diff options
| -rw-r--r-- | lib/Target/X86/X86ISelLowering.cpp | 26 |
1 files changed, 25 insertions, 1 deletions
diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp index b80690dc2c..884efcb16e 100644 --- a/lib/Target/X86/X86ISelLowering.cpp +++ b/lib/Target/X86/X86ISelLowering.cpp @@ -9324,15 +9324,39 @@ X86TargetLowering::getRegForInlineAsmConstraint(const std::string &Constraint, // Not found as a standard register? if (Res.second == 0) { - // GCC calls "st(0)" just plain "st". + // Map st(0) -> st(7) -> ST0 + if (Constraint.size() == 7 && Constraint[0] == '{' && + tolower(Constraint[1]) == 's' && + tolower(Constraint[2]) == 't' && + Constraint[3] == '(' && + (Constraint[4] >= '0' && Constraint[4] <= '7') && + Constraint[5] == ')' && + Constraint[6] == '}') { + + Res.first = X86::ST0+Constraint[4]-'0'; + Res.second = X86::RFP80RegisterClass; + return Res; + } + + // GCC allows "st(0)" to be called just plain "st". if (StringsEqualNoCase("{st}", Constraint)) { Res.first = X86::ST0; Res.second = X86::RFP80RegisterClass; + return Res; } + + // flags -> EFLAGS + if (StringsEqualNoCase("{flags}", Constraint)) { + Res.first = X86::EFLAGS; + Res.second = X86::CCRRegisterClass; + return Res; + } + // 'A' means EAX + EDX. if (Constraint == "A") { Res.first = X86::EAX; Res.second = X86::GR32_ADRegisterClass; + return Res; } return Res; } |