[llvm] [RISCV] Cost @llvm.vector.{extract, insert} as free at index 0 (PR #81818)
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Wed Feb 14 20:31:23 PST 2024
llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-backend-risc-v
Author: Luke Lau (lukel97)
<details>
<summary>Changes</summary>
In #<!-- -->81751 we still weren't costing extracts of scalable subvectors from scalable vectors at index 0 as free.
It turns out that if the subvector to extract is scalable, then `getIntrinsicInstrCost` is used instead of `getShuffleCost`. This handles the index = 0 case for the vector insert and extract intrinsics inside said hook.
Note we'll still need to keep the existing logic inside `getShuffleCost`, since anything that's not:
- a scalable extract of a scalable vector or
- a scalable insert into a scalable vector
will still go down that path. As well as existing fixed-length `shufflevector`s.
Also note that there's some shortcut logic in `BasicTTImplBase::getIntrinsicInstrCost` where if the target `getIntrinsicInstrCost` is free, it won't bother calling into `getShuffleCost`:
https://github.com/llvm/llvm-project/blob/fc0b67e1d79d1f199687f8f06d619984d9520230/llvm/include/llvm/CodeGen/BasicTTIImpl.h#L1534-L1538
---
Patch is 43.08 KiB, truncated to 20.00 KiB below, full version: https://github.com/llvm/llvm-project/pull/81818.diff
4 Files Affected:
- (modified) llvm/lib/Target/RISCV/RISCVTargetTransformInfo.cpp (+28)
- (modified) llvm/test/Analysis/CostModel/RISCV/rvv-shuffle.ll (+6-6)
- (modified) llvm/test/Analysis/CostModel/RISCV/rvv-vectorextract.ll (+42-42)
- (modified) llvm/test/Analysis/CostModel/RISCV/rvv-vectorinsert.ll (+50-50)
``````````diff
diff --git a/llvm/lib/Target/RISCV/RISCVTargetTransformInfo.cpp b/llvm/lib/Target/RISCV/RISCVTargetTransformInfo.cpp
index d1db47a6061e4e..81d2b7cc1353af 100644
--- a/llvm/lib/Target/RISCV/RISCVTargetTransformInfo.cpp
+++ b/llvm/lib/Target/RISCV/RISCVTargetTransformInfo.cpp
@@ -809,6 +809,34 @@ RISCVTTIImpl::getIntrinsicInstrCost(const IntrinsicCostAttributes &ICA,
}
break;
}
+ case Intrinsic::vector_extract: {
+ // A vector extract at index 0 is a (free) subregister extract.
+ if (auto *CIdx = dyn_cast<ConstantInt>(ICA.getArgs()[1]);
+ CIdx && CIdx->isZero())
+ return TTI::TCC_Free;
+ break;
+ }
+ case Intrinsic::vector_insert: {
+ auto FitsSubreg = [this](Type *Ty) {
+ if (!isa<ScalableVectorType>(Ty))
+ return false;
+ // Any scalable vector LMUL >= 1 will fit exactly into a register group.
