MWCC/compiler_and_linker/unsorted/PCodeUtilities.c

#include "compiler/PCodeUtilities.h"
#include "compiler/CError.h"
#include "compiler/CFunc.h"
#include "compiler/CParser.h"
#include "compiler/CodeGen.h"
#include "compiler/Exceptions.h"
#include "compiler/PCode.h"
#include "compiler/PCodeInfo.h"
#include "compiler/Registers.h"
#include "compiler/enode.h"
#include "compiler/objects.h"

void pcsetrecordbit(PCode *pc) {
    int reg;
    PCodeArg *arg;
    short argCount;
    int argIdx;

    pc->flags &= ~(fIsMove | fCommutative | fIsCSE);
    if ((pc->flags & fOpTypeMask) == fOpTypeFPR) {
        reg = 1;
    } else if ((pc->flags & fOpTypeMask) == fOpTypeVR) {
        reg = 6;
    } else {
        reg = 0;
    }

    if (pc->op == PC_ANDI || pc->op == PC_ANDIS) {
        pc->flags |= fRecordBit;
    } else if (pc->op == PC_ADDI || pc->op == PC_ADDIC) {
        pc->flags |= fSetsCarry;
        pc->flags |= fRecordBit;
        change_num_operands(pc, 5);
        pc->op = PC_ADDICR;

        CError_ASSERT(76, pc->args[3].kind == PCOp_PLACEHOLDEROPERAND);
        pc->args[3].kind = PCOp_REGISTER;
        pc->args[3].arg = RegClass_SPR;
        pc->args[3].data.reg.reg = 0;
        pc->args[3].data.reg.effect = EffectWrite;
        CError_ASSERT(80, pc->args[4].kind == PCOp_PLACEHOLDEROPERAND);
        pc->args[4].kind = PCOp_REGISTER;
        pc->args[4].arg = RegClass_CRFIELD;
        pc->args[4].data.reg.reg = reg;
        pc->args[4].data.reg.effect = EffectWrite;
    } else {
        arg = pc->args;
        argIdx = argCount = pc->argCount;
        while (arg->kind != PCOp_PLACEHOLDEROPERAND && argIdx) {
            if (arg->kind == PCOp_REGISTER && arg->arg == RegClass_CRFIELD && arg->data.reg.reg == reg) {
                arg->data.reg.effect |= EffectWrite;
                pc->flags |= fRecordBit;
                return;
            }
            arg++;
            argIdx--;
        }

        if (argIdx <= 0) {
            arg = &pc->args[argCount];
            pc->argCount++;
        }

        CError_ASSERT(105, arg->kind == PCOp_PLACEHOLDEROPERAND);
        arg->kind = PCOp_REGISTER;
        arg->arg = RegClass_CRFIELD;
        arg->data.reg.reg = reg;
        arg->data.reg.effect = EffectWrite;
        if (pc->op != PC_ADDICR)
            pc->flags |= fRecordBit;
    }
}

void pcsetsideeffects(PCode *pc) {
    pc->flags &= ~(fIsMove | fCommutative | fIsCSE);
    pc->flags |= fSideEffects;
}

void pcsetlinkbit(PCode *pc) {
    PCodeArg *arg;
    int argIdx;

    switch (pc->op) {
        case PC_B:
            pc->op = PC_BL;
            break;
        case PC_BCTR:
            pc->op = PC_BCTRL;
            break;
        case PC_BLR:
            pc->op = PC_BLRL;
            break;
    }

    arg = pc->args;
    argIdx = pc->argCount;
    while (arg->kind != PCOp_PLACEHOLDEROPERAND && argIdx) {
        if (arg->kind == PCOp_REGISTER && arg->arg == RegClass_SPR && arg->data.reg.reg == 1) {
            arg->data.reg.effect |= EffectWrite;
            pc->flags |= fLink;
            return;
        }
        arg++;
        argIdx--;
    }

