[llvm] [CostModel] getInstructionCost - match SK_InsertSubvector shuffle patterns before SK_Select (PR #145920)
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llvm-commits at lists.llvm.org
Thu Jun 26 08:52:02 PDT 2025
llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-backend-amdgpu
@llvm/pr-subscribers-backend-x86
@llvm/pr-subscribers-llvm-analysis
Author: Simon Pilgrim (RKSimon)
<details>
<summary>Changes</summary>
More closely match improveShuffleKindFromMask's shuffle ordering by trying to match a SK_InsertSubvector shuffles patterns before SK_Select - both can match many of the same patterns, but its much easier to recognise when a SK_InsertSubvector can be converted to SK_Select then vice-versa.
Another step towards #<!-- -->145335 - which I'm hoping will allow us to generalise improveShuffleKindFromMask and remove getInstructionCost's shuffle matching entirely.
---
Patch is 230.04 KiB, truncated to 20.00 KiB below, full version: https://github.com/llvm/llvm-project/pull/145920.diff
12 Files Affected:
- (modified) llvm/include/llvm/Analysis/TargetTransformInfoImpl.h (+7-7)
- (modified) llvm/test/Analysis/CostModel/AArch64/shuffle-other.ll (+5-5)
- (modified) llvm/test/Analysis/CostModel/AMDGPU/shufflevector.ll (+24-24)
- (modified) llvm/test/Analysis/CostModel/ARM/shuffle.ll (+2-2)
- (modified) llvm/test/Analysis/CostModel/RISCV/shuffle-exact-vlen.ll (+12-12)
- (modified) llvm/test/Analysis/CostModel/RISCV/shuffle-insert_subvector.ll (+60-60)
- (modified) llvm/test/Analysis/CostModel/RISCV/shuffle-select.ll (+4-4)
- (modified) llvm/test/Analysis/CostModel/X86/alternate-shuffle-cost.ll (+13-33)
- (modified) llvm/test/Analysis/CostModel/X86/shuffle-insert_subvector.ll (+51-113)
- (modified) llvm/test/Analysis/CostModel/X86/shuffle-select.ll (+41-72)
- (modified) llvm/test/Transforms/PhaseOrdering/X86/hadd.ll (+2-1)
- (modified) llvm/test/Transforms/PhaseOrdering/X86/hsub.ll (+2-1)
``````````diff
diff --git a/llvm/include/llvm/Analysis/TargetTransformInfoImpl.h b/llvm/include/llvm/Analysis/TargetTransformInfoImpl.h
index c22928c9bcd94..d513e9472a152 100644
--- a/llvm/include/llvm/Analysis/TargetTransformInfoImpl.h
+++ b/llvm/include/llvm/Analysis/TargetTransformInfoImpl.h
@@ -1538,7 +1538,7 @@ class TargetTransformInfoImplCRTPBase : public TargetTransformInfoImplBase {
if (Shuffle->changesLength()) {
// Treat a 'subvector widening' as a free shuffle.
