[llvm-branch-commits] [llvm] [SelectionDAG][X86] Split via Concat <n x T> vector types for atomic load (PR #120640)
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Fri Apr 25 21:07:08 PDT 2025
https://github.com/jofrn updated https://github.com/llvm/llvm-project/pull/120640
>From 7565845a3dd33fc1df7a771b165fbf095145f9d6 Mon Sep 17 00:00:00 2001
From: jofrn <jofernau at amd.com>
Date: Thu, 19 Dec 2024 16:25:55 -0500
Subject: [PATCH] [SelectionDAG][X86] Split via Concat <n x T> vector types for
atomic load
Vector types that aren't widened are 'split' via CONCAT_VECTORS
so that a single ATOMIC_LOAD is issued for the entire vector at once.
This change utilizes the load vectorization infrastructure in
SelectionDAG in order to group the vectors. This enables SelectionDAG
to translate vectors with type bfloat,half.
commit-id:3a045357
---
llvm/lib/CodeGen/SelectionDAG/LegalizeTypes.h | 1 +
.../SelectionDAG/LegalizeVectorTypes.cpp | 33 ++++
llvm/test/CodeGen/X86/atomic-load-store.ll | 171 ++++++++++++++++++
3 files changed, 205 insertions(+)
diff --git a/llvm/lib/CodeGen/SelectionDAG/LegalizeTypes.h b/llvm/lib/CodeGen/SelectionDAG/LegalizeTypes.h
index bdfa5f7741ad3..7905f5a94c579 100644
--- a/llvm/lib/CodeGen/SelectionDAG/LegalizeTypes.h
+++ b/llvm/lib/CodeGen/SelectionDAG/LegalizeTypes.h
@@ -960,6 +960,7 @@ class LLVM_LIBRARY_VISIBILITY DAGTypeLegalizer {
void SplitVecRes_FPOp_MultiType(SDNode *N, SDValue &Lo, SDValue &Hi);
void SplitVecRes_IS_FPCLASS(SDNode *N, SDValue &Lo, SDValue &Hi);
void SplitVecRes_INSERT_VECTOR_ELT(SDNode *N, SDValue &Lo, SDValue &Hi);
+ void SplitVecRes_ATOMIC_LOAD(AtomicSDNode *LD);
void SplitVecRes_LOAD(LoadSDNode *LD, SDValue &Lo, SDValue &Hi);
void SplitVecRes_VP_LOAD(VPLoadSDNode *LD, SDValue &Lo, SDValue &Hi);
void SplitVecRes_VP_STRIDED_LOAD(VPStridedLoadSDNode *SLD, SDValue &Lo,
diff --git a/llvm/lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp b/llvm/lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp
index 328859738cae0..983958703be51 100644
--- a/llvm/lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp
@@ -1173,6 +1173,9 @@ void DAGTypeLegalizer::SplitVectorResult(SDNode *N, unsigned ResNo) {
SplitVecRes_STEP_VECTOR(N, Lo, Hi);
break;
case ISD::SIGN_EXTEND_INREG: SplitVecRes_InregOp(N, Lo, Hi); break;
+ case ISD::ATOMIC_LOAD:
+ SplitVecRes_ATOMIC_LOAD(cast<AtomicSDNode>(N));
+ break;
case ISD::LOAD:
SplitVecRes_LOAD(cast<LoadSDNode>(N), Lo, Hi);
break;
@@ -1423,6 +1426,36 @@ void DAGTypeLegalizer::SplitVectorResult(SDNode *N, unsigned ResNo) {
SetSplitVector(SDValue(N, ResNo), Lo, Hi);
}
+void DAGTypeLegalizer::SplitVecRes_ATOMIC_LOAD(AtomicSDNode *LD) {
+ SDLoc dl(LD);
+
+ EVT MemoryVT = LD->getMemoryVT();
+ unsigned NumElts = MemoryVT.getVectorMinNumElements();
+
+ EVT IntMemoryVT = EVT::getVectorVT(*DAG.getContext(), MVT::i16, NumElts);
+ EVT ElemVT =
+ EVT::getVectorVT(*DAG.getContext(), MemoryVT.getVectorElementType(), 1);
+
+ // Create a single atomic to load all the elements at once.
+ SDValue Atomic =
+ DAG.getAtomicLoad(ISD::NON_EXTLOAD, dl, IntMemoryVT, IntMemoryVT,
+ LD->getChain(), LD->getBasePtr(),
+ LD->getMemOperand());
+
+ // Instead of splitting, put all the elements back into a vector.
