diff options
| author | Claudio Fontana <claudio.fontana@linaro.org> | 2013-12-17 19:42:35 +0000 |
|---|---|---|
| committer | Peter Maydell <peter.maydell@linaro.org> | 2013-12-17 20:12:51 +0000 |
| commit | 680ead216e666e5cc192fe86adf30563999a5dd8 (patch) | |
| tree | 1035f957eeb4315cf8f448ed6c429670819fdaf7 /target-arm | |
| parent | 6c1adc919b6a81e008b919c53902b4877ef4d737 (diff) | |
target-arm: A64: add support for 1-src data processing and CLZ
This patch adds support for decoding 1-src data processing insns,
and the first user, C5.6.40 CLZ (count leading zeroes).
Signed-off-by: Claudio Fontana <claudio.fontana@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Diffstat (limited to 'target-arm')
| -rw-r--r-- | target-arm/helper-a64.c | 5 | ||||
| -rw-r--r-- | target-arm/helper-a64.h | 1 | ||||
| -rw-r--r-- | target-arm/translate-a64.c | 52 |
3 files changed, 56 insertions, 2 deletions
diff --git a/target-arm/helper-a64.c b/target-arm/helper-a64.c index abb98c00b5..e4c534640e 100644 --- a/target-arm/helper-a64.c +++ b/target-arm/helper-a64.c @@ -44,3 +44,8 @@ int64_t HELPER(sdiv64)(int64_t num, int64_t den) } return num / den; } + +uint64_t HELPER(clz64)(uint64_t x) +{ + return clz64(x); +} diff --git a/target-arm/helper-a64.h b/target-arm/helper-a64.h index e0d65066ab..b10b6c38e7 100644 --- a/target-arm/helper-a64.h +++ b/target-arm/helper-a64.h @@ -18,3 +18,4 @@ */ DEF_HELPER_FLAGS_2(udiv64, TCG_CALL_NO_RWG_SE, i64, i64, i64) DEF_HELPER_FLAGS_2(sdiv64, TCG_CALL_NO_RWG_SE, s64, s64, s64) +DEF_HELPER_FLAGS_1(clz64, TCG_CALL_NO_RWG_SE, i64, i64) diff --git a/target-arm/translate-a64.c b/target-arm/translate-a64.c index acf30c3d30..e5481da0f6 100644 --- a/target-arm/translate-a64.c +++ b/target-arm/translate-a64.c @@ -1044,10 +1044,58 @@ static void disas_cond_select(DisasContext *s, uint32_t insn) } } -/* Data-processing (1 source) */ +static void handle_clz(DisasContext *s, unsigned int sf, + unsigned int rn, unsigned int rd) +{ + TCGv_i64 tcg_rd, tcg_rn; + tcg_rd = cpu_reg(s, rd); + tcg_rn = cpu_reg(s, rn); + + if (sf) { + gen_helper_clz64(tcg_rd, tcg_rn); + } else { + TCGv_i32 tcg_tmp32 = tcg_temp_new_i32(); + tcg_gen_trunc_i64_i32(tcg_tmp32, tcg_rn); + gen_helper_clz(tcg_tmp32, tcg_tmp32); + tcg_gen_extu_i32_i64(tcg_rd, tcg_tmp32); + tcg_temp_free_i32(tcg_tmp32); + } +} + +/* C3.5.7 Data-processing (1 source) + * 31 30 29 28 21 20 16 15 10 9 5 4 0 + * +----+---+---+-----------------+---------+--------+------+------+ + * | sf | 1 | S | 1 1 0 1 0 1 1 0 | opcode2 | opcode | Rn | Rd | + * +----+---+---+-----------------+---------+--------+------+------+ + */ static void disas_data_proc_1src(DisasContext *s, uint32_t insn) { - unsupported_encoding(s, insn); + unsigned int sf, opcode, rn, rd; + + if (extract32(insn, 29, 1) || extract32(insn, 16, 5)) { + unallocated_encoding(s); + return; + } + + sf = extract32(insn, 31, 1); + opcode = extract32(insn, 10, 6); + rn = extract32(insn, 5, 5); + rd = extract32(insn, 0, 5); + + switch (opcode) { + case 0: /* RBIT */ + case 1: /* REV16 */ + case 2: /* REV32 */ + case 3: /* REV64 */ + unsupported_encoding(s, insn); + break; + case 4: /* CLZ */ + handle_clz(s, sf, rn, rd); + break; + case 5: /* CLS */ + unsupported_encoding(s, insn); + break; + } } static void handle_div(DisasContext *s, bool is_signed, unsigned int sf, |