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tcg: Introduce temp_load

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Unify all of the places that realize a temporary into a register.

Backports commit 40ae5c62ebaaf7d9d3b93b88c2d32bf6342f7889 from qemu
This commit is contained in:
Richard Henderson 2018-02-19 11:43:59 -05:00 committed by Lioncash
parent c821ffd989
commit 292c67109a
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 52 additions and 63 deletions
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115
qemu/tcg/tcg.c
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@ -1775,6 +1775,35 @@ static TCGReg tcg_reg_alloc(TCGContext *s, TCGRegSet reg1, TCGRegSet reg2)
tcg_abort();
}
/* Make sure the temporary is in a register. If needed, allocate the register
from DESIRED while avoiding ALLOCATED. */
static void temp_load(TCGContext *s, TCGTemp *ts, TCGRegSet desired_regs,
TCGRegSet allocated_regs)
{
TCGReg reg;
switch (ts->val_type) {
case TEMP_VAL_REG:
return;
case TEMP_VAL_CONST:
reg = tcg_reg_alloc(s, desired_regs, allocated_regs);
tcg_out_movi(s, ts->type, reg, ts->val);
ts->mem_coherent = 0;
break;
case TEMP_VAL_MEM:
reg = tcg_reg_alloc(s, desired_regs, allocated_regs);
tcg_out_ld(s, ts->type, reg, ts->mem_base->reg, ts->mem_offset);
ts->mem_coherent = 1;
break;
case TEMP_VAL_DEAD:
default:
tcg_abort();
}
ts->reg = reg;
ts->val_type = TEMP_VAL_REG;
s->reg_to_temp[reg] = ts;
}
/* mark a temporary as dead. */
static inline void temp_dead(TCGContext *s, TCGTemp *ts)
{
@ -1798,13 +1827,8 @@ static void temp_sync(TCGContext *s, TCGTemp *ts, TCGRegSet allocated_regs)
}
switch (ts->val_type) {
case TEMP_VAL_CONST:
ts->reg = tcg_reg_alloc(s, s->tcg_target_available_regs[ts->type],
allocated_regs);
ts->val_type = TEMP_VAL_REG;
s->reg_to_temp[ts->reg] = ts;
ts->mem_coherent = 0;
tcg_out_movi(s, ts->type, ts->reg, ts->val);
/* fallthrough*/
temp_load(s, ts, s->tcg_target_available_regs[ts->type], allocated_regs);
/* fallthrough */
case TEMP_VAL_REG:
tcg_reg_sync(s, ts->reg);
break;
@ -1940,17 +1964,7 @@ static void tcg_reg_alloc_mov(TCGContext *s, const TCGOpDef *def,
we don't have to reload SOURCE the next time it is used. */
if (((NEED_SYNC_ARG(0) || ots->fixed_reg) && ts->val_type != TEMP_VAL_REG)
|| ts->val_type == TEMP_VAL_MEM) {
ts->reg = tcg_reg_alloc(s, (TCGRegSet)s->tcg_target_available_regs[itype],
allocated_regs);
if (ts->val_type == TEMP_VAL_MEM) {
tcg_out_ld(s, itype, ts->reg, ts->mem_base->reg, ts->mem_offset);
ts->mem_coherent = 1;
} else if (ts->val_type == TEMP_VAL_CONST) {
tcg_out_movi(s, itype, ts->reg, ts->val);
ts->mem_coherent = 0;
}
s->reg_to_temp[ts->reg] = ts;
ts->val_type = TEMP_VAL_REG;
temp_load(s, ts, s->tcg_target_available_regs[itype], allocated_regs);
}
if (IS_DEAD_ARG(0) && !ots->fixed_reg) {
@ -2033,29 +2047,17 @@ static void tcg_reg_alloc_op(TCGContext *s,
