ARM assembly aliases for add negative immediates using sub.
'add r2, #-1024' should just use 'sub r2, #1024' rather than erroring out.
Thumb1 aliases for adding a negative immediate to the stack pointer,
also.
rdar://11192734
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154123 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/ARM/AsmParser/ARMAsmParser.cpp b/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
index a558a61..e9164bc 100644
--- a/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
+++ b/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
@@ -579,6 +579,14 @@
int64_t Value = CE->getValue();
return ((Value & 3) == 0) && Value >= 0 && Value <= 508;
}
+ bool isImm0_508s4Neg() const {
+ if (!isImm()) return false;
+ const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
+ if (!CE) return false;
+ int64_t Value = -CE->getValue();
+ // explicitly exclude zero. we want that to use the normal 0_508 version.
+ return ((Value & 3) == 0) && Value > 0 && Value <= 508;
+ }
bool isImm0_255() const {
if (!isImm()) return false;
const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
@@ -586,6 +594,20 @@
int64_t Value = CE->getValue();
return Value >= 0 && Value < 256;
}
+ bool isImm0_4095() const {
+ if (!isImm()) return false;
+ const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
+ if (!CE) return false;
+ int64_t Value = CE->getValue();
+ return Value >= 0 && Value < 4096;
+ }
+ bool isImm0_4095Neg() const {
+ if (!isImm()) return false;
+ const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
+ if (!CE) return false;
+ int64_t Value = -CE->getValue();
+ return Value > 0 && Value < 4096;
+ }
bool isImm0_1() const {
if (!isImm()) return false;
const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
@@ -1499,6 +1521,14 @@
Inst.addOperand(MCOperand::CreateImm(CE->getValue() / 4));
}
+ void addImm0_508s4NegOperands(MCInst &Inst, unsigned N) const {
+ assert(N == 1 && "Invalid number of operands!");
+ // The immediate is scaled by four in the encoding and is stored
+ // in the MCInst as such. Lop off the low two bits here.
+ const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
+ Inst.addOperand(MCOperand::CreateImm(-(CE->getValue() / 4)));
+ }
+
void addImm0_508s4Operands(MCInst &Inst, unsigned N) const {
assert(N == 1 && "Invalid number of operands!");
// The immediate is scaled by four in the encoding and is stored
@@ -1557,6 +1587,14 @@
Inst.addOperand(MCOperand::CreateImm(-CE->getValue()));
}
+ void addImm0_4095NegOperands(MCInst &Inst, unsigned N) const {
+ assert(N == 1 && "Invalid number of operands!");
+ // The operand is actually an imm0_4095, but we have its
+ // negation in the assembly source, so twiddle it here.
+ const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
+ Inst.addOperand(MCOperand::CreateImm(-CE->getValue()));
+ }
+
void addARMSOImmNotOperands(MCInst &Inst, unsigned N) const {
assert(N == 1 && "Invalid number of operands!");
// The operand is actually a so_imm, but we have its bitwise