILD_VECTOR]]
     ; CHECK-NEXT: [[COPY:%[0-9]+]]:_(p0) = COPY $x0
     ; CHECK-NEXT: G_STORE [[SMIN]](<16 x s8>), [[COPY]](p0) :: (store (<16 x s8>), align 32)
     ; CHECK-NEXT: [[C:%[0-9]+]]:_(s64) = G_CONSTANT i64 16
     ; CHECK-NEXT: [[PTR_ADD:%[0-9]+]]:_(p0) = G_PTR_ADD [[COPY]], [[C]](s64)
     ; CHECK-NEXT: G_STORE [[SMIN1]](<16 x s8>), [[PTR_ADD]](p0) :: (store (<16 x s8>) into unknown-address + 16)
     %vec:_(<32 x s8>) = G_IMPLICIT_DEF
     %vec1:_(<32 x s8>) = G_IMPLICIT_DEF
     %smin:_(<32 x s8>) = G_SMIN %vec, %vec1
body: |
   bb.0:
     liveins: $x0, $q0, $q1
 
     ; CHECK-LABEL: name: v16s16_smin
     ; CHECK: liveins: $x0, $q0, $q1
     ; CHECK-NEXT: {{  $}}
     ; CHECK-NEXT: [[DEF:%[0-9]+]]:_(s16) = G_IMPLICIT_DEF
     ; CHECK-NEXT: [[BUILD_VECTOR:%[0-9]+]]:_(<8 x s16>) = G_BUILD_VECTOR [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16)
-    ; CHECK-NEXT: [[BUILD_VECTOR1:%[0-9]+]]:_(<8 x s16>) = G_BUILD_VECTOR [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16)
-    ; CHECK-NEXT: [[BUILD_VECTOR2:%[0-9]+]]:_(<8 x s16>) = G_BUILD_VECTOR [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16)
-    ; CHECK-NEXT: [[BUILD_VECTOR3:%[0-9]+]]:_(<8 x s16>) = G_BUILD_VECTOR [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16)
-    ; CHECK-NEXT: [[SMIN:%[0-9]+]]:_(<8 x s16>) = G_SMIN [[BUILD_VECTOR]], [[BUILD_VECTOR2]]
-    ; CHECK-NEXT: [[SMIN1:%[0-9]+]]:_(<8 x s16>) = G_SMIN [[BUILD_VECTOR1]], [[BUILD_VECTOR3]]
+    ; CHECK-NEXT: [[SMIN:%[0-9]+]]:_(<8 x s16>) = G_SMIN [[BUILD_VECTOR]], [[BUILD_VECTOR]]
+    ; CHECK-NEXT: [[SMIN1:%[0-9]+]]:_(<8 x s16>) = G_SMIN [[BUILD_VECTOR]], [[BUILD_VECTOR]]
     ; CHECK-NEXT: [[COPY:%[0-9]+]]:_(p0) = COPY $x0
     ; CHECK-NEXT: G_STORE [[SMIN]](<8 x s16>), [[COPY]](p0) :: (store (<8 x s16>), align 32)
     ; CHECK-NEXT: [[C:%[0-9]+]]:_(s64) = G_CONSTANT i64 16
     ; CHECK-NEXT: [[PTR_ADD:%[0-9]+]]:_(p0) = G_PTR_ADD [[COPY]], [[C]](s64)
     ; CHECK-NEXT: G_STORE [[SMIN1]](<8 x s16>), [[PTR_ADD]](p0) :: (store (<8 x s16>) into unknown-address + 16)
     %vec:_(<16 x s16>) = G_IMPLICIT_DEF
     %vec1:_(<16 x s16>) = G_IMPLICIT_DEF
     %smin:_(<16 x s16>) = G_SMIN %vec, %vec1
body: |
   bb.0:
     liveins: $x0, $q0, $q1
 
