unsigned emitAdd(MVT RetVT, const Value *LHS, const Value *RHS,
bool SetFlags = false, bool WantResult = true,
bool IsZExt = false);
+ unsigned emitAdd_ri_(MVT VT, unsigned Op0, bool Op0IsKill, int64_t Imm);
unsigned emitSub(MVT RetVT, const Value *LHS, const Value *RHS,
bool SetFlags = false, bool WantResult = true,
bool IsZExt = false);
// reg+offset into a register.
if (ImmediateOffsetNeedsLowering) {
unsigned ResultReg;
- if (Addr.getReg()) {
+ if (Addr.getReg())
// Try to fold the immediate into the add instruction.
- if (Offset < 0)
- ResultReg = emitAddSub_ri(/*UseAdd=*/false, MVT::i64, Addr.getReg(),
- /*IsKill=*/false, -Offset);
- else
- ResultReg = emitAddSub_ri(/*UseAdd=*/true, MVT::i64, Addr.getReg(),
- /*IsKill=*/false, Offset);
- if (!ResultReg) {
- unsigned ImmReg = fastEmit_i(MVT::i64, MVT::i64, ISD::Constant, Offset);
- ResultReg = emitAddSub_rr(/*UseAdd=*/true, MVT::i64, Addr.getReg(),
- /*IsKill=*/false, ImmReg, /*IsKill=*/true);
- }
- } else
+ ResultReg = emitAdd_ri_(MVT::i64, Addr.getReg(), /*IsKill=*/false, Offset);
+ else
ResultReg = fastEmit_i(MVT::i64, MVT::i64, ISD::Constant, Offset);
if (!ResultReg)
IsZExt);
}
+/// \brief This method is a wrapper to simplify add emission.
+///
+/// First try to emit an add with an immediate operand using emitAddSub_ri. If
+/// that fails, then try to materialize the immediate into a register and use
+/// emitAddSub_rr instead.
+unsigned AArch64FastISel::emitAdd_ri_(MVT VT, unsigned Op0, bool Op0IsKill,
+ int64_t Imm) {
+ unsigned ResultReg;
+ if (Imm < 0)
+ ResultReg = emitAddSub_ri(false, VT, Op0, Op0IsKill, -Imm);
+ else
+ ResultReg = emitAddSub_ri(true, VT, Op0, Op0IsKill, Imm);
+
+ if (ResultReg)
+ return ResultReg;
+
+ unsigned CReg = fastEmit_i(VT, VT, ISD::Constant, Imm);
+ if (!CReg)
+ return 0;
+
+ ResultReg = emitAddSub_rr(true, VT, Op0, Op0IsKill, CReg, true);
+ return ResultReg;
+}
+
unsigned AArch64FastISel::emitSub(MVT RetVT, const Value *LHS, const Value *RHS,
bool SetFlags, bool WantResult, bool IsZExt) {
return emitAddSub(/*UseAdd=*/false, RetVT, LHS, RHS, SetFlags, WantResult,