Add support for floating point immediates to MC instruction printing. ARM

VFP instructions use it for loading some constants, so implement that
handling.

Not thrilled with adding a member to MCOperand, but not sure there's much of
a better option that's not pretty fragile (like putting a double in the
union instead and just assuming that's good enough). Suggestions welcome...

llvm-svn: 113996

2 files changed, 6 insertions, 2 deletions

diff --git a/llvm/lib/Target/ARM/ARMMCInstLower.cpp b/llvm/lib/Target/ARM/ARMMCInstLower.cpp
index 41af0889d78..b26d327e363 100644
--- a/llvm/lib/Target/ARM/ARMMCInstLower.cpp
+++ b/llvm/lib/Target/ARM/ARMMCInstLower.cpp
@@ -16,6 +16,7 @@
 #include "ARMMCInstLower.h"
 //#include "llvm/CodeGen/MachineModuleInfoImpls.h"
 #include "llvm/CodeGen/AsmPrinter.h"
+#include "llvm/Constants.h"
 #include "llvm/CodeGen/MachineBasicBlock.h"
 #include "llvm/MC/MCAsmInfo.h"
 #include "llvm/MC/MCContext.h"
@@ -155,6 +156,9 @@ void ARMMCInstLower::Lower(const MachineInstr *MI, MCInst &OutMI) const {
       MCOp = LowerSymbolOperand(MO, Printer.GetBlockAddressSymbol(
                                               MO.getBlockAddress()));
       break;
+    case MachineOperand::MO_FPImmediate:
+      MCOp = MCOperand::CreateFPImm(MO.getFPImm()->getValueAPF());
+      break;
     }
 
     OutMI.addOperand(MCOp);
diff --git a/llvm/lib/Target/ARM/AsmPrinter/ARMInstPrinter.cpp b/llvm/lib/Target/ARM/AsmPrinter/ARMInstPrinter.cpp
index 000108a7cc7..344273f72bb 100644
--- a/llvm/lib/Target/ARM/AsmPrinter/ARMInstPrinter.cpp
+++ b/llvm/lib/Target/ARM/AsmPrinter/ARMInstPrinter.cpp
@@ -729,12 +729,12 @@ void ARMInstPrinter::printT2AddrModeSoRegOperand(const MCInst *MI,
 
 void ARMInstPrinter::printVFPf32ImmOperand(const MCInst *MI, unsigned OpNum,
                                            raw_ostream &O) {
-  O << '#' << MI->getOperand(OpNum).getImm();
+  O << '#' << MI->getOperand(OpNum).getFPImm().convertToFloat();
 }
 
 void ARMInstPrinter::printVFPf64ImmOperand(const MCInst *MI, unsigned OpNum,
                                            raw_ostream &O) {
-  O << '#' << MI->getOperand(OpNum).getImm();
+  O << '#' << MI->getOperand(OpNum).getFPImm().convertToDouble();
 }
 
 void ARMInstPrinter::printNEONModImmOperand(const MCInst *MI, unsigned OpNum,