[llvm] [AArch64][CostModel] Reduce the cost of fadd reduction with fast flag (PR #108791)
via llvm-commits
llvm-commits at lists.llvm.org
Sun Sep 15 22:38:09 PDT 2024
llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-llvm-analysis
Author: Sushant Gokhale (sushgokh)
<details>
<summary>Changes</summary>
fadd reduction with
1. Fast flag set
2. No of elements in input vector is power of 2 results in series of faddp instructions. faddp instruction has latency/throughput identical to fadd instruction and hence, we set relative cost=1 for faddp as well.
The change didn't show any regression with SPEC17-FP(C/C++), llvm-test-suite on Neoverse-V2.
---
Patch is 36.73 KiB, truncated to 20.00 KiB below, full version: https://github.com/llvm/llvm-project/pull/108791.diff
3 Files Affected:
- (modified) llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp (+16)
- (modified) llvm/test/Analysis/CostModel/AArch64/reduce-fadd.ll (+75-75)
- (modified) llvm/test/Transforms/SLPVectorizer/AArch64/reduce-fadd.ll (+16-74)
``````````diff
diff --git a/llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp b/llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp
index 649ba1ac8749f5..6575ef87501bbb 100644
--- a/llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp
+++ b/llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp
@@ -4147,6 +4147,22 @@ AArch64TTIImpl::getArithmeticReductionCost(unsigned Opcode, VectorType *ValTy,
switch (ISD) {
default:
break;
+ case ISD::FADD: {
+ if (MTy.isVector()) {
+ // FIXME: Consider cases where the number of vector elements is not power
+ // of 2.
+ const unsigned NElts = MTy.getVectorNumElements();
+ if (ValTy->getElementCount().getFixedValue() >= 2 && NElts >= 2 &&
+ isPowerOf2_32(NElts)) {
+ // Reduction corresponding to series of fadd instructions is lowered to
+ // series of faddp instructions. faddp has latency/throughput that
+ // matches fadd instruction and hence, every faddp instruction can be
+ // considered to have a relative cost=1 with
+ // CostKind=TCK_RecipThroughput.
+ return (LT.first - 1) + /*No of faddp instructions*/ Log2_32(NElts);
+ }
+ }
+ } break;
case ISD::ADD:
if (const auto *Entry = CostTableLookup(CostTblNoPairwise, ISD, MTy))
return (LT.first - 1) + Entry->Cost;
diff --git a/llvm/test/Analysis/CostModel/AArch64/reduce-fadd.ll b/llvm/test/Analysis/CostModel/AArch64/reduce-fadd.ll
index 58cb8c2c6a8d81..30abc48c967686 100644
--- a/llvm/test/Analysis/CostModel/AArch64/reduce-fadd.ll
+++ b/llvm/test/Analysis/CostModel/AArch64/reduce-fadd.ll
@@ -66,89 +66,89 @@ define void @strict_fp_reductions() {
define void @fast_fp_reductions() {
; CHECK-LABEL: 'fast_fp_reductions'
-; CHECK-NEXT: Cost Model: Found an estimated cost of 5 for instruction: %fadd_v2f16_fast = call fast half @llvm.vector.reduce.fadd.v2f16(half 0xH0000, <2 x half> undef)
-; CHECK-NEXT: Cost Model: Found an estimated cost of 5 for instruction: %fadd_v2f16_reassoc = call reassoc half @llvm.vector.reduce.fadd.v2f16(half 0xH0000, <2 x half> undef)
-; CHECK-NEXT: Cost Model: Found an estimated cost of 10 for instruction: %fadd_v4f16_fast = call fast half @llvm.vector.reduce.fadd.v4f16(half 0xH0000, <4 x half> undef)
-; CHECK-NEXT: Cost Model: Found an estimated cost of 10 for instruction: %fadd_v4f16_reassoc = call reassoc half @llvm.vector.reduce.fadd.v4f16(half 0xH0000, <4 x half> undef)
-; CHECK-NEXT: Cost Model: Found an estimated cost of 30 for instruction: %fadd_v8f16 = call fast half @llvm.vector.reduce.fadd.v8f16(half 0xH0000, <8 x half> undef)
