diff options
| author | Richard Henderson <rth@twiddle.net> | 2015-09-14 14:39:48 +0100 |
|---|---|---|
| committer | Peter Maydell <peter.maydell@linaro.org> | 2015-09-14 14:39:48 +0100 |
| commit | 9924e85829fe21b5f38a5d267c9aea44c5d478ac (patch) | |
| tree | 6fb102a857fe258e1d0b1d1c146c04619a72c5c8 | |
| parent | ef60151bee9a95e3a5cc98b345a19ed7eb435ddb (diff) | |
target-arm: Recognize UXTB, UXTH, LSR, LSL
These are all special case aliases of UBFM.
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <rth@twiddle.net>
Message-id: 1441909103-24666-9-git-send-email-rth@twiddle.net
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
| -rw-r--r-- | target-arm/translate-a64.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/target-arm/translate-a64.c b/target-arm/translate-a64.c index 8ae68148ef..f2f8443483 100644 --- a/target-arm/translate-a64.c +++ b/target-arm/translate-a64.c @@ -3038,6 +3038,23 @@ static void disas_bitfield(DisasContext *s, uint32_t insn) tcg_gen_sari_i64(tcg_rd, tcg_tmp, ri); goto done; } + } else if (opc == 2) { /* UBFM */ + if (ri == 0) { /* UXTB, UXTH, plus non-canonical AND */ + tcg_gen_andi_i64(tcg_rd, tcg_tmp, bitmask64(si + 1)); + return; + } + if (si == 63 || (si == 31 && ri <= si)) { /* LSR */ + if (si == 31) { + tcg_gen_ext32u_i64(tcg_tmp, tcg_tmp); + } + tcg_gen_shri_i64(tcg_rd, tcg_tmp, ri); + return; + } + if (si + 1 == ri && si != bitsize - 1) { /* LSL */ + int shift = bitsize - 1 - si; + tcg_gen_shli_i64(tcg_rd, tcg_tmp, shift); + goto done; + } } if (opc != 1) { /* SBFM or UBFM */ |