[llvm] [RISCV][Xqccmp] Correctly Parse/Disassemble pushfp (PR #133188)
Sam Elliott via llvm-commits
llvm-commits at lists.llvm.org
Wed Mar 26 18:57:50 PDT 2025
https://github.com/lenary updated https://github.com/llvm/llvm-project/pull/133188
>From 8ab597e7ff76a13ab9d32a551f5fbc9377ca231e Mon Sep 17 00:00:00 2001
From: Sam Elliott <quic_aelliott at quicinc.com>
Date: Wed, 26 Mar 2025 17:59:49 -0700
Subject: [PATCH 1/4] [RISCV][Xqccmp] Correctly Parse/Disassemble pushfp
In the `qc.cm.pushfp` instruction, it is like `cm.pushfp` except in one
important way - `qc.cm.pushfp {ra}, -N*16` is not a valid encoding,
because this would update `s0`/`fp`/`x8` without saving it.
This change now correctly rejects this variant of the instruction, both
during parsing and during disassembly. I also implemented validation for
immediates that represent register lists (both kinds), which may help to
catch bugs in the future.
---
.../Target/RISCV/AsmParser/RISCVAsmParser.cpp | 27 ++++++++++++-
.../RISCV/Disassembler/RISCVDisassembler.cpp | 11 +++++
.../Target/RISCV/MCTargetDesc/RISCVBaseInfo.h | 2 +
.../RISCV/MCTargetDesc/RISCVMCCodeEmitter.cpp | 15 +++++++
llvm/lib/Target/RISCV/RISCVInstrInfo.cpp | 6 +++
llvm/lib/Target/RISCV/RISCVInstrInfoXqccmp.td | 40 ++++++++++++++++++-
llvm/lib/Target/RISCV/RISCVInstrInfoZc.td | 4 +-
.../RISCV/xqccmp-invalid-rlist.txt | 11 +++++
llvm/test/MC/RISCV/rv32xqccmp-invalid.s | 4 ++
llvm/test/MC/RISCV/rv32xqccmp-valid.s | 8 ----
llvm/test/MC/RISCV/rv64e-xqccmp-valid.s | 4 --
llvm/test/MC/RISCV/rv64xqccmp-valid.s | 4 --
12 files changed, 116 insertions(+), 20 deletions(-)
create mode 100644 llvm/test/MC/Disassembler/RISCV/xqccmp-invalid-rlist.txt
diff --git a/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp b/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp
index 0d40fb5614009..19f28a6287060 100644
--- a/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp
+++ b/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp
@@ -215,7 +215,10 @@ class RISCVAsmParser : public MCTargetAsmParser {
ParseStatus parseGPRPair(OperandVector &Operands, bool IsRV64Inst);
ParseStatus parseFRMArg(OperandVector &Operands);
ParseStatus parseFenceArg(OperandVector &Operands);
+
+ template <bool MustIncludeS0 = false>
ParseStatus parseReglist(OperandVector &Operands);
+
ParseStatus parseRegReg(OperandVector &Operands);
ParseStatus parseRetval(OperandVector &Operands);
ParseStatus parseZcmpStackAdj(OperandVector &Operands,
@@ -474,6 +477,7 @@ struct RISCVOperand final : public MCParsedAsmOperand {
bool isSystemRegister() const { return Kind == KindTy::SystemRegister; }
bool isRegReg() const { return Kind == KindTy::RegReg; }
bool isRlist() const { return Kind == KindTy::Rlist; }
+ bool isRlistS0() const { return Kind == KindTy::Rlist && Rlist.Val != 4; }
bool isSpimm() const { return Kind == KindTy::Spimm; }
bool isGPR() const {
@@ -2794,9 +2798,15 @@ ParseStatus RISCVAsmParser::parseRegReg(OperandVector &Operands) {
return ParseStatus::Success;
}
+template <bool MustIncludeS0>
ParseStatus RISCVAsmParser::parseReglist(OperandVector &Operands) {
// Rlist: {ra [, s0[-sN]]}
// XRlist: {x1 [, x8[-x9][, x18[-xN]]]}
+
+ // When MustIncludeS0 = true (not the default) (used for `qc.cm.pushfp`) which
+ // must include `fp`/`s0` in the list:
+ // Rlist: {ra, s0[-sN]}
+ // XRlist: {x1, x8[-x9][, x18[-xN]]}
SMLoc S = getLoc();
if (parseToken(AsmToken::LCurly, "register list must start with '{'"))
@@ -2814,8 +2824,19 @@ ParseStatus RISCVAsmParser::parseReglist(OperandVector &Operands) {
return Error(getLoc(), "register list must start from 'ra' or 'x1'");
getLexer().Lex();
- // parse case like ,s0
- if (parseOptionalToken(AsmToken::Comma)) {
+ bool SeenComma = false;
+
+ // If you must include S0, then you need the comma. Fail now if it isn't there
+ if constexpr (MustIncludeS0) {
+ if (parseToken(AsmToken::Comma, "register list must include 's0' or 'x8'"))
+ return ParseStatus::Failure;
+ SeenComma = true;
+ } else {
+ SeenComma = parseOptionalToken(AsmToken::Comma);
+ }
+
+ // parse case like ,s0 - we may have already seen the comma in which case skip
+ if (SeenComma) {
if (getLexer().isNot(AsmToken::Identifier))
return Error(getLoc(), "invalid register");
StringRef RegName = getLexer().getTok().getIdentifier();
@@ -2884,6 +2905,8 @@ ParseStatus RISCVAsmParser::parseReglist(OperandVector &Operands) {
auto Encode = RISCVZC::encodeRlist(RegEnd, IsEABI);
assert(Encode != RISCVZC::INVALID_RLIST);
+ if constexpr (MustIncludeS0)
+ assert(Encode != RISCVZC::RA);
Operands.push_back(RISCVOperand::createRlist(Encode, S));
return ParseStatus::Success;
diff --git a/llvm/lib/Target/RISCV/Disassembler/RISCVDisassembler.cpp b/llvm/lib/Target/RISCV/Disassembler/RISCVDisassembler.cpp
index 93cbf662bfa32..d03351db5473b 100644
--- a/llvm/lib/Target/RISCV/Disassembler/RISCVDisassembler.cpp
+++ b/llvm/lib/Target/RISCV/Disassembler/RISCVDisassembler.cpp
@@ -507,6 +507,9 @@ static DecodeStatus decodeXTHeadMemPair(MCInst &Inst, uint32_t Insn,
static DecodeStatus decodeZcmpRlist(MCInst &Inst, uint32_t Imm,
uint64_t Address, const void *Decoder);
+static DecodeStatus decodeXqccmpRlistS0(MCInst &Inst, uint32_t Imm,
+ uint64_t Address, const void *Decoder);
+
static DecodeStatus decodeRegReg(MCInst &Inst, uint32_t Insn, uint64_t Address,
const MCDisassembler *Decoder);
@@ -621,6 +624,14 @@ static DecodeStatus decodeZcmpRlist(MCInst &Inst, uint32_t Imm,
return MCDisassembler::Success;
}
+static DecodeStatus decodeXqccmpRlistS0(MCInst &Inst, uint32_t Imm,
+ uint64_t Address, const void *Decoder) {
+ if (Imm <= 4)
+ return MCDisassembler::Fail;
+ Inst.addOperand(MCOperand::createImm(Imm));
+ return MCDisassembler::Success;
+}
+
static DecodeStatus decodeRegReg(MCInst &Inst, uint32_t Insn, uint64_t Address,
const MCDisassembler *Decoder) {
uint32_t Rs1 = fieldFromInstruction(Insn, 0, 5);
diff --git a/llvm/lib/Target/RISCV/MCTargetDesc/RISCVBaseInfo.h b/llvm/lib/Target/RISCV/MCTargetDesc/RISCVBaseInfo.h
index db305b0083415..0ede9ba7cf712 100644
--- a/llvm/lib/Target/RISCV/MCTargetDesc/RISCVBaseInfo.h
+++ b/llvm/lib/Target/RISCV/MCTargetDesc/RISCVBaseInfo.h
@@ -343,6 +343,8 @@ enum OperandType : unsigned {
OPERAND_RVKRNUM_0_7,
OPERAND_RVKRNUM_1_10,
OPERAND_RVKRNUM_2_14,
+ OPERAND_RLIST,
+ OPERAND_RLIST_S0,
OPERAND_SPIMM,
// Operand is a 3-bit rounding mode, '111' indicates FRM register.
