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target-tilegx: Handle bitfield instructions

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Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2015-08-21 14:06:57 -07:00
parent d5dbd6eb38
commit c06b181729
1 changed files with 74 additions and 0 deletions
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74
target-tilegx/translate.c
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@ -1125,13 +1125,87 @@ static TileExcp gen_bf_opcode_x0(DisasContext *dc, unsigned ext,
unsigned dest, unsigned srca,
unsigned bfs, unsigned bfe)
{
TCGv tdest = dest_gr(dc, dest);
TCGv tsrca = load_gr(dc, srca);
TCGv tsrcd;
int len;
const char *mnemonic;
/* The bitfield is either between E and S inclusive,
or up from S and down from E inclusive. */
if (bfs <= bfe) {
len = bfe - bfs + 1;
} else {
len = (64 - bfs) + (bfe + 1);
}
switch (ext) {
case BFEXTU_BF_OPCODE_X0:
if (bfs == 0 && bfe == 7) {
tcg_gen_ext8u_tl(tdest, tsrca);
} else if (bfs == 0 && bfe == 15) {
tcg_gen_ext16u_tl(tdest, tsrca);
} else if (bfs == 0 && bfe == 31) {
tcg_gen_ext32u_tl(tdest, tsrca);
} else {
int rol = 63 - bfe;
if (bfs <= bfe) {
tcg_gen_shli_tl(tdest, tsrca, rol);
} else {
tcg_gen_rotli_tl(tdest, tsrca, rol);
}
tcg_gen_shri_tl(tdest, tdest, (bfs + rol) & 63);
}
mnemonic = "bfextu";
break;
case BFEXTS_BF_OPCODE_X0:
if (bfs == 0 && bfe == 7) {
tcg_gen_ext8s_tl(tdest, tsrca);
} else if (bfs == 0 && bfe == 15) {
tcg_gen_ext16s_tl(tdest, tsrca);
} else if (bfs == 0 && bfe == 31) {
tcg_gen_ext32s_tl(tdest, tsrca);
} else {
int rol = 63 - bfe;
if (bfs <= bfe) {
tcg_gen_shli_tl(tdest, tsrca, rol);
} else {
tcg_gen_rotli_tl(tdest, tsrca, rol);
}
tcg_gen_sari_tl(tdest, tdest, (bfs + rol) & 63);
}
mnemonic = "bfexts";
break;
case BFINS_BF_OPCODE_X0:
tsrcd = load_gr(dc, dest);
if (bfs <= bfe) {
tcg_gen_deposit_tl(tdest, tsrcd, tsrca, bfs, len);
} else {
tcg_gen_rotri_tl(tdest, tsrcd, bfs);
tcg_gen_deposit_tl(tdest, tdest, tsrca, 0, len);
tcg_gen_rotli_tl(tdest, tdest, bfs);
}
mnemonic = "bfins";
break;
case MM_BF_OPCODE_X0:
tsrcd = load_gr(dc, dest);
if (bfs == 0) {
tcg_gen_deposit_tl(tdest, tsrca, tsrcd, 0, len);
} else {
uint64_t mask = len == 64 ? -1 : rol64((1ULL << len) - 1, bfs);
TCGv tmp = tcg_const_tl(mask);
tcg_gen_and_tl(tdest, tsrcd, tmp);
tcg_gen_andc_tl(tmp, tsrca, tmp);
tcg_gen_or_tl(tdest, tdest, tmp);
tcg_temp_free(tmp);
}
mnemonic = "mm";
break;
default:
return TILEGX_EXCP_OPCODE_UNIMPLEMENTED;
}