-; CHECK-NEXT: Cost Model: Found an estimated cost of 30 for instruction: %fadd_v8f16_reassoc = call reassoc half @llvm.vector.reduce.fadd.v8f16(half 0xH0000, <8 x half> undef)
-; CHECK-NEXT: Cost Model: Found an estimated cost of 48 for instruction: %fadd_v16f16 = call fast half @llvm.vector.reduce.fadd.v16f16(half 0xH0000, <16 x half> undef)
-; CHECK-NEXT: Cost Model: Found an estimated cost of 48 for instruction: %fadd_v16f16_reassoc = call reassoc half @llvm.vector.reduce.fadd.v16f16(half 0xH0000, <16 x half> undef)
-; CHECK-NEXT: Cost Model: Found an estimated cost of 38 for instruction: %fadd_v11f16 = call fast half @llvm.vector.reduce.fadd.v11f16(half 0xH0000, <11 x half> undef)
-; CHECK-NEXT: Cost Model: Found an estimated cost of 38 for instruction: %fadd_v13f16_reassoc = call reassoc half @llvm.vector.reduce.fadd.v13f16(half 0xH0000, <13 x half> undef)
-; CHECK-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %fadd_v2f32 = call fast float @llvm.vector.reduce.fadd.v2f32(float 0.000000e+00, <2 x float> undef)
-; CHECK-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %fadd_v2f32_reassoc = call reassoc float @llvm.vector.reduce.fadd.v2f32(float 0.000000e+00, <2 x float> undef)
-; CHECK-NEXT: Cost Model: Found an estimated cost of 8 for instruction: %fadd_v4f32 = call fast float @llvm.vector.reduce.fadd.v4f32(float 0.000000e+00, <4 x float> undef)
-; CHECK-NEXT: Cost Model: Found an estimated cost of 8 for instruction: %fadd_v4f32_reassoc = call reassoc float @llvm.vector.reduce.fadd.v4f32(float 0.000000e+00, <4 x float> undef)
-; CHECK-NEXT: Cost Model: Found an estimated cost of 15 for instruction: %fadd_v8f32 = call fast float @llvm.vector.reduce.fadd.v8f32(float 0.000000e+00, <8 x float> undef)
-; CHECK-NEXT: Cost Model: Found an estimated cost of 15 for instruction: %fadd_v8f32_reassoc = call reassoc float @llvm.vector.reduce.fadd.v8f32(float 0.000000e+00, <8 x float> undef)
-; CHECK-NEXT: Cost Model: Found an estimated cost of 25 for instruction: %fadd_v13f32 = call fast float @llvm.vector.reduce.fadd.v13f32(float 0.000000e+00, <13 x float> undef)
-; CHECK-NEXT: Cost Model: Found an estimated cost of 9 for instruction: %fadd_v5f32_reassoc = call reassoc float @llvm.vector.reduce.fadd.v5f32(float 0.000000e+00, <5 x float> undef)
-; CHECK-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %fadd_v2f64 = call fast double @llvm.vector.reduce.fadd.v2f64(double 0.000000e+00, <2 x double> undef)
-; CHECK-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %fadd_v2f64_reassoc = call reassoc double @llvm.vector.reduce.fadd.v2f64(double 0.000000e+00, <2 x double> undef)
-; CHECK-NEXT: Cost Model: Found an estimated cost of 5 for instruction: %fadd_v4f64 = call fast double @llvm.vector.reduce.fadd.v4f64(double 0.000000e+00, <4 x double> undef)
-; CHECK-NEXT: Cost Model: Found an estimated cost of 5 for instruction: %fadd_v4f64_reassoc = call reassoc double @llvm.vector.reduce.fadd.v4f64(double 0.000000e+00, <4 x double> undef)
-; CHECK-NEXT: Cost Model: Found an estimated cost of 9 for instruction: %fadd_v7f64 = call fast double @llvm.vector.reduce.fadd.v7f64(double 0.000000e+00, <7 x double> undef)
-; CHECK-NEXT: Cost Model: Found an estimated cost of 15 for instruction: %fadd_v9f64_reassoc = call reassoc double @llvm.vector.reduce.fadd.v9f64(double 0.000000e+00, <9 x double> undef)