// Represents 'frm' argument passing to floating-point operations.
diff --git a/llvm/lib/Target/RISCV/MCTargetDesc/RISCVMCCodeEmitter.cpp b/llvm/lib/Target/RISCV/MCTargetDesc/RISCVMCCodeEmitter.cpp
index e589e6171d010..6163175347ca0 100644
--- a/llvm/lib/Target/RISCV/MCTargetDesc/RISCVMCCodeEmitter.cpp
+++ b/llvm/lib/Target/RISCV/MCTargetDesc/RISCVMCCodeEmitter.cpp
@@ -104,6 +104,10 @@ class RISCVMCCodeEmitter : public MCCodeEmitter {
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const;
+ unsigned getRlistS0OpValue(const MCInst &MI, unsigned OpNo,
+ SmallVectorImpl<MCFixup> &Fixups,
+ const MCSubtargetInfo &STI) const;
+
unsigned getRegReg(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const;
@@ -621,6 +625,17 @@ unsigned RISCVMCCodeEmitter::getRlistOpValue(const MCInst &MI, unsigned OpNo,
return Imm;
}
+unsigned
+RISCVMCCodeEmitter::getRlistS0OpValue(const MCInst &MI, unsigned OpNo,
+ SmallVectorImpl<MCFixup> &Fixups,
+ const MCSubtargetInfo &STI) const {
+ const MCOperand &MO = MI.getOperand(OpNo);
+ assert(MO.isImm() && "Rlist operand must be immediate");
+ auto Imm = MO.getImm();
+ assert(Imm >= 5 && "EABI is currently not implemented");
+ return Imm;
+}
+
unsigned RISCVMCCodeEmitter::getRegReg(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
diff --git a/llvm/lib/Target/RISCV/RISCVInstrInfo.cpp b/llvm/lib/Target/RISCV/RISCVInstrInfo.cpp
index 4fb11f278df97..7867fd7d516cc 100644
--- a/llvm/lib/Target/RISCV/RISCVInstrInfo.cpp
+++ b/llvm/lib/Target/RISCV/RISCVInstrInfo.cpp
@@ -2642,6 +2642,12 @@ bool RISCVInstrInfo::verifyInstruction(const MachineInstr &MI,
case RISCVOp::OPERAND_RVKRNUM_2_14:
Ok = Imm >= 2 && Imm <= 14;
break;
+ case RISCVOp::OPERAND_RLIST:
+ Ok = Imm >= RISCVZC::RA && Imm <= RISCVZC::RA_S0_S11;
+ break;
+ case RISCVOp::OPERAND_RLIST_S0:
+ Ok = Imm >= RISCVZC::RA_S0 && Imm <= RISCVZC::RA_S0_S11;
+ break;
case RISCVOp::OPERAND_SPIMM:
Ok = (Imm & 0xf) == 0;
break;
diff --git a/llvm/lib/Target/RISCV/RISCVInstrInfoXqccmp.td b/llvm/lib/Target/RISCV/RISCVInstrInfoXqccmp.td
index 5bb9c1e4b228b..8cb1cf151f1ad 100644
--- a/llvm/lib/Target/RISCV/RISCVInstrInfoXqccmp.td
+++ b/llvm/lib/Target/RISCV/RISCVInstrInfoXqccmp.td
@@ -25,6 +25,30 @@
// Operand and SDNode transformation definitions.
