[llvm] r318323 - [InstCombine] trunc (binop X, C) --> binop (trunc X, C')
Chandler Carruth via llvm-commits
llvm-commits at lists.llvm.org
Thu Dec 7 11:48:15 PST 2017
FYI, we've root caused an compile timeout to this revision. It seems quite
likely this is fighting another instcombine.
We're still working on a test case, but wanted to go ahead and give a
heads-up in case you can spot the place where we reverse this transform.
On Wed, Nov 15, 2017 at 8:12 PM Sanjay Patel via llvm-commits <
llvm-commits at lists.llvm.org> wrote:
> Author: spatel
> Date: Wed Nov 15 11:12:01 2017
> New Revision: 318323
>
> URL: http://llvm.org/viewvc/llvm-project?rev=318323&view=rev
> Log:
> [InstCombine] trunc (binop X, C) --> binop (trunc X, C')
>
> Note that one-use and shouldChangeType() are checked ahead of the switch.
>
> Without the narrowing folds, we can produce inferior vector code as shown
> in PR35299:
> https://bugs.llvm.org/show_bug.cgi?id=35299
>
>
> Modified:
> llvm/trunk/lib/Transforms/InstCombine/InstCombineCasts.cpp
> llvm/trunk/test/Transforms/InstCombine/pr33765.ll
> llvm/trunk/test/Transforms/InstCombine/trunc-binop-ext.ll
>
> Modified: llvm/trunk/lib/Transforms/InstCombine/InstCombineCasts.cpp
> URL:
> http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/InstCombine/InstCombineCasts.cpp?rev=318323&r1=318322&r2=318323&view=diff
>
> ==============================================================================
> --- llvm/trunk/lib/Transforms/InstCombine/InstCombineCasts.cpp (original)
> +++ llvm/trunk/lib/Transforms/InstCombine/InstCombineCasts.cpp Wed Nov 15
> 11:12:01 2017
> @@ -545,6 +545,8 @@ Instruction *InstCombiner::narrowBinOp(T
> if (!match(Trunc.getOperand(0), m_OneUse(m_BinOp(BinOp))))
> return nullptr;
>
> + Value *BinOp0 = BinOp->getOperand(0);
> + Value *BinOp1 = BinOp->getOperand(1);
> switch (BinOp->getOpcode()) {
> case Instruction::And:
> case Instruction::Or:
> @@ -552,20 +554,31 @@ Instruction *InstCombiner::narrowBinOp(T
> case Instruction::Add:
> case Instruction::Mul: {
> Constant *C;
> - if (match(BinOp->getOperand(1), m_Constant(C))) {
> + if (match(BinOp1, m_Constant(C))) {
> // trunc (binop X, C) --> binop (trunc X, C')
> Constant *NarrowC = ConstantExpr::getTrunc(C, DestTy);
> - Value *TruncX = Builder.CreateTrunc(BinOp->getOperand(0), DestTy);
> + Value *TruncX = Builder.CreateTrunc(BinOp0, DestTy);
> return BinaryOperator::Create(BinOp->getOpcode(), TruncX, NarrowC);
> }
> + Value *X;
> + if (match(BinOp0, m_ZExtOrSExt(m_Value(X))) && X->getType() ==
