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tcg: don't explicitly save globals and temps 

The liveness analysis ensures that globals and temps are at the correct
state at a basic block end or with an op with side effects. Avoid
looping on all temps, this can be time consuming on targets with a lot
of globals. Keep an assert in debug mode.

Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
master
Aurelien Jarno 2012-10-09 21:53:07 +02:00
parent 7dfd8c6aa1
commit 2c0366f036
1 changed files with 12 additions and 0 deletions
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12
tcg/tcg.c
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@ -1648,8 +1648,14 @@ static inline void temp_sync(TCGContext *s, int temp, TCGRegSet allocated_regs)
temporary registers needs to be allocated to store a constant. */
static inline void temp_save(TCGContext *s, int temp, TCGRegSet allocated_regs)
{
#ifdef USE_LIVENESS_ANALYSIS
/* The liveness analysis already ensures that globals are back
in memory. Keep an assert for safety. */
assert(s->temps[temp].val_type == TEMP_VAL_MEM || s->temps[temp].fixed_reg);
#else
temp_sync(s, temp, allocated_regs);
temp_dead(s, temp);
#endif
}
/* save globals to their canonical location and assume they can be
@ -1676,7 +1682,13 @@ static void tcg_reg_alloc_bb_end(TCGContext *s, TCGRegSet allocated_regs)
if (ts->temp_local) {
temp_save(s, i, allocated_regs);
} else {
#ifdef USE_LIVENESS_ANALYSIS
/* The liveness analysis already ensures that temps are dead.
Keep an assert for safety. */
assert(ts->val_type == TEMP_VAL_DEAD);
#else
temp_dead(s, i);
#endif
}
}