+ SmallVector<SDValue, 4> Ops;
+ for (unsigned i = 0; i < NumElts; ++i) {
+ SDValue Elt = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, MVT::i16, Atomic,
+ DAG.getVectorIdxConstant(i, dl));
+ Elt = DAG.getBitcast(ElemVT, Elt);
+ Ops.push_back(Elt);
+ }
+ SDValue Concat = DAG.getNode(ISD::CONCAT_VECTORS, dl, MemoryVT, Ops);
+
+ ReplaceValueWith(SDValue(LD, 0), Concat);
+ ReplaceValueWith(SDValue(LD, 1), LD->getChain());
+}
+
void DAGTypeLegalizer::IncrementPointer(MemSDNode *N, EVT MemVT,
MachinePointerInfo &MPI, SDValue &Ptr,
uint64_t *ScaledOffset) {
diff --git a/llvm/test/CodeGen/X86/atomic-load-store.ll b/llvm/test/CodeGen/X86/atomic-load-store.ll
index 935d058a52f8f..42b0955824293 100644
--- a/llvm/test/CodeGen/X86/atomic-load-store.ll
+++ b/llvm/test/CodeGen/X86/atomic-load-store.ll
@@ -204,6 +204,68 @@ define <2 x float> @atomic_vec2_float_align(ptr %x) {
ret <2 x float> %ret
}
+define <2 x half> @atomic_vec2_half(ptr %x) {
+; CHECK3-LABEL: atomic_vec2_half:
+; CHECK3: ## %bb.0:
+; CHECK3-NEXT: movl (%rdi), %eax
+; CHECK3-NEXT: pinsrw $0, %eax, %xmm0
+; CHECK3-NEXT: shrl $16, %eax
+; CHECK3-NEXT: pinsrw $0, %eax, %xmm1
+; CHECK3-NEXT: punpcklwd {{.*#+}} xmm0 = xmm0[0],xmm1[0],xmm0[1],xmm1[1],xmm0[2],xmm1[2],xmm0[3],xmm1[3]
+; CHECK3-NEXT: retq
+;
+; CHECK0-LABEL: atomic_vec2_half:
+; CHECK0: ## %bb.0:
+; CHECK0-NEXT: movl (%rdi), %eax
+; CHECK0-NEXT: movl %eax, %ecx
+; CHECK0-NEXT: shrl $16, %ecx
+; CHECK0-NEXT: movw %cx, %dx
+; CHECK0-NEXT: ## implicit-def: $ecx
+; CHECK0-NEXT: movw %dx, %cx
+; CHECK0-NEXT: ## implicit-def: $xmm1
+; CHECK0-NEXT: pinsrw $0, %ecx, %xmm1
+; CHECK0-NEXT: movw %ax, %cx
+; CHECK0-NEXT: ## implicit-def: $eax
+; CHECK0-NEXT: movw %cx, %ax
+; CHECK0-NEXT: ## implicit-def: $xmm0
+; CHECK0-NEXT: pinsrw $0, %eax, %xmm0
+; CHECK0-NEXT: punpcklwd {{.*#+}} xmm0 = xmm0[0],xmm1[0],xmm0[1],xmm1[1],xmm0[2],xmm1[2],xmm0[3],xmm1[3]
+; CHECK0-NEXT: retq
+ %ret = load atomic <2 x half>, ptr %x acquire, align 4
+ ret <2 x half> %ret
+}
+
+define <2 x bfloat> @atomic_vec2_bfloat(ptr %x) {
+; CHECK3-LABEL: atomic_vec2_bfloat:
+; CHECK3: ## %bb.0:
+; CHECK3-NEXT: movl (%rdi), %eax
+; CHECK3-NEXT: pinsrw $0, %eax, %xmm0
+; CHECK3-NEXT: shrl $16, %eax
+; CHECK3-NEXT: pinsrw $0, %eax, %xmm1
+; CHECK3-NEXT: punpcklwd {{.*#+}} xmm0 = xmm0[0],xmm1[0],xmm0[1],xmm1[1],xmm0[2],xmm1[2],xmm0[3],xmm1[3]
+; CHECK3-NEXT: retq
+;
+; CHECK0-LABEL: atomic_vec2_bfloat:
+; CHECK0: ## %bb.0:
+; CHECK0-NEXT: movl (%rdi), %eax
+; CHECK0-NEXT: movl %eax, %ecx
+; CHECK0-NEXT: shrl $16, %ecx
+; CHECK0-NEXT: ## kill: def $cx killed $cx killed $ecx
+; CHECK0-NEXT: movw %ax, %dx