     ; CHECK-LABEL: name: v8s32_smin
     ; CHECK: liveins: $x0, $q0, $q1
     ; CHECK-NEXT: {{  $}}
     ; CHECK-NEXT: [[DEF:%[0-9]+]]:_(s32) = G_IMPLICIT_DEF
     ; CHECK-NEXT: [[BUILD_VECTOR:%[0-9]+]]:_(<4 x s32>) = G_BUILD_VECTOR [[DEF]](s32), [[DEF]](s32), [[DEF]](s32), [[DEF]](s32)
-    ; CHECK-NEXT: [[BUILD_VECTOR1:%[0-9]+]]:_(<4 x s32>) = G_BUILD_VECTOR [[DEF]](s32), [[DEF]](s32), [[DEF]](s32), [[DEF]](s32)
-    ; CHECK-NEXT: [[BUILD_VECTOR2:%[0-9]+]]:_(<4 x s32>) = G_BUILD_VECTOR [[DEF]](s32), [[DEF]](s32), [[DEF]](s32), [[DEF]](s32)
-    ; CHECK-NEXT: [[BUILD_VECTOR3:%[0-9]+]]:_(<4 x s32>) = G_BUILD_VECTOR [[DEF]](s32), [[DEF]](s32), [[DEF]](s32), [[DEF]](s32)
-    ; CHECK-NEXT: [[SMIN:%[0-9]+]]:_(<4 x s32>) = G_SMIN [[BUILD_VECTOR]], [[BUILD_VECTOR2]]
-    ; CHECK-NEXT: [[SMIN1:%[0-9]+]]:_(<4 x s32>) = G_SMIN [[BUILD_VECTOR1]], [[BUILD_VECTOR3]]
+    ; CHECK-NEXT: [[SMIN:%[0-9]+]]:_(<4 x s32>) = G_SMIN [[BUILD_VECTOR]], [[BUILD_VECTOR]]
+    ; CHECK-NEXT: [[SMIN1:%[0-9]+]]:_(<4 x s32>) = G_SMIN [[BUILD_VECTOR]], [[BUILD_VECTOR]]
     ; CHECK-NEXT: [[COPY:%[0-9]+]]:_(p0) = COPY $x0
     ; CHECK-NEXT: G_STORE [[SMIN]](<4 x s32>), [[COPY]](p0) :: (store (<4 x s32>), align 32)
     ; CHECK-NEXT: [[C:%[0-9]+]]:_(s64) = G_CONSTANT i64 16
     ; CHECK-NEXT: [[PTR_ADD:%[0-9]+]]:_(p0) = G_PTR_ADD [[COPY]], [[C]](s64)
     ; CHECK-NEXT: G_STORE [[SMIN1]](<4 x s32>), [[PTR_ADD]](p0) :: (store (<4 x s32>) into unknown-address + 16)
     %vec:_(<8 x s32>) = G_IMPLICIT_DEF
     %vec1:_(<8 x s32>) = G_IMPLICIT_DEF
     %smin:_(<8 x s32>) = G_SMIN %vec, %vec1
bb.0:
     ; CHECK-NEXT: [[C:%[0-9]+]]:_(s64) = G_CONSTANT i64 -1
     ; CHECK-NEXT: [[BUILD_VECTOR:%[0-9]+]]:_(<2 x s64>) = G_BUILD_VECTOR [[C]](s64), [[C]](s64)
     ; CHECK-NEXT: [[XOR:%[0-9]+]]:_(<2 x s64>) = G_XOR [[SEXT_INREG]], [[BUILD_VECTOR]]
     ; CHECK-NEXT: [[AND:%[0-9]+]]:_(<2 x s64>) = G_AND [[DEF]], [[SEXT_INREG]]
     ; CHECK-NEXT: [[AND1:%[0-9]+]]:_(<2 x s64>) = G_AND [[DEF]], [[XOR]]
     ; CHECK-NEXT: [[OR:%[0-9]+]]:_(<2 x s64>) = G_OR [[AND]], [[AND1]]
     ; CHECK-NEXT: [[ICMP1:%[0-9]+]]:_(<2 x s64>) = G_ICMP intpred(slt), [[DEF]](<2 x s64>), [[DEF]]
     ; CHECK-NEXT: [[SEXT_INREG1:%[0-9]+]]:_(<2 x s64>) = G_SEXT_INREG [[ICMP1]], 1
-    ; CHECK-NEXT: [[BUILD_VECTOR1:%[0-9]+]]:_(<2 x s64>) = G_BUILD_VECTOR [[C]](s64), [[C]](s64)
-    ; CHECK-NEXT: [[XOR1:%[0-9]+]]:_(<2 x s64>) = G_XOR [[SEXT_INREG1]], [[BUILD_VECTOR1]]
+    ; CHECK-NEXT: [[XOR1:%[0-9]+]]:_(<2 x s64>) = G_XOR [[SEXT_INREG1]], [[BUILD_VECTOR]]
     ; CHECK-NEXT: [[AND2:%[0-9]+]]:_(<2 x s64>) = G_AND [[DEF]], [[SEXT_INREG1]]
     ; CHECK-NEXT: [[AND3:%[0-9]+]]:_(<2 x s64>) = G_AND [[DEF]], [[XOR1]]
     ; CHECK-NEXT: [[OR1:%[0-9]+]]:_(<2 x s64>) = G_OR [[AND2]], [[AND3]]
     ; CHECK-NEXT: [[COPY:%[0-9]+]]:_(p0) = COPY $x0
     ; CHECK-NEXT: G_STORE [[OR]](<2 x s64>), [[COPY]](p0) :: (store (<2 x s64>), align 32)
     ; CHECK-NEXT: [[C1:%[0-9]+]]:_(s64) = G_CONSTANT i64 16
     ; CHECK-NEXT: [[PTR_ADD:%[0-9]+]]:_(p0) = G_PTR_ADD [[COPY]], [[C1]](s64)
     ; CHECK-NEXT: G_STORE [[OR1]](<2 x s64>), [[PTR_ADD]](p0) :: (store (<2 x s64>) into unknown-address + 16)
body: |
   bb.0:
     liveins: $x0, $q0, $q1
 
     ; CHECK-LABEL: name: v32s8_umin
     ; CHECK: liveins: $x0, $q0, $q1
     ; CHECK-NEXT: {{  $}}
     ; CHECK-NEXT: [[DEF:%[0-9]+]]:_(s8) = G_IMPLICIT_DEF
     ; CHECK-NEXT: [[BUILD_VECTOR:%[0-9]+]]:_(<16 x s8>) = G_BUILD_VECTOR [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8)
-    ; CHECK-NEXT: [[BUILD_VECTOR1:%[0-9]+]]:_(<16 x s8>) = G_BUILD_VECTOR [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8)
-    ; CHECK-NEXT: [[BUILD_VECTOR2:%[0-9]+]]:_(<16 x s8>) = G_BUILD_VECTOR [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8)
-    ; CHECK-NEXT: [[BUILD_VECTOR3:%[0-9]+]]:_(<16 x s8>) = G_BUILD_VECTOR [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8)
-    ; CHECK-NEXT: [[UMIN:%[0-9]+]]:_(<16 x s8>) = G_UMIN [[BUILD_VECTOR]], [[BUILD_VECTOR2]]
-    ; CHECK-NEXT: [[UMIN1:%[0-9]+]]:_(<16 x s8>) = G_UMIN [[BUILD_VECTOR1]], [[BUILD_VECTOR3]]
+    ; CHECK-NEXT: [[UMIN:%[0-9]+]]:_(<16 x s8>) = G_UMIN [[BUILD_VECTOR]], [[BUILD_VECTOR]]
+    ; CHECK-NEXT: [[UMIN1:%[0-9]+]]:_(<16 x s8>) = G_UMIN [[BUILD_VECTOR]], [[BUILD_VECTOR]]
     ; CHECK-NEXT: [[COPY:%[0-9]+]]:_(p0) = COPY $x0
     ; CHECK-NEXT: G_STORE [[UMIN]](<16 x s8>), [[COPY]](p0) :: (store (<16 x s8>), align 32)
     ; CHECK-NEXT: [[C:%[0-9]+]]:_(s64) = G_CONSTANT i64 16
     ; CHECK-NEXT: [[PTR_ADD:%[0-9]+]]:_(p0) = G_PTR_ADD [[COPY]], [[C]](s64)
     ; CHECK-NEXT: G_STORE [[UMIN1]](<16 x s8>), [[PTR_ADD]](p0) :: (store (<16 x s8>) into unknown-address + 16)
     %vec:_(<32 x s8>) = G_IMPLICIT_DEF
     %vec1:_(<32 x s8>) = G_IMPLICIT_DEF
     %umin:_(<32 x s8>) = G_UMIN %vec, %vec1
body: |
   bb.0:
     liveins: $x0, $q0, $q1
 