//===----------------------------------------------------------------------===//
+def RlistS0AsmOperand : AsmOperandClass {
+ let Name = "RlistS0";
+ let ParserMethod = "parseReglist<true>";
+ let RenderMethod = "addRlistOperands";
+ let DiagnosticType = "InvalidRlistS0";
+ let DiagnosticString = "operand must be {ra, s0[-sN]} or {x1, x8[-x9][, x18[-xN]]}";
+}
+
+def rlist_s0 : RISCVOp<OtherVT> {
+ let ParserMatchClass = RlistS0AsmOperand;
+ let PrintMethod = "printRlist";
+ let DecoderMethod = "decodeXqccmpRlistS0";
+ let EncoderMethod = "getRlistS0OpValue";
+ let MCOperandPredicate = [{
+ int64_t Imm;
+ if (!MCOp.evaluateAsConstantImm(Imm))
+ return false;
+ // 0~4 invalid for `qc.cm.pushfp`
+ return isUInt<4>(Imm) && Imm >= 5;
+ }];
+
+ string OperandType = "OPERAND_RLIST_S0";
+}
+
//===----------------------------------------------------------------------===//
// Instruction Formats
//===----------------------------------------------------------------------===//
@@ -33,6 +57,20 @@
// Instruction Class Templates
//===----------------------------------------------------------------------===//
+class RVInstXqccmpCPPPFP<bits<5> funct5, string opcodestr,
+ DAGOperand immtype = stackadj>
+ : RVInst16<(outs), (ins rlist_s0:$rlist, immtype:$stackadj),
+ opcodestr, "$rlist, $stackadj", [], InstFormatOther> {
+ bits<4> rlist;
+ bits<16> stackadj;
+
+ let Inst{1-0} = 0b10;
+ let Inst{3-2} = stackadj{5-4};
+ let Inst{7-4} = rlist;
+ let Inst{12-8} = funct5;
+ let Inst{15-13} = 0b101;
+}
+
//===----------------------------------------------------------------------===//
// Instructions
//===----------------------------------------------------------------------===//
@@ -59,7 +97,7 @@ def QC_CM_PUSH : RVInstZcCPPP<0b11000, "qc.cm.push", negstackadj>,
ReadStoreData, ReadStoreData, ReadStoreData]>;
let hasSideEffects = 0, mayLoad = 0, mayStore = 1, Uses = [X2], Defs = [X2, X8] in
-def QC_CM_PUSHFP : RVInstZcCPPP<0b11001, "qc.cm.pushfp", negstackadj>,
+def QC_CM_PUSHFP : RVInstXqccmpCPPPFP<0b11001, "qc.cm.pushfp", negstackadj>,
Sched<[WriteIALU, WriteIALU, ReadIALU, ReadStoreData, ReadStoreData,
ReadStoreData, ReadStoreData, ReadStoreData, ReadStoreData,
ReadStoreData, ReadStoreData, ReadStoreData, ReadStoreData,
diff --git a/llvm/lib/Target/RISCV/RISCVInstrInfoZc.td b/llvm/lib/Target/RISCV/RISCVInstrInfoZc.td
index efed74ca8c870..04c10220f5bf1 100644
--- a/llvm/lib/Target/RISCV/RISCVInstrInfoZc.td
+++ b/llvm/lib/Target/RISCV/RISCVInstrInfoZc.td
@@ -58,7 +58,7 @@ def NegStackAdjAsmOperand : AsmOperandClass {
let RenderMethod = "addSpimmOperands";
}
-def rlist : Operand<OtherVT> {
+def rlist : RISCVOp<OtherVT> {
let ParserMatchClass = RlistAsmOperand;
let PrintMethod = "printRlist";
let DecoderMethod = "decodeZcmpRlist";
@@ -70,6 +70,8 @@ def rlist : Operand<OtherVT> {