+; CHECK0-NEXT: ## implicit-def: $eax
+; CHECK0-NEXT: movw %dx, %ax
+; CHECK0-NEXT: ## implicit-def: $xmm0
+; CHECK0-NEXT: pinsrw $0, %eax, %xmm0
+; CHECK0-NEXT: ## implicit-def: $eax
+; CHECK0-NEXT: movw %cx, %ax
+; CHECK0-NEXT: ## implicit-def: $xmm1
+; CHECK0-NEXT: pinsrw $0, %eax, %xmm1
+; CHECK0-NEXT: punpcklwd {{.*#+}} xmm0 = xmm0[0],xmm1[0],xmm0[1],xmm1[1],xmm0[2],xmm1[2],xmm0[3],xmm1[3]
+; CHECK0-NEXT: retq
+ %ret = load atomic <2 x bfloat>, ptr %x acquire, align 4
+ ret <2 x bfloat> %ret
+}
+
define <1 x ptr> @atomic_vec1_ptr(ptr %x) nounwind {
; CHECK3-LABEL: atomic_vec1_ptr:
; CHECK3: ## %bb.0:
@@ -376,6 +438,115 @@ define <4 x i16> @atomic_vec4_i16(ptr %x) nounwind {
ret <4 x i16> %ret
}
+define <4 x half> @atomic_vec4_half(ptr %x) nounwind {
+; CHECK3-LABEL: atomic_vec4_half:
+; CHECK3: ## %bb.0:
+; CHECK3-NEXT: movq (%rdi), %rax
+; CHECK3-NEXT: movl %eax, %ecx
+; CHECK3-NEXT: shrl $16, %ecx
+; CHECK3-NEXT: pinsrw $0, %ecx, %xmm1
+; CHECK3-NEXT: pinsrw $0, %eax, %xmm0
+; CHECK3-NEXT: movq %rax, %rcx
+; CHECK3-NEXT: shrq $32, %rcx
+; CHECK3-NEXT: pinsrw $0, %ecx, %xmm2
+; CHECK3-NEXT: shrq $48, %rax
+; CHECK3-NEXT: pinsrw $0, %eax, %xmm3
+; CHECK3-NEXT: punpcklwd {{.*#+}} xmm2 = xmm2[0],xmm3[0],xmm2[1],xmm3[1],xmm2[2],xmm3[2],xmm2[3],xmm3[3]
+; CHECK3-NEXT: punpcklwd {{.*#+}} xmm0 = xmm0[0],xmm1[0],xmm0[1],xmm1[1],xmm0[2],xmm1[2],xmm0[3],xmm1[3]
+; CHECK3-NEXT: punpckldq {{.*#+}} xmm0 = xmm0[0],xmm2[0],xmm0[1],xmm2[1]
+; CHECK3-NEXT: retq
+;
+; CHECK0-LABEL: atomic_vec4_half:
+; CHECK0: ## %bb.0:
+; CHECK0-NEXT: movq (%rdi), %rax
+; CHECK0-NEXT: movl %eax, %ecx
+; CHECK0-NEXT: shrl $16, %ecx
+; CHECK0-NEXT: movw %cx, %dx
+; CHECK0-NEXT: ## implicit-def: $ecx
+; CHECK0-NEXT: movw %dx, %cx
+; CHECK0-NEXT: ## implicit-def: $xmm2
+; CHECK0-NEXT: pinsrw $0, %ecx, %xmm2
+; CHECK0-NEXT: movw %ax, %dx
+; CHECK0-NEXT: ## implicit-def: $ecx
+; CHECK0-NEXT: movw %dx, %cx
+; CHECK0-NEXT: ## implicit-def: $xmm0
+; CHECK0-NEXT: pinsrw $0, %ecx, %xmm0
+; CHECK0-NEXT: movq %rax, %rcx
+; CHECK0-NEXT: shrq $32, %rcx
+; CHECK0-NEXT: movw %cx, %dx
+; CHECK0-NEXT: ## implicit-def: $ecx
+; CHECK0-NEXT: movw %dx, %cx
+; CHECK0-NEXT: ## implicit-def: $xmm1
+; CHECK0-NEXT: pinsrw $0, %ecx, %xmm1
+; CHECK0-NEXT: shrq $48, %rax
+; CHECK0-NEXT: movw %ax, %cx
+; CHECK0-NEXT: ## implicit-def: $eax
+; CHECK0-NEXT: movw %cx, %ax
+; CHECK0-NEXT: ## implicit-def: $xmm3
+; CHECK0-NEXT: pinsrw $0, %eax, %xmm3
+; CHECK0-NEXT: punpcklwd {{.*#+}} xmm1 = xmm1[0],xmm3[0],xmm1[1],xmm3[1],xmm1[2],xmm3[2],xmm1[3],xmm3[3]
+; CHECK0-NEXT: punpcklwd {{.*#+}} xmm0 = xmm0[0],xmm2[0],xmm0[1],xmm2[1],xmm0[2],xmm2[2],xmm0[3],xmm2[3]