if (Shuffle->increasesLength() && Shuffle->isIdentityWithPadding())
- return 0;
+ return TTI::TCC_Free;
if (Shuffle->isExtractSubvectorMask(SubIndex))
return TargetTTI->getShuffleCost(TTI::SK_ExtractSubvector, VecTy,
@@ -1599,18 +1599,13 @@ class TargetTransformInfoImplCRTPBase : public TargetTransformInfoImplBase {
}
if (Shuffle->isIdentity())
- return 0;
+ return TTI::TCC_Free;
if (Shuffle->isReverse())
return TargetTTI->getShuffleCost(TTI::SK_Reverse, VecTy, VecSrcTy, Mask,
CostKind, 0, nullptr, Operands,
Shuffle);
- if (Shuffle->isSelect())
- return TargetTTI->getShuffleCost(TTI::SK_Select, VecTy, VecSrcTy, Mask,
- CostKind, 0, nullptr, Operands,
- Shuffle);
-
if (Shuffle->isTranspose())
return TargetTTI->getShuffleCost(TTI::SK_Transpose, VecTy, VecSrcTy,
Mask, CostKind, 0, nullptr, Operands,
@@ -1632,6 +1627,11 @@ class TargetTransformInfoImplCRTPBase : public TargetTransformInfoImplBase {
FixedVectorType::get(VecTy->getScalarType(), NumSubElts), Operands,
Shuffle);
+ if (Shuffle->isSelect())
+ return TargetTTI->getShuffleCost(TTI::SK_Select, VecTy, VecSrcTy, Mask,
+ CostKind, 0, nullptr, Operands,
+ Shuffle);
+
if (Shuffle->isSplice(SubIndex))
return TargetTTI->getShuffleCost(TTI::SK_Splice, VecTy, VecSrcTy, Mask,
CostKind, SubIndex, nullptr, Operands,
diff --git a/llvm/test/Analysis/CostModel/AArch64/shuffle-other.ll b/llvm/test/Analysis/CostModel/AArch64/shuffle-other.ll
index 8d68781d0c1b7..41c272291d7ca 100644
--- a/llvm/test/Analysis/CostModel/AArch64/shuffle-other.ll
+++ b/llvm/test/Analysis/CostModel/AArch64/shuffle-other.ll
@@ -87,21 +87,21 @@ define void @concat() {
define void @insert_subvec() {
; CHECK-LABEL: 'insert_subvec'
-; CHECK-NEXT: Cost Model: Found costs of RThru:12 CodeSize:6 Lat:12 SizeLat:12 for: %v4i8_2_0 = shufflevector <4 x i8> undef, <4 x i8> undef, <4 x i32> <i32 0, i32 1, i32 6, i32 7>
+; CHECK-NEXT: Cost Model: Found costs of 1 for: %v4i8_2_0 = shufflevector <4 x i8> undef, <4 x i8> undef, <4 x i32> <i32 0, i32 1, i32 6, i32 7>
; CHECK-NEXT: Cost Model: Found costs of 1 for: %v4i8_2_1 = shufflevector <4 x i8> undef, <4 x i8> undef, <4 x i32> <i32 4, i32 5, i32 0, i32 1>
-; CHECK-NEXT: Cost Model: Found costs of RThru:28 CodeSize:14 Lat:28 SizeLat:28 for: %v8i8_2_0 = shufflevector <8 x i8> undef, <8 x i8> undef, <8 x i32> <i32 8, i32 9, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7>
+; CHECK-NEXT: Cost Model: Found costs of 1 for: %v8i8_2_0 = shufflevector <8 x i8> undef, <8 x i8> undef, <8 x i32> <i32 8, i32 9, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7>
; CHECK-NEXT: Cost Model: Found costs of 1 for: %v8i8_2_1 = shufflevector <8 x i8> undef, <8 x i8> undef, <8 x i32> <i32 0, i32 1, i32 8, i32 9, i32 4, i32 5, i32 6, i32 7>
; CHECK-NEXT: Cost Model: Found costs of 1 for: %v8i8_2_2 = shufflevector <8 x i8> undef, <8 x i8> undef, <8 x i32> <i32 0, i32 1, i32 2, i32 3, i32 8, i32 9, i32 6, i32 7>
; CHECK-NEXT: Cost Model: Found costs of 1 for: %v8i8_2_3 = shufflevector <8 x i8> undef, <8 x i8> undef, <8 x i32> <i32 0, i32 1, i32 2, i32 3, i32 4, i32 5, i32 8, i32 9>
