text: /*
   *    Stack-less Just-In-Time compiler
   *
   *    Copyright Zoltan Herczeg (hzmester@freemail.hu). All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without modification, are
   * permitted provided that the following conditions are met:
   *
   *   1. Redistributions of source code must retain the above copyright notice, this list of
   *      conditions and the following disclaimer.
   *
   *   2. Redistributions in binary form must reproduce the above copyright notice, this list
   *      of conditions and the following disclaimer in the documentation and/or other materials
   *      provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) AND CONTRIBUTORS ``AS IS'' AND ANY
   * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
   * SHALL THE COPYRIGHT HOLDER(S) OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
   * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
   * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
   * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
   * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  /* ppc 32-bit arch dependent functions. */
  
  static sljit_s32 load_immediate(struct sljit_compiler *compiler, sljit_s32 reg, sljit_sw imm)
  {
  	if (imm <= SIMM_MAX && imm >= SIMM_MIN)
  		return push_inst(compiler, ADDI | D(reg) | A(0) | IMM(imm));
  
  	if (!(imm & ~0xffff))
  		return push_inst(compiler, ORI | S(TMP_ZERO) | A(reg) | IMM(imm));
  
  	FAIL_IF(push_inst(compiler, ADDIS | D(reg) | A(0) | IMM(imm >> 16)));
  	return (imm & 0xffff) ? push_inst(compiler, ORI | S(reg) | A(reg) | IMM(imm)) : SLJIT_SUCCESS;
  }
  
  #define INS_CLEAR_LEFT(dst, src, from) \
  	(RLWINM | S(src) | A(dst) | ((from) << 6) | (31 << 1))
  
  static SLJIT_INLINE sljit_s32 emit_single_op(struct sljit_compiler *compiler, sljit_s32 op, sljit_s32 flags,
  	sljit_s32 dst, sljit_s32 src1, sljit_s32 src2)
  {
  	switch (op) {
  	case SLJIT_MOV:
  	case SLJIT_MOV_U32:
  	case SLJIT_MOV_S32:
  	case SLJIT_MOV_P:
  		SLJIT_ASSERT(src1 == TMP_REG1);
  		if (dst != src2)
  			return push_inst(compiler, OR | S(src2) | A(dst) | B(src2));
  		return SLJIT_SUCCESS;
  
  	case SLJIT_MOV_U8:
  	case SLJIT_MOV_S8:
  		SLJIT_ASSERT(src1 == TMP_REG1);
  		if ((flags & (REG_DEST | REG2_SOURCE)) == (REG_DEST | REG2_SOURCE)) {
  			if (op == SLJIT_MOV_S8)
  				return push_inst(compiler, EXTSB | S(src2) | A(dst));
  			return push_inst(compiler, INS_CLEAR_LEFT(dst, src2, 24));
  		}
  		else if ((flags & REG_DEST) && op == SLJIT_MOV_S8)
  			return push_inst(compiler, EXTSB | S(src2) | A(dst));
  		else {
  			SLJIT_ASSERT(dst == src2);
  		}
  		return SLJIT_SUCCESS;
  
  	case SLJIT_MOV_U16:
  	case SLJIT_MOV_S16:
  		SLJIT_ASSERT(src1 == TMP_REG1);
  		if ((flags & (REG_DEST | REG2_SOURCE)) == (REG_DEST | REG2_SOURCE)) {
  			if (op == SLJIT_MOV_S16)
  				return push_inst(compiler, EXTSH | S(src2) | A(dst));
  			return push_inst(compiler, INS_CLEAR_LEFT(dst, src2, 16));
  		}
  		else {
  			SLJIT_ASSERT(dst == src2);
  		}
  		return SLJIT_SUCCESS;
  
  	case SLJIT_NOT:
  		SLJIT_ASSERT(src1 == TMP_REG1);
  		return push_inst(compiler, NOR | RC(flags) | S(src2) | A(dst) | B(src2));
  
  	case SLJIT_NEG:
  		SLJIT_ASSERT(src1 == TMP_REG1);
  		/* Setting XER SO is not enough, CR SO is also needed. */
  		return push_inst(compiler, NEG | OE((flags & ALT_FORM1) ? ALT_SET_FLAGS : 0) | RC(flags) | D(dst) | A(src2));
  
  	case SLJIT_CLZ:
  		SLJIT_ASSERT(src1 == TMP_REG1);
  		return push_inst(compiler, CNTLZW | S(src2) | A(dst));
  
  	case SLJIT_ADD:
  		if (flags & ALT_FORM1) {
  			/* Setting XER SO is not enough, CR SO is also needed. */
  			return push_inst(compiler, ADD | OE(ALT_SET_FLAGS) | RC(ALT_SET_FLAGS) | D(dst) | A(src1) | B(src2));
  		}
  
