Thumb2 assembly parsing and encoding for LDREX/LDREXB/LDREXD/LDREXH.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139381 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/ARM/AsmParser/ARMAsmParser.cpp b/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
index afab484..b994d0f 100644
--- a/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
+++ b/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
@@ -756,6 +756,14 @@
int64_t Val = Mem.OffsetImm->getValue();
return Val >= -1020 && Val <= 1020 && (Val & 3) == 0;
}
+ bool isMemImm0_1020s4Offset() const {
+ if (Kind != Memory || Mem.OffsetRegNum != 0)
+ return false;
+ // Immediate offset a multiple of 4 in range [0, 1020].
+ if (!Mem.OffsetImm) return true;
+ int64_t Val = Mem.OffsetImm->getValue();
+ return Val >= 0 && Val <= 1020 && (Val & 3) == 0;
+ }
bool isMemImm8Offset() const {
if (Kind != Memory || Mem.OffsetRegNum != 0)
return false;
@@ -1146,6 +1154,14 @@
Inst.addOperand(MCOperand::CreateImm(Val));
}
+ void addMemImm0_1020s4OffsetOperands(MCInst &Inst, unsigned N) const {
+ assert(N == 2 && "Invalid number of operands!");
+ // The lower two bits are always zero and as such are not encoded.
+ int32_t Val = Mem.OffsetImm ? Mem.OffsetImm->getValue() / 4 : 0;
+ Inst.addOperand(MCOperand::CreateReg(Mem.BaseRegNum));
+ Inst.addOperand(MCOperand::CreateImm(Val));
+ }
+
void addMemImm8OffsetOperands(MCInst &Inst, unsigned N) const {
assert(N == 2 && "Invalid number of operands!");
int64_t Val = Mem.OffsetImm ? Mem.OffsetImm->getValue() : 0;