arg = args[i];
arg_ct = &def->args_ct[i];
ts = &s->temps[arg];
if (ts->val_type == TEMP_VAL_MEM) {
reg = tcg_reg_alloc(s, arg_ct->u.regs, allocated_regs);
tcg_out_ld(s, ts->type, reg, ts->mem_base->reg, ts->mem_offset);
ts->val_type = TEMP_VAL_REG;
ts->reg = reg;
ts->mem_coherent = 1;
s->reg_to_temp[reg] = ts;
} else if (ts->val_type == TEMP_VAL_CONST) {
if (tcg_target_const_match(ts->val, ts->type, arg_ct)) {
/* constant is OK for instruction */
const_args[i] = 1;
new_args[i] = ts->val;
goto iarg_end;
} else {
/* need to move to a register */
reg = tcg_reg_alloc(s, arg_ct->u.regs, allocated_regs);
tcg_out_movi(s, ts->type, reg, ts->val);
ts->val_type = TEMP_VAL_REG;
ts->reg = reg;
ts->mem_coherent = 0;
s->reg_to_temp[reg] = ts;
}
if (ts->val_type == TEMP_VAL_CONST
&& tcg_target_const_match(ts->val, ts->type, arg_ct)) {
/* constant is OK for instruction */
const_args[i] = 1;
new_args[i] = ts->val;
goto iarg_end;
}
temp_load(s, ts, arg_ct->u.regs, allocated_regs);
assert(ts->val_type == TEMP_VAL_REG);
if (arg_ct->ct & TCG_CT_IALIAS) {
if (ts->fixed_reg) {
@ -2218,23 +2220,9 @@ static void tcg_reg_alloc_call(TCGContext *s, int nb_oargs, int nb_iargs,
#endif
if (arg != TCG_CALL_DUMMY_ARG) {
ts = &s->temps[arg];
if (ts->val_type == TEMP_VAL_REG) {
tcg_out_st(s, ts->type, ts->reg, TCG_REG_CALL_STACK, stack_offset);
} else if (ts->val_type == TEMP_VAL_MEM) {
reg = tcg_reg_alloc(s, (TCGRegSet)s->tcg_target_available_regs[ts->type],
s->reserved_regs);
/* XXX: not correct if reading values from the stack */
tcg_out_ld(s, ts->type, reg, ts->mem_base->reg, ts->mem_offset);
tcg_out_st(s, ts->type, reg, TCG_REG_CALL_STACK, stack_offset);
} else if (ts->val_type == TEMP_VAL_CONST) {
reg = tcg_reg_alloc(s, (TCGRegSet)s->tcg_target_available_regs[ts->type],
s->reserved_regs);
/* XXX: sign extend may be needed on some targets */
tcg_out_movi(s, ts->type, reg, ts->val);
tcg_out_st(s, ts->type, reg, TCG_REG_CALL_STACK, stack_offset);
} else {
tcg_abort();
}
temp_load(s, ts, s->tcg_target_available_regs[ts->type],
s->reserved_regs);
tcg_out_st(s, ts->type, ts->reg, TCG_REG_CALL_STACK, stack_offset);
}
#ifndef TCG_TARGET_STACK_GROWSUP
stack_offset += sizeof(tcg_target_long);
@ -2249,18 +2237,19 @@ static void tcg_reg_alloc_call(TCGContext *s, int nb_oargs, int nb_iargs,
ts = &s->temps[arg];
reg = tcg_target_call_iarg_regs[i];
tcg_reg_free(s, reg);
if (ts->val_type == TEMP_VAL_REG) {
if (ts->reg != reg) {
tcg_out_mov(s, ts->type, reg, ts->reg);
}
} else if (ts->val_type == TEMP_VAL_MEM) {
tcg_out_ld(s, ts->type, reg, ts->mem_base->reg, ts->mem_offset);
} else if (ts->val_type == TEMP_VAL_CONST) {
/* XXX: sign extend ? */
tcg_out_movi(s, ts->type, reg, ts->val);
} else {
tcg_abort();
TCGRegSet arg_set;
tcg_regset_clear(arg_set);
tcg_regset_set_reg(arg_set, reg);
temp_load(s, ts, arg_set, allocated_regs);
}
tcg_regset_set_reg(allocated_regs, reg);
}
}