; CHECK-NEXT: Cost Model: Found costs of RThru:6 CodeSize:3 Lat:6 SizeLat:6 for: %v8i8_2_05 = shufflevector <8 x i8> undef, <8 x i8> undef, <8 x i32> <i32 0, i32 8, i32 9, i32 3, i32 4, i32 5, i32 6, i32 7>
-; CHECK-NEXT: Cost Model: Found costs of RThru:60 CodeSize:30 Lat:60 SizeLat:60 for: %v16i8_4_0 = shufflevector <16 x i8> undef, <16 x i8> undef, <16 x i32> <i32 16, i32 17, i32 18, i32 19, i32 4, i32 5, i32 6, i32 7, i32 8, i32 9, i32 10, i32 11, i32 12, i32 13, i32 14, i32 15>
+; CHECK-NEXT: Cost Model: Found costs of 1 for: %v16i8_4_0 = shufflevector <16 x i8> undef, <16 x i8> undef, <16 x i32> <i32 16, i32 17, i32 18, i32 19, i32 4, i32 5, i32 6, i32 7, i32 8, i32 9, i32 10, i32 11, i32 12, i32 13, i32 14, i32 15>
; CHECK-NEXT: Cost Model: Found costs of 1 for: %v16i8_4_1 = shufflevector <16 x i8> undef, <16 x i8> undef, <16 x i32> <i32 0, i32 1, i32 2, i32 3, i32 16, i32 17, i32 18, i32 19, i32 8, i32 9, i32 10, i32 11, i32 12, i32 13, i32 14, i32 15>
; CHECK-NEXT: Cost Model: Found costs of 1 for: %v16i8_4_2 = shufflevector <16 x i8> undef, <16 x i8> undef, <16 x i32> <i32 0, i32 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7, i32 16, i32 17, i32 18, i32 19, i32 12, i32 13, i32 14, i32 15>
; CHECK-NEXT: Cost Model: Found costs of 1 for: %v16i8_4_3 = shufflevector <16 x i8> undef, <16 x i8> undef, <16 x i32> <i32 0, i32 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7, i32 8, i32 9, i32 10, i32 11, i32 16, i32 17, i32 18, i32 19>
; CHECK-NEXT: Cost Model: Found costs of RThru:14 CodeSize:7 Lat:14 SizeLat:14 for: %v16i8_4_05 = shufflevector <16 x i8> undef, <16 x i8> undef, <16 x i32> <i32 0, i32 1, i32 16, i32 17, i32 18, i32 19, i32 6, i32 7, i32 8, i32 9, i32 10, i32 11, i32 12, i32 13, i32 14, i32 15>
; CHECK-NEXT: Cost Model: Found costs of 1 for: %v4i16_2_0 = shufflevector <4 x i16> undef, <4 x i16> undef, <4 x i32> <i32 0, i32 1, i32 6, i32 7>
; CHECK-NEXT: Cost Model: Found costs of 1 for: %v4i16_2_1 = shufflevector <4 x i16> undef, <4 x i16> undef, <4 x i32> <i32 4, i32 5, i32 0, i32 1>
-; CHECK-NEXT: Cost Model: Found costs of RThru:28 CodeSize:14 Lat:28 SizeLat:28 for: %v8i16_2_0 = shufflevector <8 x i16> undef, <8 x i16> undef, <8 x i32> <i32 8, i32 9, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7>
+; CHECK-NEXT: Cost Model: Found costs of 1 for: %v8i16_2_0 = shufflevector <8 x i16> undef, <8 x i16> undef, <8 x i32> <i32 8, i32 9, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7>
; CHECK-NEXT: Cost Model: Found costs of 1 for: %v8i16_2_1 = shufflevector <8 x i16> undef, <8 x i16> undef, <8 x i32> <i32 0, i32 1, i32 8, i32 9, i32 4, i32 5, i32 6, i32 7>
; CHECK-NEXT: Cost Model: Found costs of 1 for: %v8i16_2_2 = shufflevector <8 x i16> undef, <8 x i16> undef, <8 x i32> <i32 0, i32 1, i32 2, i32 3, i32 8, i32 9, i32 6, i32 7>
; CHECK-NEXT: Cost Model: Found costs of 1 for: %v8i16_2_3 = shufflevector <8 x i16> undef, <8 x i16> undef, <8 x i32> <i32 0, i32 1, i32 2, i32 3, i32 4, i32 5, i32 8, i32 9>
@@ -118,7 +118,7 @@ define void @insert_subvec() {
; CHECK-NEXT: Cost Model: Found costs of 1 for: %v8i32_2_2 = shufflevector <8 x i32> undef, <8 x i32> undef, <8 x i32> <i32 0, i32 1, i32 2, i32 3, i32 8, i32 9, i32 6, i32 7>