     ; CHECK-LABEL: name: v16s16_umin
     ; CHECK: liveins: $x0, $q0, $q1
     ; CHECK-NEXT: {{  $}}
     ; CHECK-NEXT: [[DEF:%[0-9]+]]:_(s16) = G_IMPLICIT_DEF
     ; CHECK-NEXT: [[BUILD_VECTOR:%[0-9]+]]:_(<8 x s16>) = G_BUILD_VECTOR [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16)
-    ; CHECK-NEXT: [[BUILD_VECTOR1:%[0-9]+]]:_(<8 x s16>) = G_BUILD_VECTOR [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16)
-    ; CHECK-NEXT: [[BUILD_VECTOR2:%[0-9]+]]:_(<8 x s16>) = G_BUILD_VECTOR [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16)
-    ; CHECK-NEXT: [[BUILD_VECTOR3:%[0-9]+]]:_(<8 x s16>) = G_BUILD_VECTOR [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16)
-    ; CHECK-NEXT: [[UMIN:%[0-9]+]]:_(<8 x s16>) = G_UMIN [[BUILD_VECTOR]], [[BUILD_VECTOR2]]
-    ; CHECK-NEXT: [[UMIN1:%[0-9]+]]:_(<8 x s16>) = G_UMIN [[BUILD_VECTOR1]], [[BUILD_VECTOR3]]
+    ; CHECK-NEXT: [[UMIN:%[0-9]+]]:_(<8 x s16>) = G_UMIN [[BUILD_VECTOR]], [[BUILD_VECTOR]]
+    ; CHECK-NEXT: [[UMIN1:%[0-9]+]]:_(<8 x s16>) = G_UMIN [[BUILD_VECTOR]], [[BUILD_VECTOR]]
     ; CHECK-NEXT: [[COPY:%[0-9]+]]:_(p0) = COPY $x0
     ; CHECK-NEXT: G_STORE [[UMIN]](<8 x s16>), [[COPY]](p0) :: (store (<8 x s16>), align 32)
     ; CHECK-NEXT: [[C:%[0-9]+]]:_(s64) = G_CONSTANT i64 16
     ; CHECK-NEXT: [[PTR_ADD:%[0-9]+]]:_(p0) = G_PTR_ADD [[COPY]], [[C]](s64)
     ; CHECK-NEXT: G_STORE [[UMIN1]](<8 x s16>), [[PTR_ADD]](p0) :: (store (<8 x s16>) into unknown-address + 16)
     %vec:_(<16 x s16>) = G_IMPLICIT_DEF
     %vec1:_(<16 x s16>) = G_IMPLICIT_DEF
     %umin:_(<16 x s16>) = G_UMIN %vec, %vec1
body: |
   bb.0:
     liveins: $x0, $q0, $q1
 
     ; CHECK-LABEL: name: v8s32_umin
     ; CHECK: liveins: $x0, $q0, $q1
     ; CHECK-NEXT: {{  $}}
     ; CHECK-NEXT: [[DEF:%[0-9]+]]:_(s32) = G_IMPLICIT_DEF
     ; CHECK-NEXT: [[BUILD_VECTOR:%[0-9]+]]:_(<4 x s32>) = G_BUILD_VECTOR [[DEF]](s32), [[DEF]](s32), [[DEF]](s32), [[DEF]](s32)
-    ; CHECK-NEXT: [[BUILD_VECTOR1:%[0-9]+]]:_(<4 x s32>) = G_BUILD_VECTOR [[DEF]](s32), [[DEF]](s32), [[DEF]](s32), [[DEF]](s32)
-    ; CHECK-NEXT: [[BUILD_VECTOR2:%[0-9]+]]:_(<4 x s32>) = G_BUILD_VECTOR [[DEF]](s32), [[DEF]](s32), [[DEF]](s32), [[DEF]](s32)
-    ; CHECK-NEXT: [[BUILD_VECTOR3:%[0-9]+]]:_(<4 x s32>) = G_BUILD_VECTOR [[DEF]](s32), [[DEF]](s32), [[DEF]](s32), [[DEF]](s32)
-    ; CHECK-NEXT: [[UMIN:%[0-9]+]]:_(<4 x s32>) = G_UMIN [[BUILD_VECTOR]], [[BUILD_VECTOR2]]
-    ; CHECK-NEXT: [[UMIN1:%[0-9]+]]:_(<4 x s32>) = G_UMIN [[BUILD_VECTOR1]], [[BUILD_VECTOR3]]
+    ; CHECK-NEXT: [[UMIN:%[0-9]+]]:_(<4 x s32>) = G_UMIN [[BUILD_VECTOR]], [[BUILD_VECTOR]]
+    ; CHECK-NEXT: [[UMIN1:%[0-9]+]]:_(<4 x s32>) = G_UMIN [[BUILD_VECTOR]], [[BUILD_VECTOR]]
     ; CHECK-NEXT: [[COPY:%[0-9]+]]:_(p0) = COPY $x0
     ; CHECK-NEXT: G_STORE [[UMIN]](<4 x s32>), [[COPY]](p0) :: (store (<4 x s32>), align 32)
     ; CHECK-NEXT: [[C:%[0-9]+]]:_(s64) = G_CONSTANT i64 16
     ; CHECK-NEXT: [[PTR_ADD:%[0-9]+]]:_(p0) = G_PTR_ADD [[COPY]], [[C]](s64)
     ; CHECK-NEXT: G_STORE [[UMIN1]](<4 x s32>), [[PTR_ADD]](p0) :: (store (<4 x s32>) into unknown-address + 16)
     %vec:_(<8 x s32>) = G_IMPLICIT_DEF
     %vec1:_(<8 x s32>) = G_IMPLICIT_DEF
     %umin:_(<8 x s32>) = G_UMIN %vec, %vec1
bb.0:
     ; CHECK-NEXT: [[C:%[0-9]+]]:_(s64) = G_CONSTANT i64 -1
     ; CHECK-NEXT: [[BUILD_VECTOR:%[0-9]+]]:_(<2 x s64>) = G_BUILD_VECTOR [[C]](s64), [[C]](s64)
     ; CHECK-NEXT: [[XOR:%[0-9]+]]:_(<2 x s64>) = G_XOR [[SEXT_INREG]], [[BUILD_VECTOR]]
     ; CHECK-NEXT: [[AND:%[0-9]+]]:_(<2 x s64>) = G_AND [[DEF]], [[SEXT_INREG]]
     ; CHECK-NEXT: [[AND1:%[0-9]+]]:_(<2 x s64>) = G_AND [[DEF]], [[XOR]]
     ; CHECK-NEXT: [[OR:%[0-9]+]]:_(<2 x s64>) = G_OR [[AND]], [[AND1]]
     ; CHECK-NEXT: [[ICMP1:%[0-9]+]]:_(<2 x s64>) = G_ICMP intpred(ult), [[DEF]](<2 x s64>), [[DEF]]
     ; CHECK-NEXT: [[SEXT_INREG1:%[0-9]+]]:_(<2 x s64>) = G_SEXT_INREG [[ICMP1]], 1
-    ; CHECK-NEXT: [[BUILD_VECTOR1:%[0-9]+]]:_(<2 x s64>) = G_BUILD_VECTOR [[C]](s64), [[C]](s64)
-    ; CHECK-NEXT: [[XOR1:%[0-9]+]]:_(<2 x s64>) = G_XOR [[SEXT_INREG1]], [[BUILD_VECTOR1]]
+    ; CHECK-NEXT: [[XOR1:%[0-9]+]]:_(<2 x s64>) = G_XOR [[SEXT_INREG1]], [[BUILD_VECTOR]]
     ; CHECK-NEXT: [[AND2:%[0-9]+]]:_(<2 x s64>) = G_AND [[DEF]], [[SEXT_INREG1]]
     ; CHECK-NEXT: [[AND3:%[0-9]+]]:_(<2 x s64>) = G_AND [[DEF]], [[XOR1]]
     ; CHECK-NEXT: [[OR1:%[0-9]+]]:_(<2 x s64>) = G_OR [[AND2]], [[AND3]]
     ; CHECK-NEXT: [[COPY:%[0-9]+]]:_(p0) = COPY $x0
     ; CHECK-NEXT: G_STORE [[OR]](<2 x s64>), [[COPY]](p0) :: (store (<2 x s64>), align 32)
     ; CHECK-NEXT: [[C1:%[0-9]+]]:_(s64) = G_CONSTANT i64 16
     ; CHECK-NEXT: [[PTR_ADD:%[0-9]+]]:_(p0) = G_PTR_ADD [[COPY]], [[C1]](s64)
     ; CHECK-NEXT: G_STORE [[OR1]](<2 x s64>), [[PTR_ADD]](p0) :: (store (<2 x s64>) into unknown-address + 16)
body: |
   bb.0:
     liveins: $x0, $q0, $q1
 
