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tcg: add temp_sync()

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Add a new function temp_sync() to synchronize the canonical location
of a temp with the value in the corresponding register, but without
freeing the associated register. Rewrite temp_save() to call
temp_sync() followed by temp_dead().

Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Aurelien Jarno 2012-10-09 21:53:06 +02:00
parent 7f6ceedf9c
commit 1ad80729be
1 changed files with 19 additions and 15 deletions
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34
tcg/tcg.c
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@ -1593,31 +1593,27 @@ static inline void temp_dead(TCGContext *s, int temp)
} }
} }
/* save a temporary to memory. 'allocated_regs' is used in case a /* sync a temporary to memory. 'allocated_regs' is used in case a
temporary registers needs to be allocated to store a constant. */ temporary registers needs to be allocated to store a constant. */
static void temp_save(TCGContext *s, int temp, TCGRegSet allocated_regs) static inline void temp_sync(TCGContext *s, int temp, TCGRegSet allocated_regs)
{ {
TCGTemp *ts; TCGTemp *ts;
int reg;
ts = &s->temps[temp]; ts = &s->temps[temp];
if (!ts->fixed_reg) { if (!ts->fixed_reg) {
switch(ts->val_type) { switch(ts->val_type) {
case TEMP_VAL_CONST:
ts->reg = tcg_reg_alloc(s, tcg_target_available_regs[ts->type],
allocated_regs);
ts->val_type = TEMP_VAL_REG;
s->reg_to_temp[ts->reg] = temp;
ts->mem_coherent = 0;
tcg_out_movi(s, ts->type, ts->reg, ts->val);
/* fallthrough*/
case TEMP_VAL_REG: case TEMP_VAL_REG:
tcg_reg_free(s, ts->reg); tcg_reg_sync(s, ts->reg);
break; break;
case TEMP_VAL_DEAD: case TEMP_VAL_DEAD:
ts->val_type = TEMP_VAL_MEM;
break;
case TEMP_VAL_CONST:
reg = tcg_reg_alloc(s, tcg_target_available_regs[ts->type],
allocated_regs);
if (!ts->mem_allocated)
temp_allocate_frame(s, temp);
tcg_out_movi(s, ts->type, reg, ts->val);
tcg_out_st(s, ts->type, reg, ts->mem_reg, ts->mem_offset);
ts->val_type = TEMP_VAL_MEM;
break;
case TEMP_VAL_MEM: case TEMP_VAL_MEM:
break; break;
default: default:
@ -1626,6 +1622,14 @@ static void temp_save(TCGContext *s, int temp, TCGRegSet allocated_regs)
} }
} }
/* save a temporary to memory. 'allocated_regs' is used in case a
temporary registers needs to be allocated to store a constant. */
static inline void temp_save(TCGContext *s, int temp, TCGRegSet allocated_regs)
{
temp_sync(s, temp, allocated_regs);
temp_dead(s, temp);
}
/* save globals to their canonical location and assume they can be /* save globals to their canonical location and assume they can be
modified be the following code. 'allocated_regs' is used in case a modified be the following code. 'allocated_regs' is used in case a
temporary registers needs to be allocated to store a constant. */ temporary registers needs to be allocated to store a constant. */