; CHECK-NEXT: Cost Model: Found costs of 1 for: %v8i32_2_3 = shufflevector <8 x i32> undef, <8 x i32> undef, <8 x i32> <i32 0, i32 1, i32 2, i32 3, i32 4, i32 5, i32 8, i32 9>
; CHECK-NEXT: Cost Model: Found costs of RThru:6 CodeSize:3 Lat:6 SizeLat:6 for: %v8i32_2_05 = shufflevector <8 x i32> undef, <8 x i32> undef, <8 x i32> <i32 0, i32 8, i32 9, i32 3, i32 4, i32 5, i32 6, i32 7>
-; CHECK-NEXT: Cost Model: Found costs of 0 for: %v16i32_4_0 = shufflevector <16 x i32> undef, <16 x i32> undef, <16 x i32> <i32 16, i32 17, i32 18, i32 19, i32 4, i32 5, i32 6, i32 7, i32 8, i32 9, i32 10, i32 11, i32 12, i32 13, i32 14, i32 15>
+; CHECK-NEXT: Cost Model: Found costs of 1 for: %v16i32_4_0 = shufflevector <16 x i32> undef, <16 x i32> undef, <16 x i32> <i32 16, i32 17, i32 18, i32 19, i32 4, i32 5, i32 6, i32 7, i32 8, i32 9, i32 10, i32 11, i32 12, i32 13, i32 14, i32 15>
; CHECK-NEXT: Cost Model: Found costs of 1 for: %v16i32_4_1 = shufflevector <16 x i32> undef, <16 x i32> undef, <16 x i32> <i32 0, i32 1, i32 2, i32 3, i32 16, i32 17, i32 18, i32 19, i32 8, i32 9, i32 10, i32 11, i32 12, i32 13, i32 14, i32 15>
; CHECK-NEXT: Cost Model: Found costs of 1 for: %v16i32_4_2 = shufflevector <16 x i32> undef, <16 x i32> undef, <16 x i32> <i32 0, i32 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7, i32 16, i32 17, i32 18, i32 19, i32 12, i32 13, i32 14, i32 15>
; CHECK-NEXT: Cost Model: Found costs of 1 for: %v16i32_4_3 = shufflevector <16 x i32> undef, <16 x i32> undef, <16 x i32> <i32 0, i32 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7, i32 8, i32 9, i32 10, i32 11, i32 16, i32 17, i32 18, i32 19>
diff --git a/llvm/test/Analysis/CostModel/AMDGPU/shufflevector.ll b/llvm/test/Analysis/CostModel/AMDGPU/shufflevector.ll
index 1705cd2a2f091..4fc8c44e12668 100644
--- a/llvm/test/Analysis/CostModel/AMDGPU/shufflevector.ll
+++ b/llvm/test/Analysis/CostModel/AMDGPU/shufflevector.ll
@@ -16,11 +16,11 @@ define amdgpu_kernel void @shufflevector_i16(<2 x i16> %vec1, <2 x i16> %vec2) {
; GFX9-10-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %shuf02 = shufflevector <2 x i16> %vec1, <2 x i16> %vec1, <2 x i32> <i32 0, i32 2>
; GFX9-10-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %shuf20 = shufflevector <2 x i16> %vec1, <2 x i16> %vec1, <2 x i32> <i32 2, i32 0>
; GFX9-10-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %shuf22 = shufflevector <2 x i16> %vec1, <2 x i16> %vec1, <2 x i32> <i32 2, i32 2>
-; GFX9-10-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %shuf03 = shufflevector <2 x i16> %vec1, <2 x i16> %vec1, <2 x i32> <i32 0, i32 3>
+; GFX9-10-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %shuf03 = shufflevector <2 x i16> %vec1, <2 x i16> %vec1, <2 x i32> <i32 0, i32 3>
; GFX9-10-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %shuf30 = shufflevector <2 x i16> %vec1, <2 x i16> %vec1, <2 x i32> <i32 3, i32 0>
; GFX9-10-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %shuf33 = shufflevector <2 x i16> %vec1, <2 x i16> %vec1, <2 x i32> <i32 3, i32 3>
; GFX9-10-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %shuf12 = shufflevector <2 x i16> %vec1, <2 x i16> %vec1, <2 x i32> <i32 1, i32 2>
-; GFX9-10-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %shuf21 = shufflevector <2 x i16> %vec1, <2 x i16> %vec1, <2 x i32> <i32 2, i32 1>
+; GFX9-10-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %shuf21 = shufflevector <2 x i16> %vec1, <2 x i16> %vec1, <2 x i32> <i32 2, i32 1>
; GFX9-10-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %shuf13 = shufflevector <2 x i16> %vec1, <2 x i16> %vec1, <2 x i32> <i32 1, i32 3>
; GFX9-10-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %shuf31 = shufflevector <2 x i16> %vec1, <2 x i16> %vec1, <2 x i32> <i32 3, i32 1>
; GFX9-10-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %shuf23 = shufflevector <2 x i16> %vec1, <2 x i16> %vec1, <2 x i32> <i32 2, i32 3>
@@ -53,11 +53,11 @@ define amdgpu_kernel void @shufflevector_i16(<2 x i16> %vec1, <2 x i16> %vec2) {
; GFX9-10-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %shuf02_2 = shufflevector <2 x i16> %vec1, <2 x i16> %vec2, <2 x i32> <i32 0, i32 2>
; GFX9-10-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %shuf20_2 = shufflevector <2 x i16> %vec1, <2 x i16> %vec2, <2 x i32> <i32 2, i32 0>
; GFX9-10-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %shuf22_2 = shufflevector <2 x i16> %vec1, <2 x i16> %vec2, <2 x i32> <i32 2, i32 2>
-; GFX9-10-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %shuf03_2 = shufflevector <2 x i16> %vec1, <2 x i16> %vec2, <2 x i32> <i32 0, i32 3>
+; GFX9-10-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %shuf03_2 = shufflevector <2 x i16> %vec1, <2 x i16> %vec2, <2 x i32> <i32 0, i32 3>
; GFX9-10-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %shuf30_2 = shufflevector <2 x i16> %vec1, <2 x i16> %vec2, <2 x i32> <i32 3, i32 0>
; GFX9-10-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %shuf33_2 = shufflevector <2 x i16> %vec1, <2 x i16> %vec2, <2 x i32> <i32 3, i32 3>
; GFX9-10-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %shuf12_2 = shufflevector <2 x i16> %vec1, <2 x i16> %vec2, <2 x i32> <i32 1, i32 2>
-; GFX9-10-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %shuf21_2 = shufflevector <2 x i16> %vec1, <2 x i16> %vec2, <2 x i32> <i32 2, i32 1>
+; GFX9-10-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %shuf21_2 = shufflevector <2 x i16> %vec1, <2 x i16> %vec2, <2 x i32> <i32 2, i32 1>
; GFX9-10-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %shuf13_2 = shufflevector <2 x i16> %vec1, <2 x i16> %vec2, <2 x i32> <i32 1, i32 3>
; GFX9-10-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %shuf31_2 = shufflevector <2 x i16> %vec1, <2 x i16> %vec2, <2 x i32> <i32 3, i32 1>
; GFX9-10-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %shuf23_2 = shufflevector <2 x i16> %vec1, <2 x i16> %vec2, <2 x i32> <i32 2, i32 3>
@@ -93,11 +93,11 @@ define amdgpu_kernel void @shufflevector_i16(<2 x i16> %vec1, <2 x i16> %vec2) {
; VI-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %shuf02 = shufflevector <2 x i16> %vec1, <2 x i16> %vec1, <2 x i32> <i32 0, i32 2>