    CError_ASSERT(169, arg->kind == PCOp_PLACEHOLDEROPERAND);
    arg->kind = PCOp_REGISTER;
    arg->arg = RegClass_SPR;
    arg->data.reg.reg = 1;
    arg->data.reg.effect = EffectWrite;

    if (opcodeinfo[pc->op].flags & fIsCall) {
        pc->flags &= ~fIsBranch;
        pc->flags |= fIsCall;
    }
    pc->flags |= fLink;
}

void branch_label(PCodeLabel *label) {
    if (pclastblock->pcodeCount) {
        pcbranch(pclastblock, label);
        makepcblock();
    }
    pclabel(pclastblock, label);
}

void branch_conditional(short a, short compareop, short c, PCodeLabel *label) {
    PCodeBlock *tmpblock;
    PCodeLabel *tmplabel;
    int r28;

    tmpblock = pclastblock;
    tmplabel = makepclabel();

    switch (compareop) {
        case ENOTEQU:
            c = !c;
        case EEQU:
            r28 = 2;
            break;
        case EGREATEREQU:
            c = !c;
        case ELESS:
            r28 = 0;
            break;
        case ELESSEQU:
            c = !c;
        case EGREATER:
            r28 = 1;
            break;
    }

    emitpcode(c ? PC_BT : PC_BF, a, r28, label);
    pcbranch(pclastblock, label);
    pcbranch(pclastblock, tmplabel);
    makepcblock();
    pclabel(pclastblock, tmplabel);
}

void branch_always(PCodeLabel *label) {
    emitpcode(PC_B, label);
    pcbranch(pclastblock, label);
    makepcblock();
}

void branch_decrement_always(Opcode opcode, PCodeLabel *label) {
    PCodeLabel *tmplabel = makepclabel();
    emitpcode(opcode, label);
    pcbranch(pclastblock, label);
    pcbranch(pclastblock, tmplabel);
    makepcblock();
    pclabel(pclastblock, tmplabel);
}

void branch_indirect(Object *obj) {
    emitpcode(PC_BCTR, obj, 0);
    makepcblock();
}

int branch_count_volatiles(void) {
    int count = 0;
    int i;
    RegClass rclass;

    for (rclass = 0; rclass < RegClassMax; rclass++) {
        for (i = 0; i < n_scratch_registers[rclass]; i++) {
            count++;
        }
    }

    return count;
}

PCodeArg *branch_record_volatiles(PCodeArg *arglist, UInt32 *masks) {
    int i;
    RegClass rclass;

    for (rclass = RegClassMax - 1; rclass >= 0; rclass--) {
        for (i = 0; i < n_scratch_registers[rclass]; i++) {
            arglist->kind = PCOp_REGISTER;
            arglist->arg = rclass;
            arglist->data.reg.reg = scratch_registers[rclass][i];
            arglist->data.reg.effect = EffectWrite;
            if (masks[rclass] & (1 << scratch_registers[rclass][i]))
                arglist->data.reg.effect |= EffectRead;
            arglist++;
        }
    }

    return arglist;
}

void branch_subroutine(Object *obj, short add_nop, UInt32 *masks) {
    int count;
    PCode *pc;
    PCodeArg *arg;

    count = branch_count_volatiles();
    if (copts.exceptions && current_statement)
        count += countexceptionactionregisters(current_statement->dobjstack);

    pc = makepcode(PC_BL, count, obj, 0);
    arg = branch_record_volatiles(pc->args + 1, masks);
    if (copts.exceptions && current_statement)
        noteexceptionactionregisters(current_statement->dobjstack, arg);
    appendpcode(pclastblock, pc);

    if (add_nop)
        emitpcode(PC_NOP);

    branch_label(makepclabel());
    if (copts.exceptions && current_statement)
        recordexceptionactions(pc, current_statement->dobjstack);
}

void branch_subroutine_ctr(UInt32 *masks) {
    int count;
    PCode *pc;
    PCodeArg *arg;

    count = branch_count_volatiles();
    if (copts.exceptions && current_statement)
        count += countexceptionactionregisters(current_statement->dobjstack);