> DestTy) {
> + // trunc (binop (ext X), Y) --> binop X, (trunc Y)
> + Value *NarrowOp1 = Builder.CreateTrunc(BinOp1, DestTy);
> + return BinaryOperator::Create(BinOp->getOpcode(), X, NarrowOp1);
> + }
> + if (match(BinOp1, m_ZExtOrSExt(m_Value(X))) && X->getType() ==
> DestTy) {
> + // trunc (binop Y, (ext X)) --> binop (trunc Y), X
> + Value *NarrowOp0 = Builder.CreateTrunc(BinOp0, DestTy);
> + return BinaryOperator::Create(BinOp->getOpcode(), NarrowOp0, X);
> + }
> break;
> }
> case Instruction::Sub: {
> Constant *C;
> - if (match(BinOp->getOperand(0), m_Constant(C))) {
> + if (match(BinOp0, m_Constant(C))) {
> // trunc (binop C, X) --> binop (trunc C', X)
> Constant *NarrowC = ConstantExpr::getTrunc(C, DestTy);
> - Value *TruncX = Builder.CreateTrunc(BinOp->getOperand(1), DestTy);
> + Value *TruncX = Builder.CreateTrunc(BinOp1, DestTy);
> return BinaryOperator::Create(BinOp->getOpcode(), NarrowC, TruncX);
> }
> break;
>
> Modified: llvm/trunk/test/Transforms/InstCombine/pr33765.ll
> URL:
> http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/InstCombine/pr33765.ll?rev=318323&r1=318322&r2=318323&view=diff
>
> ==============================================================================
> --- llvm/trunk/test/Transforms/InstCombine/pr33765.ll (original)
> +++ llvm/trunk/test/Transforms/InstCombine/pr33765.ll Wed Nov 15 11:12:01
> 2017
> @@ -10,9 +10,8 @@ define void @patatino(i8 %beth) {
> ; CHECK: if.then9:
> ; CHECK-NEXT: [[MUL:%.*]] = mul nuw nsw i32 [[CONV]], [[CONV]]
> ; CHECK-NEXT: [[TINKY:%.*]] = load i16, i16* @glob, align 2
> -; CHECK-NEXT: [[CONV131:%.*]] = zext i16 [[TINKY]] to i32
> -; CHECK-NEXT: [[AND:%.*]] = and i32 [[MUL]], [[CONV131]]
> -; CHECK-NEXT: [[CONV14:%.*]] = trunc i32 [[AND]] to i16
> +; CHECK-NEXT: [[TMP1:%.*]] = trunc i32 [[MUL]] to i16
> +; CHECK-NEXT: [[CONV14:%.*]] = and i16 [[TINKY]], [[TMP1]]
> ; CHECK-NEXT: store i16 [[CONV14]], i16* @glob, align 2
> ; CHECK-NEXT: ret void
> ;
>
> Modified: llvm/trunk/test/Transforms/InstCombine/trunc-binop-ext.ll
> URL:
> http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/InstCombine/trunc-binop-ext.ll?rev=318323&r1=318322&r2=318323&view=diff
>
> ==============================================================================
> --- llvm/trunk/test/Transforms/InstCombine/trunc-binop-ext.ll (original)
> +++ llvm/trunk/test/Transforms/InstCombine/trunc-binop-ext.ll Wed Nov 15
> 11:12:01 2017
> @@ -2,9 +2,8 @@
>
> define i16 @narrow_sext_and(i16 %x16, i32 %y32) {
