[LLVM][CodeGen][SME] Only emit strided loads in streaming mode. #150445
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@llvm/pr-subscribers-backend-aarch64 Author: Paul Walker (paulwalker-arm) ChangesThe selection code for aarch64_sve_ld[nt]1_pn_x{2,4} intrinsics gates the use of strided load instructions behind the SME2 target feature. However, the instructions are only available in streaming mode. Full diff: https://github.com/llvm/llvm-project/pull/150445.diff 2 Files Affected:
diff --git a/llvm/lib/Target/AArch64/AArch64ISelDAGToDAG.cpp b/llvm/lib/Target/AArch64/AArch64ISelDAGToDAG.cpp
index eca7ca566cfc2..ad42f4b56caf2 100644
--- a/llvm/lib/Target/AArch64/AArch64ISelDAGToDAG.cpp
+++ b/llvm/lib/Target/AArch64/AArch64ISelDAGToDAG.cpp
@@ -5296,7 +5296,7 @@ void AArch64DAGToDAGISel::Select(SDNode *Node) {
}
case Intrinsic::aarch64_sve_ld1_pn_x2: {
if (VT == MVT::nxv16i8) {
- if (Subtarget->hasSME2())
+ if (Subtarget->hasSME2() && Subtarget->isStreaming())
SelectContiguousMultiVectorLoad(
Node, 2, 0, AArch64::LD1B_2Z_IMM_PSEUDO, AArch64::LD1B_2Z_PSEUDO);
else if (Subtarget->hasSVE2p1())
@@ -5307,7 +5307,7 @@ void AArch64DAGToDAGISel::Select(SDNode *Node) {
return;
} else if (VT == MVT::nxv8i16 || VT == MVT::nxv8f16 ||
VT == MVT::nxv8bf16) {
- if (Subtarget->hasSME2())
+ if (Subtarget->hasSME2() && Subtarget->isStreaming())
SelectContiguousMultiVectorLoad(
Node, 2, 1, AArch64::LD1H_2Z_IMM_PSEUDO, AArch64::LD1H_2Z_PSEUDO);
else if (Subtarget->hasSVE2p1())
@@ -5317,7 +5317,7 @@ void AArch64DAGToDAGISel::Select(SDNode *Node) {
break;
return;
} else if (VT == MVT::nxv4i32 || VT == MVT::nxv4f32) {
- if (Subtarget->hasSME2())
+ if (Subtarget->hasSME2() && Subtarget->isStreaming())
SelectContiguousMultiVectorLoad(
Node, 2, 2, AArch64::LD1W_2Z_IMM_PSEUDO, AArch64::LD1W_2Z_PSEUDO);
else if (Subtarget->hasSVE2p1())
@@ -5327,7 +5327,7 @@ void AArch64DAGToDAGISel::Select(SDNode *Node) {
break;
return;
} else if (VT == MVT::nxv2i64 || VT == MVT::nxv2f64) {
- if (Subtarget->hasSME2())
+ if (Subtarget->hasSME2() && Subtarget->isStreaming())
SelectContiguousMultiVectorLoad(
Node, 2, 3, AArch64::LD1D_2Z_IMM_PSEUDO, AArch64::LD1D_2Z_PSEUDO);
else if (Subtarget->hasSVE2p1())
@@ -5341,7 +5341,7 @@ void AArch64DAGToDAGISel::Select(SDNode *Node) {
}
case Intrinsic::aarch64_sve_ld1_pn_x4: {
if (VT == MVT::nxv16i8) {
- if (Subtarget->hasSME2())
+ if (Subtarget->hasSME2() && Subtarget->isStreaming())
SelectContiguousMultiVectorLoad(
Node, 4, 0, AArch64::LD1B_4Z_IMM_PSEUDO, AArch64::LD1B_4Z_PSEUDO);
else if (Subtarget->hasSVE2p1())
@@ -5352,7 +5352,7 @@ void AArch64DAGToDAGISel::Select(SDNode *Node) {
return;
} else if (VT == MVT::nxv8i16 || VT == MVT::nxv8f16 ||