; VI-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %shuf20 = shufflevector <2 x i16> %vec1, <2 x i16> %vec1, <2 x i32> <i32 2, i32 0>
; VI-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %shuf22 = shufflevector <2 x i16> %vec1, <2 x i16> %vec1, <2 x i32> <i32 2, i32 2>
-; VI-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %shuf03 = shufflevector <2 x i16> %vec1, <2 x i16> %vec1, <2 x i32> <i32 0, i32 3>
+; VI-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %shuf03 = shufflevector <2 x i16> %vec1, <2 x i16> %vec1, <2 x i32> <i32 0, i32 3>
; VI-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %shuf30 = shufflevector <2 x i16> %vec1, <2 x i16> %vec1, <2 x i32> <i32 3, i32 0>
; VI-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %shuf33 = shufflevector <2 x i16> %vec1, <2 x i16> %vec1, <2 x i32> <i32 3, i32 3>
; VI-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %shuf12 = shufflevector <2 x i16> %vec1, <2 x i16> %vec1, <2 x i32> <i32 1, i32 2>
-; VI-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %shuf21 = shufflevector <2 x i16> %vec1, <2 x i16> %vec1, <2 x i32> <i32 2, i32 1>
+; VI-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %shuf21 = shufflevector <2 x i16> %vec1, <2 x i16> %vec1, <2 x i32> <i32 2, i32 1>
; VI-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %shuf13 = shufflevector <2 x i16> %vec1, <2 x i16> %vec1, <2 x i32> <i32 1, i32 3>
; VI-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %shuf31 = shufflevector <2 x i16> %vec1, <2 x i16> %vec1, <2 x i32> <i32 3, i32 1>
; VI-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %shuf23 = shufflevector <2 x i16> %vec1, <2 x i16> %vec1, <2 x i32> <i32 2, i32 3>
@@ -130,11 +130,11 @@ define amdgpu_kernel void @shufflevector_i16(<2 x i16> %vec1, <2 x i16> %vec2) {
; VI-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %shuf02_2 = shufflevector <2 x i16> %vec1, <2 x i16> %vec2, <2 x i32> <i32 0, i32 2>
; VI-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %shuf20_2 = shufflevector <2 x i16> %vec1, <2 x i16> %vec2, <2 x i32> <i32 2, i32 0>
; VI-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %shuf22_2 = shufflevector <2 x i16> %vec1, <2 x i16> %vec2, <2 x i32> <i32 2, i32 2>
-; VI-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %shuf03_2 = shufflevector <2 x i16> %vec1, <2 x i16> %vec2, <2 x i32> <i32 0, i32 3>
+; VI-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %shuf03_2 = shufflevector <2 x i16> %vec1, <2 x i16> %vec2, <2 x i32> <i32 0, i32 3>
; VI-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %shuf30_2 = shufflevector <2 x i16> %vec1, <2 x i16> %vec2, <2 x i32> <i32 3, i32 0>
; VI-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %shuf33_2 = shufflevector <2 x i16> %vec1, <2 x i16> %vec2, <2 x i32> <i32 3, i32 3>
; VI-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %shuf12_2 = shufflevector <2 x i16> %vec1, <2 x i16> %vec2, <2 x i32> <i32 1, i32 2>
-; VI-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %shuf21_2 = shufflevector <2 x i16> %vec1, <2 x i16> %vec2, <2 x i32> <i32 2, i32 1>
+; VI-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %shuf21_2 = shufflevector <2 x i16> %vec1, <2 x i16> %vec2, <2 x i32> <i32 2, i32 1>
