diff --git a/llvm/lib/Target/AArch64/AArch64TargetTransformInfo.h b/llvm/lib/Target/AArch64/AArch64TargetTransformInfo.h --- a/llvm/lib/Target/AArch64/AArch64TargetTransformInfo.h +++ b/llvm/lib/Target/AArch64/AArch64TargetTransformInfo.h @@ -280,6 +280,23 @@ return isLegalMaskedGatherScatter(DataType); } + bool isLegalBroadcastLoad(Type *ElementTy, ElementCount NumElements) const { + // Return true if we can generate a `ld1r` splat load instruction. + if (!ST->hasNEON() || NumElements.isScalable()) + return false; + switch (unsigned ElementBits = ElementTy->getScalarSizeInBits()) { + case 8: + case 16: + case 32: + case 64: { + // We accept bit-widths >= 64bits and elements {8,16,32,64} bits. + unsigned VectorBits = NumElements.getFixedValue() * ElementBits; + return VectorBits >= 64; + } + } + return false; + } + bool isLegalNTStore(Type *DataType, Align Alignment) { // NOTE: The logic below is mostly geared towards LV, which calls it with // vectors with 2 elements. We might want to improve that, if other diff --git a/llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp b/llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp --- a/llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp +++ b/llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp @@ -2606,6 +2606,20 @@ if (Kind == TTI::SK_Broadcast || Kind == TTI::SK_Transpose || Kind == TTI::SK_Select || Kind == TTI::SK_PermuteSingleSrc || Kind == TTI::SK_Reverse) { + + // Check for broadcast loads. + if (Kind == TTI::SK_Broadcast) { + bool IsLoad = !Args.empty() && llvm::all_of(Args, [](const Value *V) { + return isa(V); + }); + if (IsLoad) { + assert(isLegalBroadcastLoad(Tp->getElementType(), + LT.second.getVectorElementCount()) && + "Expected this to be accepted by isLegalBroadcastLoad()"); + return 0; // broadcast is handled by ld1r + } + } + static const CostTblEntry ShuffleTbl[] = { // Broadcast shuffle kinds can be performed with 'dup'. { TTI::SK_Broadcast, MVT::v8i8, 1 }, diff --git a/llvm/test/Transforms/SLPVectorizer/AArch64/splat-loads.ll b/llvm/test/Transforms/SLPVectorizer/AArch64/splat-loads.ll --- a/llvm/test/Transforms/SLPVectorizer/AArch64/splat-loads.ll +++ b/llvm/test/Transforms/SLPVectorizer/AArch64/splat-loads.ll @@ -10,21 +10,21 @@ ; CHECK-NEXT: entry: ; CHECK-NEXT: [[GEP_1_0:%.*]] = getelementptr inbounds double, double* [[ARRAY1:%.*]], i64 0 ; CHECK-NEXT: [[GEP_2_0:%.*]] = getelementptr inbounds double, double* [[ARRAY2:%.*]], i64 0 +; CHECK-NEXT: [[GEP_2_1:%.*]] = getelementptr inbounds double, double* [[ARRAY2]], i64 1 +; CHECK-NEXT: [[LD_2_0:%.*]] = load double, double* [[GEP_2_0]], align 8 +; CHECK-NEXT: [[LD_2_1:%.*]] = load double, double* [[GEP_2_1]], align 8 ; CHECK-NEXT: [[TMP0:%.*]] = bitcast double* [[GEP_1_0]] to <2 x double>* ; CHECK-NEXT: [[TMP1:%.*]] = load <2 x double>, <2 x double>* [[TMP0]], align 8 -; CHECK-NEXT: [[TMP2:%.*]] = bitcast double* [[GEP_2_0]] to <2 x double>* -; CHECK-NEXT: [[TMP3:%.*]] = load <2 x double>, <2 x double>* [[TMP2]], align 8 -; CHECK-NEXT: [[SHUFFLE:%.*]] = shufflevector <2 x double> [[TMP3]], <2 x double> poison, <2 x i32> -; CHECK-NEXT: [[TMP4:%.*]] = fmul <2 x double> [[TMP1]], [[SHUFFLE]] -; CHECK-NEXT: [[TMP5:%.*]] = extractelement <2 x double> [[SHUFFLE]], i32 1 -; CHECK-NEXT: [[TMP6:%.*]] = insertelement <2 x double> poison, double [[TMP5]], i32 0 -; CHECK-NEXT: [[TMP7:%.*]] = extractelement <2 x double> [[SHUFFLE]], i32 0 -; CHECK-NEXT: [[TMP8:%.*]] = insertelement <2 x double> [[TMP6]], double [[TMP7]], i32 1 -; CHECK-NEXT: [[TMP9:%.*]] = fmul <2 x double> [[TMP1]], [[TMP8]] -; CHECK-NEXT: [[TMP10:%.*]] = fadd <2 x double> [[TMP4]], [[TMP9]] -; CHECK-NEXT: [[TMP11:%.*]] = extractelement <2 x double> [[TMP10]], i32 0 -; CHECK-NEXT: [[TMP12:%.*]] = extractelement <2 x double> [[TMP10]], i32 1 -; CHECK-NEXT: [[ADD3:%.*]] = fadd double [[TMP11]], [[TMP12]] +; CHECK-NEXT: [[TMP2:%.*]] = insertelement <2 x double> poison, double [[LD_2_0]], i32 0 +; CHECK-NEXT: [[TMP3:%.*]] = insertelement <2 x double> [[TMP2]], double [[LD_2_0]], i32 1 +; CHECK-NEXT: [[TMP4:%.*]] = fmul <2 x double> [[TMP1]], [[TMP3]] +; CHECK-NEXT: [[TMP5:%.*]] = insertelement <2 x double> poison, double [[LD_2_1]], i32 0 +; CHECK-NEXT: [[TMP6:%.*]] = insertelement <2 x double> [[TMP5]], double [[LD_2_1]], i32 1 +; CHECK-NEXT: [[TMP7:%.*]] = fmul <2 x double> [[TMP1]], [[TMP6]] +; CHECK-NEXT: [[TMP8:%.*]] = fadd <2 x double> [[TMP4]], [[TMP7]] +; CHECK-NEXT: [[TMP9:%.*]] = extractelement <2 x double> [[TMP8]], i32 0 +; CHECK-NEXT: [[TMP10:%.*]] = extractelement <2 x double> [[TMP8]], i32 1 +; CHECK-NEXT: [[ADD3:%.*]] = fadd double [[TMP9]], [[TMP10]] ; CHECK-NEXT: ret double [[ADD3]] ; entry: