david.venhoff/QEMU-Nyx-fork
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

target-i386: Implement BEXTR

Browse Source 
Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2013-01-23 16:21:33 -08:00
parent 7073fbada7
commit c7ab7565bc
1 changed files with 40 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

40
target-i386/translate.c
View File

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