Teach the x86 mc assembler that %dr6 = %db6, this implements
rdar://8013734
llvm-svn: 106725
diff --git a/llvm/lib/Target/X86/AsmParser/X86AsmLexer.cpp b/llvm/lib/Target/X86/AsmParser/X86AsmLexer.cpp
index 66be489..26797ab 100644
--- a/llvm/lib/Target/X86/AsmParser/X86AsmLexer.cpp
+++ b/llvm/lib/Target/X86/AsmParser/X86AsmLexer.cpp
@@ -88,6 +88,8 @@
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 @@
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;
}
}