+ auto [_Cost, LT] = getTypeLegalizationCost(Ty);
+ auto [_Coeff, Fractional] =
+ RISCVVType::decodeVLMUL(RISCVTargetLowering::getLMUL(LT));
+ return !Fractional;
+ };
+
+ // A vector insert at index 0 is a (free) subregister insert if:
+ //
+ // - The subvec fits exactly into a register group or
+ // - The vector is undef
+ if (auto *CIdx = dyn_cast<ConstantInt>(ICA.getArgs()[2]);
+ CIdx && CIdx->isZero() &&
+ (FitsSubreg(ICA.getArgTypes()[1]) || isa<UndefValue>(ICA.getArgs()[0])))
+ return TTI::TCC_Free;
+ break;
+ }
// TODO: add more intrinsic
case Intrinsic::experimental_stepvector: {
unsigned Cost = 1; // vid
diff --git a/llvm/test/Analysis/CostModel/RISCV/rvv-shuffle.ll b/llvm/test/Analysis/CostModel/RISCV/rvv-shuffle.ll
index 4f3c7e2f90c655..348a6cf380e97d 100644
--- a/llvm/test/Analysis/CostModel/RISCV/rvv-shuffle.ll
+++ b/llvm/test/Analysis/CostModel/RISCV/rvv-shuffle.ll
@@ -52,17 +52,17 @@ define void @vector_broadcast() {
define void @vector_insert_extract(<vscale x 4 x i32> %v0, <vscale x 16 x i32> %v1, <16 x i32> %v2) {
; CHECK-LABEL: 'vector_insert_extract'
-; CHECK-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %extract_fixed_from_scalable = call <16 x i32> @llvm.vector.extract.v16i32.nxv4i32(<vscale x 4 x i32> %v0, i64 0)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %extract_fixed_from_scalable = call <16 x i32> @llvm.vector.extract.v16i32.nxv4i32(<vscale x 4 x i32> %v0, i64 0)
; CHECK-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %insert_fixed_into_scalable = call <vscale x 4 x i32> @llvm.vector.insert.nxv4i32.v16i32(<vscale x 4 x i32> %v0, <16 x i32> %v2, i64 0)
-; CHECK-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %extract_scalable_from_scalable = call <vscale x 4 x i32> @llvm.vector.extract.nxv4i32.nxv16i32(<vscale x 16 x i32> %v1, i64 0)
-; CHECK-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %insert_scalable_into_scalable = call <vscale x 16 x i32> @llvm.vector.insert.nxv16i32.nxv4i32(<vscale x 16 x i32> %v1, <vscale x 4 x i32> %v0, i64 0)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %extract_scalable_from_scalable = call <vscale x 4 x i32> @llvm.vector.extract.nxv4i32.nxv16i32(<vscale x 16 x i32> %v1, i64 0)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %insert_scalable_into_scalable = call <vscale x 16 x i32> @llvm.vector.insert.nxv16i32.nxv4i32(<vscale x 16 x i32> %v1, <vscale x 4 x i32> %v0, i64 0)
; CHECK-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret void
;
; SIZE-LABEL: 'vector_insert_extract'
-; SIZE-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %extract_fixed_from_scalable = call <16 x i32> @llvm.vector.extract.v16i32.nxv4i32(<vscale x 4 x i32> %v0, i64 0)
+; SIZE-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %extract_fixed_from_scalable = call <16 x i32> @llvm.vector.extract.v16i32.nxv4i32(<vscale x 4 x i32> %v0, i64 0)
; SIZE-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %insert_fixed_into_scalable = call <vscale x 4 x i32> @llvm.vector.insert.nxv4i32.v16i32(<vscale x 4 x i32> %v0, <16 x i32> %v2, i64 0)
-; SIZE-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %extract_scalable_from_scalable = call <vscale x 4 x i32> @llvm.vector.extract.nxv4i32.nxv16i32(<vscale x 16 x i32> %v1, i64 0)
-; SIZE-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %insert_scalable_into_scalable = call <vscale x 16 x i32> @llvm.vector.insert.nxv16i32.nxv4i32(<vscale x 16 x i32> %v1, <vscale x 4 x i32> %v0, i64 0)
+; SIZE-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %extract_scalable_from_scalable = call <vscale x 4 x i32> @llvm.vector.extract.nxv4i32.nxv16i32(<vscale x 16 x i32> %v1, i64 0)
