target-i386: Implement BEXTR
Signed-off-by: Richard Henderson <rth@twiddle.net>
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@ -4026,6 +4026,46 @@ static void gen_sse(CPUX86State *env, DisasContext *s, int b,
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set_cc_op(s, CC_OP_LOGICB + ot);
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break;
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case 0x0f7: /* bextr Gy, Ey, By */
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if (!(s->cpuid_7_0_ebx_features & CPUID_7_0_EBX_BMI1)
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|| !(s->prefix & PREFIX_VEX)
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|| s->vex_l != 0) {
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goto illegal_op;
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}
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ot = s->dflag == 2 ? OT_QUAD : OT_LONG;
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{
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TCGv bound, zero;
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gen_ldst_modrm(env, s, modrm, ot, OR_TMP0, 0);
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/* Extract START, and shift the operand.
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Shifts larger than operand size get zeros. */
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tcg_gen_ext8u_tl(cpu_A0, cpu_regs[s->vex_v]);
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tcg_gen_shr_tl(cpu_T[0], cpu_T[0], cpu_A0);
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bound = tcg_const_tl(ot == OT_QUAD ? 63 : 31);
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zero = tcg_const_tl(0);
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tcg_gen_movcond_tl(TCG_COND_LEU, cpu_T[0], cpu_A0, bound,
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cpu_T[0], zero);
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tcg_temp_free(zero);
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/* Extract the LEN into a mask. Lengths larger than
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operand size get all ones. */
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tcg_gen_shri_tl(cpu_A0, cpu_regs[s->vex_v], 8);
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tcg_gen_ext8u_tl(cpu_A0, cpu_A0);
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tcg_gen_movcond_tl(TCG_COND_LEU, cpu_A0, cpu_A0, bound,
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cpu_A0, bound);
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tcg_temp_free(bound);
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tcg_gen_movi_tl(cpu_T[1], 1);
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tcg_gen_shl_tl(cpu_T[1], cpu_T[1], cpu_A0);
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tcg_gen_subi_tl(cpu_T[1], cpu_T[1], 1);
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tcg_gen_and_tl(cpu_T[0], cpu_T[0], cpu_T[1]);
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gen_op_mov_reg_T0(ot, reg);
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gen_op_update1_cc();
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set_cc_op(s, CC_OP_LOGICB + ot);
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}
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break;
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default:
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goto illegal_op;
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}
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