     ; CHECK-LABEL: name: v32s8_smax
     ; CHECK: liveins: $x0, $q0, $q1
     ; CHECK-NEXT: {{  $}}
     ; CHECK-NEXT: [[DEF:%[0-9]+]]:_(s8) = G_IMPLICIT_DEF
     ; CHECK-NEXT: [[BUILD_VECTOR:%[0-9]+]]:_(<16 x s8>) = G_BUILD_VECTOR [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8)
-    ; CHECK-NEXT: [[BUILD_VECTOR1:%[0-9]+]]:_(<16 x s8>) = G_BUILD_VECTOR [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8)
-    ; CHECK-NEXT: [[BUILD_VECTOR2:%[0-9]+]]:_(<16 x s8>) = G_BUILD_VECTOR [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8)
-    ; CHECK-NEXT: [[BUILD_VECTOR3:%[0-9]+]]:_(<16 x s8>) = G_BUILD_VECTOR [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8)
-    ; CHECK-NEXT: [[SMAX:%[0-9]+]]:_(<16 x s8>) = G_SMAX [[BUILD_VECTOR]], [[BUILD_VECTOR2]]
-    ; CHECK-NEXT: [[SMAX1:%[0-9]+]]:_(<16 x s8>) = G_SMAX [[BUILD_VECTOR1]], [[BUILD_VECTOR3]]
+    ; CHECK-NEXT: [[SMAX:%[0-9]+]]:_(<16 x s8>) = G_SMAX [[BUILD_VECTOR]], [[BUILD_VECTOR]]
+    ; CHECK-NEXT: [[SMAX1:%[0-9]+]]:_(<16 x s8>) = G_SMAX [[BUILD_VECTOR]], [[BUILD_VECTOR]]
     ; CHECK-NEXT: [[COPY:%[0-9]+]]:_(p0) = COPY $x0
     ; CHECK-NEXT: G_STORE [[SMAX]](<16 x s8>), [[COPY]](p0) :: (store (<16 x s8>), align 32)
     ; CHECK-NEXT: [[C:%[0-9]+]]:_(s64) = G_CONSTANT i64 16
     ; CHECK-NEXT: [[PTR_ADD:%[0-9]+]]:_(p0) = G_PTR_ADD [[COPY]], [[C]](s64)
     ; CHECK-NEXT: G_STORE [[SMAX1]](<16 x s8>), [[PTR_ADD]](p0) :: (store (<16 x s8>) into unknown-address + 16)
     %vec:_(<32 x s8>) = G_IMPLICIT_DEF
     %vec1:_(<32 x s8>) = G_IMPLICIT_DEF
     %smax:_(<32 x s8>) = G_SMAX %vec, %vec1
body: |
   bb.0:
     liveins: $x0, $q0, $q1
 
     ; CHECK-LABEL: name: v16s16_smax
     ; CHECK: liveins: $x0, $q0, $q1
     ; CHECK-NEXT: {{  $}}
     ; CHECK-NEXT: [[DEF:%[0-9]+]]:_(s16) = G_IMPLICIT_DEF
     ; CHECK-NEXT: [[BUILD_VECTOR:%[0-9]+]]:_(<8 x s16>) = G_BUILD_VECTOR [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16)
-    ; CHECK-NEXT: [[BUILD_VECTOR1:%[0-9]+]]:_(<8 x s16>) = G_BUILD_VECTOR [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16)
-    ; CHECK-NEXT: [[BUILD_VECTOR2:%[0-9]+]]:_(<8 x s16>) = G_BUILD_VECTOR [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16)
-    ; CHECK-NEXT: [[BUILD_VECTOR3:%[0-9]+]]:_(<8 x s16>) = G_BUILD_VECTOR [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16)
-    ; CHECK-NEXT: [[SMAX:%[0-9]+]]:_(<8 x s16>) = G_SMAX [[BUILD_VECTOR]], [[BUILD_VECTOR2]]
-    ; CHECK-NEXT: [[SMAX1:%[0-9]+]]:_(<8 x s16>) = G_SMAX [[BUILD_VECTOR1]], [[BUILD_VECTOR3]]
+    ; CHECK-NEXT: [[SMAX:%[0-9]+]]:_(<8 x s16>) = G_SMAX [[BUILD_VECTOR]], [[BUILD_VECTOR]]
+    ; CHECK-NEXT: [[SMAX1:%[0-9]+]]:_(<8 x s16>) = G_SMAX [[BUILD_VECTOR]], [[BUILD_VECTOR]]
     ; CHECK-NEXT: [[COPY:%[0-9]+]]:_(p0) = COPY $x0
     ; CHECK-NEXT: G_STORE [[SMAX]](<8 x s16>), [[COPY]](p0) :: (store (<8 x s16>), align 32)
     ; CHECK-NEXT: [[C:%[0-9]+]]:_(s64) = G_CONSTANT i64 16
     ; CHECK-NEXT: [[PTR_ADD:%[0-9]+]]:_(p0) = G_PTR_ADD [[COPY]], [[C]](s64)
     ; CHECK-NEXT: G_STORE [[SMAX1]](<8 x s16>), [[PTR_ADD]](p0) :: (store (<8 x s16>) into unknown-address + 16)
     %vec:_(<16 x s16>) = G_IMPLICIT_DEF
     %vec1:_(<16 x s16>) = G_IMPLICIT_DEF
     %smax:_(<16 x s16>) = G_SMAX %vec, %vec1
body: |
   bb.0:
     liveins: $x0, $q0, $q1
 