> ; CHECK-LABEL: @narrow_sext_and(
> -; CHECK-NEXT: [[X321:%.*]] = zext i16 %x16 to i32
> -; CHECK-NEXT: [[B:%.*]] = and i32 [[X321]], %y32
> -; CHECK-NEXT: [[R:%.*]] = trunc i32 [[B]] to i16
> +; CHECK-NEXT: [[TMP1:%.*]] = trunc i32 %y32 to i16
> +; CHECK-NEXT: [[R:%.*]] = and i16 [[TMP1]], %x16
> ; CHECK-NEXT: ret i16 [[R]]
> ;
> %x32 = sext i16 %x16 to i32
> @@ -15,9 +14,8 @@ define i16 @narrow_sext_and(i16 %x16, i3
>
> define i16 @narrow_zext_and(i16 %x16, i32 %y32) {
> ; CHECK-LABEL: @narrow_zext_and(
> -; CHECK-NEXT: [[X32:%.*]] = zext i16 %x16 to i32
> -; CHECK-NEXT: [[B:%.*]] = and i32 [[X32]], %y32
> -; CHECK-NEXT: [[R:%.*]] = trunc i32 [[B]] to i16
> +; CHECK-NEXT: [[TMP1:%.*]] = trunc i32 %y32 to i16
> +; CHECK-NEXT: [[R:%.*]] = and i16 [[TMP1]], %x16
> ; CHECK-NEXT: ret i16 [[R]]
> ;
> %x32 = zext i16 %x16 to i32
> @@ -28,9 +26,8 @@ define i16 @narrow_zext_and(i16 %x16, i3
>
> define i16 @narrow_sext_or(i16 %x16, i32 %y32) {
> ; CHECK-LABEL: @narrow_sext_or(
> -; CHECK-NEXT: [[X321:%.*]] = zext i16 %x16 to i32
> -; CHECK-NEXT: [[B:%.*]] = or i32 [[X321]], %y32
> -; CHECK-NEXT: [[R:%.*]] = trunc i32 [[B]] to i16
> +; CHECK-NEXT: [[TMP1:%.*]] = trunc i32 %y32 to i16
> +; CHECK-NEXT: [[R:%.*]] = or i16 [[TMP1]], %x16
> ; CHECK-NEXT: ret i16 [[R]]
> ;
> %x32 = sext i16 %x16 to i32
> @@ -41,9 +38,8 @@ define i16 @narrow_sext_or(i16 %x16, i32
>
> define i16 @narrow_zext_or(i16 %x16, i32 %y32) {
> ; CHECK-LABEL: @narrow_zext_or(
> -; CHECK-NEXT: [[X32:%.*]] = zext i16 %x16 to i32
> -; CHECK-NEXT: [[B:%.*]] = or i32 [[X32]], %y32
> -; CHECK-NEXT: [[R:%.*]] = trunc i32 [[B]] to i16
> +; CHECK-NEXT: [[TMP1:%.*]] = trunc i32 %y32 to i16
> +; CHECK-NEXT: [[R:%.*]] = or i16 [[TMP1]], %x16
> ; CHECK-NEXT: ret i16 [[R]]
> ;
> %x32 = zext i16 %x16 to i32
> @@ -54,9 +50,8 @@ define i16 @narrow_zext_or(i16 %x16, i32
>
> define i16 @narrow_sext_xor(i16 %x16, i32 %y32) {
> ; CHECK-LABEL: @narrow_sext_xor(
> -; CHECK-NEXT: [[X321:%.*]] = zext i16 %x16 to i32
> -; CHECK-NEXT: [[B:%.*]] = xor i32 [[X321]], %y32
> -; CHECK-NEXT: [[R:%.*]] = trunc i32 [[B]] to i16
> +; CHECK-NEXT: [[TMP1:%.*]] = trunc i32 %y32 to i16
> +; CHECK-NEXT: [[R:%.*]] = xor i16 [[TMP1]], %x16
> ; CHECK-NEXT: ret i16 [[R]]
> ;
> %x32 = sext i16 %x16 to i32
> @@ -67,9 +62,8 @@ define i16 @narrow_sext_xor(i16 %x16, i3
>
> define i16 @narrow_zext_xor(i16 %x16, i32 %y32) {
> ; CHECK-LABEL: @narrow_zext_xor(
> -; CHECK-NEXT: [[X32:%.*]] = zext i16 %x16 to i32
> -; CHECK-NEXT: [[B:%.*]] = xor i32 [[X32]], %y32
