[AMDGPU][MC] Enable lds_direct operand for v_readfirstlane_b32, v_readlane_b32 and v_writelane_b32

See bug 40662: https://bugs.llvm.org/show_bug.cgi?id=40662

Reviewers: artem.tamazov, arsenm, rampitec

Differential Revision: https://reviews.llvm.org/D58713

llvm-svn: 355312

11 files changed, 169 insertions, 69 deletions

diff --git a/llvm/lib/Target/AMDGPU/AsmParser/AMDGPUAsmParser.cpp b/llvm/lib/Target/AMDGPU/AsmParser/AMDGPUAsmParser.cpp
index 0dff52668c6..74f34297697 100644
--- a/llvm/lib/Target/AMDGPU/AsmParser/AMDGPUAsmParser.cpp
+++ b/llvm/lib/Target/AMDGPU/AsmParser/AMDGPUAsmParser.cpp
@@ -415,6 +415,11 @@ public:
     return isSSrcF16();
   }
 
+  bool isSSrcOrLdsB32() const {
+    return isRegOrInlineNoMods(AMDGPU::SRegOrLds_32RegClassID, MVT::i32) ||
+           isLiteralImm(MVT::i32) || isExpr();
+  }
+
   bool isVCSrcB32() const {
     return isRegOrInlineNoMods(AMDGPU::VS_32RegClassID, MVT::i32);
   }
@@ -2477,6 +2482,73 @@ bool AMDGPUAsmParser::validateMIMGD16(const MCInst &Inst) {
   return true;
 }
 
+static bool IsRevOpcode(const unsigned Opcode)
+{
+  switch (Opcode) {
+  case AMDGPU::V_SUBREV_F32_e32:
+  case AMDGPU::V_SUBREV_F32_e64:
+  case AMDGPU::V_SUBREV_F32_e32_si:
+  case AMDGPU::V_SUBREV_F32_e32_vi:
+  case AMDGPU::V_SUBREV_F32_e64_si:
+  case AMDGPU::V_SUBREV_F32_e64_vi:
+  case AMDGPU::V_SUBREV_I32_e32:
+  case AMDGPU::V_SUBREV_I32_e64:
+  case AMDGPU::V_SUBREV_I32_e32_si:
+  case AMDGPU::V_SUBREV_I32_e64_si:
+  case AMDGPU::V_SUBBREV_U32_e32:
+  case AMDGPU::V_SUBBREV_U32_e64:
+  case AMDGPU::V_SUBBREV_U32_e32_si:
+  case AMDGPU::V_SUBBREV_U32_e32_vi:
+  case AMDGPU::V_SUBBREV_U32_e64_si:
+  case AMDGPU::V_SUBBREV_U32_e64_vi:
+  case AMDGPU::V_SUBREV_U32_e32:
+  case AMDGPU::V_SUBREV_U32_e64:
+  case AMDGPU::V_SUBREV_U32_e32_gfx9:
+  case AMDGPU::V_SUBREV_U32_e32_vi:
+  case AMDGPU::V_SUBREV_U32_e64_gfx9:
+  case AMDGPU::V_SUBREV_U32_e64_vi:
+  case AMDGPU::V_SUBREV_F16_e32:
+  case AMDGPU::V_SUBREV_F16_e64:
+  case AMDGPU::V_SUBREV_F16_e32_vi:
+  case AMDGPU::V_SUBREV_F16_e64_vi:
+  case AMDGPU::V_SUBREV_U16_e32:
+  case AMDGPU::V_SUBREV_U16_e64:
+  case AMDGPU::V_SUBREV_U16_e32_vi:
+  case AMDGPU::V_SUBREV_U16_e64_vi:
+  case AMDGPU::V_SUBREV_CO_U32_e32_gfx9:
+  case AMDGPU::V_SUBREV_CO_U32_e64_gfx9:
+  case AMDGPU::V_SUBBREV_CO_U32_e32_gfx9:
+  case AMDGPU::V_SUBBREV_CO_U32_e64_gfx9:
+  case AMDGPU::V_LSHLREV_B32_e32_si:
+  case AMDGPU::V_LSHLREV_B32_e64_si:
+  case AMDGPU::V_LSHLREV_B16_e32_vi:
+  case AMDGPU::V_LSHLREV_B16_e64_vi:
+  case AMDGPU::V_LSHLREV_B32_e32_vi:
+  case AMDGPU::V_LSHLREV_B32_e64_vi:
+  case AMDGPU::V_LSHLREV_B64_vi:
+  case AMDGPU::V_LSHRREV_B32_e32_si:
+  case AMDGPU::V_LSHRREV_B32_e64_si:
+  case AMDGPU::V_LSHRREV_B16_e32_vi:
+  case AMDGPU::V_LSHRREV_B16_e64_vi:
+  case AMDGPU::V_LSHRREV_B32_e32_vi:
+  case AMDGPU::V_LSHRREV_B32_e64_vi:
+  case AMDGPU::V_LSHRREV_B64_vi:
+  case AMDGPU::V_ASHRREV_I32_e64_si:
+  case AMDGPU::V_ASHRREV_I32_e32_si:
+  case AMDGPU::V_ASHRREV_I16_e32_vi:
+  case AMDGPU::V_ASHRREV_I16_e64_vi:
+  case AMDGPU::V_ASHRREV_I32_e32_vi:
+  case AMDGPU::V_ASHRREV_I32_e64_vi:
+  case AMDGPU::V_ASHRREV_I64_vi:
+  case AMDGPU::V_PK_LSHLREV_B16_vi:
+  case AMDGPU::V_PK_LSHRREV_B16_vi:
+  case AMDGPU::V_PK_ASHRREV_I16_vi:
+    return true;
+  default:
+    return false;
+  }
+}
+
 bool AMDGPUAsmParser::validateLdsDirect(const MCInst &Inst) {
 
   using namespace SIInstrFlags;
@@ -2511,50 +2583,7 @@ bool AMDGPUAsmParser::validateLdsDirect(const MCInst &Inst) {
     return true;
 
   // lds_direct is specified as src0. Check additional limitations.
-
-  // FIXME: This is a workaround for bug 37943
-  // which allows 64-bit VOP3 opcodes use 32-bit operands.
-  if (AMDGPU::getRegOperandSize(getMRI(), Desc, Src0Idx) != 4)
-    return false;
-
-  // Documentation does not disable lds_direct for SDWA, but SP3 assembler does.
-  // FIXME: This inconsistence needs to be investigated further.
-  if (Desc.TSFlags & SIInstrFlags::SDWA)
-    return false;
-
-  // The following opcodes do not accept lds_direct which is explicitly stated
-  // in AMD documentation. However SP3 disables lds_direct for most other 'rev'
-  // opcodes as well (e.g. for v_subrev_u32 but not for v_subrev_f32).
-  // FIXME: This inconsistence needs to be investigated further.
-  switch (Opcode) {
-  case AMDGPU::V_LSHLREV_B32_e32_si:
-  case AMDGPU::V_LSHLREV_B32_e64_si:
-  case AMDGPU::V_LSHLREV_B16_e32_vi:
-  case AMDGPU::V_LSHLREV_B16_e64_vi:
-  case AMDGPU::V_LSHLREV_B32_e32_vi:
-  case AMDGPU::V_LSHLREV_B32_e64_vi:
-  case AMDGPU::V_LSHLREV_B64_vi:
-  case AMDGPU::V_LSHRREV_B32_e32_si:
-  case AMDGPU::V_LSHRREV_B32_e64_si:
-  case AMDGPU::V_LSHRREV_B16_e32_vi:
-  case AMDGPU::V_LSHRREV_B16_e64_vi:
-  case AMDGPU::V_LSHRREV_B32_e32_vi:
-  case AMDGPU::V_LSHRREV_B32_e64_vi:
-  case AMDGPU::V_LSHRREV_B64_vi:
-  case AMDGPU::V_ASHRREV_I32_e64_si:
-  case AMDGPU::V_ASHRREV_I32_e32_si:
-  case AMDGPU::V_ASHRREV_I16_e32_vi:
-  case AMDGPU::V_ASHRREV_I16_e64_vi:
-  case AMDGPU::V_ASHRREV_I32_e32_vi:
-  case AMDGPU::V_ASHRREV_I32_e64_vi:
-  case AMDGPU::V_ASHRREV_I64_vi:
-  case AMDGPU::V_PK_LSHLREV_B16_vi:
-  case AMDGPU::V_PK_LSHRREV_B16_vi:
-  case AMDGPU::V_PK_ASHRREV_I16_vi:
-    return false;
-  default:
-    return true;
-  }
+  return (Desc.TSFlags & SIInstrFlags::SDWA) == 0 && !IsRevOpcode(Opcode);
 }
 
 bool AMDGPUAsmParser::validateSOPLiteral(const MCInst &Inst) const {
diff --git a/llvm/lib/Target/AMDGPU/Disassembler/AMDGPUDisassembler.cpp b/llvm/lib/Target/AMDGPU/Disassembler/AMDGPUDisassembler.cpp
index 9ae1bcd44ec..0acd30f5408 100644
--- a/llvm/lib/Target/AMDGPU/Disassembler/AMDGPUDisassembler.cpp
+++ b/llvm/lib/Target/AMDGPU/Disassembler/AMDGPUDisassembler.cpp
@@ -97,6 +97,7 @@ static DecodeStatus StaticDecoderName(MCInst &Inst, \
 DECODE_OPERAND(Decode##RegClass##RegisterClass, decodeOperand_##RegClass)
 
 DECODE_OPERAND_REG(VGPR_32)
+DECODE_OPERAND_REG(VRegOrLds_32)
 DECODE_OPERAND_REG(VS_32)
 DECODE_OPERAND_REG(VS_64)
 DECODE_OPERAND_REG(VS_128)
@@ -108,6 +109,7 @@ DECODE_OPERAND_REG(VReg_128)
 DECODE_OPERAND_REG(SReg_32)
 DECODE_OPERAND_REG(SReg_32_XM0_XEXEC)
 DECODE_OPERAND_REG(SReg_32_XEXEC_HI)
+DECODE_OPERAND_REG(SRegOrLds_32)
 DECODE_OPERAND_REG(SReg_64)
 DECODE_OPERAND_REG(SReg_64_XEXEC)
 DECODE_OPERAND_REG(SReg_128)
@@ -469,6 +471,10 @@ MCOperand AMDGPUDisassembler::decodeOperand_VGPR_32(unsigned Val) const {
   return createRegOperand(AMDGPU::VGPR_32RegClassID, Val);
 }
 
+MCOperand AMDGPUDisassembler::decodeOperand_VRegOrLds_32(unsigned Val) const {
+  return decodeSrcOp(OPW32, Val);
+}
+
 MCOperand AMDGPUDisassembler::decodeOperand_VReg_64(unsigned Val) const {
   return createRegOperand(AMDGPU::VReg_64RegClassID, Val);
 }
@@ -500,6 +506,13 @@ MCOperand AMDGPUDisassembler::decodeOperand_SReg_32_XEXEC_HI(
   return decodeOperand_SReg_32(Val);
 }
 
+MCOperand AMDGPUDisassembler::decodeOperand_SRegOrLds_32(unsigned Val) const {
+  // table-gen generated disassembler doesn't care about operand types
+  // leaving only registry class so SSrc_32 operand turns into SReg_32
+  // and therefore we accept immediates and literals here as well
+  return decodeSrcOp(OPW32, Val);
+}
+
 MCOperand AMDGPUDisassembler::decodeOperand_SReg_64(unsigned Val) const {
   return decodeSrcOp(OPW64, Val);
 }
diff --git a/llvm/lib/Target/AMDGPU/Disassembler/AMDGPUDisassembler.h b/llvm/lib/Target/AMDGPU/Disassembler/AMDGPUDisassembler.h
index 4e1c75ff57b..9d7fedb97c2 100644
--- a/llvm/lib/Target/AMDGPU/Disassembler/AMDGPUDisassembler.h
+++ b/llvm/lib/Target/AMDGPU/Disassembler/AMDGPUDisassembler.h
@@ -71,6 +71,8 @@ public:
   DecodeStatus convertMIMGInst(MCInst &MI) const;
 
   MCOperand decodeOperand_VGPR_32(unsigned Val) const;
+  MCOperand decodeOperand_VRegOrLds_32(unsigned Val) const;
+
   MCOperand decodeOperand_VS_32(unsigned Val) const;
   MCOperand decodeOperand_VS_64(unsigned Val) const;
   MCOperand decodeOperand_VS_128(unsigned Val) const;
@@ -84,6 +86,7 @@ public:
   MCOperand decodeOperand_SReg_32(unsigned Val) const;
   MCOperand decodeOperand_SReg_32_XM0_XEXEC(unsigned Val) const;
   MCOperand decodeOperand_SReg_32_XEXEC_HI(unsigned Val) const;
+  MCOperand decodeOperand_SRegOrLds_32(unsigned Val) const;
   MCOperand decodeOperand_SReg_64(unsigned Val) const;
   MCOperand decodeOperand_SReg_64_XEXEC(unsigned Val) const;
   MCOperand decodeOperand_SReg_128(unsigned Val) const;
diff --git a/llvm/lib/Target/AMDGPU/SIRegisterInfo.td b/llvm/lib/Target/AMDGPU/SIRegisterInfo.td
index 84751d1cbfe..5f04a8c816c 100644
--- a/llvm/lib/Target/AMDGPU/SIRegisterInfo.td
+++ b/llvm/lib/Target/AMDGPU/SIRegisterInfo.td
@@ -442,6 +442,11 @@ def SReg_32 : RegisterClass<"AMDGPU", [i32, f32, i16, f16, v2i16, v2f16], 32,
   let AllocationPriority = 7;
 }
 
+def SRegOrLds_32 : RegisterClass<"AMDGPU", [i32, f32, i16, f16, v2i16, v2f16], 32,
+  (add SReg_32_XM0, M0_CLASS, EXEC_LO, EXEC_HI, SReg_32_XEXEC_HI, LDS_DIRECT_CLASS)> {
+  let isAllocatable = 0;
+}
+
 def SGPR_64 : RegisterClass<"AMDGPU", [v2i32, i64, v2f32, f64, v4i16, v4f16], 32, (add SGPR_64Regs)> {
   let CopyCost = 1;
   let AllocationPriority = 8;
@@ -511,6 +516,11 @@ def SReg_512 : RegisterClass<"AMDGPU", [v16i32, v16f32], 32,
   let AllocationPriority = 12;
 }
 
+def VRegOrLds_32 : RegisterClass<"AMDGPU", [i32, f32, i16, f16, v2i16, v2f16], 32,
+                                 (add VGPR_32, LDS_DIRECT_CLASS)> {
+  let isAllocatable = 0;
+}
+
 // Register class for all vector registers (VGPRs + Interploation Registers)
 def VReg_64 : RegisterClass<"AMDGPU", [i64, f64, v2i32, v2f32, v4f16, v4i16], 32, (add VGPR_64)> {
   let Size = 64;
@@ -631,6 +641,12 @@ multiclass RegInlineOperand <string rc, string MatchName>
 
 defm SSrc : RegImmOperand<"SReg", "SSrc">;
 
+def SSrcOrLds_b32 : RegisterOperand<SRegOrLds_32> {
+  let OperandNamespace = "AMDGPU";
+  let OperandType = "OPERAND_REG_IMM_INT32";
+  let ParserMatchClass = RegImmMatcher<"SSrcOrLdsB32">;
+}
+
 //===----------------------------------------------------------------------===//
 //  SCSrc_* Operands with an SGPR or a inline constant
 //===----------------------------------------------------------------------===//
diff --git a/llvm/lib/Target/AMDGPU/Utils/AMDGPUBaseInfo.cpp b/llvm/lib/Target/AMDGPU/Utils/AMDGPUBaseInfo.cpp
index e1727338599..96128749081 100644
--- a/llvm/lib/Target/AMDGPU/Utils/AMDGPUBaseInfo.cpp
+++ b/llvm/lib/Target/AMDGPU/Utils/AMDGPUBaseInfo.cpp
@@ -802,9 +802,11 @@ unsigned getRegBitWidth(unsigned RCID) {
   switch (RCID) {
   case AMDGPU::SGPR_32RegClassID:
   case AMDGPU::VGPR_32RegClassID:
+  case AMDGPU::VRegOrLds_32RegClassID:
   case AMDGPU::VS_32RegClassID:
   case AMDGPU::SReg_32RegClassID:
   case AMDGPU::SReg_32_XM0RegClassID:
+  case AMDGPU::SRegOrLds_32RegClassID:
     return 32;
   case AMDGPU::SGPR_64RegClassID:
   case AMDGPU::VS_64RegClassID:
diff --git a/llvm/lib/Target/AMDGPU/VOP1Instructions.td b/llvm/lib/Target/AMDGPU/VOP1Instructions.td
index 15006155d9b..aafe0339acf 100644
--- a/llvm/lib/Target/AMDGPU/VOP1Instructions.td
+++ b/llvm/lib/Target/AMDGPU/VOP1Instructions.td
@@ -142,7 +142,7 @@ defm V_MOV_B32 : VOP1Inst <"v_mov_b32", VOP_I32_I32>;
 // TODO: Make profile for this, there is VOP3 encoding also
 def V_READFIRSTLANE_B32 :
   InstSI <(outs SReg_32:$vdst),
-    (ins VGPR_32:$src0),
+    (ins VRegOrLds_32:$src0),
     "v_readfirstlane_b32 $vdst, $src0",
     [(set i32:$vdst, (int_amdgcn_readfirstlane i32:$src0))]>,
   Enc32 {
diff --git a/llvm/lib/Target/AMDGPU/VOP2Instructions.td b/llvm/lib/Target/AMDGPU/VOP2Instructions.td
index ee165515ce7..9a0a81c97ef 100644
--- a/llvm/lib/Target/AMDGPU/VOP2Instructions.td
+++ b/llvm/lib/Target/AMDGPU/VOP2Instructions.td
@@ -360,7 +360,7 @@ def VOP2e_I32_I32_I32_I1 : VOPProfile<[i32, i32, i32, i1]> {
 def VOP_READLANE : VOPProfile<[i32, i32, i32]> {
   let Outs32 = (outs SReg_32:$vdst);
   let Outs64 = Outs32;
-  let Ins32 = (ins VGPR_32:$src0, SCSrc_b32:$src1);
+  let Ins32 = (ins VRegOrLds_32:$src0, SCSrc_b32:$src1);
   let Ins64 = Ins32;
   let Asm32 = " $vdst, $src0, $src1";
   let Asm64 = Asm32;
@@ -765,7 +765,7 @@ defm V_SUBBREV_U32        : VOP2be_Real_e32e64_si <0x2a>;
 
 defm V_READLANE_B32       : VOP2_Real_si <0x01>;
 
-let InOperandList = (ins SSrc_b32:$src0, SCSrc_b32:$src1, VSrc_b32:$vdst_in) in {
+let InOperandList = (ins SSrcOrLds_b32:$src0, SCSrc_b32:$src1, VSrc_b32:$vdst_in) in {
 defm V_WRITELANE_B32      : VOP2_Real_si <0x02>;
 }
 
diff --git a/llvm/test/MC/AMDGPU/lds_direct-ci.s b/llvm/test/MC/AMDGPU/lds_direct-ci.s
new file mode 100644
index 00000000000..c8d3955042b
--- /dev/null
+++ b/llvm/test/MC/AMDGPU/lds_direct-ci.s
@@ -0,0 +1,10 @@
+// RUN: llvm-mc -arch=amdgcn -mcpu=bonaire -show-encoding %s | FileCheck %s --check-prefix=CI
+
+v_readfirstlane_b32 s0, lds_direct
+// CI: v_readfirstlane_b32 s0, src_lds_direct ; encoding: [0xfe,0x04,0x00,0x7e]
+
+v_readlane_b32 s0, lds_direct, s0
+// CI: v_readlane_b32 s0, src_lds_direct, s0 ; encoding: [0xfe,0x00,0x00,0x02]
+
+v_writelane_b32 v0, lds_direct, s0
+// CI: v_writelane_b32 v0, src_lds_direct, s0 ; encoding: [0xfe,0x00,0x00,0x04]
diff --git a/llvm/test/MC/AMDGPU/lds_direct-err.s b/llvm/test/MC/AMDGPU/lds_direct-err.s
index 25a5cda6a54..578461bc35a 100644
--- a/llvm/test/MC/AMDGPU/lds_direct-err.s
+++ b/llvm/test/MC/AMDGPU/lds_direct-err.s
@@ -5,55 +5,77 @@
 //---------------------------------------------------------------------------//
 
 s_and_b32 s2, lds_direct, s1
-// NOGFX9: error
+// NOGFX9: error: invalid operand for instruction
 
 //---------------------------------------------------------------------------//
-// lds_direct may not be used with V_{LSHL,LSHR,ASHL}REV opcodes
+// lds_direct may not be used with "REV" opcodes
 //---------------------------------------------------------------------------//
 
 v_ashrrev_i16 v0, lds_direct, v0
-// NOGFX9: error
+// NOGFX9: error: invalid use of lds_direct
 
 v_ashrrev_i32 v0, lds_direct, v0
-// NOGFX9: error
+// NOGFX9: error: invalid use of lds_direct
 
 v_lshlrev_b16 v0, lds_direct, v0
-// NOGFX9: error
+// NOGFX9: error: invalid use of lds_direct
 
 v_lshlrev_b32 v0, lds_direct, v0
-// NOGFX9: error
+// NOGFX9: error: invalid use of lds_direct
 
 v_lshrrev_b16 v0, lds_direct, v0
-// NOGFX9: error
+// NOGFX9: error: invalid use of lds_direct
 
 v_lshrrev_b32 v0, lds_direct, v0
-// NOGFX9: error
+// NOGFX9: error: invalid use of lds_direct
 
 v_pk_ashrrev_i16 v0, lds_direct, v0
-// NOGFX9: error
+// NOGFX9: error: invalid use of lds_direct
 
 v_pk_lshlrev_b16 v0, lds_direct, v0
-// NOGFX9: error
+// NOGFX9: error: invalid use of lds_direct
 
 v_pk_lshrrev_b16 v0, lds_direct, v0
-// NOGFX9: error
+// NOGFX9: error: invalid use of lds_direct
+
+v_subbrev_co_u32 v0, vcc, src_lds_direct, v0, vcc
+// NOGFX9: error: invalid use of lds_direct
+
+v_subrev_co_u32 v0, vcc, src_lds_direct, v0
+// NOGFX9: error: invalid use of lds_direct
+
+v_subrev_f16 v0, src_lds_direct, v0
+// NOGFX9: error: invalid use of lds_direct
+
+v_subrev_u16 v0, src_lds_direct, v0
+// NOGFX9: error: invalid use of lds_direct
+
+v_subrev_u32 v0, src_lds_direct, v0
+// NOGFX9: error: invalid use of lds_direct
+
+//---------------------------------------------------------------------------//
+// lds_direct may not be used with v_writelane_b32 for VI/GFX9
+//---------------------------------------------------------------------------//
+
+v_writelane_b32 v0, lds_direct, s0
+// NOGFX9: error: instruction not supported on this GPU
 
 //---------------------------------------------------------------------------//
 // lds_direct cannot be used with 64-bit and larger operands
 //---------------------------------------------------------------------------//
 
 v_add_f64 v[0:1], lds_direct, v[0:1]
-// NOGFX9: error
+// NOGFX9: error: invalid operand for instruction
 
