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s390x/tcg: Implement VECTOR COUNT LEADING ZEROS

Browse source 
For 8/16, use the 32 bit variant and properly subtract the added
leading zero bits.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: David Hildenbrand <david@redhat.com>
This commit is contained in:
David Hildenbrand 2019-04-04 14:37:17 +02:00
parent ff825c6d64
commit 28863f1dbd
4 changed files with 49 additions and 0 deletions
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2
target/s390x/helper.h
View file

@ -150,6 +150,8 @@ DEF_HELPER_FLAGS_4(gvec_vavg8, TCG_CALL_NO_RWG, void, ptr, cptr, cptr, i32)
DEF_HELPER_FLAGS_4(gvec_vavg16, TCG_CALL_NO_RWG, void, ptr, cptr, cptr, i32)
DEF_HELPER_FLAGS_4(gvec_vavgl8, TCG_CALL_NO_RWG, void, ptr, cptr, cptr, i32)
DEF_HELPER_FLAGS_4(gvec_vavgl16, TCG_CALL_NO_RWG, void, ptr, cptr, cptr, i32)
DEF_HELPER_FLAGS_3(gvec_vclz8, TCG_CALL_NO_RWG, void, ptr, cptr, i32)
DEF_HELPER_FLAGS_3(gvec_vclz16, TCG_CALL_NO_RWG, void, ptr, cptr, i32)
#ifndef CONFIG_USER_ONLY
DEF_HELPER_3(servc, i32, env, i64, i64)

2
target/s390x/insn-data.def
View file

@ -1084,6 +1084,8 @@
E(0xe7fb, VCH, VRR_b, V, 0, 0, 0, 0, vc, 0, TCG_COND_GT, IF_VEC)
/* VECTOR COMPARE HIGH LOGICAL */
E(0xe7f9, VCHL, VRR_b, V, 0, 0, 0, 0, vc, 0, TCG_COND_GTU, IF_VEC)
/* VECTOR COUNT LEADING ZEROS */
F(0xe753, VCLZ, VRR_a, V, 0, 0, 0, 0, vclz, 0, IF_VEC)
#ifndef CONFIG_USER_ONLY
/* COMPARE AND SWAP AND PURGE */

31
target/s390x/translate_vx.inc.c
View file

@ -182,6 +182,9 @@ static void get_vec_element_ptr_i64(TCGv_ptr ptr, uint8_t reg, TCGv_i64 enr,
tcg_temp_free_i64(tmp);
}
#define gen_gvec_2(v1, v2, gen) \
tcg_gen_gvec_2(vec_full_reg_offset(v1), vec_full_reg_offset(v2), \
16, 16, gen)
#define gen_gvec_3(v1, v2, v3, gen) \
tcg_gen_gvec_3(vec_full_reg_offset(v1), vec_full_reg_offset(v2), \
vec_full_reg_offset(v3), 16, 16, gen)
@ -1417,3 +1420,31 @@ static DisasJumpType op_vc(DisasContext *s, DisasOps *o)
}
return DISAS_NEXT;
}
static void gen_clz_i32(TCGv_i32 d, TCGv_i32 a)
{
tcg_gen_clzi_i32(d, a, 32);
}
static void gen_clz_i64(TCGv_i64 d, TCGv_i64 a)
{
tcg_gen_clzi_i64(d, a, 64);
}
static DisasJumpType op_vclz(DisasContext *s, DisasOps *o)
{
const uint8_t es = get_field(s->fields, m3);
static const GVecGen2 g[4] = {
{ .fno = gen_helper_gvec_vclz8, },
{ .fno = gen_helper_gvec_vclz16, },
{ .fni4 = gen_clz_i32, },
{ .fni8 = gen_clz_i64, },
};
if (es > ES_64) {
gen_program_exception(s, PGM_SPECIFICATION);
return DISAS_NORETURN;
}
gen_gvec_2(get_field(s->fields, v1), get_field(s->fields, v2), &g[es]);
return DISAS_NEXT;
}

14
target/s390x/vec_int_helper.c
View file

@ -46,3 +46,17 @@ void HELPER(gvec_vavgl##BITS)(void *v1, const void *v2, const void *v3, \
}
DEF_VAVGL(8)
DEF_VAVGL(16)
#define DEF_VCLZ(BITS) \
void HELPER(gvec_vclz##BITS)(void *v1, const void *v2, uint32_t desc) \
{ \
int i; \
\
for (i = 0; i < (128 / BITS); i++) { \
const uint##BITS##_t a = s390_vec_read_element##BITS(v2, i); \
\
s390_vec_write_element##BITS(v1, i, clz32(a) - 32 + BITS); \
} \
}
DEF_VCLZ(8)
DEF_VCLZ(16)