diff options
Diffstat (limited to 'target-arm/translate-a64.c')
| -rw-r--r-- | target-arm/translate-a64.c | 24 |
1 files changed, 23 insertions, 1 deletions
diff --git a/target-arm/translate-a64.c b/target-arm/translate-a64.c index d17ca19f03..8ae68148ef 100644 --- a/target-arm/translate-a64.c +++ b/target-arm/translate-a64.c @@ -3017,7 +3017,28 @@ static void disas_bitfield(DisasContext *s, uint32_t insn) tcg_rd = cpu_reg(s, rd); tcg_tmp = read_cpu_reg(s, rn, sf); - /* OPTME: probably worth recognizing common cases of ext{8,16,32}{u,s} */ + /* Recognize the common aliases. */ + if (opc == 0) { /* SBFM */ + if (ri == 0) { + if (si == 7) { /* SXTB */ + tcg_gen_ext8s_i64(tcg_rd, tcg_tmp); + goto done; + } else if (si == 15) { /* SXTH */ + tcg_gen_ext16s_i64(tcg_rd, tcg_tmp); + goto done; + } else if (si == 31) { /* SXTW */ + tcg_gen_ext32s_i64(tcg_rd, tcg_tmp); + goto done; + } + } + if (si == 63 || (si == 31 && ri <= si)) { /* ASR */ + if (si == 31) { + tcg_gen_ext32s_i64(tcg_tmp, tcg_tmp); + } + tcg_gen_sari_i64(tcg_rd, tcg_tmp, ri); + goto done; + } + } if (opc != 1) { /* SBFM or UBFM */ tcg_gen_movi_i64(tcg_rd, 0); @@ -3042,6 +3063,7 @@ static void disas_bitfield(DisasContext *s, uint32_t insn) tcg_gen_sari_i64(tcg_rd, tcg_rd, 64 - (pos + len)); } + done: if (!sf) { /* zero extend final result */ tcg_gen_ext32u_i64(tcg_rd, tcg_rd); } |