> -; CHECK-NEXT: [[R:%.*]] = trunc i32 [[B]] to i16
> +; CHECK-NEXT: [[TMP1:%.*]] = trunc i32 %y32 to i16
> +; CHECK-NEXT: [[R:%.*]] = xor i16 [[TMP1]], %x16
> ; CHECK-NEXT: ret i16 [[R]]
> ;
> %x32 = zext i16 %x16 to i32
> @@ -80,9 +74,8 @@ define i16 @narrow_zext_xor(i16 %x16, i3
>
> define i16 @narrow_sext_add(i16 %x16, i32 %y32) {
> ; CHECK-LABEL: @narrow_sext_add(
> -; CHECK-NEXT: [[X321:%.*]] = zext i16 %x16 to i32
> -; CHECK-NEXT: [[B:%.*]] = add i32 [[X321]], %y32
> -; CHECK-NEXT: [[R:%.*]] = trunc i32 [[B]] to i16
> +; CHECK-NEXT: [[TMP1:%.*]] = trunc i32 %y32 to i16
> +; CHECK-NEXT: [[R:%.*]] = add i16 [[TMP1]], %x16
> ; CHECK-NEXT: ret i16 [[R]]
> ;
> %x32 = sext i16 %x16 to i32
> @@ -93,9 +86,8 @@ define i16 @narrow_sext_add(i16 %x16, i3
>
> define i16 @narrow_zext_add(i16 %x16, i32 %y32) {
> ; CHECK-LABEL: @narrow_zext_add(
> -; CHECK-NEXT: [[X32:%.*]] = zext i16 %x16 to i32
> -; CHECK-NEXT: [[B:%.*]] = add i32 [[X32]], %y32
> -; CHECK-NEXT: [[R:%.*]] = trunc i32 [[B]] to i16
> +; CHECK-NEXT: [[TMP1:%.*]] = trunc i32 %y32 to i16
> +; CHECK-NEXT: [[R:%.*]] = add i16 [[TMP1]], %x16
> ; CHECK-NEXT: ret i16 [[R]]
> ;
> %x32 = zext i16 %x16 to i32
> @@ -106,9 +98,8 @@ define i16 @narrow_zext_add(i16 %x16, i3
>
> define i16 @narrow_sext_mul(i16 %x16, i32 %y32) {
> ; CHECK-LABEL: @narrow_sext_mul(
> -; CHECK-NEXT: [[X32:%.*]] = sext i16 %x16 to i32
> -; CHECK-NEXT: [[B:%.*]] = mul i32 [[X32]], %y32
> -; CHECK-NEXT: [[R:%.*]] = trunc i32 [[B]] to i16
> +; CHECK-NEXT: [[TMP1:%.*]] = trunc i32 %y32 to i16
> +; CHECK-NEXT: [[R:%.*]] = mul i16 [[TMP1]], %x16
> ; CHECK-NEXT: ret i16 [[R]]
> ;
> %x32 = sext i16 %x16 to i32
> @@ -119,9 +110,8 @@ define i16 @narrow_sext_mul(i16 %x16, i3
>
> define i16 @narrow_zext_mul(i16 %x16, i32 %y32) {
> ; CHECK-LABEL: @narrow_zext_mul(
> -; CHECK-NEXT: [[X32:%.*]] = zext i16 %x16 to i32
> -; CHECK-NEXT: [[B:%.*]] = mul i32 [[X32]], %y32
> -; CHECK-NEXT: [[R:%.*]] = trunc i32 [[B]] to i16
> +; CHECK-NEXT: [[TMP1:%.*]] = trunc i32 %y32 to i16
> +; CHECK-NEXT: [[R:%.*]] = mul i16 [[TMP1]], %x16
> ; CHECK-NEXT: ret i16 [[R]]
> ;
> %x32 = zext i16 %x16 to i32
> @@ -130,15 +120,14 @@ define i16 @narrow_zext_mul(i16 %x16, i3
> ret i16 %r
> }
>
> -; Verify that the commuted patterns work. The div is to ensure that
> complexity-based
> +; Verify that the commuted patterns work. The div is to ensure that
> complexity-based
> ; canonicalization doesn't swap the binop operands. Use vector types to
> show those work too.
