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target/openrisc: Form the spr index from tcg

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Rather than pass base+offset to the helper, pass the full index.
In most cases the base is r0 and optimization yields a constant.

Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Stafford Horne <shorne@gmail.com>
This commit is contained in:
Richard Henderson 2018-05-23 07:13:26 -07:00 • committed by Stafford Horne
parent 01ec3ec930
commit c28fa81f91
3 changed files with 14 additions and 15 deletions
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16
target/openrisc/translate.c
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@ -865,9 +865,10 @@ static bool trans_l_mfspr(DisasContext *dc, arg_l_mfspr *a, uint32_t insn)
if (is_user(dc)) {
gen_illegal_exception(dc);
} else {
TCGv_i32 ti = tcg_const_i32(a->k);
gen_helper_mfspr(cpu_R[a->d], cpu_env, cpu_R[a->d], cpu_R[a->a], ti);
tcg_temp_free_i32(ti);
TCGv spr = tcg_temp_new();
tcg_gen_ori_tl(spr, cpu_R[a->a], a->k);
gen_helper_mfspr(cpu_R[a->d], cpu_env, cpu_R[a->d], spr);
tcg_temp_free(spr);
}
return true;
}
@ -877,7 +878,7 @@ static bool trans_l_mtspr(DisasContext *dc, arg_l_mtspr *a, uint32_t insn)
if (is_user(dc)) {
gen_illegal_exception(dc);
} else {
TCGv_i32 ti;
TCGv spr;
/* For SR, we will need to exit the TB to recognize the new
* exception state. For NPC, in theory this counts as a branch
@ -892,9 +893,10 @@ static bool trans_l_mtspr(DisasContext *dc, arg_l_mtspr *a, uint32_t insn)
}
dc->base.is_jmp = DISAS_EXIT;
ti = tcg_const_i32(a->k);
gen_helper_mtspr(cpu_env, cpu_R[a->a], cpu_R[a->b], ti);
tcg_temp_free_i32(ti);
spr = tcg_temp_new();
tcg_gen_ori_tl(spr, cpu_R[a->a], a->k);
gen_helper_mtspr(cpu_env, spr, cpu_R[a->b]);
tcg_temp_free(spr);
}
return true;
}