; VI-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %shuf13_2 = shufflevector <2 x i16> %vec1, <2 x i16> %vec2, <2 x i32> <i32 1, i32 3>
; VI-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %shuf31_2 = shufflevector <2 x i16> %vec1, <2 x i16> %vec2, <2 x i32> <i32 3, i32 1>
; VI-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %shuf23_2 = shufflevector <2 x i16> %vec1, <2 x i16> %vec2, <2 x i32> <i32 2, i32 3>
@@ -170,11 +170,11 @@ define amdgpu_kernel void @shufflevector_i16(<2 x i16> %vec1, <2 x i16> %vec2) {
; GFX9-10-SIZE-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %shuf02 = shufflevector <2 x i16> %vec1, <2 x i16> %vec1, <2 x i32> <i32 0, i32 2>
; GFX9-10-SIZE-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %shuf20 = shufflevector <2 x i16> %vec1, <2 x i16> %vec1, <2 x i32> <i32 2, i32 0>
; GFX9-10-SIZE-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %shuf22 = shufflevector <2 x i16> %vec1, <2 x i16> %vec1, <2 x i32> <i32 2, i32 2>
-; GFX9-10-SIZE-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %shuf03 = shufflevector <2 x i16> %vec1, <2 x i16> %vec1, <2 x i32> <i32 0, i32 3>
+; GFX9-10-SIZE-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %shuf03 = shufflevector <2 x i16> %vec1, <2 x i16> %vec1, <2 x i32> <i32 0, i32 3>
; GFX9-10-SIZE-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %shuf30 = shufflevector <2 x i16> %vec1, <2 x i16> %vec1, <2 x i32> <i32 3, i32 0>
; GFX9-10-SIZE-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %shuf33 = shufflevector <2 x i16> %vec1, <2 x i16> %vec1, <2 x i32> <i32 3, i32 3>
; GFX9-10-SIZE-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %shuf12 = shufflevector <2 x i16> %vec1, <2 x i16> %vec1, <2 x i32> <i32 1, i32 2>
-; GFX9-10-SIZE-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %shuf21 = shufflevector <2 x i16> %vec1, <2 x i16> %vec1, <2 x i32> <i32 2, i32 1>
+; GFX9-10-SIZE-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %shuf21 = shufflevector <2 x i16> %vec1, <2 x i16> %vec1, <2 x i32> <i32 2, i32 1>
; GFX9-10-SIZE-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %shuf13 = shufflevector <2 x i16> %vec1, <2 x i16> %vec1, <2 x i32> <i32 1, i32 3>
; GFX9-10-SIZE-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %shuf31 = shufflevector <2 x i16> %vec1, <2 x i16> %vec1, <2 x i32> <i32 3, i32 1>
; GFX9-10-SIZE-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %shuf23 = shufflevector <2 x i16> %vec1, <2 x i16> %vec1, <2 x i32> <i32 2, i32 3>
@@ -207,11 +207,11 @@ define amdgpu_kernel void @shufflevector_i16(<2 x i16> %vec1, <2 x i16> %vec2) {
; GFX9-10-SIZE-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %shuf02_2 = shufflevector <2 x i16> %vec1, <2 x i16> %vec2, <2 x i32> <i32 0, i32 2>
; GFX9-10-SIZE-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %shuf20_2 = shufflevector <2 x i16> %vec1, <2 x i16> %vec2, <2 x i32> <i32 2, i32 0>
; GFX9-10-SIZE-NEXT: Cost Model: Found an estimated...
[truncated]
``````````
</details>
https://github.com/llvm/llvm-project/pull/145920
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