>
> define <2 x i16> @narrow_sext_and_commute(<2 x i16> %x16, <2 x i32> %y32)
> {
> ; CHECK-LABEL: @narrow_sext_and_commute(
> ; CHECK-NEXT: [[Y32OP0:%.*]] = sdiv <2 x i32> %y32, <i32 7, i32 -17>
> -; CHECK-NEXT: [[X321:%.*]] = zext <2 x i16> %x16 to <2 x i32>
> -; CHECK-NEXT: [[B:%.*]] = and <2 x i32> [[Y32OP0]], [[X321]]
> -; CHECK-NEXT: [[R:%.*]] = trunc <2 x i32> [[B]] to <2 x i16>
> +; CHECK-NEXT: [[TMP1:%.*]] = trunc <2 x i32> [[Y32OP0]] to <2 x i16>
> +; CHECK-NEXT: [[R:%.*]] = and <2 x i16> [[TMP1]], %x16
> ; CHECK-NEXT: ret <2 x i16> [[R]]
> ;
> %y32op0 = sdiv <2 x i32> %y32, <i32 7, i32 -17>
> @@ -151,9 +140,8 @@ define <2 x i16> @narrow_sext_and_commut
> define <2 x i16> @narrow_zext_and_commute(<2 x i16> %x16, <2 x i32> %y32)
> {
> ; CHECK-LABEL: @narrow_zext_and_commute(
> ; CHECK-NEXT: [[Y32OP0:%.*]] = sdiv <2 x i32> %y32, <i32 7, i32 -17>
> -; CHECK-NEXT: [[X32:%.*]] = zext <2 x i16> %x16 to <2 x i32>
> -; CHECK-NEXT: [[B:%.*]] = and <2 x i32> [[Y32OP0]], [[X32]]
> -; CHECK-NEXT: [[R:%.*]] = trunc <2 x i32> [[B]] to <2 x i16>
> +; CHECK-NEXT: [[TMP1:%.*]] = trunc <2 x i32> [[Y32OP0]] to <2 x i16>
> +; CHECK-NEXT: [[R:%.*]] = and <2 x i16> [[TMP1]], %x16
> ; CHECK-NEXT: ret <2 x i16> [[R]]
> ;
> %y32op0 = sdiv <2 x i32> %y32, <i32 7, i32 -17>
> @@ -166,9 +154,8 @@ define <2 x i16> @narrow_zext_and_commut
> define <2 x i16> @narrow_sext_or_commute(<2 x i16> %x16, <2 x i32> %y32) {
> ; CHECK-LABEL: @narrow_sext_or_commute(
> ; CHECK-NEXT: [[Y32OP0:%.*]] = sdiv <2 x i32> %y32, <i32 7, i32 -17>
> -; CHECK-NEXT: [[X321:%.*]] = zext <2 x i16> %x16 to <2 x i32>
> -; CHECK-NEXT: [[B:%.*]] = or <2 x i32> [[Y32OP0]], [[X321]]
> -; CHECK-NEXT: [[R:%.*]] = trunc <2 x i32> [[B]] to <2 x i16>
> +; CHECK-NEXT: [[TMP1:%.*]] = trunc <2 x i32> [[Y32OP0]] to <2 x i16>
> +; CHECK-NEXT: [[R:%.*]] = or <2 x i16> [[TMP1]], %x16
> ; CHECK-NEXT: ret <2 x i16> [[R]]
> ;
> %y32op0 = sdiv <2 x i32> %y32, <i32 7, i32 -17>
> @@ -181,9 +168,8 @@ define <2 x i16> @narrow_sext_or_commute
> define <2 x i16> @narrow_zext_or_commute(<2 x i16> %x16, <2 x i32> %y32) {
> ; CHECK-LABEL: @narrow_zext_or_commute(
> ; CHECK-NEXT: [[Y32OP0:%.*]] = sdiv <2 x i32> %y32, <i32 7, i32 -17>
