+ ASSERT(imm.isUInt12());
+
+ if (!((rt | rn) & 8) && imm.isUInt7())
+ m_formatter.oneWordOp5Imm5Reg3Reg3(OP_STRH_imm_T1, imm.getUInt7() >> 2, rn, rt);
+ else
+ m_formatter.twoWordOp12Reg4Reg4Imm12(OP_STRH_imm_T2, rn, rt, imm.getUInt12());
+ }
+
+ // If index is set, this is a regular offset or a pre-indexed store;
+ // if index is not set then is is a post-index store.
+ //
+ // If wback is set rn is updated - this is a pre or post index store,
+ // if wback is not set this is a regular offset memory access.
+ //
+ // (-255 <= offset <= 255)
+ // _reg = REG[rn]
+ // _tmp = _reg + offset
+ // MEM[index ? _tmp : _reg] = REG[rt]
+ // if (wback) REG[rn] = _tmp
+ ALWAYS_INLINE void strh(RegisterID rt, RegisterID rn, int offset, bool index, bool wback)
+ {
+ ASSERT(rt != ARMRegisters::pc);
+ ASSERT(rn != ARMRegisters::pc);
+ ASSERT(index || wback);
+ ASSERT(!wback | (rt != rn));
+
+ bool add = true;
+ if (offset < 0) {
+ add = false;
+ offset = -offset;
+ }
+ ASSERT(!(offset & ~0xff));
+
+ offset |= (wback << 8);
+ offset |= (add << 9);
+ offset |= (index << 10);
+ offset |= (1 << 11);
+
+ m_formatter.twoWordOp12Reg4Reg4Imm12(OP_STRH_imm_T3, rn, rt, offset);
+ }
+
+ // rt == ARMRegisters::pc only allowed if last instruction in IT (if then) block.
+ ALWAYS_INLINE void strh(RegisterID rt, RegisterID rn, RegisterID rm, unsigned shift = 0)
+ {
+ ASSERT(rn != ARMRegisters::pc);
+ ASSERT(!BadReg(rm));
+ ASSERT(shift <= 3);
+
+ if (!shift && !((rt | rn | rm) & 8))
+ m_formatter.oneWordOp7Reg3Reg3Reg3(OP_STRH_reg_T1, rm, rn, rt);
+ else
+ m_formatter.twoWordOp12Reg4FourFours(OP_STRH_reg_T2, rn, FourFours(rt, 0, shift, rm));
+ }
+
+ ALWAYS_INLINE void sub(RegisterID rd, RegisterID rn, ARMThumbImmediate imm)
+ {
+ // Rd can only be SP if Rn is also SP.
+ ASSERT((rd != ARMRegisters::sp) || (rn == ARMRegisters::sp));
+ ASSERT(rd != ARMRegisters::pc);
+ ASSERT(rn != ARMRegisters::pc);
+ ASSERT(imm.isValid());
+
+ if ((rn == ARMRegisters::sp) && (rd == ARMRegisters::sp) && imm.isUInt9()) {
+ ASSERT(!(imm.getUInt16() & 3));
+ m_formatter.oneWordOp9Imm7(OP_SUB_SP_imm_T1, static_cast<uint8_t>(imm.getUInt9() >> 2));
+ return;
+ } else if (!((rd | rn) & 8)) {
+ if (imm.isUInt3()) {
+ m_formatter.oneWordOp7Reg3Reg3Reg3(OP_SUB_imm_T1, (RegisterID)imm.getUInt3(), rn, rd);
+ return;
+ } else if ((rd == rn) && imm.isUInt8()) {
+ m_formatter.oneWordOp5Reg3Imm8(OP_SUB_imm_T2, rd, imm.getUInt8());
+ return;
+ }
+ }
+
+ if (imm.isEncodedImm())
+ m_formatter.twoWordOp5i6Imm4Reg4EncodedImm(OP_SUB_imm_T3, rn, rd, imm);
+ else {
+ ASSERT(imm.isUInt12());
+ m_formatter.twoWordOp5i6Imm4Reg4EncodedImm(OP_SUB_imm_T4, rn, rd, imm);
+ }
+ }
+
+ ALWAYS_INLINE void sub(RegisterID rd, ARMThumbImmediate imm, RegisterID rn)
+ {
+ ASSERT(rd != ARMRegisters::pc);
+ ASSERT(rn != ARMRegisters::pc);
+ ASSERT(imm.isValid());
+ ASSERT(imm.isUInt12());
+
+ if (!((rd | rn) & 8) && !imm.getUInt12())
+ m_formatter.oneWordOp10Reg3Reg3(OP_RSB_imm_T1, rn, rd);
+ else
+ m_formatter.twoWordOp5i6Imm4Reg4EncodedImm(OP_RSB_imm_T2, rn, rd, imm);
+ }
+
+ ALWAYS_INLINE void sub(RegisterID rd, RegisterID rn, RegisterID rm, ShiftTypeAndAmount shift)
+ {
+ ASSERT((rd != ARMRegisters::sp) || (rn == ARMRegisters::sp));
+ ASSERT(rd != ARMRegisters::pc);
+ ASSERT(rn != ARMRegisters::pc);
+ ASSERT(!BadReg(rm));
+ m_formatter.twoWordOp12Reg4FourFours(OP_SUB_reg_T2, rn, FourFours(shift.hi4(), rd, shift.lo4(), rm));
+ }
+
+ // NOTE: In an IT block, add doesn't modify the flags register.
+ ALWAYS_INLINE void sub(RegisterID rd, RegisterID rn, RegisterID rm)
+ {
+ if (!((rd | rn | rm) & 8))
+ m_formatter.oneWordOp7Reg3Reg3Reg3(OP_SUB_reg_T1, rm, rn, rd);
+ else
+ sub(rd, rn, rm, ShiftTypeAndAmount());
+ }
+
+ // Not allowed in an IT (if then) block.
+ void sub_S(RegisterID rd, RegisterID rn, ARMThumbImmediate imm)
+ {
+ // Rd can only be SP if Rn is also SP.
+ ASSERT((rd != ARMRegisters::sp) || (rn == ARMRegisters::sp));
+ ASSERT(rd != ARMRegisters::pc);
+ ASSERT(rn != ARMRegisters::pc);
+ ASSERT(imm.isValid());
+
+ if ((rn == ARMRegisters::sp) && (rd == ARMRegisters::sp) && imm.isUInt9()) {
+ ASSERT(!(imm.getUInt16() & 3));
+ m_formatter.oneWordOp9Imm7(OP_SUB_SP_imm_T1, static_cast<uint8_t>(imm.getUInt9() >> 2));
+ return;
+ } else if (!((rd | rn) & 8)) {
+ if (imm.isUInt3()) {
+ m_formatter.oneWordOp7Reg3Reg3Reg3(OP_SUB_imm_T1, (RegisterID)imm.getUInt3(), rn, rd);
+ return;
+ } else if ((rd == rn) && imm.isUInt8()) {
+ m_formatter.oneWordOp5Reg3Imm8(OP_SUB_imm_T2, rd, imm.getUInt8());
projects / apple / javascriptcore.git / blobdiff