VT == MVT::nxv8bf16) {
- if (Subtarget->hasSME2())
+ if (Subtarget->hasSME2() && Subtarget->isStreaming())
SelectContiguousMultiVectorLoad(
Node, 4, 1, AArch64::LD1H_4Z_IMM_PSEUDO, AArch64::LD1H_4Z_PSEUDO);
else if (Subtarget->hasSVE2p1())
@@ -5362,7 +5362,7 @@ void AArch64DAGToDAGISel::Select(SDNode *Node) {
break;
return;
} else if (VT == MVT::nxv4i32 || VT == MVT::nxv4f32) {
- if (Subtarget->hasSME2())
+ if (Subtarget->hasSME2() && Subtarget->isStreaming())
SelectContiguousMultiVectorLoad(
Node, 4, 2, AArch64::LD1W_4Z_IMM_PSEUDO, AArch64::LD1W_4Z_PSEUDO);
else if (Subtarget->hasSVE2p1())
@@ -5372,7 +5372,7 @@ void AArch64DAGToDAGISel::Select(SDNode *Node) {
break;
return;
} else if (VT == MVT::nxv2i64 || VT == MVT::nxv2f64) {
- if (Subtarget->hasSME2())
+ if (Subtarget->hasSME2() && Subtarget->isStreaming())
SelectContiguousMultiVectorLoad(
Node, 4, 3, AArch64::LD1D_4Z_IMM_PSEUDO, AArch64::LD1D_4Z_PSEUDO);
else if (Subtarget->hasSVE2p1())
@@ -5386,7 +5386,7 @@ void AArch64DAGToDAGISel::Select(SDNode *Node) {
}
case Intrinsic::aarch64_sve_ldnt1_pn_x2: {
if (VT == MVT::nxv16i8) {
- if (Subtarget->hasSME2())
+ if (Subtarget->hasSME2() && Subtarget->isStreaming())
SelectContiguousMultiVectorLoad(Node, 2, 0,
AArch64::LDNT1B_2Z_IMM_PSEUDO,
AArch64::LDNT1B_2Z_PSEUDO);
@@ -5398,7 +5398,7 @@ void AArch64DAGToDAGISel::Select(SDNode *Node) {
return;
} else if (VT == MVT::nxv8i16 || VT == MVT::nxv8f16 ||
VT == MVT::nxv8bf16) {
- if (Subtarget->hasSME2())
+ if (Subtarget->hasSME2() && Subtarget->isStreaming())
SelectContiguousMultiVectorLoad(Node, 2, 1,
AArch64::LDNT1H_2Z_IMM_PSEUDO,
AArch64::LDNT1H_2Z_PSEUDO);
@@ -5409,7 +5409,7 @@ void AArch64DAGToDAGISel::Select(SDNode *Node) {
break;
return;
} else if (VT == MVT::nxv4i32 || VT == MVT::nxv4f32) {
- if (Subtarget->hasSME2())
+ if (Subtarget->hasSME2() && Subtarget->isStreaming())
SelectContiguousMultiVectorLoad(Node, 2, 2,
AArch64::LDNT1W_2Z_IMM_PSEUDO,
AArch64::LDNT1W_2Z_PSEUDO);
@@ -5420,7 +5420,7 @@ void AArch64DAGToDAGISel::Select(SDNode *Node) {
break;
return;
} else if (VT == MVT::nxv2i64 || VT == MVT::nxv2f64) {
- if (Subtarget->hasSME2())
+ if (Subtarget->hasSME2() && Subtarget->isStreaming())
SelectContiguousMultiVectorLoad(Node, 2, 3,
AArch64::LDNT1D_2Z_IMM_PSEUDO,
AArch64::LDNT1D_2Z_PSEUDO);
@@ -5435,7 +5435,7 @@ void AArch64DAGToDAGISel::Select(SDNode *Node) {
}
case Intrinsic::aarch64_sve_ldnt1_pn_x4: {
if (VT == MVT::nxv16i8) {
- if (Subtarget->hasSME2())
+ if (Subtarget->hasSME2() && Subtarget->isStreaming())
SelectContiguousMultiVectorLoad(Node, 4, 0,
AArch64::LDNT1B_4Z_IMM_PSEUDO,
AArch64::LDNT1B_4Z_PSEUDO);
@@ -5447,7 +5447,7 @@ void AArch64DAGToDAGISel::Select(SDNode *Node) {
