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microblaze: Improve unconditional direct branching 

Avoid emitting conditional tcg operations for uncoditional
direct branches.

Signed-off-by: Edgar E. Iglesias <edgar.iglesias@petalogix.com>
This commit is contained in:
Edgar E. Iglesias 2011-01-14 12:30:26 +01:00
parent d03d11260e
commit 844bab604b
1 changed files with 14 additions and 7 deletions
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21
target-microblaze/translate.c
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@ -78,9 +78,10 @@ typedef struct DisasContext {
unsigned int clear_imm;
int is_jmp;
#define JMP_NOJMP 0
#define JMP_DIRECT 1
#define JMP_INDIRECT 2
#define JMP_NOJMP 0
#define JMP_DIRECT 1
#define JMP_DIRECT_CC 2
#define JMP_INDIRECT 3
unsigned int jmp;
uint32_t jmp_pc;
@ -751,7 +752,10 @@ static void dec_bit(DisasContext *dc)
static inline void sync_jmpstate(DisasContext *dc)
{
if (dc->jmp == JMP_DIRECT) {
if (dc->jmp == JMP_DIRECT || dc->jmp == JMP_DIRECT_CC) {
if (dc->jmp == JMP_DIRECT) {
tcg_gen_movi_tl(env_btaken, 1);
}
dc->jmp = JMP_INDIRECT;
tcg_gen_movi_tl(env_btarget, dc->jmp_pc);
}
@ -975,7 +979,7 @@ static void dec_bcc(DisasContext *dc)
int32_t offset = (int32_t)((int16_t)dc->imm); /* sign-extend. */
tcg_gen_movi_tl(env_btarget, dc->pc + offset);
dc->jmp = JMP_DIRECT;
dc->jmp = JMP_DIRECT_CC;
dc->jmp_pc = dc->pc + offset;
} else {
dc->jmp = JMP_INDIRECT;
@ -1029,7 +1033,6 @@ static void dec_br(DisasContext *dc)
if (dec_alu_op_b_is_small_imm(dc)) {
dc->jmp = JMP_DIRECT;
dc->jmp_pc = dc->pc + (int32_t)((int16_t)dc->imm);
tcg_gen_movi_tl(env_btaken, 1);
} else {
tcg_gen_movi_tl(env_btaken, 1);
tcg_gen_movi_tl(env_btarget, dc->pc);
@ -1451,6 +1454,10 @@ gen_intermediate_code_internal(CPUState *env, TranslationBlock *tb,
eval_cond_jmp(dc, env_btarget, tcg_const_tl(dc->pc));
dc->is_jmp = DISAS_JUMP;
} else if (dc->jmp == JMP_DIRECT) {
t_sync_flags(dc);
gen_goto_tb(dc, 0, dc->jmp_pc);
dc->is_jmp = DISAS_TB_JUMP;
} else if (dc->jmp == JMP_DIRECT_CC) {
int l1;
t_sync_flags(dc);
@ -1475,7 +1482,7 @@ gen_intermediate_code_internal(CPUState *env, TranslationBlock *tb,
&& num_insns < max_insns);
npc = dc->pc;
if (dc->jmp == JMP_DIRECT) {
if (dc->jmp == JMP_DIRECT || dc->jmp == JMP_DIRECT_CC) {
if (dc->tb_flags & D_FLAG) {
dc->is_jmp = DISAS_UPDATE;
tcg_gen_movi_tl(cpu_SR[SR_PC], npc);