// 0~3 Reserved for EABI
return isUInt<4>(Imm) && Imm >= 4;
}];
+
+ let OperandType = "OPERAND_RLIST";
}
def stackadj : RISCVOp<OtherVT> {
diff --git a/llvm/test/MC/Disassembler/RISCV/xqccmp-invalid-rlist.txt b/llvm/test/MC/Disassembler/RISCV/xqccmp-invalid-rlist.txt
new file mode 100644
index 0000000000000..fe81c01a037af
--- /dev/null
+++ b/llvm/test/MC/Disassembler/RISCV/xqccmp-invalid-rlist.txt
@@ -0,0 +1,11 @@
+# RUN: not llvm-mc -disassemble -triple=riscv32 -mattr=+experimental-xqccmp %s \
+# RUN: | FileCheck -check-prefixes=CHECK,CHECK-XQCCMP %s
+
+[0x00,0x00]
+# CHECK: unimp
+
+[0x42,0xb9]
+# CHECK-XQCCMP-NOT: qc.cm.pushfp {ra}, -{{[0-9]+}}
+
+[0x00,0x00]
+# CHECK: unimp
diff --git a/llvm/test/MC/RISCV/rv32xqccmp-invalid.s b/llvm/test/MC/RISCV/rv32xqccmp-invalid.s
index 74f96f076756c..059009de3d830 100644
--- a/llvm/test/MC/RISCV/rv32xqccmp-invalid.s
+++ b/llvm/test/MC/RISCV/rv32xqccmp-invalid.s
@@ -33,3 +33,7 @@ qc.cm.pushfp {ra, s0}, -12
# CHECK-ERROR: error: stack adjustment for register list must be a multiple of 16 bytes in the range [16, 64]
qc.cm.pop {ra, s0-s1}, -40
+
+# CHECK-ERROR: error: register list must include 's0' or 'x8'
+qc.cm.pushfp {ra}, -16
+
diff --git a/llvm/test/MC/RISCV/rv32xqccmp-valid.s b/llvm/test/MC/RISCV/rv32xqccmp-valid.s
index 5827777e524ca..b1f373ede247d 100644
--- a/llvm/test/MC/RISCV/rv32xqccmp-valid.s
+++ b/llvm/test/MC/RISCV/rv32xqccmp-valid.s
@@ -288,14 +288,6 @@ qc.cm.push {ra, s0-s11}, -112
# CHECK-ASM: encoding: [0xfe,0xb8]
qc.cm.push {x1, x8-x9, x18-x27}, -112
-# CHECK-ASM-AND-OBJ: qc.cm.pushfp {ra}, -16
-# CHECK-ASM: encoding: [0x42,0xb9]
-qc.cm.pushfp {ra}, -16
-
-# CHECK-ASM-AND-OBJ: qc.cm.pushfp {ra}, -16
-# CHECK-ASM: encoding: [0x42,0xb9]
-qc.cm.pushfp {x1}, -16
-
# CHECK-ASM-AND-OBJ: qc.cm.pushfp {ra, s0}, -32
# CHECK-ASM: encoding: [0x56,0xb9]
qc.cm.pushfp {ra, s0}, -32
diff --git a/llvm/test/MC/RISCV/rv64e-xqccmp-valid.s b/llvm/test/MC/RISCV/rv64e-xqccmp-valid.s
index 8f9e3ce7ee533..003f9852b184a 100644
--- a/llvm/test/MC/RISCV/rv64e-xqccmp-valid.s
+++ b/llvm/test/MC/RISCV/rv64e-xqccmp-valid.s
@@ -72,10 +72,6 @@ qc.cm.push {ra, s0}, -32
# CHECK-ASM: encoding: [0x62,0xb8]
qc.cm.push {ra, s0-s1}, -32
-# CHECK-ASM-AND-OBJ: qc.cm.pushfp {ra}, -16
-# CHECK-ASM: encoding: [0x42,0xb9]
-qc.cm.pushfp {ra}, -16
-
# CHECK-ASM-AND-OBJ: qc.cm.pushfp {ra, s0}, -32
# CHECK-ASM: encoding: [0x56,0xb9]
qc.cm.pushfp {ra, s0}, -32
diff --git a/llvm/test/MC/RISCV/rv64xqccmp-valid.s b/llvm/test/MC/RISCV/rv64xqccmp-valid.s
index 06ba33fe8a495..29cf6f0dfbdac 100644
--- a/llvm/test/MC/RISCV/rv64xqccmp-valid.s
+++ b/llvm/test/MC/RISCV/rv64xqccmp-valid.s
@@ -148,10 +148,6 @@ qc.cm.push {ra, s0-s11}, -112
# CHECK-ASM: encoding: [0xf6,0xb8]
qc.cm.push {ra, s0-s11}, -128
-# CHECK-ASM-AND-OBJ: qc.cm.pushfp {ra}, -16
