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target-arm: A64: Add narrowing 2-reg-misc instructions 

Add the narrowing integer instructions in the 2-reg-misc class.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Peter Maydell 2014-02-03 23:31:52 +00:00
parent 86cbc418ce
commit d980fd59a4
1 changed files with 83 additions and 2 deletions
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85
target-arm/translate-a64.c
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@ -75,6 +75,8 @@ typedef struct AArch64DecodeTable {
/* Function prototype for gen_ functions for calling Neon helpers */
typedef void NeonGenTwoOpFn(TCGv_i32, TCGv_i32, TCGv_i32);
typedef void NeonGenTwoOpEnvFn(TCGv_i32, TCGv_ptr, TCGv_i32, TCGv_i32);
typedef void NeonGenNarrowFn(TCGv_i32, TCGv_i64);
typedef void NeonGenNarrowEnvFn(TCGv_i32, TCGv_ptr, TCGv_i64);
/* initialize TCG globals. */
void a64_translate_init(void)
@ -7371,6 +7373,79 @@ static void disas_simd_three_reg_same(DisasContext *s, uint32_t insn)
}
}
static void handle_2misc_narrow(DisasContext *s, int opcode, bool u, bool is_q,
int size, int rn, int rd)
{
/* Handle 2-reg-misc ops which are narrowing (so each 2*size element
* in the source becomes a size element in the destination).
*/
int pass;
TCGv_i32 tcg_res[2];
int destelt = is_q ? 2 : 0;
for (pass = 0; pass < 2; pass++) {
TCGv_i64 tcg_op = tcg_temp_new_i64();
NeonGenNarrowFn *genfn = NULL;
NeonGenNarrowEnvFn *genenvfn = NULL;
read_vec_element(s, tcg_op, rn, pass, MO_64);
tcg_res[pass] = tcg_temp_new_i32();
switch (opcode) {
case 0x12: /* XTN, SQXTUN */
{
static NeonGenNarrowFn * const xtnfns[3] = {
gen_helper_neon_narrow_u8,
gen_helper_neon_narrow_u16,
tcg_gen_trunc_i64_i32,
};
static NeonGenNarrowEnvFn * const sqxtunfns[3] = {
gen_helper_neon_unarrow_sat8,
gen_helper_neon_unarrow_sat16,
gen_helper_neon_unarrow_sat32,
};
if (u) {
genenvfn = sqxtunfns[size];
} else {
genfn = xtnfns[size];
}
break;
}
case 0x14: /* SQXTN, UQXTN */
{
static NeonGenNarrowEnvFn * const fns[3][2] = {
{ gen_helper_neon_narrow_sat_s8,
gen_helper_neon_narrow_sat_u8 },
{ gen_helper_neon_narrow_sat_s16,
gen_helper_neon_narrow_sat_u16 },
{ gen_helper_neon_narrow_sat_s32,
gen_helper_neon_narrow_sat_u32 },
};
genenvfn = fns[size][u];
break;
}
default:
g_assert_not_reached();
}
if (genfn) {
genfn(tcg_res[pass], tcg_op);
} else {
genenvfn(tcg_res[pass], cpu_env, tcg_op);
}
tcg_temp_free_i64(tcg_op);
}
for (pass = 0; pass < 2; pass++) {
write_vec_element_i32(s, tcg_res[pass], rd, destelt + pass, MO_32);
tcg_temp_free_i32(tcg_res[pass]);
}
if (!is_q) {
clear_vec_high(s, rd);
}
}
/* C3.6.17 AdvSIMD two reg misc
* 31 30 29 28 24 23 22 21 17 16 12 11 10 9 5 4 0
* +---+---+---+-----------+------+-----------+--------+-----+------+------+
@ -7405,11 +7480,17 @@ static void disas_simd_two_reg_misc(DisasContext *s, uint32_t insn)
}
unallocated_encoding(s);
return;
case 0x12: /* XTN, XTN2, SQXTUN, SQXTUN2 */
case 0x14: /* SQXTN, SQXTN2, UQXTN, UQXTN2 */
if (size == 3) {
unallocated_encoding(s);
return;
}
handle_2misc_narrow(s, opcode, u, is_q, size, rn, rd);
return;
case 0x2: /* SADDLP, UADDLP */
case 0x4: /* CLS, CLZ */
case 0x6: /* SADALP, UADALP */
case 0x12: /* XTN, XTN2, SQXTUN, SQXTUN2 */
case 0x14: /* SQXTN, SQXTN2, UQXTN, UQXTN2 */
if (size == 3) {
unallocated_encoding(s);
return;