-; CHECK-NEXT: Cost Model: Found an estimated cost of 10 for instruction: %fadd_v4f8 = call reassoc bfloat @llvm.vector.reduce.fadd.v4bf16(bfloat 0xR8000, <4 x bfloat> undef)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %fadd_v2f16_fast = call fast half @llvm.vector.reduce.fadd.v2f16(half 0xH0000, <2 x half> undef)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %fadd_v2f16_reassoc = call reassoc half @llvm.vector.reduce.fadd.v2f16(half 0xH0000, <2 x half> undef)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %fadd_v4f16_fast = call fast half @llvm.vector.reduce.fadd.v4f16(half 0xH0000, <4 x half> undef)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %fadd_v4f16_reassoc = call reassoc half @llvm.vector.reduce.fadd.v4f16(half 0xH0000, <4 x half> undef)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 3 for instruction: %fadd_v8f16 = call fast half @llvm.vector.reduce.fadd.v8f16(half 0xH0000, <8 x half> undef)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 3 for instruction: %fadd_v8f16_reassoc = call reassoc half @llvm.vector.reduce.fadd.v8f16(half 0xH0000, <8 x half> undef)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 4 for instruction: %fadd_v16f16 = call fast half @llvm.vector.reduce.fadd.v16f16(half 0xH0000, <16 x half> undef)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 4 for instruction: %fadd_v16f16_reassoc = call reassoc half @llvm.vector.reduce.fadd.v16f16(half 0xH0000, <16 x half> undef)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 4 for instruction: %fadd_v11f16 = call fast half @llvm.vector.reduce.fadd.v11f16(half 0xH0000, <11 x half> undef)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 4 for instruction: %fadd_v13f16_reassoc = call reassoc half @llvm.vector.reduce.fadd.v13f16(half 0xH0000, <13 x half> undef)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %fadd_v2f32 = call fast float @llvm.vector.reduce.fadd.v2f32(float 0.000000e+00, <2 x float> undef)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %fadd_v2f32_reassoc = call reassoc float @llvm.vector.reduce.fadd.v2f32(float 0.000000e+00, <2 x float> undef)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %fadd_v4f32 = call fast float @llvm.vector.reduce.fadd.v4f32(float 0.000000e+00, <4 x float> undef)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %fadd_v4f32_reassoc = call reassoc float @llvm.vector.reduce.fadd.v4f32(float 0.000000e+00, <4 x float> undef)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 3 for instruction: %fadd_v8f32 = call fast float @llvm.vector.reduce.fadd.v8f32(float 0.000000e+00, <8 x float> undef)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 3 for instruction: %fadd_v8f32_reassoc = call reassoc float @llvm.vector.reduce.fadd.v8f32(float 0.000000e+00, <8 x float> undef)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 5 for instruction: %fadd_v13f32 = call fast float @llvm.vector.reduce.fadd.v13f32(float 0.000000e+00, <13 x float> undef)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 3 for instruction: %fadd_v5f32_reassoc = call reassoc float @llvm.vector.reduce.fadd.v5f32(float 0.000000e+00, <5 x float> undef)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %fadd_v2f64 = call fast double @llvm.vector.reduce.fadd.v2f64(double 0.000000e+00, <2 x double> undef)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %fadd_v2f64_reassoc = call reassoc double @llvm.vector.reduce.fadd.v2f64(double 0.000000e+00, <2 x double> undef)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %fadd_v4f64 = call fast double @llvm.vector.reduce.fadd.v4f64(double 0.000000e+00, <4 x double> undef)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %fadd_v4f64_reassoc = call reassoc double @llvm.vector.reduce.fadd.v4f64(double 0.000000e+00, <4 x double> undef)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 4 for instruction: %fadd_v7f64 = call fast double @llvm.vector.reduce.fadd.v7f64(double 0.000000e+00, <7 x double> undef)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 8 for instruction: %fadd_v9f64_reassoc = call reassoc double @llvm.vector.reduce.fadd.v9f64(double 0.000000e+00, <9 x double> undef)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %fadd_v4f8 = call reassoc bfloat @llvm.vector.reduce.fadd.v4bf16(bfloat 0xR8000, <4 x bfloat> undef)
; CHECK-NEXT: Cost Model: Found an estimated cost of 12 for instruction: %fadd_v4f128 = call reassoc fp128 @llvm.vector.reduce.fadd.v4f128(fp128 undef, <4 x fp128> undef)
; CHECK-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret void
;
; FP16-LABEL: 'fast_fp_reductions'
-; FP16-NEXT: Cost Model: Found an estimated cost of 4 for instruction: %fadd_v2f16_fast = call fast half @llvm.vector.reduce.fadd.v2f16(half 0xH0000, <2 x half> undef)
-; FP16-NEXT: Cost Model: Found an estimated cost of 4 for instruction: %fadd_v2f16_reassoc = call reassoc half @llvm.vector.reduce.fadd.v2f16(half 0xH0000, <2 x half> undef)
-; FP16-NEXT: Cost Model: Found an estimated cost of 8 for instruction: %fadd_v4f16_fast = call fast half @llvm.vector.reduce.fadd.v4f16(half 0xH0000, <4 x half> undef)
-; FP16-NEXT: Cost Model: Found an estimated cost of 8 for instruction: %fadd_v4f16_reassoc = call reassoc half @llvm.vector.reduce.fadd.v4f16(half 0xH0000, <4 x half> undef)
-; FP16-NEXT: Cost Model: Found an estimated cost of 27 for instruction: %fadd_v8f16 = call fast half @llvm.vector.reduce.fadd.v8f16(half 0xH0000, <8 x half> undef)
-; FP16-NEXT: Cost Model: Found an estimated cost of 27 for instruction: %fadd_v8f16_reassoc = call reassoc half @llvm.vector.reduce.fadd.v8f16(half 0xH0000, <8 x half> undef)
-; FP16-NEXT: Cost Model: Found an estimated cost of 44 for instruction: %fadd_v16f16 = call fast half @llvm.vector.reduce.fadd.v16f16(half 0xH0000, <16 x half> undef)
-; FP16-NEXT: Cost Model: Found an estimated cost of 44 for instruction: %fadd_v16f16_reassoc = call reassoc half @llvm.vector.reduce.fadd.v16f16(half 0xH0000, <16 x half> undef)
-; FP16-NEXT: Cost Model: Found an estimated cost of 35 for instruction: %fadd_v11f16 = call fast half @llvm.vector.reduce.fadd.v11f16(half 0xH0000, <11 x half> undef)
-; FP16-NEXT: Cost Model: Found an estimated cost of 35 for instruction: %fadd_v13f16_reassoc = call reassoc half @llvm.vector.reduce.fadd.v13f16(half 0xH0000, <13 x half> undef)
-; FP16-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %fadd_v2f32 = call fast float @llvm.vector.reduce.fadd.v2f32(float 0.000000e+00, <2 x float> undef)
-; FP16-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %fadd_v2f32_reassoc = call reassoc float @llvm.vector.reduce.fadd.v2f32(float 0.000000e+00, <2 x float> undef)
-; FP16-NEXT: Cost Model: Found an estimated cost of 8 for instruction: %fadd_v4f32 = call fast float @llvm.vector.reduce.fadd.v4f32(float 0.000000e+00, <4 x float> undef)
-; FP16-NEXT: Cost Model: Found an estimated cost of 8 for instruction: %fadd_v4f32_reassoc = call reassoc float @llvm.vector.reduce.fadd.v4f32(float 0.000000e+00, <4 x float> undef)
