[llvm] [AMDGPU] In VectorLegalizer::Expand, if UnrollVectorOp returns Load, … (PR #88475)
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Mon Apr 15 11:17:05 PDT 2024
https://github.com/choikwa updated https://github.com/llvm/llvm-project/pull/88475
>From ade411002ae457cca309fad13d940e8fc2499b95 Mon Sep 17 00:00:00 2001
From: Kevin Choi <kevin.choi at amd.com>
Date: Fri, 12 Apr 2024 00:57:26 -0500
Subject: [PATCH] [AMDGPU] In VectorLegalizer::Expand, if Node has only one
value, return the result of UnrollVectorOp. Otherwise, check that Node and
Unrolled has same number of values and return corresponding values.
Added testcase that showed mismatched expected arity when Load and chain were returned as separate items after 003b58f65bdd5d9c7d0c1b355566c9ef430c0e7d
---
.../SelectionDAG/LegalizeVectorOps.cpp | 10 +-
llvm/test/CodeGen/AMDGPU/build_vector.ll | 98 +++++++++++++++++++
2 files changed, 106 insertions(+), 2 deletions(-)
diff --git a/llvm/lib/CodeGen/SelectionDAG/LegalizeVectorOps.cpp b/llvm/lib/CodeGen/SelectionDAG/LegalizeVectorOps.cpp
index 57a3f6a65e002c..7a9cfdf5c3fda9 100644
--- a/llvm/lib/CodeGen/SelectionDAG/LegalizeVectorOps.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/LegalizeVectorOps.cpp
@@ -1159,8 +1159,14 @@ void VectorLegalizer::Expand(SDNode *Node, SmallVectorImpl<SDValue> &Results) {
}
SDValue Unrolled = DAG.UnrollVectorOp(Node);
- for (unsigned I = 0, E = Unrolled->getNumValues(); I != E; ++I)
- Results.push_back(Unrolled.getValue(I));
+ if (Node->getNumValues() == 1) {
+ Results.push_back(Unrolled);
+ } else {
+ assert(Node->getNumValues() == Unrolled->getNumValues() &&
+ "VectorLegalizer Expand returned wrong number of results!");
+ for (unsigned I = 0, E = Unrolled->getNumValues(); I != E; ++I)
+ Results.push_back(Unrolled.getValue(I));
+ }
}
SDValue VectorLegalizer::ExpandSELECT(SDNode *Node) {
diff --git a/llvm/test/CodeGen/AMDGPU/build_vector.ll b/llvm/test/CodeGen/AMDGPU/build_vector.ll
index 37412ac3aa5418..5b52e3aa70ab60 100644
--- a/llvm/test/CodeGen/AMDGPU/build_vector.ll
+++ b/llvm/test/CodeGen/AMDGPU/build_vector.ll
@@ -3,6 +3,7 @@
; RUN: llc < %s -mtriple=amdgcn -mcpu=tonga -mattr=-flat-for-global -verify-machineinstrs | FileCheck %s --check-prefixes=GFX8,GFX678,ALL
; RUN: llc < %s -mtriple=amdgcn-amd-amdpal -mcpu=gfx1030 -verify-machineinstrs | FileCheck %s --check-prefixes=GFX10,GFX1011,ALL
; RUN: llc < %s -mtriple=amdgcn-amd-amdpal -mcpu=gfx1100 -amdgpu-enable-vopd=0 -verify-machineinstrs | FileCheck %s --check-prefixes=GFX11,GFX1011,ALL
+; RUN: llc < %s -mtriple=amdgcn -mcpu=gfx940 | FileCheck %s --check-prefixes=GFX940,ALL
; ALL-LABEL: {{^}}build_vector2:
; R600: MOV
@@ -96,3 +97,100 @@ define amdgpu_kernel void @build_vector_v2i16_trunc (ptr addrspace(1) %out, i32
store <2 x i16> %ins.1, ptr addrspace(1) %out
ret void
}
+
+; R600-LABEL: build_v2i32_from_v4i16_shuffle:
+; R600: ; %bb.0: ; %entry
+; R600-NEXT: ALU 0, @10, KC0[], KC1[]
+; R600-NEXT: TEX 1 @6
+; R600-NEXT: ALU 4, @11, KC0[CB0:0-32], KC1[]
+; R600-NEXT: MEM_RAT_CACHELESS STORE_RAW T0.XY, T1.X, 1
+; R600-NEXT: CF_END
+; R600-NEXT: PAD
+; R600-NEXT: Fetch clause starting at 6:
+; R600-NEXT: VTX_READ_16 T1.X, T0.X, 48, #3