     ; CHECK-LABEL: name: v8s32_smax
     ; CHECK: liveins: $x0, $q0, $q1
     ; CHECK-NEXT: {{  $}}
     ; CHECK-NEXT: [[DEF:%[0-9]+]]:_(s32) = G_IMPLICIT_DEF
     ; CHECK-NEXT: [[BUILD_VECTOR:%[0-9]+]]:_(<4 x s32>) = G_BUILD_VECTOR [[DEF]](s32), [[DEF]](s32), [[DEF]](s32), [[DEF]](s32)
-    ; CHECK-NEXT: [[BUILD_VECTOR1:%[0-9]+]]:_(<4 x s32>) = G_BUILD_VECTOR [[DEF]](s32), [[DEF]](s32), [[DEF]](s32), [[DEF]](s32)
-    ; CHECK-NEXT: [[BUILD_VECTOR2:%[0-9]+]]:_(<4 x s32>) = G_BUILD_VECTOR [[DEF]](s32), [[DEF]](s32), [[DEF]](s32), [[DEF]](s32)
-    ; CHECK-NEXT: [[BUILD_VECTOR3:%[0-9]+]]:_(<4 x s32>) = G_BUILD_VECTOR [[DEF]](s32), [[DEF]](s32), [[DEF]](s32), [[DEF]](s32)
-    ; CHECK-NEXT: [[SMAX:%[0-9]+]]:_(<4 x s32>) = G_SMAX [[BUILD_VECTOR]], [[BUILD_VECTOR2]]
-    ; CHECK-NEXT: [[SMAX1:%[0-9]+]]:_(<4 x s32>) = G_SMAX [[BUILD_VECTOR1]], [[BUILD_VECTOR3]]
+    ; CHECK-NEXT: [[SMAX:%[0-9]+]]:_(<4 x s32>) = G_SMAX [[BUILD_VECTOR]], [[BUILD_VECTOR]]
+    ; CHECK-NEXT: [[SMAX1:%[0-9]+]]:_(<4 x s32>) = G_SMAX [[BUILD_VECTOR]], [[BUILD_VECTOR]]
     ; CHECK-NEXT: [[COPY:%[0-9]+]]:_(p0) = COPY $x0
     ; CHECK-NEXT: G_STORE [[SMAX]](<4 x s32>), [[COPY]](p0) :: (store (<4 x s32>), align 32)
     ; CHECK-NEXT: [[C:%[0-9]+]]:_(s64) = G_CONSTANT i64 16
     ; CHECK-NEXT: [[PTR_ADD:%[0-9]+]]:_(p0) = G_PTR_ADD [[COPY]], [[C]](s64)
     ; CHECK-NEXT: G_STORE [[SMAX1]](<4 x s32>), [[PTR_ADD]](p0) :: (store (<4 x s32>) into unknown-address + 16)
     %vec:_(<8 x s32>) = G_IMPLICIT_DEF
     %vec1:_(<8 x s32>) = G_IMPLICIT_DEF
     %smax:_(<8 x s32>) = G_SMAX %vec, %vec1
bb.0:
     ; CHECK-NEXT: [[C:%[0-9]+]]:_(s64) = G_CONSTANT i64 -1
     ; CHECK-NEXT: [[BUILD_VECTOR:%[0-9]+]]:_(<2 x s64>) = G_BUILD_VECTOR [[C]](s64), [[C]](s64)
     ; CHECK-NEXT: [[XOR:%[0-9]+]]:_(<2 x s64>) = G_XOR [[SEXT_INREG]], [[BUILD_VECTOR]]
     ; CHECK-NEXT: [[AND:%[0-9]+]]:_(<2 x s64>) = G_AND [[DEF]], [[SEXT_INREG]]
     ; CHECK-NEXT: [[AND1:%[0-9]+]]:_(<2 x s64>) = G_AND [[DEF]], [[XOR]]
     ; CHECK-NEXT: [[OR:%[0-9]+]]:_(<2 x s64>) = G_OR [[AND]], [[AND1]]
     ; CHECK-NEXT: [[ICMP1:%[0-9]+]]:_(<2 x s64>) = G_ICMP intpred(sgt), [[DEF]](<2 x s64>), [[DEF]]
     ; CHECK-NEXT: [[SEXT_INREG1:%[0-9]+]]:_(<2 x s64>) = G_SEXT_INREG [[ICMP1]], 1
-    ; CHECK-NEXT: [[BUILD_VECTOR1:%[0-9]+]]:_(<2 x s64>) = G_BUILD_VECTOR [[C]](s64), [[C]](s64)
-    ; CHECK-NEXT: [[XOR1:%[0-9]+]]:_(<2 x s64>) = G_XOR [[SEXT_INREG1]], [[BUILD_VECTOR1]]
+    ; CHECK-NEXT: [[XOR1:%[0-9]+]]:_(<2 x s64>) = G_XOR [[SEXT_INREG1]], [[BUILD_VECTOR]]
     ; CHECK-NEXT: [[AND2:%[0-9]+]]:_(<2 x s64>) = G_AND [[DEF]], [[SEXT_INREG1]]
     ; CHECK-NEXT: [[AND3:%[0-9]+]]:_(<2 x s64>) = G_AND [[DEF]], [[XOR1]]
     ; CHECK-NEXT: [[OR1:%[0-9]+]]:_(<2 x s64>) = G_OR [[AND2]], [[AND3]]
     ; CHECK-NEXT: [[COPY:%[0-9]+]]:_(p0) = COPY $x0
     ; CHECK-NEXT: G_STORE [[OR]](<2 x s64>), [[COPY]](p0) :: (store (<2 x s64>), align 32)
     ; CHECK-NEXT: [[C1:%[0-9]+]]:_(s64) = G_CONSTANT i64 16
     ; CHECK-NEXT: [[PTR_ADD:%[0-9]+]]:_(p0) = G_PTR_ADD [[COPY]], [[C1]](s64)
     ; CHECK-NEXT: G_STORE [[OR1]](<2 x s64>), [[PTR_ADD]](p0) :: (store (<2 x s64>) into unknown-address + 16)
body: |
   bb.0:
     liveins: $x0, $q0, $q1
 
