Commit 61204ce8 authored by Edgar E. Iglesias's avatar Edgar E. Iglesias Committed by Edgar E. Iglesias
Browse files

microblaze: Improve branch with small immediates 



Slight improvements of conditional branches with small
immediate offsets.

Signed-off-by: default avatarEdgar E. Iglesias <edgar.iglesias@petalogix.com>
parent 04906034

target-microblaze/translate.c

+21 −7
Original line number Diff line number Diff line
@@ -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));

    }



    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)));

    eval_cc(dc, cc, env_btaken, cpu_R[dc->ra], tcg_const_tl(0));

    }

    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);

        }

    }

}