-# CHECK-ASM: encoding: [0x42,0xb9]
-qc.cm.pushfp {ra}, -16
-
# CHECK-ASM-AND-OBJ: qc.cm.pushfp {ra, s0}, -32
# CHECK-ASM: encoding: [0x56,0xb9]
qc.cm.pushfp {ra, s0}, -32
>From e7b66e931023845488a4f52a6b5f0aa9614f5951 Mon Sep 17 00:00:00 2001
From: Sam Elliott <quic_aelliott at quicinc.com>
Date: Wed, 26 Mar 2025 18:09:31 -0700
Subject: [PATCH 2/4] Clarify Comment
---
llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp b/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp
index 19f28a6287060..fe05929d85f17 100644
--- a/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp
+++ b/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp
@@ -2826,7 +2826,11 @@ ParseStatus RISCVAsmParser::parseReglist(OperandVector &Operands) {
bool SeenComma = false;
- // If you must include S0, then you need the comma. Fail now if it isn't there
+ // There are two choices here:
+ // - `s0` is required (qc.cm.pushfp), and so we must see the comma between
+ // `ra` and `s0` and must always try to parse `s0`, below
+ // - `s0` is not required (usual case), so only try to parse `s0` if there is
+ // a comma
if constexpr (MustIncludeS0) {
if (parseToken(AsmToken::Comma, "register list must include 's0' or 'x8'"))
return ParseStatus::Failure;
@@ -2835,7 +2839,7 @@ ParseStatus RISCVAsmParser::parseReglist(OperandVector &Operands) {
SeenComma = parseOptionalToken(AsmToken::Comma);
}
- // parse case like ,s0 - we may have already seen the comma in which case skip
+ // parse case like , s0 (knowing the comma is or must be there)
if (SeenComma) {
if (getLexer().isNot(AsmToken::Identifier))
return Error(getLoc(), "invalid register");
>From df0858a249217663738bf80cb236502c1252c466 Mon Sep 17 00:00:00 2001
From: Sam Elliott <quic_aelliott at quicinc.com>
Date: Wed, 26 Mar 2025 18:50:14 -0700
Subject: [PATCH 3/4] Use Named Constants
---
llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp | 2 +-
llvm/lib/Target/RISCV/MCTargetDesc/RISCVBaseInfo.cpp | 6 +++---
2 files changed, 4 insertions(+), 4 deletions(-)
diff --git a/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp b/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp
index fe05929d85f17..0fc306ca8a258 100644
--- a/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp
+++ b/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp
@@ -477,7 +477,7 @@ struct RISCVOperand final : public MCParsedAsmOperand {
bool isSystemRegister() const { return Kind == KindTy::SystemRegister; }
bool isRegReg() const { return Kind == KindTy::RegReg; }
bool isRlist() const { return Kind == KindTy::Rlist; }
- bool isRlistS0() const { return Kind == KindTy::Rlist && Rlist.Val != 4; }
+ bool isRlistS0() const { return Kind == KindTy::Rlist && Rlist.Val != RISCVZC::RA; }
bool isSpimm() const { return Kind == KindTy::Spimm; }