     ; CHECK-LABEL: name: v32s8_umax
     ; CHECK: liveins: $x0, $q0, $q1
     ; CHECK-NEXT: {{  $}}
     ; CHECK-NEXT: [[DEF:%[0-9]+]]:_(s8) = G_IMPLICIT_DEF
     ; CHECK-NEXT: [[BUILD_VECTOR:%[0-9]+]]:_(<16 x s8>) = G_BUILD_VECTOR [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8)
-    ; CHECK-NEXT: [[BUILD_VECTOR1:%[0-9]+]]:_(<16 x s8>) = G_BUILD_VECTOR [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8)
-    ; CHECK-NEXT: [[BUILD_VECTOR2:%[0-9]+]]:_(<16 x s8>) = G_BUILD_VECTOR [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8)
-    ; CHECK-NEXT: [[BUILD_VECTOR3:%[0-9]+]]:_(<16 x s8>) = G_BUILD_VECTOR [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8), [[DEF]](s8)
-    ; CHECK-NEXT: [[UMAX:%[0-9]+]]:_(<16 x s8>) = G_UMAX [[BUILD_VECTOR]], [[BUILD_VECTOR2]]
-    ; CHECK-NEXT: [[UMAX1:%[0-9]+]]:_(<16 x s8>) = G_UMAX [[BUILD_VECTOR1]], [[BUILD_VECTOR3]]
+    ; CHECK-NEXT: [[UMAX:%[0-9]+]]:_(<16 x s8>) = G_UMAX [[BUILD_VECTOR]], [[BUILD_VECTOR]]
+    ; CHECK-NEXT: [[UMAX1:%[0-9]+]]:_(<16 x s8>) = G_UMAX [[BUILD_VECTOR]], [[BUILD_VECTOR]]
     ; CHECK-NEXT: [[COPY:%[0-9]+]]:_(p0) = COPY $x0
     ; CHECK-NEXT: G_STORE [[UMAX]](<16 x s8>), [[COPY]](p0) :: (store (<16 x s8>), align 32)
     ; CHECK-NEXT: [[C:%[0-9]+]]:_(s64) = G_CONSTANT i64 16
     ; CHECK-NEXT: [[PTR_ADD:%[0-9]+]]:_(p0) = G_PTR_ADD [[COPY]], [[C]](s64)
     ; CHECK-NEXT: G_STORE [[UMAX1]](<16 x s8>), [[PTR_ADD]](p0) :: (store (<16 x s8>) into unknown-address + 16)
     %vec:_(<32 x s8>) = G_IMPLICIT_DEF
     %vec1:_(<32 x s8>) = G_IMPLICIT_DEF
     %umax:_(<32 x s8>) = G_UMAX %vec, %vec1
body: |
   bb.0:
     liveins: $x0, $q0, $q1
 
     ; CHECK-LABEL: name: v16s16_umax
     ; CHECK: liveins: $x0, $q0, $q1
     ; CHECK-NEXT: {{  $}}
     ; CHECK-NEXT: [[DEF:%[0-9]+]]:_(s16) = G_IMPLICIT_DEF
     ; CHECK-NEXT: [[BUILD_VECTOR:%[0-9]+]]:_(<8 x s16>) = G_BUILD_VECTOR [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16)
-    ; CHECK-NEXT: [[BUILD_VECTOR1:%[0-9]+]]:_(<8 x s16>) = G_BUILD_VECTOR [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16)
-    ; CHECK-NEXT: [[BUILD_VECTOR2:%[0-9]+]]:_(<8 x s16>) = G_BUILD_VECTOR [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16)
-    ; CHECK-NEXT: [[BUILD_VECTOR3:%[0-9]+]]:_(<8 x s16>) = G_BUILD_VECTOR [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16), [[DEF]](s16)
-    ; CHECK-NEXT: [[UMAX:%[0-9]+]]:_(<8 x s16>) = G_UMAX [[BUILD_VECTOR]], [[BUILD_VECTOR2]]
-    ; CHECK-NEXT: [[UMAX1:%[0-9]+]]:_(<8 x s16>) = G_UMAX [[BUILD_VECTOR1]], [[BUILD_VECTOR3]]
+    ; CHECK-NEXT: [[UMAX:%[0-9]+]]:_(<8 x s16>) = G_UMAX [[BUILD_VECTOR]], [[BUILD_VECTOR]]
+    ; CHECK-NEXT: [[UMAX1:%[0-9]+]]:_(<8 x s16>) = G_UMAX [[BUILD_VECTOR]], [[BUILD_VECTOR]]
     ; CHECK-NEXT: [[COPY:%[0-9]+]]:_(p0) = COPY $x0
     ; CHECK-NEXT: G_STORE [[UMAX]](<8 x s16>), [[COPY]](p0) :: (store (<8 x s16>), align 32)
     ; CHECK-NEXT: [[C:%[0-9]+]]:_(s64) = G_CONSTANT i64 16
     ; CHECK-NEXT: [[PTR_ADD:%[0-9]+]]:_(p0) = G_PTR_ADD [[COPY]], [[C]](s64)
     ; CHECK-NEXT: G_STORE [[UMAX1]](<8 x s16>), [[PTR_ADD]](p0) :: (store (<8 x s16>) into unknown-address + 16)
     %vec:_(<16 x s16>) = G_IMPLICIT_DEF
     %vec1:_(<16 x s16>) = G_IMPLICIT_DEF
     %umax:_(<16 x s16>) = G_UMAX %vec, %vec1
body: |
   bb.0:
     liveins: $x0, $q0, $q1
 
