From 2c0366f036cbb7b2565ba8185a9daee98d709edb Mon Sep 17 00:00:00 2001 From: Aurelien Jarno Date: Tue, 9 Oct 2012 21:53:07 +0200 Subject: [PATCH] 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 Signed-off-by: Aurelien Jarno --- tcg/tcg.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/tcg/tcg.c b/tcg/tcg.c index 83336673aa..840e2525ec 100644 --- a/tcg/tcg.c +++ b/tcg/tcg.c @@ -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 } }