 //---------------------------------------------------------------------------//
 // Only SRC0 may specify lds_direct
 //---------------------------------------------------------------------------//
 
 v_add_i32 v0, v0, lds_direct
-// NOGFX9: error
+// NOGFX9: error: invalid use of lds_direct
 
 v_add_i32 lds_direct, v0, v0
-// NOGFX9: error
+// NOGFX9: error: invalid operand for instruction
 
 v_fma_f32 v0, v0, v0, lds_direct
-// NOGFX9: error
+// NOGFX9: error: invalid use of lds_direct
diff --git a/llvm/test/MC/AMDGPU/lds_direct.s b/llvm/test/MC/AMDGPU/lds_direct.s
index 33f631e79b0..6a879ee03d1 100644
--- a/llvm/test/MC/AMDGPU/lds_direct.s
+++ b/llvm/test/MC/AMDGPU/lds_direct.s
@@ -31,6 +31,9 @@ v_fract_f32_e64 v0, src_lds_direct
 v_cvt_f16_u16 v0, src_lds_direct
 // GFX9: v_cvt_f16_u16_e32 v0, src_lds_direct ; encoding: [0xfe,0x72,0x00,0x7e]
 
+v_readfirstlane_b32 s0, src_lds_direct
+// GFX9: v_readfirstlane_b32 s0, src_lds_direct ; encoding: [0xfe,0x04,0x00,0x7e]
+
 //---------------------------------------------------------------------------//
 // VOP2/3
 //---------------------------------------------------------------------------//
@@ -78,6 +81,9 @@ v_min3_i16 v0, src_lds_direct, v0, v0
 v_max3_f16 v0, src_lds_direct, v0, v0
 // GFX9: v_max3_f16 v0, src_lds_direct, v0, v0 ; encoding: [0x00,0x00,0xf7,0xd1,0xfe,0x00,0x02,0x04]
 
+v_readlane_b32 s0, src_lds_direct, s0
+// GFX9: v_readlane_b32 s0, src_lds_direct, s0 ; encoding: [0x00,0x00,0x89,0xd2,0xfe,0x00,0x00,0x00]
+
 //---------------------------------------------------------------------------//
 // VOP3P
 //---------------------------------------------------------------------------//
@@ -107,10 +113,3 @@ v_cmpx_neq_f32 vcc, src_lds_direct, v0
 
 v_cmp_lt_f16 vcc, lds_direct, v0
 // GFX9: v_cmp_lt_f16_e32 vcc, src_lds_direct, v0 ; encoding: [0xfe,0x00,0x42,0x7c]
-
-//---------------------------------------------------------------------------//
-// FIXME: enable lds_direct for the following opcodes and add tests
-//---------------------------------------------------------------------------//
-
-//v_readfirstlane_b32 s0, src_lds_direct
-//v_readlane_b32 s0, src_lds_direct, s0
diff --git a/llvm/test/MC/Disassembler/AMDGPU/lds_direct_gfx9.txt b/llvm/test/MC/Disassembler/AMDGPU/lds_direct_gfx9.txt
index 3480d6f2a68..e29c4d2f62b 100644
--- a/llvm/test/MC/Disassembler/AMDGPU/lds_direct_gfx9.txt
+++ b/llvm/test/MC/Disassembler/AMDGPU/lds_direct_gfx9.txt
@@ -17,3 +17,9 @@
 
 # GFX9: v_cmpx_le_i32_e32 vcc, src_lds_direct, v0 ; encoding: [0xfe,0x00,0xa6,0x7d]
 0xfe,0x00,0xa6,0x7d
+
+# GFX9: v_readlane_b32 s0, src_lds_direct, s0 ; encoding: [0x00,0x00,0x89,0xd2,0xfe,0x00,0x00,0x00]
+0x00,0x00,0x89,0xd2,0xfe,0x00,0x00,0x00
+
+# GFX9: v_readfirstlane_b32 s0, src_lds_direct ; encoding: [0xfe,0x04,0x00,0x7e]
+0xfe,0x04,0x00,0x7e