     ; CHECK-LABEL: name: v8s32_umax
     ; CHECK: liveins: $x0, $q0, $q1
     ; CHECK-NEXT: {{  $}}
     ; CHECK-NEXT: [[DEF:%[0-9]+]]:_(s32) = G_IMPLICIT_DEF
     ; CHECK-NEXT: [[BUILD_VECTOR:%[0-9]+]]:_(<4 x s32>) = G_BUILD_VECTOR [[DEF]](s32), [[DEF]](s32), [[DEF]](s32), [[DEF]](s32)
-    ; CHECK-NEXT: [[BUILD_VECTOR1:%[0-9]+]]:_(<4 x s32>) = G_BUILD_VECTOR [[DEF]](s32), [[DEF]](s32), [[DEF]](s32), [[DEF]](s32)
-    ; CHECK-NEXT: [[BUILD_VECTOR2:%[0-9]+]]:_(<4 x s32>) = G_BUILD_VECTOR [[DEF]](s32), [[DEF]](s32), [[DEF]](s32), [[DEF]](s32)
-    ; CHECK-NEXT: [[BUILD_VECTOR3:%[0-9]+]]:_(<4 x s32>) = G_BUILD_VECTOR [[DEF]](s32), [[DEF]](s32), [[DEF]](s32), [[DEF]](s32)
-    ; CHECK-NEXT: [[UMAX:%[0-9]+]]:_(<4 x s32>) = G_UMAX [[BUILD_VECTOR]], [[BUILD_VECTOR2]]
-    ; CHECK-NEXT: [[UMAX1:%[0-9]+]]:_(<4 x s32>) = G_UMAX [[BUILD_VECTOR1]], [[BUILD_VECTOR3]]
+    ; CHECK-NEXT: [[UMAX:%[0-9]+]]:_(<4 x s32>) = G_UMAX [[BUILD_VECTOR]], [[BUILD_VECTOR]]
+    ; CHECK-NEXT: [[UMAX1:%[0-9]+]]:_(<4 x s32>) = G_UMAX [[BUILD_VECTOR]], [[BUILD_VECTOR]]
     ; CHECK-NEXT: [[COPY:%[0-9]+]]:_(p0) = COPY $x0
     ; CHECK-NEXT: G_STORE [[UMAX]](<4 x s32>), [[COPY]](p0) :: (store (<4 x s32>), align 32)
     ; CHECK-NEXT: [[C:%[0-9]+]]:_(s64) = G_CONSTANT i64 16
     ; CHECK-NEXT: [[PTR_ADD:%[0-9]+]]:_(p0) = G_PTR_ADD [[COPY]], [[C]](s64)
     ; CHECK-NEXT: G_STORE [[UMAX1]](<4 x s32>), [[PTR_ADD]](p0) :: (store (<4 x s32>) into unknown-address + 16)
     %vec:_(<8 x s32>) = G_IMPLICIT_DEF
     %vec1:_(<8 x s32>) = G_IMPLICIT_DEF
     %umax:_(<8 x s32>) = G_UMAX %vec, %vec1
bb.0:
     ; CHECK-NEXT: [[C:%[0-9]+]]:_(s64) = G_CONSTANT i64 -1
     ; CHECK-NEXT: [[BUILD_VECTOR:%[0-9]+]]:_(<2 x s64>) = G_BUILD_VECTOR [[C]](s64), [[C]](s64)
     ; CHECK-NEXT: [[XOR:%[0-9]+]]:_(<2 x s64>) = G_XOR [[SEXT_INREG]], [[BUILD_VECTOR]]
     ; CHECK-NEXT: [[AND:%[0-9]+]]:_(<2 x s64>) = G_AND [[DEF]], [[SEXT_INREG]]
     ; CHECK-NEXT: [[AND1:%[0-9]+]]:_(<2 x s64>) = G_AND [[DEF]], [[XOR]]
     ; CHECK-NEXT: [[OR:%[0-9]+]]:_(<2 x s64>) = G_OR [[AND]], [[AND1]]
     ; CHECK-NEXT: [[ICMP1:%[0-9]+]]:_(<2 x s64>) = G_ICMP intpred(ugt), [[DEF]](<2 x s64>), [[DEF]]
     ; CHECK-NEXT: [[SEXT_INREG1:%[0-9]+]]:_(<2 x s64>) = G_SEXT_INREG [[ICMP1]], 1
-    ; CHECK-NEXT: [[BUILD_VECTOR1:%[0-9]+]]:_(<2 x s64>) = G_BUILD_VECTOR [[C]](s64), [[C]](s64)
-    ; CHECK-NEXT: [[XOR1:%[0-9]+]]:_(<2 x s64>) = G_XOR [[SEXT_INREG1]], [[BUILD_VECTOR1]]
+    ; CHECK-NEXT: [[XOR1:%[0-9]+]]:_(<2 x s64>) = G_XOR [[SEXT_INREG1]], [[BUILD_VECTOR]]
     ; CHECK-NEXT: [[AND2:%[0-9]+]]:_(<2 x s64>) = G_AND [[DEF]], [[SEXT_INREG1]]
     ; CHECK-NEXT: [[AND3:%[0-9]+]]:_(<2 x s64>) = G_AND [[DEF]], [[XOR1]]
     ; CHECK-NEXT: [[OR1:%[0-9]+]]:_(<2 x s64>) = G_OR [[AND2]], [[AND3]]
     ; CHECK-NEXT: [[COPY:%[0-9]+]]:_(p0) = COPY $x0
     ; CHECK-NEXT: G_STORE [[OR]](<2 x s64>), [[COPY]](p0) :: (store (<2 x s64>), align 32)
     ; CHECK-NEXT: [[C1:%[0-9]+]]:_(s64) = G_CONSTANT i64 16
     ; CHECK-NEXT: [[PTR_ADD:%[0-9]+]]:_(p0) = G_PTR_ADD [[COPY]], [[C1]](s64)
     ; CHECK-NEXT: G_STORE [[OR1]](<2 x s64>), [[PTR_ADD]](p0) :: (store (<2 x s64>) into unknown-address + 16)
     %vec:_(<4 x s64>) = G_IMPLICIT_DEF
     %vec1:_(<4 x s64>) = G_IMPLICIT_DEF
     %umax:_(<4 x s64>) = G_UMAX %vec, %vec1
     %1:_(p0) = COPY $x0
     G_STORE %umax(<4 x s64>), %1(p0) :: (store (<4 x s64>))
 
 ...
 

llvm/test/CodeGen/AArch64/GlobalISel/prelegalizer-combiner-mulo-zero.mir

 tracksRegLiveness: true
 body:             |
   bb.0:
     liveins: $q0, $x0
     ; CHECK-LABEL: name: umulo_vec_zero
     ; CHECK: liveins: $q0, $x0
     ; CHECK-NEXT: {{  $}}
     ; CHECK-NEXT: %zero:_(s64) = G_CONSTANT i64 0
-    ; CHECK-NEXT: %mulo:_(<2 x s64>) = G_BUILD_VECTOR %zero(s64), %zero(s64)
+    ; CHECK-NEXT: %zero_vec:_(<2 x s64>) = G_BUILD_VECTOR %zero(s64), %zero(s64)
+    ; CHECK-NEXT: %mulo:_(<2 x s64>) = COPY %zero_vec(<2 x s64>)
     ; CHECK-NEXT: [[C:%[0-9]+]]:_(s1) = G_CONSTANT i1 false
     ; CHECK-NEXT: %carry:_(<2 x s1>) = G_BUILD_VECTOR [[C]](s1), [[C]](s1)
     ; CHECK-NEXT: %carry_elt_0:_(s1) = G_EXTRACT_VECTOR_ELT %carry(<2 x s1>), %zero(s64)
     ; CHECK-NEXT: %carry_wide:_(s64) = G_ZEXT %carry_elt_0(s1)
     ; CHECK-NEXT: $q0 = COPY %mulo(<2 x s64>)
     ; CHECK-NEXT: $x0 = COPY %carry_wide(s64)
     ; CHECK-NEXT: RET_ReallyLR implicit $q0
     %lhs:_(<2 x s64>) = COPY $q0