+; SIZE-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %insert_scalable_into_scalable = call <vscale x 16 x i32> @llvm.vector.insert.nxv16i32.nxv4i32(<vscale x 16 x i32> %v1, <vscale x 4 x i32> %v0, i64 0)
; SIZE-NEXT: Cost Model: Found an estimated cost of 1 for instruction: ret void
;
%extract_fixed_from_scalable = call <16 x i32> @llvm.vector.extract.v16i32.nxv4i32(<vscale x 4 x i32> %v0, i64 0)
diff --git a/llvm/test/Analysis/CostModel/RISCV/rvv-vectorextract.ll b/llvm/test/Analysis/CostModel/RISCV/rvv-vectorextract.ll
index 1e2d1f4d94954e..c4653ace9bac09 100644
--- a/llvm/test/Analysis/CostModel/RISCV/rvv-vectorextract.ll
+++ b/llvm/test/Analysis/CostModel/RISCV/rvv-vectorextract.ll
@@ -4,37 +4,37 @@
define void @vector_extract_nxv128i8_0(<vscale x 128 x i8> %v) {
; CHECK-LABEL: 'vector_extract_nxv128i8_0'
-; CHECK-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %scalable_mf8 = call <vscale x 1 x i8> @llvm.vector.extract.nxv1i8.nxv128i8(<vscale x 128 x i8> %v, i64 0)
-; CHECK-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %scalable_mf4 = call <vscale x 2 x i8> @llvm.vector.extract.nxv2i8.nxv128i8(<vscale x 128 x i8> %v, i64 0)
-; CHECK-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %scalable_mf2 = call <vscale x 4 x i8> @llvm.vector.extract.nxv4i8.nxv128i8(<vscale x 128 x i8> %v, i64 0)
-; CHECK-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %scalable_m1 = call <vscale x 8 x i8> @llvm.vector.extract.nxv8i8.nxv128i8(<vscale x 128 x i8> %v, i64 0)
-; CHECK-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %scalable_m2 = call <vscale x 16 x i8> @llvm.vector.extract.nxv16i8.nxv128i8(<vscale x 128 x i8> %v, i64 0)
-; CHECK-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %scalable_m4 = call <vscale x 32 x i8> @llvm.vector.extract.nxv32i8.nxv128i8(<vscale x 128 x i8> %v, i64 0)
-; CHECK-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %scalable_m8 = call <vscale x 64 x i8> @llvm.vector.extract.nxv64i8.nxv128i8(<vscale x 128 x i8> %v, i64 0)
-; CHECK-NEXT: Cost Model: Found an estimated cost of 16 for instruction: %fixed_mf8 = call <2 x i8> @llvm.vector.extract.v2i8.nxv128i8(<vscale x 128 x i8> %v, i64 0)
-; CHECK-NEXT: Cost Model: Found an estimated cost of 16 for instruction: %fixed_mf4 = call <4 x i8> @llvm.vector.extract.v4i8.nxv128i8(<vscale x 128 x i8> %v, i64 0)
-; CHECK-NEXT: Cost Model: Found an estimated cost of 16 for instruction: %fixed_mf2 = call <8 x i8> @llvm.vector.extract.v8i8.nxv128i8(<vscale x 128 x i8> %v, i64 0)
-; CHECK-NEXT: Cost Model: Found an estimated cost of 16 for instruction: %fixed_m1 = call <16 x i8> @llvm.vector.extract.v16i8.nxv128i8(<vscale x 128 x i8> %v, i64 0)
-; CHECK-NEXT: Cost Model: Found an estimated cost of 16 for instruction: %fixed_m2 = call <32 x i8> @llvm.vector.extract.v32i8.nxv128i8(<vscale x 128 x i8> %v, i64 0)
-; CHECK-NEXT: Cost Model: Found an estimated cost of 16 for instruction: %fixed_m4 = call <64 x i8> @llvm.vector.extract.v64i8.nxv128i8(<vscale x 128 x i8> %v, i64 0)
-; CHECK-NEXT: Cost Model: Found an estimated cost of 16 for instruction: %fixed_m8 = call <128 x i8> @llvm.vector.extract.v128i8.nxv128i8(<vscale x 128 x i8> %v, i64 0)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %scalable_mf8 = call <vscale x 1 x i8> @llvm.vector.extract.nxv1i8.nxv128i8(<vscale x 128 x i8> %v, i64 0)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %scalable_mf4 = call <vscale x 2 x i8> @llvm.vector.extract.nxv2i8.nxv128i8(<vscale x 128 x i8> %v, i64 0)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %scalable_mf2 = call <vscale x 4 x i8> @llvm.vector.extract.nxv4i8.nxv128i8(<vscale x 128 x i8> %v, i64 