  		if (flags & ALT_FORM2) {
  			/* Flags does not set: BIN_IMM_EXTS unnecessary. */
  			SLJIT_ASSERT(src2 == TMP_REG2);
  
  			if (flags & ALT_FORM3)
  				return push_inst(compiler, ADDIS | D(dst) | A(src1) | compiler->imm);
  
  			if (flags & ALT_FORM4) {
  				FAIL_IF(push_inst(compiler, ADDIS | D(dst) | A(src1) | (((compiler->imm >> 16) & 0xffff) + ((compiler->imm >> 15) & 0x1))));
  				src1 = dst;
  			}
  
  			return push_inst(compiler, ADDI | D(dst) | A(src1) | (compiler->imm & 0xffff));
  		}
  		if (flags & ALT_FORM3) {
  			SLJIT_ASSERT(src2 == TMP_REG2);
  			return push_inst(compiler, ADDIC | D(dst) | A(src1) | compiler->imm);
  		}
  		if (!(flags & ALT_SET_FLAGS))
  			return push_inst(compiler, ADD | D(dst) | A(src1) | B(src2));
  		if (flags & ALT_FORM4)
  			return push_inst(compiler, ADDC | RC(ALT_SET_FLAGS) | D(dst) | A(src1) | B(src2));
  		return push_inst(compiler, ADD | RC(flags) | D(dst) | A(src1) | B(src2));
  
  	case SLJIT_ADDC:
  		return push_inst(compiler, ADDE | D(dst) | A(src1) | B(src2));
  
  	case SLJIT_SUB:
  		if (flags & ALT_FORM1) {
  			if (flags & ALT_FORM2) {
  				FAIL_IF(push_inst(compiler, CMPLI | CRD(0) | A(src1) | compiler->imm));
  				if (!(flags & ALT_FORM3))
  					return SLJIT_SUCCESS;
  				return push_inst(compiler, ADDI | D(dst) | A(src1) | (-compiler->imm & 0xffff));
  			}
  			FAIL_IF(push_inst(compiler, CMPL | CRD(0) | A(src1) | B(src2)));
  			if (!(flags & ALT_FORM3))
  				return SLJIT_SUCCESS;
  			return push_inst(compiler, SUBF | D(dst) | A(src2) | B(src1));
  		}
  
  		if (flags & ALT_FORM2) {
  			/* Setting XER SO is not enough, CR SO is also needed. */
  			return push_inst(compiler, SUBF | OE(ALT_SET_FLAGS) | RC(ALT_SET_FLAGS) | D(dst) | A(src2) | B(src1));
  		}
  
  		if (flags & ALT_FORM3) {
  			/* Flags does not set: BIN_IMM_EXTS unnecessary. */
  			SLJIT_ASSERT(src2 == TMP_REG2);
  			return push_inst(compiler, SUBFIC | D(dst) | A(src1) | compiler->imm);
  		}
  
  		if (flags & ALT_FORM4) {
  			if (flags & ALT_FORM5) {
  				SLJIT_ASSERT(src2 == TMP_REG2);
  				return push_inst(compiler, CMPI | CRD(0) | A(src1) | compiler->imm);
  			}
  			return push_inst(compiler, CMP | CRD(0) | A(src1) | B(src2));
  		}
  
  		if (!(flags & ALT_SET_FLAGS))
  			return push_inst(compiler, SUBF | D(dst) | A(src2) | B(src1));
  		if (flags & ALT_FORM5)
  			return push_inst(compiler, SUBFC | RC(ALT_SET_FLAGS) | D(dst) | A(src2) | B(src1));
  		return push_inst(compiler, SUBF | RC(flags) | D(dst) | A(src2) | B(src1));
  
  	case SLJIT_SUBC:
  		return push_inst(compiler, SUBFE | D(dst) | A(src2) | B(src1));
  
  	case SLJIT_MUL:
  		if (flags & ALT_FORM1) {
  			SLJIT_ASSERT(src2 == TMP_REG2);
  			return push_inst(compiler, MULLI | D(dst) | A(src1) | compiler->imm);
  		}
  		return push_inst(compiler, MULLW | OE(flags) | RC(flags) | D(dst) | A(src2) | B(src1));
  
  	case SLJIT_AND:
  		if (flags & ALT_FORM1) {
  			SLJIT_ASSERT(src2 == TMP_REG2);
  			return push_inst(compiler, ANDI | S(src1) | A(dst) | compiler->imm);
  		}
  		if (flags & ALT_FORM2) {
  			SLJIT_ASSERT(src2 == TMP_REG2);
  			return push_inst(compiler, ANDIS | S(src1) | A(dst) | compiler->imm);
  		}
  		return push_inst(compiler, AND | RC(flags) | S(src1) | A(dst) | B(src2));
  