+; R600-NEXT: VTX_READ_16 T0.X, T0.X, 44, #3
+; R600-NEXT: ALU clause starting at 10:
+; R600-NEXT: MOV * T0.X, 0.0,
+; R600-NEXT: ALU clause starting at 11:
+; R600-NEXT: LSHL * T0.Y, T1.X, literal.x,
+; R600-NEXT: 16(2.242078e-44), 0(0.000000e+00)
+; R600-NEXT: LSHL T0.X, T0.X, literal.x,
+; R600-NEXT: LSHR * T1.X, KC0[2].Y, literal.y,
+; R600-NEXT: 16(2.242078e-44), 2(2.802597e-45)
+;
+; GFX6-LABEL: build_v2i32_from_v4i16_shuffle:
+; GFX6: ; %bb.0: ; %entry
+; GFX6-NEXT: s_load_dwordx4 s[0:3], s[0:1], 0x9
+; GFX6-NEXT: s_mov_b32 s7, 0xf000
+; GFX6-NEXT: s_waitcnt lgkmcnt(0)
+; GFX6-NEXT: s_lshl_b32 s3, s3, 16
+; GFX6-NEXT: s_lshl_b32 s2, s2, 16
+; GFX6-NEXT: s_mov_b32 s6, -1
+; GFX6-NEXT: s_mov_b32 s4, s0
+; GFX6-NEXT: s_mov_b32 s5, s1
+; GFX6-NEXT: v_mov_b32_e32 v0, s2
+; GFX6-NEXT: v_mov_b32_e32 v1, s3
+; GFX6-NEXT: buffer_store_dwordx2 v[0:1], off, s[4:7], 0
+; GFX6-NEXT: s_endpgm
+;
+; GFX8-LABEL: build_v2i32_from_v4i16_shuffle:
+; GFX8: ; %bb.0: ; %entry
+; GFX8-NEXT: s_load_dwordx4 s[0:3], s[0:1], 0x24
+; GFX8-NEXT: s_mov_b32 s7, 0xf000
+; GFX8-NEXT: s_mov_b32 s6, -1
+; GFX8-NEXT: s_waitcnt lgkmcnt(0)
+; GFX8-NEXT: s_mov_b32 s4, s0
+; GFX8-NEXT: s_mov_b32 s5, s1
+; GFX8-NEXT: s_lshl_b32 s0, s3, 16
+; GFX8-NEXT: s_lshl_b32 s1, s2, 16
+; GFX8-NEXT: v_mov_b32_e32 v0, s1
+; GFX8-NEXT: v_mov_b32_e32 v1, s0
+; GFX8-NEXT: buffer_store_dwordx2 v[0:1], off, s[4:7], 0
+; GFX8-NEXT: s_endpgm
+;
+; GFX10-LABEL: build_v2i32_from_v4i16_shuffle:
+; GFX10: ; %bb.0: ; %entry
+; GFX10-NEXT: s_load_dwordx4 s[0:3], s[0:1], 0x0
+; GFX10-NEXT: v_mov_b32_e32 v2, 0
+; GFX10-NEXT: s_waitcnt lgkmcnt(0)
+; GFX10-NEXT: s_lshl_b32 s2, s2, 16
+; GFX10-NEXT: s_lshl_b32 s3, s3, 16
+; GFX10-NEXT: v_mov_b32_e32 v0, s2
+; GFX10-NEXT: v_mov_b32_e32 v1, s3
+; GFX10-NEXT: global_store_dwordx2 v2, v[0:1], s[0:1]
+; GFX10-NEXT: s_endpgm
+;
+; GFX11-LABEL: build_v2i32_from_v4i16_shuffle:
+; GFX11: ; %bb.0: ; %entry
+; GFX11-NEXT: s_load_b128 s[0:3], s[0:1], 0x0
+; GFX11-NEXT: v_mov_b32_e32 v2, 0
+; GFX11-NEXT: s_waitcnt lgkmcnt(0)
+; GFX11-NEXT: s_lshl_b32 s2, s2, 16
+; GFX11-NEXT: s_lshl_b32 s3, s3, 16
+; GFX11-NEXT: v_mov_b32_e32 v0, s2
+; GFX11-NEXT: v_mov_b32_e32 v1, s3
+; GFX11-NEXT: global_store_b64 v2, v[0:1], s[0:1]
+; GFX11-NEXT: s_nop 0
+; GFX11-NEXT: s_sendmsg sendmsg(MSG_DEALLOC_VGPRS)
+; GFX11-NEXT: s_endpgm
+;
+; GFX940-LABEL: build_v2i32_from_v4i16_shuffle:
+; GFX940: ; %bb.0: ; %entry
+; GFX940-NEXT: s_load_dwordx4 s[0:3], s[0:1], 0x24
+; GFX940-NEXT: v_mov_b32_e32 v2, 0
+; GFX940-NEXT: s_waitcnt lgkmcnt(0)
+; GFX940-NEXT: s_lshl_b32 s3, s3, 16
+; GFX940-NEXT: s_lshl_b32 s2, s2, 16
+; GFX940-NEXT: v_mov_b32_e32 v0, s2
+; GFX940-NEXT: v_mov_b32_e32 v1, s3
+; GFX940-NEXT: global_store_dwordx2 v2, v[0:1], s[0:1] sc0 sc1
+; GFX940-NEXT: s_endpgm
+define amdgpu_kernel void @build_v2i32_from_v4i16_shuffle(ptr addrspace(1) %out, <4 x i16> %in) {
+entry:
+ %shuf = shufflevector <4 x i16> %in, <4 x i16> zeroinitializer, <2 x i32> <i32 0, i32 2>
+ %zextended = zext <2 x i16> %shuf to <2 x i32>
+ %shifted = shl <2 x i32> %zextended, <i32 16, i32 16>
+ store <2 x i32> %shifted, ptr addrspace(1) %out
+ ret void
+}
+
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