[AMDGPU] In VectorLegalizer::Expand, if UnrollVectorOp returns Load, … (#88475)

…return only Load since other output is chain.

Added testcase that showed mismatched expected arity when Load and chain
were returned as separate items after
003b58f

Author: choikwa

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) {

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 +97,99 @@ 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
+}