  	case SLJIT_OR:
  		if (flags & ALT_FORM1) {
  			SLJIT_ASSERT(src2 == TMP_REG2);
  			return push_inst(compiler, ORI | S(src1) | A(dst) | compiler->imm);
  		}
  		if (flags & ALT_FORM2) {
  			SLJIT_ASSERT(src2 == TMP_REG2);
  			return push_inst(compiler, ORIS | S(src1) | A(dst) | compiler->imm);
  		}
  		if (flags & ALT_FORM3) {
  			SLJIT_ASSERT(src2 == TMP_REG2);
  			FAIL_IF(push_inst(compiler, ORI | S(src1) | A(dst) | IMM(compiler->imm)));
  			return push_inst(compiler, ORIS | S(dst) | A(dst) | IMM(compiler->imm >> 16));
  		}
  		return push_inst(compiler, OR | RC(flags) | S(src1) | A(dst) | B(src2));
  
  	case SLJIT_XOR:
  		if (flags & ALT_FORM1) {
  			SLJIT_ASSERT(src2 == TMP_REG2);
  			return push_inst(compiler, XORI | S(src1) | A(dst) | compiler->imm);
  		}
  		if (flags & ALT_FORM2) {
  			SLJIT_ASSERT(src2 == TMP_REG2);
  			return push_inst(compiler, XORIS | S(src1) | A(dst) | compiler->imm);
  		}
  		if (flags & ALT_FORM3) {
  			SLJIT_ASSERT(src2 == TMP_REG2);
  			FAIL_IF(push_inst(compiler, XORI | S(src1) | A(dst) | IMM(compiler->imm)));
  			return push_inst(compiler, XORIS | S(dst) | A(dst) | IMM(compiler->imm >> 16));
  		}
  		return push_inst(compiler, XOR | RC(flags) | S(src1) | A(dst) | B(src2));
  
  	case SLJIT_SHL:
  		if (flags & ALT_FORM1) {
  			SLJIT_ASSERT(src2 == TMP_REG2);
  			compiler->imm &= 0x1f;
  			return push_inst(compiler, RLWINM | RC(flags) | S(src1) | A(dst) | (compiler->imm << 11) | ((31 - compiler->imm) << 1));
  		}
  		return push_inst(compiler, SLW | RC(flags) | S(src1) | A(dst) | B(src2));
  
  	case SLJIT_LSHR:
  		if (flags & ALT_FORM1) {
  			SLJIT_ASSERT(src2 == TMP_REG2);
  			compiler->imm &= 0x1f;
  			return push_inst(compiler, RLWINM | RC(flags) | S(src1) | A(dst) | (((32 - compiler->imm) & 0x1f) << 11) | (compiler->imm << 6) | (31 << 1));
  		}
  		return push_inst(compiler, SRW | RC(flags) | S(src1) | A(dst) | B(src2));
  
  	case SLJIT_ASHR:
  		if (flags & ALT_FORM1) {
  			SLJIT_ASSERT(src2 == TMP_REG2);
  			compiler->imm &= 0x1f;
  			return push_inst(compiler, SRAWI | RC(flags) | S(src1) | A(dst) | (compiler->imm << 11));
  		}
  		return push_inst(compiler, SRAW | RC(flags) | S(src1) | A(dst) | B(src2));
  	}
  
  	SLJIT_UNREACHABLE();
  	return SLJIT_SUCCESS;
  }
  
  static SLJIT_INLINE sljit_s32 emit_const(struct sljit_compiler *compiler, sljit_s32 reg, sljit_sw init_value)
  {
  	FAIL_IF(push_inst(compiler, ADDIS | D(reg) | A(0) | IMM(init_value >> 16)));
  	return push_inst(compiler, ORI | S(reg) | A(reg) | IMM(init_value));
  }
  
  SLJIT_API_FUNC_ATTRIBUTE void sljit_set_jump_addr(sljit_uw addr, sljit_uw new_target, sljit_sw executable_offset)
  {
  	sljit_ins *inst = (sljit_ins *)addr;
  
  	inst[0] = (inst[0] & 0xffff0000) | ((new_target >> 16) & 0xffff);
  	inst[1] = (inst[1] & 0xffff0000) | (new_target & 0xffff);
  	inst = (sljit_ins *)SLJIT_ADD_EXEC_OFFSET(inst, executable_offset);
  	SLJIT_CACHE_FLUSH(inst, inst + 2);
  }
  
  SLJIT_API_FUNC_ATTRIBUTE void sljit_set_const(sljit_uw addr, sljit_sw new_constant, sljit_sw executable_offset)
  {
  	sljit_ins *inst = (sljit_ins *)addr;
  
  	inst[0] = (inst[0] & 0xffff0000) | ((new_constant >> 16) & 0xffff);
  	inst[1] = (inst[1] & 0xffff0000) | (new_constant & 0xffff);
  	inst = (sljit_ins *)SLJIT_ADD_EXEC_OFFSET(inst, executable_offset);
  	SLJIT_CACHE_FLUSH(inst, inst + 2);
  }
  