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target-s390: Optimize XC 

Notice XC with same address and convert that to store of zero.

Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2012-09-19 13:48:46 -07:00
parent 90b4f8ad72
commit d074ac6d26
2 changed files with 48 additions and 4 deletions
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2
target-s390x/insn-data.def
View File

@ -271,7 +271,7 @@
C(0xb982, XGR, RRE, Z, r1, r2, r1, 0, xor, nz64)
C(0xb9e7, XGRK, RRF_a, DO, r2, r3, r1, 0, xor, nz64)
C(0xe382, XG, RXY_a, Z, r1, m2_64, r1, 0, xor, nz64)
C(0xd700, XC, SS_a, Z, la1, a2, 0, 0, xc, 0)
C(0xd700, XC, SS_a, Z, 0, 0, 0, 0, xc, 0)
/* EXCLUSIVE OR IMMEDIATE */
D(0xc006, XIHF, RIL_a, EI, r1_o, i2_32u, r1, 0, xori, 0, 0x2020)
D(0xc007, XILF, RIL_a, EI, r1_o, i2_32u, r1, 0, xori, 0, 0x2000)

50
target-s390x/translate.c
View File

@ -3403,10 +3403,54 @@ static ExitStatus op_unpk(DisasContext *s, DisasOps *o)
static ExitStatus op_xc(DisasContext *s, DisasOps *o)
{
TCGv_i32 l = tcg_const_i32(get_field(s->fields, l1));
int d1 = get_field(s->fields, d1);
int d2 = get_field(s->fields, d2);
int b1 = get_field(s->fields, b1);
int b2 = get_field(s->fields, b2);
int l = get_field(s->fields, l1);
TCGv_i32 t32;
o->addr1 = get_address(s, 0, b1, d1);
/* If the addresses are identical, this is a store/memset of zero. */
if (b1 == b2 && d1 == d2 && (l + 1) <= 32) {
o->in2 = tcg_const_i64(0);
l++;
while (l >= 8) {
tcg_gen_qemu_st64(o->in2, o->addr1, get_mem_index(s));
l -= 8;
if (l > 0) {
tcg_gen_addi_i64(o->addr1, o->addr1, 8);
}
}
if (l >= 4) {
tcg_gen_qemu_st32(o->in2, o->addr1, get_mem_index(s));
l -= 4;
if (l > 0) {
tcg_gen_addi_i64(o->addr1, o->addr1, 4);
}
}
if (l >= 2) {
tcg_gen_qemu_st16(o->in2, o->addr1, get_mem_index(s));
l -= 2;
if (l > 0) {
tcg_gen_addi_i64(o->addr1, o->addr1, 2);
}
}
if (l) {
tcg_gen_qemu_st8(o->in2, o->addr1, get_mem_index(s));
}
gen_op_movi_cc(s, 0);
return NO_EXIT;
}
/* But in general we'll defer to a helper. */
o->in2 = get_address(s, 0, b2, d2);
t32 = tcg_const_i32(l);
potential_page_fault(s);
gen_helper_xc(cc_op, cpu_env, l, o->addr1, o->in2);
tcg_temp_free_i32(l);
gen_helper_xc(cc_op, cpu_env, t32, o->addr1, o->in2);
tcg_temp_free_i32(t32);
set_cc_static(s);
return NO_EXIT;
}