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target-arm: A64: Implement FCVTZS, FCVTZU in the shift-imm categories

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Implement FCVTZS and FCVTZU in the shift-imm and scalar-shift-imm
categories; this completes the implementation of those two groups.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Message-id: 1394822294-14837-19-git-send-email-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2014-03-17 16:31:51 +00:00
parent a847f32c04
commit 2ed3ea110f
1 changed files with 78 additions and 2 deletions
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80
target-arm/translate-a64.c
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@ -6224,6 +6224,82 @@ static void handle_simd_shift_intfp_conv(DisasContext *s, bool is_scalar,
handle_simd_intfp_conv(s, rd, rn, elements, !is_u, fracbits, size);
}
/* FCVTZS, FVCVTZU - FP to fixedpoint conversion */
static void handle_simd_shift_fpint_conv(DisasContext *s, bool is_scalar,
bool is_q, bool is_u,
int immh, int immb, int rn, int rd)
{
bool is_double = extract32(immh, 3, 1);
int immhb = immh << 3 | immb;
int fracbits = (is_double ? 128 : 64) - immhb;
int pass;
TCGv_ptr tcg_fpstatus;
TCGv_i32 tcg_rmode, tcg_shift;
if (!extract32(immh, 2, 2)) {
unallocated_encoding(s);
return;
}
if (!is_scalar && !is_q && is_double) {
unallocated_encoding(s);
return;
}
assert(!(is_scalar && is_q));
tcg_rmode = tcg_const_i32(arm_rmode_to_sf(FPROUNDING_ZERO));
gen_helper_set_rmode(tcg_rmode, tcg_rmode, cpu_env);
tcg_fpstatus = get_fpstatus_ptr();
tcg_shift = tcg_const_i32(fracbits);
if (is_double) {
int maxpass = is_scalar ? 1 : is_q ? 2 : 1;
for (pass = 0; pass < maxpass; pass++) {
TCGv_i64 tcg_op = tcg_temp_new_i64();
read_vec_element(s, tcg_op, rn, pass, MO_64);
if (is_u) {
gen_helper_vfp_touqd(tcg_op, tcg_op, tcg_shift, tcg_fpstatus);
} else {
gen_helper_vfp_tosqd(tcg_op, tcg_op, tcg_shift, tcg_fpstatus);
}
write_vec_element(s, tcg_op, rd, pass, MO_64);
tcg_temp_free_i64(tcg_op);
}
if (!is_q) {
clear_vec_high(s, rd);
}
} else {
int maxpass = is_scalar ? 1 : is_q ? 4 : 2;
for (pass = 0; pass < maxpass; pass++) {
TCGv_i32 tcg_op = tcg_temp_new_i32();
read_vec_element_i32(s, tcg_op, rn, pass, MO_32);
if (is_u) {
gen_helper_vfp_touls(tcg_op, tcg_op, tcg_shift, tcg_fpstatus);
} else {
gen_helper_vfp_tosls(tcg_op, tcg_op, tcg_shift, tcg_fpstatus);
}
if (is_scalar) {
write_fp_sreg(s, rd, tcg_op);
} else {
write_vec_element_i32(s, tcg_op, rd, pass, MO_32);
}
tcg_temp_free_i32(tcg_op);
}
if (!is_q && !is_scalar) {
clear_vec_high(s, rd);
}
}
tcg_temp_free_ptr(tcg_fpstatus);
tcg_temp_free_i32(tcg_shift);
gen_helper_set_rmode(tcg_rmode, tcg_rmode, cpu_env);
tcg_temp_free_i32(tcg_rmode);
}
/* C3.6.9 AdvSIMD scalar shift by immediate
* 31 30 29 28 23 22 19 18 16 15 11 10 9 5 4 0
* +-----+---+-------------+------+------+--------+---+------+------+
@ -6291,7 +6367,7 @@ static void disas_simd_scalar_shift_imm(DisasContext *s, uint32_t insn)
handle_simd_qshl(s, true, false, is_u, is_u, immh, immb, rn, rd);
break;
case 0x1f: /* FCVTZS, FCVTZU */
unsupported_encoding(s, insn);
handle_simd_shift_fpint_conv(s, true, false, is_u, immh, immb, rn, rd);
break;
default:
unallocated_encoding(s);
@ -7543,7 +7619,7 @@ static void disas_simd_shift_imm(DisasContext *s, uint32_t insn)
handle_simd_qshl(s, false, is_q, is_u, is_u, immh, immb, rn, rd);
break;
case 0x1f: /* FCVTZS/ FCVTZU */
unsupported_encoding(s, insn);
handle_simd_shift_fpint_conv(s, false, is_q, is_u, immh, immb, rn, rd);
return;
default:
unallocated_encoding(s);