    pc = makepcode(PC_BCTRL, count);
    arg = branch_record_volatiles(pc->args + 1, masks);
    if (copts.exceptions && current_statement)
        noteexceptionactionregisters(current_statement->dobjstack, arg);
    appendpcode(pclastblock, pc);

    branch_label(makepclabel());
    if (copts.exceptions && current_statement)
        recordexceptionactions(pc, current_statement->dobjstack);
}

void add_immediate(short dest_reg, short base_reg, Object *obj, SInt16 offset) {
    short tmp_reg = base_reg;

    if (obj && offset && obj->datatype != DLOCAL) {
        tmp_reg = used_virtual_registers[RegClass_GPR]++;
        add_immediate_lo(tmp_reg, base_reg, obj, 0, 1);
        obj = NULL;
    }

    if (!obj && !offset)
        emitpcode(PC_MR, dest_reg, tmp_reg);
    else
        emitpcode(PC_ADDI, dest_reg, tmp_reg, obj, offset);
}

PCode *add_immediate_lo(short dest_reg, short base_reg, Object *obj, SInt16 offset, char add_to_block) {
    PCode *pc;

    CError_ASSERT(577, obj);

    pc = makepcode(PC_ADDI, dest_reg, base_reg, obj, offset);
    if (add_to_block)
        appendpcode(pclastblock, pc);
    return pc;
}

PCode *op_absolute_ha(short dest_reg, short base_reg, Object *obj, short offset, char add_to_block) {
    PCode *pc;
    int tmp_reg;

    if (obj->datatype == DLOCAL) {
        pc = makepcode(PC_ADDIS, dest_reg, base_reg, obj, offset);
    } else if (copts.codegen_pic) {
        tmp_reg = base_reg;
        CError_ASSERT(601, tmp_reg);
        pc = makepcode(PC_ADDIS, dest_reg, tmp_reg, obj, offset);
    } else {
        CError_ASSERT(606, base_reg == 0);
        pc = makepcode(PC_LIS, dest_reg, obj, offset);
    }

    if (add_to_block)
        appendpcode(pclastblock, pc);
    return pc;
}

void load_store_register(Opcode opcode, short dest_reg, short base_reg, Object *obj, SInt32 offset) {
    short addi_tmp;
    short offset_reg1;
    short offset_reg2;

    offset_reg1 = base_reg;
    if (obj && offset && obj->datatype != DLOCAL) {
        offset_reg1 = used_virtual_registers[RegClass_GPR]++;
        add_immediate_lo(offset_reg1, base_reg, obj, 0, 1);
        obj = NULL;
    }

    if (offset != (short)offset) {
        if (opcode == PC_LWZ && dest_reg == 12)
            offset_reg2 = 12;
        else if (opcode == PC_LWZ && dest_reg == 11)
            offset_reg2 = 11;
        else
            offset_reg2 = used_virtual_registers[RegClass_GPR]++;

        emitpcode(PC_ADDIS, offset_reg2, offset_reg1, 0, (short) ((offset >> 16) + ((offset & 0x8000) >> 15)));
        offset = (short) offset;
        offset_reg1 = offset_reg2;
    }

    if (opcode == PC_STVX || opcode == PC_LVX) {
        offset_reg2 = 0;
        if (obj) {
            addi_tmp = used_virtual_registers[RegClass_GPR]++;
            emitpcode(PC_ADDI, addi_tmp, offset_reg1, obj, offset);
            offset_reg1 = addi_tmp;
        } else if (offset) {
            offset_reg2 = used_virtual_registers[RegClass_GPR]++;
            emitpcode(PC_LI, offset_reg2, offset);
        }
        if (!offset_reg2)
            emitpcode(opcode, dest_reg, 0, offset_reg1);
        else
            emitpcode(opcode, dest_reg, offset_reg1, offset_reg2);
    } else {
        emitpcode(opcode, dest_reg, offset_reg1, obj, offset);
    }
}