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microblaze: Improve branch with small immediates 

Slight improvements of conditional branches with small
immediate offsets.

Signed-off-by: Edgar E. Iglesias <edgar.iglesias@petalogix.com>
master
Edgar E. Iglesias 2010-07-24 21:24:59 +02:00 committed by Edgar E. Iglesias
parent 04906034f5
commit 61204ce8ec
1 changed files with 21 additions and 7 deletions
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28
target-microblaze/translate.c
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@ -153,6 +153,14 @@ static void gen_goto_tb(DisasContext *dc, int n, target_ulong dest)
}
}
/* True if ALU operand b is a small immediate that may deserve
faster treatment. */
static inline int dec_alu_op_b_is_small_imm(DisasContext *dc)
{
/* Immediate insn without the imm prefix ? */
return dc->type_b && !(dc->tb_flags & IMM_FLAG);
}
static inline TCGv *dec_alu_op_b(DisasContext *dc)
{
if (dc->type_b) {
@ -984,10 +992,16 @@ static void dec_bcc(DisasContext *dc)
cpu_env, offsetof(CPUState, bimm));
}
tcg_gen_movi_tl(env_btarget, dc->pc);
tcg_gen_add_tl(env_btarget, env_btarget, *(dec_alu_op_b(dc)));
eval_cc(dc, cc, env_btaken, cpu_R[dc->ra], tcg_const_tl(0));
if (dec_alu_op_b_is_small_imm(dc)) {
int32_t offset = (int32_t)((int16_t)dc->imm); /* sign-extend. */
tcg_gen_movi_tl(env_btarget, dc->pc + offset);
} else {
tcg_gen_movi_tl(env_btarget, dc->pc);
tcg_gen_add_tl(env_btarget, env_btarget, *(dec_alu_op_b(dc)));
}
dc->jmp = JMP_INDIRECT;
eval_cc(dc, cc, env_btaken, cpu_R[dc->ra], tcg_const_tl(0));
}
static void dec_br(DisasContext *dc)
@ -1031,13 +1045,13 @@ static void dec_br(DisasContext *dc)
}
}
} else {
if (!dc->type_b || (dc->tb_flags & IMM_FLAG)) {
if (dec_alu_op_b_is_small_imm(dc)) {
dc->jmp = JMP_DIRECT;
dc->jmp_pc = dc->pc + (int32_t)((int16_t)dc->imm);
} else {
tcg_gen_movi_tl(env_btaken, 1);
tcg_gen_movi_tl(env_btarget, dc->pc);
tcg_gen_add_tl(env_btarget, env_btarget, *(dec_alu_op_b(dc)));
} else {
dc->jmp = JMP_DIRECT;
dc->jmp_pc = dc->pc + (int32_t)((int16_t)dc->imm);
}
}
}