0)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %scalable_m1 = call <vscale x 8 x i8> @llvm.vector.extract.nxv8i8.nxv128i8(<vscale x 128 x i8> %v, i64 0)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %scalable_m2 = call <vscale x 16 x i8> @llvm.vector.extract.nxv16i8.nxv128i8(<vscale x 128 x i8> %v, i64 0)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %scalable_m4 = call <vscale x 32 x i8> @llvm.vector.extract.nxv32i8.nxv128i8(<vscale x 128 x i8> %v, i64 0)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %scalable_m8 = call <vscale x 64 x i8> @llvm.vector.extract.nxv64i8.nxv128i8(<vscale x 128 x i8> %v, i64 0)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %fixed_mf8 = call <2 x i8> @llvm.vector.extract.v2i8.nxv128i8(<vscale x 128 x i8> %v, i64 0)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %fixed_mf4 = call <4 x i8> @llvm.vector.extract.v4i8.nxv128i8(<vscale x 128 x i8> %v, i64 0)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %fixed_mf2 = call <8 x i8> @llvm.vector.extract.v8i8.nxv128i8(<vscale x 128 x i8> %v, i64 0)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %fixed_m1 = call <16 x i8> @llvm.vector.extract.v16i8.nxv128i8(<vscale x 128 x i8> %v, i64 0)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %fixed_m2 = call <32 x i8> @llvm.vector.extract.v32i8.nxv128i8(<vscale x 128 x i8> %v, i64 0)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %fixed_m4 = call <64 x i8> @llvm.vector.extract.v64i8.nxv128i8(<vscale x 128 x i8> %v, i64 0)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %fixed_m8 = call <128 x i8> @llvm.vector.extract.v128i8.nxv128i8(<vscale x 128 x i8> %v, i64 0)
; CHECK-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret void
;
; SIZE-LABEL: 'vector_extract_nxv128i8_0'
-; SIZE-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %scalable_mf8 = call <vscale x 1 x i8> @llvm.vector.extract.nxv1i8.nxv128i8(<vscale x 128 x i8> %v, i64 0)
-; SIZE-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %scalable_mf4 = call <vscale x 2 x i8> @llvm.vector.extract.nxv2i8.nxv128i8(<vscale x 128 x i8> %v, i64 0)
-; SIZE-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %scalable_mf2 = call <vscale x 4 x i8> @llvm.vector.extract.nxv4i8.nxv128i8(<vscale x 128 x i8> %v, i64 0)
-; SIZE-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %scalable_m1 = call <vscale x 8 x i8> @llvm.vector.extract.nxv8i8.nxv128i8(<vscale x 128 x i8> %v, i64 0)
-; SIZE-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %scalable_m2 = call <vscale x 16 x i8> @llvm.vector.extract.nxv16i8.nxv128i8(<vscale x 128 x i8> %v, i64 0)
-; SIZE-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %scalable_m4 = call <vscale x 32 x i8> @llvm.vector.extract.nxv32i8.nxv128i8(<vscale x 128 x i8> %v, i64 0)
-; SIZE-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %scalable_m8 = call <vscale x 64 x i8> @llvm.vector.extract.nxv64i8.nxv128i8(<vscale x 128 x i8> %v, i64 0)
-; SIZE-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %fixed_mf8 = call <2 x i8> @llvm.vector.extract.v2i8.nxv128i8(<vscale x 128 x i8> %v, i64 0)
-; SIZE-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %fixed_mf4 = call <4 x i8> @llvm.vector.extract.v4i8.nxv128i8(<vscale x 128 x i8> %v, i64 0)
-; SIZE-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %fixed_mf2 = call <8 x i8> @llvm.vector.extract.v8i8.nxv128i8(<vscale x 128 x i8> %v, i64 0)
-; SIZE-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %fixed_m1 = call <16 x i8> @llvm.vector.extract.v16i8.nxv128i8(<vscale x 128 x i8> %v, i64 0)
-; SIZE-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %fixed_m2 = call <32 x i8> @llvm.vector.extract.v32i8.nxv128i8(<vscale x 128 x i8> %v, i64 0)