> -; CHECK-NEXT: [[X32:%.*]] = zext <2 x i16> %x16 to <2 x i32>
> -; CHECK-NEXT: [[B:%.*]] = or <2 x i32> [[Y32OP0]], [[X32]]
> -; CHECK-NEXT: [[R:%.*]] = trunc <2 x i32> [[B]] to <2 x i16>
> +; CHECK-NEXT: [[TMP1:%.*]] = trunc <2 x i32> [[Y32OP0]] to <2 x i16>
> +; CHECK-NEXT: [[R:%.*]] = or <2 x i16> [[TMP1]], %x16
> ; CHECK-NEXT: ret <2 x i16> [[R]]
> ;
> %y32op0 = sdiv <2 x i32> %y32, <i32 7, i32 -17>
> @@ -196,9 +182,8 @@ define <2 x i16> @narrow_zext_or_commute
> define <2 x i16> @narrow_sext_xor_commute(<2 x i16> %x16, <2 x i32> %y32)
> {
> ; CHECK-LABEL: @narrow_sext_xor_commute(
> ; CHECK-NEXT: [[Y32OP0:%.*]] = sdiv <2 x i32> %y32, <i32 7, i32 -17>
> -; CHECK-NEXT: [[X321:%.*]] = zext <2 x i16> %x16 to <2 x i32>
> -; CHECK-NEXT: [[B:%.*]] = xor <2 x i32> [[Y32OP0]], [[X321]]
> -; CHECK-NEXT: [[R:%.*]] = trunc <2 x i32> [[B]] to <2 x i16>
> +; CHECK-NEXT: [[TMP1:%.*]] = trunc <2 x i32> [[Y32OP0]] to <2 x i16>
> +; CHECK-NEXT: [[R:%.*]] = xor <2 x i16> [[TMP1]], %x16
> ; CHECK-NEXT: ret <2 x i16> [[R]]
> ;
> %y32op0 = sdiv <2 x i32> %y32, <i32 7, i32 -17>
> @@ -211,9 +196,8 @@ define <2 x i16> @narrow_sext_xor_commut
> define <2 x i16> @narrow_zext_xor_commute(<2 x i16> %x16, <2 x i32> %y32)
> {
> ; CHECK-LABEL: @narrow_zext_xor_commute(
> ; CHECK-NEXT: [[Y32OP0:%.*]] = sdiv <2 x i32> %y32, <i32 7, i32 -17>
> -; CHECK-NEXT: [[X32:%.*]] = zext <2 x i16> %x16 to <2 x i32>
> -; CHECK-NEXT: [[B:%.*]] = xor <2 x i32> [[Y32OP0]], [[X32]]
> -; CHECK-NEXT: [[R:%.*]] = trunc <2 x i32> [[B]] to <2 x i16>
> +; CHECK-NEXT: [[TMP1:%.*]] = trunc <2 x i32> [[Y32OP0]] to <2 x i16>
> +; CHECK-NEXT: [[R:%.*]] = xor <2 x i16> [[TMP1]], %x16
> ; CHECK-NEXT: ret <2 x i16> [[R]]
> ;
> %y32op0 = sdiv <2 x i32> %y32, <i32 7, i32 -17>
> @@ -226,9 +210,8 @@ define <2 x i16> @narrow_zext_xor_commut
> define <2 x i16> @narrow_sext_add_commute(<2 x i16> %x16, <2 x i32> %y32)
> {
> ; CHECK-LABEL: @narrow_sext_add_commute(
> ; CHECK-NEXT: [[Y32OP0:%.*]] = sdiv <2 x i32> %y32, <i32 7, i32 -17>
> -; CHECK-NEXT: [[X321:%.*]] = zext <2 x i16> %x16 to <2 x i32>
> -; CHECK-NEXT: [[B:%.*]] = add <2 x i32> [[Y32OP0]], [[X321]]
> -; CHECK-NEXT: [[R:%.*]] = trunc <2 x i32> [[B]] to <2 x i16>
> +; CHECK-NEXT: [[TMP1:%.*]] = trunc <2 x i32> [[Y32OP0]] to <2 x i16>
