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target-arm: Recognize UXTB, UXTH, LSR, LSL

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These are all special case aliases of UBFM.

Backports commit 9924e85829fe21b5f38a5d267c9aea44c5d478ac from qemu
This commit is contained in:
Richard Henderson 2018-02-11 01:33:47 -05:00 committed by Lioncash
parent d9e4e70636
commit c637a97270
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1 changed files with 17 additions and 0 deletions
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17
qemu/target-arm/translate-a64.c
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@ -3032,6 +3032,23 @@ static void disas_bitfield(DisasContext *s, uint32_t insn)
tcg_gen_sari_i64(tcg_ctx, 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_ctx, tcg_rd, tcg_tmp, bitmask64(si + 1));
return;
}
if (si == 63 || (si == 31 && ri <= si)) { /* LSR */
if (si == 31) {
tcg_gen_ext32u_i64(tcg_ctx, tcg_tmp, tcg_tmp);
}
tcg_gen_shri_i64(tcg_ctx, tcg_rd, tcg_tmp, ri);
return;
}
if (si + 1 == ri && si != bitsize - 1) { /* LSL */
int shift = bitsize - 1 - si;
tcg_gen_shli_i64(tcg_ctx, tcg_rd, tcg_tmp, shift);
goto done;
}
}
if (opc != 1) { /* SBFM or UBFM */