-; SIZE-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %fixed_m4 = call <64 x i8> @llvm.vector.extract.v64i8.nxv128i8(<vscale x 128 x i8> %v, i64 0)
-; SIZE-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %fixed_m8 = call <128 x i8> @llvm.vector.extract.v128i8.nxv128i8(<vscale x 128 x i8> %v, i64 0)
+; SIZE-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %scalable_mf8 = call <vscale x 1 x i8> @llvm.vector.extract.nxv1i8.nxv128i8(<vscale x 128 x i8> %v, i64 0)
+; SIZE-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %scalable_mf4 = call <vscale x 2 x i8> @llvm.vector.extract.nxv2i8.nxv128i8(<vscale x 128 x i8> %v, i64 0)
+; SIZE-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %scalable_mf2 = call <vscale x 4 x i8> @llvm.vector.extract.nxv4i8.nxv128i8(<vscale x 128 x i8> %v, i64 0)
+; SIZE-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %scalable_m1 = call <vscale x 8 x i8> @llvm.vector.extract.nxv8i8.nxv128i8(<vscale x 128 x i8> %v, i64 0)
+; SIZE-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %scalable_m2 = call <vscale x 16 x i8> @llvm.vector.extract.nxv16i8.nxv128i8(<vscale x 128 x i8> %v, i64 0)
+; SIZE-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %scalable_m4 = call <vscale x 32 x i8> @llvm.vector.extract.nxv32i8.nxv128i8(<vscale x 128 x i8> %v, i64 0)
+; SIZE-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %scalable_m8 = call <vscale x 64 x i8> @llvm.vector.extract.nxv64i8.nxv128i8(<vscale x 128 x i8> %v, i64 0)
+; SIZE-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %fixed_mf8 = call <2 x i8> @llvm.vector.extract.v2i8.nxv128i8(<vscale x 128 x i8> %v, i64 0)
+; SIZE-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %fixed_mf4 = call <4 x i8> @llvm.vector.extract.v4i8.nxv128i8(<vscale x 128 x i8> %v, i64 0)
+; SIZE-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %fixed_mf2 = call <8 x i8> @llvm.vector.extract.v8i8.nxv128i8(<vscale x 128 x i8> %v, i64 0)
+; SIZE-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %fixed_m1 = call <16 x i8> @llvm.vector.extract.v16i8.nxv128i8(<vscale x 128 x i8> %v, i64 0)
+; SIZE-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %fixed_m2 = call <32 x i8> @llvm.vector.extract.v32i8.nxv128i8(<vscale x 128 x i8> %v, i64 0)
+; SIZE-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %fixed_m4 = call <64 x i8> @llvm.vector.extract.v64i8.nxv128i8(<vscale x 128 x i8> %v, i64 0)
+; SIZE-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %fixed_m8 = call <128 x i8> @llvm.vector.extract.v128i8.nxv128i8(<vscale x 128 x i8> %v, i64 0)
; SIZE-NEXT: Cost Model: Found an estimated cost of 1 for instruction: ret void
;
%scalable_mf8 = call <vscale x 1 x i8> @llvm.vector.extract.nxv1i8.nxv128i8(<vscale x 128 x i8> %v, i64 0)
@@ -110,23 +110,23 @@ define void @vector_extract_nxv128i8_1(<vscale x 128 x i8> %v) {
define void @vector_extract_v128i8_0(<128 x i8> %v) {
; CHECK-LABEL: 'vector_extract_v128i8_0'
-; CHECK-NEXT: Cost Model: Found an estimated cost of 8 for instruction: %fixed_mf8 = call <2 x i8> @llvm.vector.extract.v2i8.v128i8(<128 x i8> %v, i64 0)
-; CHECK-NEXT: Cost Model: Found an estimated cost of 8 for instruction: %fixed_mf4 = call <4 x i8> @llvm.vector.extract.v4i8.v128i8(<128 x i8> %v, i64 0)
-; CHECK-NEXT: Cost Model: Found an estimated cost of 8 for instruction: %fixed_mf2 = call <8 x i8> @llvm.vector.extract.v8i8.v128i8(<128 x i8> %v, i64 0)
-; CHECK-NEXT: Cost Model: Found an estimated cost of 8 for instruction: %fixed_m1 = call <16 x i8> @llvm.vector.extract.v16i8.v128i8(<128 x i8> %v, i64 0)
