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[RISCV] Use consume_front to parse rv32/rv64 in RISCVISAInfo::parse*ArchString. NFC #90562

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Merged
merged 1 commit into from
Apr 30, 2024
Merged

[RISCV] Use consume_front to parse rv32/rv64 in RISCVISAInfo::parse*ArchString. NFC #90562

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33 changes: 18 additions & 15 deletions llvm/lib/TargetParser/RISCVISAInfo.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -430,17 +430,17 @@ RISCVISAInfo::parseNormalizedArchString(StringRef Arch) {
"string must be lowercase");
}
// Must start with a valid base ISA name.
unsigned XLen;
if (Arch.starts_with("rv32i") || Arch.starts_with("rv32e"))
unsigned XLen = 0;
if (Arch.consume_front("rv32"))
XLen = 32;
else if (Arch.starts_with("rv64i") || Arch.starts_with("rv64e"))
else if (Arch.consume_front("rv64"))
XLen = 64;
else

if (XLen == 0 || Arch.empty() || (Arch[0] != 'i' && Arch[0] != 'e'))
return createStringError(errc::invalid_argument,
"arch string must begin with valid base ISA");

std::unique_ptr<RISCVISAInfo> ISAInfo(new RISCVISAInfo(XLen));
// Discard rv32/rv64 prefix.
Arch = Arch.substr(4);

// Each extension is of the form ${name}${major_version}p${minor_version}
// and separated by _. Split by _ and then extract the name and version
Expand Down Expand Up @@ -616,36 +616,39 @@ RISCVISAInfo::parseArchString(StringRef Arch, bool EnableExperimentalExtension,
ExperimentalExtensionVersionCheck, IgnoreUnknown);
}

bool HasRV64 = Arch.starts_with("rv64");
// ISA string must begin with rv32 or rv64.
if (!(Arch.starts_with("rv32") || HasRV64) || (Arch.size() < 5)) {
unsigned XLen = 0;
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Might be worth making this into a subroutine to share.

if (Arch.consume_front("rv32"))
XLen = 32;
else if (Arch.consume_front("rv64"))
XLen = 64;

if (XLen == 0 || Arch.empty())
return createStringError(
errc::invalid_argument,
"string must begin with rv32{i,e,g} or rv64{i,e,g}");
}

unsigned XLen = HasRV64 ? 64 : 32;
std::unique_ptr<RISCVISAInfo> ISAInfo(new RISCVISAInfo(XLen));
MapVector<std::string, RISCVISAUtils::ExtensionVersion,
std::map<std::string, unsigned>>
SeenExtMap;

// The canonical order specified in ISA manual.
// Ref: Table 22.1 in RISC-V User-Level ISA V2.2
char Baseline = Arch[4];
char Baseline = Arch.front();

// First letter should be 'e', 'i' or 'g'.
switch (Baseline) {
default:
return createStringError(errc::invalid_argument,
"first letter after \'" + Arch.slice(0, 4) +
"first letter after \'rv" + Twine(XLen) +
"\' should be 'e', 'i' or 'g'");
case 'e':
case 'i':
break;
case 'g':
// g expands to extensions in RISCVGImplications.
if (Arch.size() > 5 && isDigit(Arch[5]))
if (Arch.size() > 1 && isDigit(Arch[1]))
return createStringError(errc::invalid_argument,
"version not supported for 'g'");
break;
Expand All @@ -655,8 +658,8 @@ RISCVISAInfo::parseArchString(StringRef Arch, bool EnableExperimentalExtension,
return createStringError(errc::invalid_argument,
"extension name missing after separator '_'");

// Skip rvxxx
StringRef Exts = Arch.substr(5);
// Skip baseline.
StringRef Exts = Arch.drop_front(1);

unsigned Major, Minor, ConsumeLength;
if (Baseline == 'g') {
Expand Down