Add support for Thumb2 literal loads with negative zero offset
Thumb2 literal loads use an offset encoding which allows for
negative zero. This fixes parsing and encoding so that #-0
is correctly processed. The parser represents #-0 as INT32_MIN.
llvm-svn: 188549
diff --git a/llvm/lib/Target/ARM/AsmParser/ARMAsmParser.cpp b/llvm/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
index d48ece1..df9306a 100644
--- a/llvm/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
+++ b/llvm/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
@@ -1793,8 +1793,6 @@
void addMemPCRelImm12Operands(MCInst &Inst, unsigned N) const {
assert(N == 1 && "Invalid number of operands!");
int32_t Imm = Memory.OffsetImm->getValue();
- // FIXME: Handle #-0
- if (Imm == INT32_MIN) Imm = 0;
Inst.addOperand(MCOperand::CreateImm(Imm));
}
diff --git a/llvm/lib/Target/ARM/MCTargetDesc/ARMMCCodeEmitter.cpp b/llvm/lib/Target/ARM/MCTargetDesc/ARMMCCodeEmitter.cpp
index c0c21d3..a247b02 100644
--- a/llvm/lib/Target/ARM/MCTargetDesc/ARMMCCodeEmitter.cpp
+++ b/llvm/lib/Target/ARM/MCTargetDesc/ARMMCCodeEmitter.cpp
@@ -778,8 +778,10 @@
} else {
Reg = ARM::PC;
int32_t Offset = MO.getImm();
- // FIXME: Handle #-0.
- if (Offset < 0) {
+ if (Offset == INT32_MIN) {
+ Offset = 0;
+ isAdd = false;
+ } else if (Offset < 0) {
Offset *= -1;
isAdd = false;
}