-; CHECK-NEXT: Cost Model: Found an estimated cost of 8 for instruction: %fixed_m2 = call <32 x i8> @llvm.vector.extract.v32i8.v128i8(<128 x i8> %v, i64 0)
-; CHECK-NEXT: Cost Model: Found an estimated cost of 8 for instruction: %fixed_m4 = call <64 x i8> @llvm.vector.extract.v64i8.v128i8(<128 x i8> %v, i64 0)
-; CHECK-NEXT: Cost Model: Found an estimated cost of 8 for instruction: %fixed_m8 = call <128 x i8> @llvm.vector.extract.v128i8.v128i8(<128 x i8> %v, i64 0)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %fixed_mf8 = call <2 x i8> @llvm.vector.extract.v2i8.v128i8(<128 x i8> %v, i64 0)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %fixed_mf4 = call <4 x i8> @llvm.vector.extract.v4i8.v128i8(<128 x i8> %v, i64 0)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %fixed_mf2 = call <8 x i8> @llvm.vector.extract.v8i8.v128i8(<128 x i8> %v, i64 0)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %fixed_m1 = call <16 x i8> @llvm.vector.extract.v16i8.v128i8(<128 x i8> %v, i64 0)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %fixed_m2 = call <32 x i8> @llvm.vector.extract.v32i8.v128i8(<128 x i8> %v, i64 0)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %fixed_m4 = call <64 x i8> @llvm.vector.extract.v64i8.v128i8(<128 x i8> %v, i64 0)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %fixed_m8 = call <128 x i8> @llvm.vector.extract.v128i8.v128i8(<128 x i8> %v, i64 0)
; CHECK-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret void
;
; SIZE-LABEL: 'vector_extract_v128i8_0'
-; SIZE-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %fixed_mf8 = call <2 x i8> @llvm.vector.extract.v2i8.v128i8(<128 x i8> %v, i64 0)
-; SIZE-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %fixed_mf4 = call <4 x i8> @llvm.vector.extract.v4i8.v128i8(<128 x i8> %v, i64 0)
-; SIZE-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %fixed_mf2 = call <8 x i8> @llvm.vector.extract.v8i8.v128i8(<128 x i8> %v, i64 0)
-; SIZE-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %fixed_m1 = call <16 x i8> @llvm.vector.extract.v16i8.v128i8(<128 x i8> %v, i64 0)
-; SIZE-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %fixed_m2 = call <32 x i8> @llvm.vector.extract.v32i8.v128i8(<128 x i8> %v, i64 0)
-; SIZE-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %fixed_m4 = call <64 x i8> @llvm.vector.extract.v64i8.v128i8(<128 x i8> %v, i64 0)
-; SIZE-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %fixed_m8 = call <128 x i8> @llvm.vector.extract.v128i8.v128i8(<128 x i8> %v, i64 0)
+; SIZE-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %fixed_mf8 = call <2 x i8> @llvm.vector.extract.v2i8.v128i8(<128 x i8> %v, i64 0)
+; SIZE-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %fixed_mf4 = call <4 x i8> @llvm.vector.extract.v4i8.v128i8(<128 x i8> %v, i64 0)
+; SIZE-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %fixed_mf2 = call <8 x i8> @llvm.vector.extract.v8i8.v128i8(<128 x i8> %v, i64 0)
+; SIZE-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %fixed_m1 = call <16 x i8> @llvm.vector.extract.v16i8.v128i8(<128 x i8> %v, i64 0)
+; SIZE-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %fixed_m2 = call <32 x i8> @llvm.vector.extract.v32i8.v128i8(<128 x i8> %v, i64 0)
+; SIZE-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %fixed_m4 = call <64 x i8> @llvm.vector.extract.v64i8.v128i8(<128 x i8> %v, i64 0)
+; SIZE-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %fixed_m8 = call <128 x i8> @llvm.vector.extract.v128i8.v128i8(<128 x i8> %v, i64 0)
; SIZE-NEXT: Cost Model: Found an estimated cost of ...
[truncated]
``````````
</details>
https://github.com/llvm/llvm-project/pull/81818
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