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Teach the x86 mc assembler that %dr6 = %db6, this implements

Browse Source 
rdar://8013734


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106725 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2010-06-24 07:29:18 +00:00
parent adabe1a92c
commit 645b209c4a
3 changed files with 62 additions and 2 deletions
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32
lib/Target/X86/AsmParser/X86AsmLexer.cpp
View File

@ -88,6 +88,8 @@ AsmToken X86AsmLexer::LexTokenATT() {
if (unsigned regID = MatchRegisterName(nextToken.getString())) {
lexDefinite();
// FIXME: This is completely wrong when there is a space or other
// punctuation between the % and the register name.
StringRef regStr(lexedToken.getString().data(),
lexedToken.getString().size() +
nextToken.getString().size());
@ -96,6 +98,36 @@ AsmToken X86AsmLexer::LexTokenATT() {
static_cast<int64_t>(regID));
}
// Match register name failed. If this is "db[0-7]", match it as an alias
// for dr[0-7].
if (nextToken.getString().size() == 3 &&
nextToken.getString().startswith("db")) {
int RegNo = -1;
switch (nextToken.getString()[2]) {
case '0': RegNo = X86::DR0; break;
case '1': RegNo = X86::DR1; break;
case '2': RegNo = X86::DR2; break;
case '3': RegNo = X86::DR3; break;
case '4': RegNo = X86::DR4; break;
case '5': RegNo = X86::DR5; break;
case '6': RegNo = X86::DR6; break;
case '7': RegNo = X86::DR7; break;
}
if (RegNo != -1) {
lexDefinite();
// FIXME: This is completely wrong when there is a space or other
// punctuation between the % and the register name.
StringRef regStr(lexedToken.getString().data(),
lexedToken.getString().size() +
nextToken.getString().size());
return AsmToken(AsmToken::Register, regStr,
static_cast<int64_t>(RegNo));
}
}
return lexedToken;
}
}

22
lib/Target/X86/AsmParser/X86AsmParser.cpp
View File

@ -412,6 +412,28 @@ bool X86ATTAsmParser::ParseRegister(unsigned &RegNo,
return false;
}
// If this is "db[0-7]", match it as an alias
// for dr[0-7].
if (RegNo == 0 && Tok.getString().size() == 3 &&
Tok.getString().startswith("db")) {
switch (Tok.getString()[2]) {
case '0': RegNo = X86::DR0; break;
case '1': RegNo = X86::DR1; break;
case '2': RegNo = X86::DR2; break;
case '3': RegNo = X86::DR3; break;
case '4': RegNo = X86::DR4; break;
case '5': RegNo = X86::DR5; break;
case '6': RegNo = X86::DR6; break;
case '7': RegNo = X86::DR7; break;
}
if (RegNo != 0) {
EndLoc = Tok.getLoc();
Parser.Lex(); // Eat it.
return false;
}
}
if (RegNo == 0)
return Error(Tok.getLoc(), "invalid register name");

10
test/MC/AsmParser/X86/x86_64-operands.s
View File

@ -1,5 +1,3 @@
// FIXME: Actually test that we get the expected results.
// RUN: llvm-mc -triple x86_64-unknown-unknown %s | FileCheck %s
# CHECK: callq a
@ -7,3 +5,11 @@
# CHECK: leaq -40(%rbp), %r15
leaq -40(%rbp), %r15
// rdar://8013734 - Alias dr6=db6
mov %dr6, %rax
mov %db6, %rax
# CHECK: movq %dr6, %rax
# CHECK: movq %dr6, %rax