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tcg: Use tcg_target_available_regs in tcg_reg_alloc_mov 

The move opcodes are special in that their constraints must cover
all available registers.  So instead of checking the constraints,
just use the available registers.

Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2014-04-29 09:07:05 -07:00
parent cf06667428
commit af3cbfbe80
1 changed files with 10 additions and 9 deletions
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19
tcg/tcg.c
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@ -2096,13 +2096,12 @@ static void tcg_reg_alloc_mov(TCGContext *s, const TCGOpDef *def,
{
TCGRegSet allocated_regs;
TCGTemp *ts, *ots;
const TCGArgConstraint *arg_ct, *oarg_ct;
TCGType type;
tcg_regset_set(allocated_regs, s->reserved_regs);
ots = &s->temps[args[0]];
ts = &s->temps[args[1]];
oarg_ct = &def->args_ct[0];
arg_ct = &def->args_ct[1];
type = ots->type;
/* If the source value is not in a register, and we're going to be
forced to have it in a register in order to perform the copy,
@ -2110,12 +2109,13 @@ 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, arg_ct->u.regs, allocated_regs);
ts->reg = tcg_reg_alloc(s, tcg_target_available_regs[type],
allocated_regs);
if (ts->val_type == TEMP_VAL_MEM) {
tcg_out_ld(s, ts->type, ts->reg, ts->mem_reg, ts->mem_offset);
tcg_out_ld(s, type, ts->reg, ts->mem_reg, ts->mem_offset);
ts->mem_coherent = 1;
} else if (ts->val_type == TEMP_VAL_CONST) {
tcg_out_movi(s, ts->type, ts->reg, ts->val);
tcg_out_movi(s, type, ts->reg, ts->val);
}
s->reg_to_temp[ts->reg] = args[1];
ts->val_type = TEMP_VAL_REG;
@ -2130,7 +2130,7 @@ static void tcg_reg_alloc_mov(TCGContext *s, const TCGOpDef *def,
if (!ots->mem_allocated) {
temp_allocate_frame(s, args[0]);
}
tcg_out_st(s, ots->type, ts->reg, ots->mem_reg, ots->mem_offset);
tcg_out_st(s, type, ts->reg, ots->mem_reg, ots->mem_offset);
if (IS_DEAD_ARG(1)) {
temp_dead(s, args[1]);
}
@ -2158,9 +2158,10 @@ static void tcg_reg_alloc_mov(TCGContext *s, const TCGOpDef *def,
/* When allocating a new register, make sure to not spill the
input one. */
tcg_regset_set_reg(allocated_regs, ts->reg);
ots->reg = tcg_reg_alloc(s, oarg_ct->u.regs, allocated_regs);
ots->reg = tcg_reg_alloc(s, tcg_target_available_regs[type],
allocated_regs);
}
tcg_out_mov(s, ots->type, ots->reg, ts->reg);
tcg_out_mov(s, type, ots->reg, ts->reg);
}
ots->val_type = TEMP_VAL_REG;
ots->mem_coherent = 0;