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Insert workaround for GAS bug in assembling FLD/FSTP XWORD PTR [...] 

instructions, by outputting them as bytes.

llvm-svn: 7115
This commit is contained in:
Brian Gaeke 2003-07-07 18:34:20 +00:00
parent c1db0fdd7e
commit c48e3fdffd
1 changed files with 31 additions and 2 deletions
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33
llvm/lib/Target/X86/Printer.cpp
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@ -1,7 +1,7 @@
//===-- X86/Printer.cpp - Convert X86 code to human readable rep. ---------===//
//
// This file contains a printer that converts from our internal representation
// of LLVM code to a nice human readable form that is suitable for debuggging.
// of LLVM code to a nice human readable form that is suitable for debugging.
//
//===----------------------------------------------------------------------===//
@ -819,7 +819,36 @@ void Printer::printMachineInstruction(const MachineInstr *MI, std::ostream &O,
isMem(MI, 0) && "Bad MRMSxM format!");
assert((MI->getNumOperands() != 5 || MI->getOperand(4).isImmediate()) &&
"Bad MRMSxM format!");
// Work around GNU assembler bugs in FSTP and FLD.
if (MI->getOpCode() == X86::FSTPr80) {
if ((MI->getOperand(0).getReg() == X86::ESP)
&& (MI->getOperand(1).getImmedValue() == 1)) {
int DispVal = MI->getOperand(3).getImmedValue();
if ((DispVal < -128) || (DispVal > 127)) { // 4 byte disp.
unsigned int val = (unsigned int) DispVal;
O << ".byte 0xdb, 0xbc, 0x24\n\t";
O << ".long 0x" << std::hex << (unsigned) val << std::dec << "\t# ";
} else { // 1 byte disp.
unsigned char val = (unsigned char) DispVal;
O << ".byte 0xdb, 0x7c, 0x24, 0x" << std::hex << (unsigned) val
<< std::dec << "\t# ";
}
}
} else if (MI->getOpCode() == X86::FLDr80) {
if ((MI->getOperand(0).getReg() == X86::ESP)
&& (MI->getOperand(1).getImmedValue() == 1)) {
int DispVal = MI->getOperand(3).getImmedValue();
if ((DispVal < -128) || (DispVal > 127)) { // 4 byte disp.
unsigned int val = (unsigned int) DispVal;
O << ".byte 0xdb, 0xac, 0x24\n\t";
O << ".long 0x" << std::hex << (unsigned) val << std::dec << "\t# ";
} else { // 1 byte disp.
unsigned char val = (unsigned char) DispVal;
O << ".byte 0xdb, 0x6c, 0x24, 0x" << std::hex << (unsigned) val
<< std::dec << "\t# ";
}
}
}
O << TII.getName(MI->getOpCode()) << " ";
O << sizePtr(Desc) << " ";
printMemReference(O, MI, 0, RI);