target-arm: A64: Add SIMD modified immediate group
This patch adds support for the AdvSIMD modified immediate group (C3.6.6) with all its suboperations (movi, orr, fmov, mvni, bic). Signed-off-by: Alexander Graf <agraf@suse.de> [AJB: new decode struct, minor bug fixes, optimisation] Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Richard Henderson <rth@twiddle.net>
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@ -5293,10 +5293,128 @@ static void disas_simd_copy(DisasContext *s, uint32_t insn)
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* +---+---+----+---------------------+-----+-------+----+---+-------+------+
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* +---+---+----+---------------------+-----+-------+----+---+-------+------+
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* | 0 | Q | op | 0 1 1 1 1 0 0 0 0 0 | abc | cmode | o2 | 1 | defgh | Rd |
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* | 0 | Q | op | 0 1 1 1 1 0 0 0 0 0 | abc | cmode | o2 | 1 | defgh | Rd |
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* +---+---+----+---------------------+-----+-------+----+---+-------+------+
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* +---+---+----+---------------------+-----+-------+----+---+-------+------+
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*
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* There are a number of operations that can be carried out here:
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* MOVI - move (shifted) imm into register
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* MVNI - move inverted (shifted) imm into register
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* ORR - bitwise OR of (shifted) imm with register
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* BIC - bitwise clear of (shifted) imm with register
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*/
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*/
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static void disas_simd_mod_imm(DisasContext *s, uint32_t insn)
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static void disas_simd_mod_imm(DisasContext *s, uint32_t insn)
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{
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{
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unsupported_encoding(s, insn);
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int rd = extract32(insn, 0, 5);
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int cmode = extract32(insn, 12, 4);
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int cmode_3_1 = extract32(cmode, 1, 3);
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int cmode_0 = extract32(cmode, 0, 1);
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int o2 = extract32(insn, 11, 1);
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uint64_t abcdefgh = extract32(insn, 5, 5) | (extract32(insn, 16, 3) << 5);
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bool is_neg = extract32(insn, 29, 1);
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bool is_q = extract32(insn, 30, 1);
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uint64_t imm = 0;
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TCGv_i64 tcg_rd, tcg_imm;
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int i;
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if (o2 != 0 || ((cmode == 0xf) && is_neg && !is_q)) {
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unallocated_encoding(s);
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return;
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}
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/* See AdvSIMDExpandImm() in ARM ARM */
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switch (cmode_3_1) {
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case 0: /* Replicate(Zeros(24):imm8, 2) */
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case 1: /* Replicate(Zeros(16):imm8:Zeros(8), 2) */
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case 2: /* Replicate(Zeros(8):imm8:Zeros(16), 2) */
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case 3: /* Replicate(imm8:Zeros(24), 2) */
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{
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int shift = cmode_3_1 * 8;
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imm = bitfield_replicate(abcdefgh << shift, 32);
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break;
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}
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case 4: /* Replicate(Zeros(8):imm8, 4) */
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case 5: /* Replicate(imm8:Zeros(8), 4) */
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{
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int shift = (cmode_3_1 & 0x1) * 8;
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imm = bitfield_replicate(abcdefgh << shift, 16);
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break;
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}
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case 6:
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if (cmode_0) {
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/* Replicate(Zeros(8):imm8:Ones(16), 2) */
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imm = (abcdefgh << 16) | 0xffff;
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} else {
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/* Replicate(Zeros(16):imm8:Ones(8), 2) */
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imm = (abcdefgh << 8) | 0xff;
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}
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imm = bitfield_replicate(imm, 32);
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break;
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case 7:
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if (!cmode_0 && !is_neg) {
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imm = bitfield_replicate(abcdefgh, 8);
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} else if (!cmode_0 && is_neg) {
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int i;
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imm = 0;
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for (i = 0; i < 8; i++) {
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if ((abcdefgh) & (1 << i)) {
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imm |= 0xffULL << (i * 8);
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}
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}
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} else if (cmode_0) {
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if (is_neg) {
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imm = (abcdefgh & 0x3f) << 48;
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if (abcdefgh & 0x80) {
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imm |= 0x8000000000000000ULL;
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}
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if (abcdefgh & 0x40) {
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imm |= 0x3fc0000000000000ULL;
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} else {
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imm |= 0x4000000000000000ULL;
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}
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} else {
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imm = (abcdefgh & 0x3f) << 19;
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if (abcdefgh & 0x80) {
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imm |= 0x80000000;
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}
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if (abcdefgh & 0x40) {
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imm |= 0x3e000000;
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} else {
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imm |= 0x40000000;
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}
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imm |= (imm << 32);
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}
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}
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break;
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}
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if (cmode_3_1 != 7 && is_neg) {
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imm = ~imm;
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}
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tcg_imm = tcg_const_i64(imm);
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tcg_rd = new_tmp_a64(s);
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for (i = 0; i < 2; i++) {
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int foffs = i ? fp_reg_hi_offset(rd) : fp_reg_offset(rd, MO_64);
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if (i == 1 && !is_q) {
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/* non-quad ops clear high half of vector */
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tcg_gen_movi_i64(tcg_rd, 0);
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} else if ((cmode & 0x9) == 0x1 || (cmode & 0xd) == 0x9) {
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tcg_gen_ld_i64(tcg_rd, cpu_env, foffs);
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if (is_neg) {
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/* AND (BIC) */
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tcg_gen_and_i64(tcg_rd, tcg_rd, tcg_imm);
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} else {
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/* ORR */
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tcg_gen_or_i64(tcg_rd, tcg_rd, tcg_imm);
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}
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} else {
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/* MOVI */
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tcg_gen_mov_i64(tcg_rd, tcg_imm);
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}
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tcg_gen_st_i64(tcg_rd, cpu_env, foffs);
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}
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tcg_temp_free_i64(tcg_imm);
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}
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}
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/* C3.6.7 AdvSIMD scalar copy
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/* C3.6.7 AdvSIMD scalar copy
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