-; FP16-NEXT: Cost Model: Found an estimated cost of 15 for instruction: %fadd_v8f32 = call fast float @llvm.vector.reduce.fadd.v8f32(float 0.000000e+00, <8 x float> undef)
-; FP16-NEXT: Cost Model: Found an estimated cost of 15 for instruction: %fadd_v8f32_reassoc = call reassoc float @llvm.vector.reduce.fadd.v8f32(float 0.000000e+00, <8 x float> undef)
-; FP16-NEXT: Cost Model: Found an estimated cost of 25 for instruction: %fadd_v13f32 = call fast float @llvm.vector.reduce.fadd.v13f32(float 0.000000e+00, <13 x float> undef)
-; FP16-NEXT: Cost Model: Found an estimated cost of 9 for instruction: %fadd_v5f32_reassoc = call reassoc float @llvm.vector.reduce.fadd.v5f32(float 0.000000e+00, <5 x float> undef)
-; FP16-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %fadd_v2f64 = call fast double @llvm.vector.reduce.fadd.v2f64(double 0.000000e+00, <2 x double> undef)
-; FP16-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %fadd_v2f64_reassoc = call reassoc double @llvm.vector.reduce.fadd.v2f64(double 0.000000e+00, <2 x double> undef)
-; FP16-NEXT: Cost Model: Found an estimated cost of 5 for instruction: %fadd_v4f64 = call fast double @llvm.vector.reduce.fadd.v4f64(double 0.000000e+00, <4 x double> undef)
-; FP16-NEXT: Cost Model: Found an estimated cost of 5 for instruction: %fadd_v4f64_reassoc = call reassoc double @llvm.vector.reduce.fadd.v4f64(double 0.000000e+00, <4 x double> undef)
-; FP16-NEXT: Cost Model: Found an estimated cost of 9 for instruction: %fadd_v7f64 = call fast double @llvm.vector.reduce.fadd.v7f64(double 0.000000e+00, <7 x double> undef)
-; FP16-NEXT: Cost Model: Found an estimated cost of 15 for instruction: %fadd_v9f64_reassoc = call reassoc double @llvm.vector.reduce.fadd.v9f64(double 0.000000e+00, <9 x double> undef)
-; FP16-NEXT: Cost Model: Found an estimated cost of 10 for instruction: %fadd_v4f8 = call reassoc bfloat @llvm.vector.reduce.fadd.v4bf16(bfloat 0xR8000, <4 x bfloat> undef)
+; FP16-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %fadd_v2f16_fast = call fast half @llvm.vector.reduce.fadd.v2f16(half 0xH0000, <2 x half> undef)
+; FP16-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %fadd_v2f16_reassoc = call reassoc half @llvm.vector.reduce.fadd.v2f16(half 0xH0000, <2 x half> undef)
+; FP16-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %fadd_v4f16_fast = call fast half @llvm.vector.reduce.fadd.v4f16(half 0xH0000, <4 x half> undef)
+; FP16-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %fadd_v4f16_reassoc = call reassoc half @llvm.vector.reduce.fadd.v4f16(half 0xH0000, <4 x half> undef)
+; FP16-NEXT: Cost Model: Found an estimated cost of 3 for instruction: %fadd_v8f16 = call fast half @llvm.vector.reduce.fadd.v8f16(half 0xH0000, <8 x half> undef)
+; FP16-NEXT: Cost Model: Found an estimated cost of 3 for instruction: %fadd_v8f16_reassoc = call reassoc half @llvm.vector.reduce.fadd.v8f16(half 0xH0000, <8 x half> undef)
+; FP16-NEXT: Cost Model: Found an estimated cost of 4 for instruction: %fadd_v16f16 = call fast half @llvm.vector.reduce.fadd.v16f16(half 0xH0000, <16 x half> undef)
+; FP16-NEXT: Cost Model: Found an estimated cost of 4 for instruction: %fadd_v16f16_reassoc = call reassoc half @llvm.vector.reduce.fadd.v16f16(half 0xH0000, <16 x half> undef)
+; FP16-NEXT: Cost Model: Found an estimated cost of 4 for instruction: %fadd_v11f16 = call fast half @llvm.vector.reduce.fadd.v11f16(half 0xH0000, <11 x half> undef)