+; CHECK0-NEXT: unpcklps {{.*#+}} xmm0 = xmm0[0],xmm1[0],xmm0[1],xmm1[1]
+; CHECK0-NEXT: retq
+ %ret = load atomic <4 x half>, ptr %x acquire, align 8
+ ret <4 x half> %ret
+}
+
+define <4 x bfloat> @atomic_vec4_bfloat(ptr %x) nounwind {
+; CHECK3-LABEL: atomic_vec4_bfloat:
+; CHECK3: ## %bb.0:
+; CHECK3-NEXT: movq (%rdi), %rax
+; CHECK3-NEXT: movq %rax, %rcx
+; CHECK3-NEXT: movq %rax, %rdx
+; CHECK3-NEXT: pinsrw $0, %eax, %xmm0
+; CHECK3-NEXT: ## kill: def $eax killed $eax killed $rax
+; CHECK3-NEXT: shrl $16, %eax
+; CHECK3-NEXT: shrq $32, %rcx
+; CHECK3-NEXT: shrq $48, %rdx
+; CHECK3-NEXT: pinsrw $0, %edx, %xmm1
+; CHECK3-NEXT: pinsrw $0, %ecx, %xmm2
+; CHECK3-NEXT: punpcklwd {{.*#+}} xmm2 = xmm2[0],xmm1[0],xmm2[1],xmm1[1],xmm2[2],xmm1[2],xmm2[3],xmm1[3]
+; CHECK3-NEXT: pinsrw $0, %eax, %xmm1
+; CHECK3-NEXT: punpcklwd {{.*#+}} xmm0 = xmm0[0],xmm1[0],xmm0[1],xmm1[1],xmm0[2],xmm1[2],xmm0[3],xmm1[3]
+; CHECK3-NEXT: punpckldq {{.*#+}} xmm0 = xmm0[0],xmm2[0],xmm0[1],xmm2[1]
+; CHECK3-NEXT: retq
+;
+; CHECK0-LABEL: atomic_vec4_bfloat:
+; CHECK0: ## %bb.0:
+; CHECK0-NEXT: movq (%rdi), %rax
+; CHECK0-NEXT: movl %eax, %ecx
+; CHECK0-NEXT: shrl $16, %ecx
+; CHECK0-NEXT: ## kill: def $cx killed $cx killed $ecx
+; CHECK0-NEXT: movw %ax, %dx
+; CHECK0-NEXT: movq %rax, %rsi
+; CHECK0-NEXT: shrq $32, %rsi
+; CHECK0-NEXT: ## kill: def $si killed $si killed $rsi
+; CHECK0-NEXT: shrq $48, %rax
+; CHECK0-NEXT: movw %ax, %di
+; CHECK0-NEXT: ## implicit-def: $eax
+; CHECK0-NEXT: movw %di, %ax
+; CHECK0-NEXT: ## implicit-def: $xmm0
+; CHECK0-NEXT: pinsrw $0, %eax, %xmm0
+; CHECK0-NEXT: ## implicit-def: $eax
+; CHECK0-NEXT: movw %si, %ax
+; CHECK0-NEXT: ## implicit-def: $xmm1
+; CHECK0-NEXT: pinsrw $0, %eax, %xmm1
+; CHECK0-NEXT: punpcklwd {{.*#+}} xmm1 = xmm1[0],xmm0[0],xmm1[1],xmm0[1],xmm1[2],xmm0[2],xmm1[3],xmm0[3]
+; CHECK0-NEXT: ## implicit-def: $eax
+; CHECK0-NEXT: movw %dx, %ax
+; CHECK0-NEXT: ## implicit-def: $xmm0
+; CHECK0-NEXT: pinsrw $0, %eax, %xmm0
+; CHECK0-NEXT: ## implicit-def: $eax
+; CHECK0-NEXT: movw %cx, %ax
+; CHECK0-NEXT: ## implicit-def: $xmm2
+; CHECK0-NEXT: pinsrw $0, %eax, %xmm2
+; CHECK0-NEXT: punpcklwd {{.*#+}} xmm0 = xmm0[0],xmm2[0],xmm0[1],xmm2[1],xmm0[2],xmm2[2],xmm0[3],xmm2[3]
+; CHECK0-NEXT: unpcklps {{.*#+}} xmm0 = xmm0[0],xmm1[0],xmm0[1],xmm1[1]
+; CHECK0-NEXT: retq
+ %ret = load atomic <4 x bfloat>, ptr %x acquire, align 8
+ ret <4 x bfloat> %ret
+}
+
define <4 x float> @atomic_vec4_float_align(ptr %x) nounwind {
; CHECK-LABEL: atomic_vec4_float_align:
; CHECK: ## %bb.0:
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