bool isGPR() const {
diff --git a/llvm/lib/Target/RISCV/MCTargetDesc/RISCVBaseInfo.cpp b/llvm/lib/Target/RISCV/MCTargetDesc/RISCVBaseInfo.cpp
index 1829291cd0348..5391c522d589d 100644
--- a/llvm/lib/Target/RISCV/MCTargetDesc/RISCVBaseInfo.cpp
+++ b/llvm/lib/Target/RISCV/MCTargetDesc/RISCVBaseInfo.cpp
@@ -242,11 +242,11 @@ float RISCVLoadFPImm::getFPImm(unsigned Imm) {
void RISCVZC::printRlist(unsigned SlistEncode, raw_ostream &OS) {
OS << "{ra";
- if (SlistEncode > 4) {
+ if (SlistEncode > RISCVZC::RA) {
OS << ", s0";
- if (SlistEncode == 15)
+ if (SlistEncode == RISCVZC::RA_S0_S11)
OS << "-s11";
- else if (SlistEncode > 5 && SlistEncode <= 14)
+ else if (SlistEncode > RISCVZC::RA_S0 && SlistEncode <= RISCVZC::RA_S0_S11)
OS << "-s" << (SlistEncode - 5);
}
OS << "}";
>From e2a3edce4385c2cbb00464e3878323213c12ad02 Mon Sep 17 00:00:00 2001
From: Sam Elliott <quic_aelliott at quicinc.com>
Date: Wed, 26 Mar 2025 18:57:38 -0700
Subject: [PATCH 4/4] Address craig's feedback
---
.../Target/RISCV/AsmParser/RISCVAsmParser.cpp | 32 +++++++++----------
.../RISCV/MCTargetDesc/RISCVMCCodeEmitter.cpp | 3 +-
llvm/lib/Target/RISCV/RISCVInstrInfoXqccmp.td | 2 +-
3 files changed, 19 insertions(+), 18 deletions(-)
diff --git a/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp b/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp
index 0fc306ca8a258..5f09ca70aaec6 100644
--- a/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp
+++ b/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp
@@ -215,9 +215,13 @@ class RISCVAsmParser : public MCTargetAsmParser {
ParseStatus parseGPRPair(OperandVector &Operands, bool IsRV64Inst);
ParseStatus parseFRMArg(OperandVector &Operands);
ParseStatus parseFenceArg(OperandVector &Operands);
-
- template <bool MustIncludeS0 = false>
- ParseStatus parseReglist(OperandVector &Operands);
+ ParseStatus parseReglist(OperandVector &Operands) {
+ return parseRegListCommon(Operands, /*MustIncludeS0=*/false);
+ }
+ ParseStatus parseReglistS0(OperandVector &Operands) {
+ return parseRegListCommon(Operands, /*MustIncludeS0=*/true);
+ }
+ ParseStatus parseRegListCommon(OperandVector &Operands, bool MustIncludeS0);
ParseStatus parseRegReg(OperandVector &Operands);
ParseStatus parseRetval(OperandVector &Operands);
@@ -2798,8 +2802,7 @@ ParseStatus RISCVAsmParser::parseRegReg(OperandVector &Operands) {
return ParseStatus::Success;
}
-template <bool MustIncludeS0>
-ParseStatus RISCVAsmParser::parseReglist(OperandVector &Operands) {
+ParseStatus RISCVAsmParser::parseRegListCommon(OperandVector &Operands, bool MustIncludeS0) {
// Rlist: {ra [, s0[-sN]]}
// XRlist: {x1 [, x8[-x9][, x18[-xN]]]}
@@ -2824,22 +2827,19 @@ ParseStatus RISCVAsmParser::parseReglist(OperandVector &Operands) {
return Error(getLoc(), "register list must start from 'ra' or 'x1'");