 tracksRegLiveness: true
 body:             |
   bb.0:
     liveins: $q0, $x0
     ; CHECK-LABEL: name: smulo_vec_zero
     ; CHECK: liveins: $q0, $x0
     ; CHECK-NEXT: {{  $}}
     ; CHECK-NEXT: %zero:_(s64) = G_CONSTANT i64 0
-    ; CHECK-NEXT: %mulo:_(<2 x s64>) = G_BUILD_VECTOR %zero(s64), %zero(s64)
+    ; CHECK-NEXT: %zero_vec:_(<2 x s64>) = G_BUILD_VECTOR %zero(s64), %zero(s64)
+    ; CHECK-NEXT: %mulo:_(<2 x s64>) = COPY %zero_vec(<2 x s64>)
     ; CHECK-NEXT: [[C:%[0-9]+]]:_(s1) = G_CONSTANT i1 false
     ; CHECK-NEXT: %carry:_(<2 x s1>) = G_BUILD_VECTOR [[C]](s1), [[C]](s1)
     ; CHECK-NEXT: %carry_elt_0:_(s1) = G_EXTRACT_VECTOR_ELT %carry(<2 x s1>), %zero(s64)
     ; CHECK-NEXT: %carry_wide:_(s64) = G_ZEXT %carry_elt_0(s1)
     ; CHECK-NEXT: $q0 = COPY %mulo(<2 x s64>)
     ; CHECK-NEXT: $x0 = COPY %carry_wide(s64)
     ; CHECK-NEXT: RET_ReallyLR implicit $q0
     %lhs:_(<2 x s64>) = COPY $q0
     %zero:_(s64) = G_CONSTANT i64 0
     %zero_vec:_(<2 x s64>) = G_BUILD_VECTOR %zero, %zero
     %mulo:_(<2 x s64>), %carry:_(<2 x s1>) = G_SMULO %lhs, %zero_vec
     %carry_elt_0:_(s1) = G_EXTRACT_VECTOR_ELT %carry:_(<2 x s1>), %zero:_(s64)
     %carry_wide:_(s64) = G_ZEXT %carry_elt_0
     $q0 = COPY %mulo(<2 x s64>)
     $x0 = COPY %carry_wide
     RET_ReallyLR implicit $q0

llvm/test/CodeGen/AMDGPU/GlobalISel/legalize-build-vector-splat.mir

+# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
+# RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx1100 -run-pass=legalizer %s -o - | FileCheck %s
+
+# Make sure we CSE when building a vector splat.
+---
+name: build_vector_v8s16_splat
+body: |
+  bb.0:
+    liveins: $vgpr0, $vgpr1
+    ; CHECK-LABEL: name: build_vector_v8s16_splat
+    ; CHECK: liveins: $vgpr0, $vgpr1
+    ; CHECK-NEXT: {{  $}}
+    ; CHECK-NEXT: [[C:%[0-9]+]]:_(s16) = G_CONSTANT i16 16256
+    ; CHECK-NEXT: [[BUILD_VECTOR:%[0-9]+]]:_(<2 x s16>) = G_BUILD_VECTOR [[C]](s16), [[C]](s16)
+    ; CHECK-NEXT: [[CONCAT_VECTORS:%[0-9]+]]:_(<8 x s16>) = G_CONCAT_VECTORS [[BUILD_VECTOR]](<2 x s16>), [[BUILD_VECTOR]](<2 x s16>), [[BUILD_VECTOR]](<2 x s16>), [[BUILD_VECTOR]](<2 x s16>)
+    ; CHECK-NEXT: S_NOP 0, implicit [[CONCAT_VECTORS]](<8 x s16>)
+    %1:_(s32) = COPY $vgpr0
+    %2:_(s32) = COPY $vgpr1
+    %0:_(p1) = G_MERGE_VALUES %1(s32), %2(s32)
+    %4:_(s16) = G_CONSTANT i16 16256
+    %3:_(<8 x s16>) = G_BUILD_VECTOR %4(s16), %4(s16), %4(s16), %4(s16), %4(s16), %4(s16), %4(s16), %4(s16)
+    S_NOP 0, implicit %3
+...

llvm/unittests/CodeGen/GlobalISel/CSETest.cpp

TEST_F(AArch64GISelMITest, TestCSE) {
   EXPECT_EQ(FSplat.getReg(1), FSplat.getReg(2));
   EXPECT_EQ(&*MIBFP0, MRI->getVRegDef(FSplat.getReg(1)));
 
   // Check G_UNMERGE_VALUES
   auto MIBUnmerge = CSEB.buildUnmerge({s32, s32}, Copies[0]);
   auto MIBUnmerge2 = CSEB.buildUnmerge({s32, s32}, Copies[0]);
   EXPECT_TRUE(&*MIBUnmerge == &*MIBUnmerge2);
 
+  // Check G_BUILD_VECTOR
+  Register Reg1 = MRI->createGenericVirtualRegister(s32);
+  Register Reg2 = MRI->createGenericVirtualRegister(s32);
+  auto BuildVec1 =
+      CSEB.buildBuildVector(LLT::fixed_vector(4, 32), {Reg1, Reg2, Reg1, Reg2});
+  auto BuildVec2 =
+      CSEB.buildBuildVector(LLT::fixed_vector(4, 32), {Reg1, Reg2, Reg1, Reg2});
+  EXPECT_EQ(TargetOpcode::G_BUILD_VECTOR, BuildVec1->getOpcode());
+  EXPECT_EQ(TargetOpcode::G_BUILD_VECTOR, BuildVec2->getOpcode());
+  EXPECT_TRUE(&*BuildVec1 == &*BuildVec2);
+
+  // Check G_BUILD_VECTOR_TRUNC
+  auto BuildVecTrunc1 = CSEB.buildBuildVectorTrunc(LLT::fixed_vector(4, 16),
+                                                   {Reg1, Reg2, Reg1, Reg2});
+  auto BuildVecTrunc2 = CSEB.buildBuildVectorTrunc(LLT::fixed_vector(4, 16),
+                                                   {Reg1, Reg2, Reg1, Reg2});
+  EXPECT_EQ(TargetOpcode::G_BUILD_VECTOR_TRUNC, BuildVecTrunc1->getOpcode());
+  EXPECT_EQ(TargetOpcode::G_BUILD_VECTOR_TRUNC, BuildVecTrunc2->getOpcode());
+  EXPECT_TRUE(&*BuildVecTrunc1 == &*BuildVecTrunc2);
+
   // Check G_IMPLICIT_DEF
   auto Undef0 = CSEB.buildUndef(s32);
   auto Undef1 = CSEB.buildUndef(s32);
   EXPECT_EQ(&*Undef0, &*Undef1);
 
   // If the observer is installed to the MF, CSE can also
   // track new instructions built without the CSEBuilder and
   // the newly built instructions are available for CSEing next