+; FP16-NEXT: Cost Model: Found an estimated cost of 4 for instruction: %fadd_v13f16_reassoc = call reassoc half @llvm.vector.reduce.fadd.v13f16(half 0xH0000, <13 x half> undef)
+; FP16-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %fadd_v2f32 = call fast float @llvm.vector.reduce.fadd.v2f32(float 0.000000e+00, <2 x float> undef)
+; FP16-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %fadd_v2f32_reassoc = call reassoc float @llvm.vector.reduce.fadd.v2f32(float 0.000000e+00, <2 x float> undef)
+; FP16-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %fadd_v4f32 = call fast float @llvm.vector.reduce.fadd.v4f32(float 0.000000e+00, <4 x float> undef)
+; FP16-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %fadd_v4f32_reassoc = call reassoc float @llvm.vector.reduce.fadd.v4f32(float 0.000000e+00, <4 x float> undef)
+; FP16-NEXT: Cost Model: Found an estimated cost of 3 for instruction: %fadd_v8f32 = call fast float @llvm.vector.reduce.fadd.v8f32(float 0.000000e+00, <8 x float> undef)
+; FP16-NEXT: Cost Model: Found an estimated cost of 3 for instruction: %fadd_v8f32_reassoc = call reassoc float @llvm.vector.reduce.fadd.v8f32(float 0.000000e+00, <8 x float> undef)
+; FP16-NEXT: Cost Model: Found an estimated cost of 5 for instruction: %fadd_v13f32 = call fast float @llvm.vector.reduce.fadd.v13f32(float 0.000000e+00, <13 x float> undef)
+; FP16-NEXT: Cost Model: Found an estimated cost of 3 for instruction: %fadd_v5f32_reassoc = call reassoc float @llvm.vector.reduce.fadd.v5f32(float 0.000000e+00, <5 x float> undef)
+; FP16-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %fadd_v2f64 = call fast double @llvm.vector.reduce.fadd.v2f64(double 0.000000e+00, <2 x double> undef)
+; FP16-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %fadd_v2f64_reassoc = call reassoc double @llvm.vector.reduce.fadd.v2f64(double 0.000000e+00, <2 x double> undef)
+; FP16-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %fadd_v4f64 = call fast double @llvm.vector.reduce.fadd.v4f64(double 0.000000e+00, <4 x double> undef)
+; FP16-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %fadd_v4f64_reassoc = call reassoc double @llvm.vector.reduce.fadd.v4f64(double 0.000000e+00, <4 x double> undef)
+; FP16-NEXT: Cost Model: Found an estimated cost of 4 for instruction: %fadd_v7f64 = call fast double @llvm.vector.reduce.fadd.v7f64(double 0.000000e+00, <7 x double> undef)
+; FP16-NEXT: Cost Model: Found an estimated cost of 8 for instruction: %fadd_v9f64_reassoc = call reassoc double @llvm.vector.reduce.fadd.v9f64(double 0.000000e+00, <9 x double> undef)
+; FP16-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %fadd_v4f8 = call reassoc bfloat @llvm.vector.reduce.fadd.v4bf16(bfloat 0xR8000, <4 x bfloat> undef)
; FP16-NEXT: Cost Model: Found an estimated cost of 12 for instruction: %fadd_v4f128 = call reassoc fp128 @llvm.vector.reduce.fadd.v4f128(fp128 undef, <4 x fp128> undef)
; FP16-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret void
;
; BF16-LABEL: 'fast_fp_reductions'
-; BF16-NEXT: Cost Model: Found an estimated cost of 5 for instruction: %fadd_v2f16_fast = call fast half @llvm.vector.reduce.fadd.v2f16(half 0xH0000, <2 x half> undef)
-; BF16-NEXT: Cost Model: Found an estimated cost of 5 for instruction: %fadd_v2f16_reassoc = call reassoc half @llvm.vector.reduce.fadd.v2f16(half 0xH0000, <2 x half> undef)
-; BF16-NEXT: Cost Model: Found an estimated cost of...
[truncated]
``````````
</details>
https://github.com/llvm/llvm-project/pull/108791
More information about the llvm-commits
mailing list