return;
} else if (VT == MVT::nxv8i16 || VT == MVT::nxv8f16 ||
VT == MVT::nxv8bf16) {
- if (Subtarget->hasSME2())
+ if (Subtarget->hasSME2() && Subtarget->isStreaming())
SelectContiguousMultiVectorLoad(Node, 4, 1,
AArch64::LDNT1H_4Z_IMM_PSEUDO,
AArch64::LDNT1H_4Z_PSEUDO);
@@ -5458,7 +5458,7 @@ void AArch64DAGToDAGISel::Select(SDNode *Node) {
break;
return;
} else if (VT == MVT::nxv4i32 || VT == MVT::nxv4f32) {
- if (Subtarget->hasSME2())
+ if (Subtarget->hasSME2() && Subtarget->isStreaming())
SelectContiguousMultiVectorLoad(Node, 4, 2,
AArch64::LDNT1W_4Z_IMM_PSEUDO,
AArch64::LDNT1W_4Z_PSEUDO);
@@ -5469,7 +5469,7 @@ void AArch64DAGToDAGISel::Select(SDNode *Node) {
break;
return;
} else if (VT == MVT::nxv2i64 || VT == MVT::nxv2f64) {
- if (Subtarget->hasSME2())
+ if (Subtarget->hasSME2() && Subtarget->isStreaming())
SelectContiguousMultiVectorLoad(Node, 4, 3,
AArch64::LDNT1D_4Z_IMM_PSEUDO,
AArch64::LDNT1D_4Z_PSEUDO);
diff --git a/llvm/test/CodeGen/AArch64/sme2-intrinsics-ld1.ll b/llvm/test/CodeGen/AArch64/sme2-intrinsics-ld1.ll
index c63899cf7d257..19ac03d1200b7 100644
--- a/llvm/test/CodeGen/AArch64/sme2-intrinsics-ld1.ll
+++ b/llvm/test/CodeGen/AArch64/sme2-intrinsics-ld1.ll
@@ -1,6 +1,7 @@
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc -mtriple=aarch64-linux-gnu -mattr=+sme2 -force-streaming -verify-machineinstrs < %s | FileCheck %s --check-prefixes=STRIDED
; RUN: llc -mtriple=aarch64-linux-gnu -mattr=+sve2p1 -verify-machineinstrs < %s | FileCheck %s --check-prefixes=CONTIGUOUS
+; RUN: llc -mtriple=aarch64-linux-gnu -mattr=+sve2p1,+sme2 -verify-machineinstrs < %s | FileCheck %s --check-prefixes=CONTIGUOUS
define <vscale x 32 x i8> @ld1_x2_i8_z0_z8(<vscale x 16 x i8> %unused, <vscale x 16 x i8> %z1, target("aarch64.svcount") %pn, ptr %ptr) nounwind {
; CHECK-LABEL: ld1_x2_i8_z0_z8:
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paulwalker-arm
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paulwalker-arm
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Should this line be added to sme2-intrinsics-ldnt1.ll as well?
The selection code for aarch64_sve_ld[nt]1_pn_x{2,4} intrinsics gates
the use of strided load instructions behind the SME2 target feature.
However, the instructions are only available in streaming mode.
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kmclaughlin-arm
approved these changes
Jul 29, 2025
sdesmalen-arm
approved these changes
Jul 30, 2025
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The selection code for aarch64_sve_ld[nt]1_pn_x{2,4} intrinsics gates the use of strided load instructions behind the SME2 target feature. However, the instructions are only available in streaming mode.