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target-s390: Optimize ADDU/SUBU CC testing

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We can easily generate some masks for logical add/subtract inline.

Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2012-09-20 09:41:33 -07:00
parent de379661d5
commit a359b770c6
1 changed files with 68 additions and 0 deletions
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68
target-s390x/translate.c
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@ -692,6 +692,49 @@ static void disas_jcc(DisasContext *s, DisasCompare *c, uint32_t mask)
account_inline_branch(s, old_cc_op);
break;
case CC_OP_ADDU_32:
case CC_OP_ADDU_64:
switch (mask) {
case 8 | 2: /* vr == 0 */
cond = TCG_COND_EQ;
break;
case 4 | 1: /* vr != 0 */
cond = TCG_COND_NE;
break;
case 8 | 4: /* no carry -> vr >= src */
cond = TCG_COND_GEU;
break;
case 2 | 1: /* carry -> vr < src */
cond = TCG_COND_LTU;
break;
default:
goto do_dynamic;
}
account_inline_branch(s, old_cc_op);
break;
case CC_OP_SUBU_32:
case CC_OP_SUBU_64:
/* Note that CC=0 is impossible; treat it as dont-care. */
switch (mask & 7) {
case 2: /* zero -> op1 == op2 */
cond = TCG_COND_EQ;
break;
case 4 | 1: /* !zero -> op1 != op2 */
cond = TCG_COND_NE;
break;
case 4: /* borrow (!carry) -> op1 < op2 */
cond = TCG_COND_LTU;
break;
case 2 | 1: /* !borrow (carry) -> op1 >= op2 */
cond = TCG_COND_GEU;
break;
default:
goto do_dynamic;
}
account_inline_branch(s, old_cc_op);
break;
default:
do_dynamic:
/* Calculate cc value. */
@ -719,6 +762,7 @@ static void disas_jcc(DisasContext *s, DisasCompare *c, uint32_t mask)
break;
case CC_OP_LTGT_32:
case CC_OP_LTUGTU_32:
case CC_OP_SUBU_32:
c->is_64 = false;
c->u.s32.a = tcg_temp_new_i32();
tcg_gen_trunc_i64_i32(c->u.s32.a, cc_src);
@ -735,6 +779,7 @@ static void disas_jcc(DisasContext *s, DisasCompare *c, uint32_t mask)
break;
case CC_OP_LTGT_64:
case CC_OP_LTUGTU_64:
case CC_OP_SUBU_64:
c->u.s64.a = cc_src;
c->u.s64.b = cc_dst;
c->g1 = c->g2 = true;
@ -748,6 +793,29 @@ static void disas_jcc(DisasContext *s, DisasCompare *c, uint32_t mask)
tcg_gen_and_i64(c->u.s64.a, cc_src, cc_dst);
break;
case CC_OP_ADDU_32:
c->is_64 = false;
c->u.s32.a = tcg_temp_new_i32();
c->u.s32.b = tcg_temp_new_i32();
tcg_gen_trunc_i64_i32(c->u.s32.a, cc_vr);
if (cond == TCG_COND_EQ || cond == TCG_COND_NE) {
tcg_gen_movi_i32(c->u.s32.b, 0);
} else {
tcg_gen_trunc_i64_i32(c->u.s32.b, cc_src);
}
break;
case CC_OP_ADDU_64:
c->u.s64.a = cc_vr;
c->g1 = true;
if (cond == TCG_COND_EQ || cond == TCG_COND_NE) {
c->u.s64.b = tcg_const_i64(0);
} else {
c->u.s64.b = cc_src;
c->g2 = true;
}
break;
case CC_OP_STATIC:
c->is_64 = false;
c->u.s32.a = cc_op;