Explicitly check for non-consant reference in an LDRi12 instruction. Add FIXME
for handling the fixup necessary.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@117978 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/ARM/ARMMCCodeEmitter.cpp b/lib/Target/ARM/ARMMCCodeEmitter.cpp
index afebadc..5757046 100644
--- a/lib/Target/ARM/ARMMCCodeEmitter.cpp
+++ b/lib/Target/ARM/ARMMCCodeEmitter.cpp
@@ -178,6 +178,15 @@
// {11-0} = imm12
const MCOperand &MO = MI.getOperand(OpIdx);
const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
+ uint32_t Binary = 0;
+
+ // If The first operand isn't a register, we have a label reference.
+ if (!MO.isReg()) {
+ Binary |= ARM::PC << 13; // Rn is PC.
+ // FIXME: Add a fixup referencing the label.
+ return Binary;
+ }
+
unsigned Reg = getARMRegisterNumbering(MO.getReg());
int32_t Imm12 = MO1.getImm();
bool isAdd = Imm12 >= 0;
@@ -187,7 +196,7 @@
// Immediate is always encoded as positive. The 'U' bit controls add vs sub.
if (Imm12 < 0)
Imm12 = -Imm12;
- uint32_t Binary = Imm12 & 0xfff;
+ Binary = Imm12 & 0xfff;
if (isAdd)
Binary |= (1 << 12);
Binary |= (Reg << 13);