getLexer().Lex();
- bool SeenComma = false;
+ bool SeenComma = parseOptionalToken(AsmToken::Comma);
// There are two choices here:
- // - `s0` is required (qc.cm.pushfp), and so we must see the comma between
- // `ra` and `s0` and must always try to parse `s0`, below
// - `s0` is not required (usual case), so only try to parse `s0` if there is
// a comma
- if constexpr (MustIncludeS0) {
- if (parseToken(AsmToken::Comma, "register list must include 's0' or 'x8'"))
- return ParseStatus::Failure;
- SeenComma = true;
- } else {
- SeenComma = parseOptionalToken(AsmToken::Comma);
+ // - `s0` is required (qc.cm.pushfp), and so we must see the comma between
+ // `ra` and `s0` and must always try to parse `s0`, below
+ if (MustIncludeS0 && !SeenComma) {
+ Error(getLoc(), "register list must include 's0' or 'x8'");
+ return ParseStatus::Failure;
}
- // parse case like , s0 (knowing the comma is or must be there)
+ // parse case like ,s0 (knowing the comma must be there if required)
if (SeenComma) {
if (getLexer().isNot(AsmToken::Identifier))
return Error(getLoc(), "invalid register");
@@ -2909,7 +2909,7 @@ ParseStatus RISCVAsmParser::parseReglist(OperandVector &Operands) {
auto Encode = RISCVZC::encodeRlist(RegEnd, IsEABI);
assert(Encode != RISCVZC::INVALID_RLIST);
- if constexpr (MustIncludeS0)
+ if (MustIncludeS0)
assert(Encode != RISCVZC::RA);
Operands.push_back(RISCVOperand::createRlist(Encode, S));
diff --git a/llvm/lib/Target/RISCV/MCTargetDesc/RISCVMCCodeEmitter.cpp b/llvm/lib/Target/RISCV/MCTargetDesc/RISCVMCCodeEmitter.cpp
index 6163175347ca0..6c7917b5d8b16 100644
--- a/llvm/lib/Target/RISCV/MCTargetDesc/RISCVMCCodeEmitter.cpp
+++ b/llvm/lib/Target/RISCV/MCTargetDesc/RISCVMCCodeEmitter.cpp
@@ -632,7 +632,8 @@ RISCVMCCodeEmitter::getRlistS0OpValue(const MCInst &MI, unsigned OpNo,
const MCOperand &MO = MI.getOperand(OpNo);
assert(MO.isImm() && "Rlist operand must be immediate");
auto Imm = MO.getImm();
- assert(Imm >= 5 && "EABI is currently not implemented");
+ assert(Imm >= 4 && "EABI is currently not implemented");
+ assert(Imm != RISCVZC::RA && "Rlist operand must include s0");
return Imm;
}
diff --git a/llvm/lib/Target/RISCV/RISCVInstrInfoXqccmp.td b/llvm/lib/Target/RISCV/RISCVInstrInfoXqccmp.td
index 8cb1cf151f1ad..82f15d7bdbf9a 100644
--- a/llvm/lib/Target/RISCV/RISCVInstrInfoXqccmp.td
+++ b/llvm/lib/Target/RISCV/RISCVInstrInfoXqccmp.td
@@ -27,7 +27,7 @@
def RlistS0AsmOperand : AsmOperandClass {
let Name = "RlistS0";
- let ParserMethod = "parseReglist<true>";
+ let ParserMethod = "parseReglistS0";
let RenderMethod = "addRlistOperands";
let DiagnosticType = "InvalidRlistS0";
let DiagnosticString = "operand must be {ra, s0[-sN]} or {x1, x8[-x9][, x18[-xN]]}";
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