> +; CHECK-NEXT: [[R:%.*]] = add <2 x i16> [[TMP1]], %x16
> ; CHECK-NEXT: ret <2 x i16> [[R]]
> ;
> %y32op0 = sdiv <2 x i32> %y32, <i32 7, i32 -17>
> @@ -241,9 +224,8 @@ define <2 x i16> @narrow_sext_add_commut
> define <2 x i16> @narrow_zext_add_commute(<2 x i16> %x16, <2 x i32> %y32)
> {
> ; CHECK-LABEL: @narrow_zext_add_commute(
> ; CHECK-NEXT: [[Y32OP0:%.*]] = sdiv <2 x i32> %y32, <i32 7, i32 -17>
> -; CHECK-NEXT: [[X32:%.*]] = zext <2 x i16> %x16 to <2 x i32>
> -; CHECK-NEXT: [[B:%.*]] = add <2 x i32> [[Y32OP0]], [[X32]]
> -; CHECK-NEXT: [[R:%.*]] = trunc <2 x i32> [[B]] to <2 x i16>
> +; CHECK-NEXT: [[TMP1:%.*]] = trunc <2 x i32> [[Y32OP0]] to <2 x i16>
> +; CHECK-NEXT: [[R:%.*]] = add <2 x i16> [[TMP1]], %x16
> ; CHECK-NEXT: ret <2 x i16> [[R]]
> ;
> %y32op0 = sdiv <2 x i32> %y32, <i32 7, i32 -17>
> @@ -256,9 +238,8 @@ define <2 x i16> @narrow_zext_add_commut
> define <2 x i16> @narrow_sext_mul_commute(<2 x i16> %x16, <2 x i32> %y32)
> {
> ; CHECK-LABEL: @narrow_sext_mul_commute(
> ; CHECK-NEXT: [[Y32OP0:%.*]] = sdiv <2 x i32> %y32, <i32 7, i32 -17>
> -; CHECK-NEXT: [[X32:%.*]] = sext <2 x i16> %x16 to <2 x i32>
> -; CHECK-NEXT: [[B:%.*]] = mul <2 x i32> [[Y32OP0]], [[X32]]
> -; CHECK-NEXT: [[R:%.*]] = trunc <2 x i32> [[B]] to <2 x i16>
> +; CHECK-NEXT: [[TMP1:%.*]] = trunc <2 x i32> [[Y32OP0]] to <2 x i16>
> +; CHECK-NEXT: [[R:%.*]] = mul <2 x i16> [[TMP1]], %x16
> ; CHECK-NEXT: ret <2 x i16> [[R]]
> ;
> %y32op0 = sdiv <2 x i32> %y32, <i32 7, i32 -17>
> @@ -271,9 +252,8 @@ define <2 x i16> @narrow_sext_mul_commut
> define <2 x i16> @narrow_zext_mul_commute(<2 x i16> %x16, <2 x i32> %y32)
> {
> ; CHECK-LABEL: @narrow_zext_mul_commute(
> ; CHECK-NEXT: [[Y32OP0:%.*]] = sdiv <2 x i32> %y32, <i32 7, i32 -17>
> -; CHECK-NEXT: [[X32:%.*]] = zext <2 x i16> %x16 to <2 x i32>
> -; CHECK-NEXT: [[B:%.*]] = mul <2 x i32> [[Y32OP0]], [[X32]]
> -; CHECK-NEXT: [[R:%.*]] = trunc <2 x i32> [[B]] to <2 x i16>
> +; CHECK-NEXT: [[TMP1:%.*]] = trunc <2 x i32> [[Y32OP0]] to <2 x i16>
> +; CHECK-NEXT: [[R:%.*]] = mul <2 x i16> [[TMP1]], %x16
> ; CHECK-NEXT: ret <2 x i16> [[R]]
> ;
> %y32op0 = sdiv <2 x i32> %y32, <i32 7, i32 -17>
>
>
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