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tcg: Require liveness analysis

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Backports commit c0ef05b5e62ab0c291a94022f14104e61e306f03 from qemu
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Richard Henderson 2018-02-25 22:20:37 -05:00 committed by Lioncash
parent 541601edc4
commit 8a012ff6d3
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1 changed files with 0 additions and 21 deletions
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21
qemu/tcg/tcg.c
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@ -23,7 +23,6 @@
*/
/* define it to use liveness analysis (better code) */
#define USE_LIVENESS_ANALYSIS
#define USE_TCG_OPTIMIZATIONS
#include "qemu/osdep.h"
@ -1383,8 +1382,6 @@ void tcg_op_remove(TCGContext *s, TCGOp *op)
#endif
}
#ifdef USE_LIVENESS_ANALYSIS
#define TS_DEAD 1
#define TS_MEM 2
@ -1668,18 +1665,6 @@ static void tcg_liveness_analysis(TCGContext *s)
op->life = arg_life;
}
}
#else
/* dummy liveness analysis */
static void tcg_liveness_analysis(TCGContext *s)
{
int nb_ops = s->gen_next_op_idx;
s->op_dead_args = tcg_malloc(s, nb_ops * sizeof(uint16_t));
memset(s->op_dead_args, 0, nb_ops * sizeof(uint16_t));
s->op_sync_args = tcg_malloc(s, nb_ops * sizeof(uint8_t));
memset(s->op_sync_args, 0, nb_ops * sizeof(uint8_t));
}
#endif
#ifdef CONFIG_DEBUG_TCG
static void dump_regs(TCGContext *s)
@ -1931,7 +1916,6 @@ static void temp_load(TCGContext *s, TCGTemp *ts, TCGRegSet desired_regs,
temporary registers needs to be allocated to store a constant. */
static void temp_save(TCGContext *s, TCGTemp *ts, TCGRegSet allocated_regs)
{
#ifdef USE_LIVENESS_ANALYSIS
/* ??? Liveness does not yet incorporate indirect bases. */
if (!ts->indirect_base) {
/* The liveness analysis already ensures that globals are back
@ -1939,7 +1923,6 @@ static void temp_save(TCGContext *s, TCGTemp *ts, TCGRegSet allocated_regs)
tcg_debug_assert(ts->val_type == TEMP_VAL_MEM || ts->fixed_reg);
return;
}
#endif
temp_sync(s, ts, allocated_regs, 1);
}
@ -1964,7 +1947,6 @@ static void sync_globals(TCGContext *s, TCGRegSet allocated_regs)
for (i = 0; i < s->nb_globals; i++) {
TCGTemp *ts = &s->temps[i];
#ifdef USE_LIVENESS_ANALYSIS
/* ??? Liveness does not yet incorporate indirect bases. */
if (!ts->indirect_base) {
tcg_debug_assert(ts->val_type != TEMP_VAL_REG
@ -1972,7 +1954,6 @@ static void sync_globals(TCGContext *s, TCGRegSet allocated_regs)
|| ts->mem_coherent);
continue;
}
#endif
temp_sync(s, ts, allocated_regs, 0);
}
}
@ -1988,7 +1969,6 @@ static void tcg_reg_alloc_bb_end(TCGContext *s, TCGRegSet allocated_regs)
if (ts->temp_local) {
temp_save(s, ts, allocated_regs);
} else {
#ifdef USE_LIVENESS_ANALYSIS
/* ??? Liveness does not yet incorporate indirect bases. */
if (!ts->indirect_base) {
/* The liveness analysis already ensures that temps are dead.
@ -1996,7 +1976,6 @@ static void tcg_reg_alloc_bb_end(TCGContext *s, TCGRegSet allocated_regs)
tcg_debug_assert(ts->val_type == TEMP_VAL_DEAD);
continue;
}
#endif
temp_dead(s, ts);
}
}