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target-xtensa: implement MAC16 option 

See ISA, 4.3.7 for the details.

- add ACC and MR special registers;
- implement MAC16 and all inner MAC* opcode groups.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
This commit is contained in:
Max Filippov 2011-10-10 06:25:40 +04:00 committed by Blue Swirl
parent 890c6333b2
commit 6825b6c33c
2 changed files with 137 additions and 1 deletions
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3
target-xtensa/cpu.h
View File

@ -113,6 +113,9 @@ enum {
BR = 4,
LITBASE = 5,
SCOMPARE1 = 12,
ACCLO = 16,
ACCHI = 17,
MR = 32,
WINDOW_BASE = 72,
WINDOW_START = 73,
PTEVADDR = 83,

135
target-xtensa/translate.c
View File

@ -79,6 +79,12 @@ static const char * const sregnames[256] = {
[BR] = "BR",
[LITBASE] = "LITBASE",
[SCOMPARE1] = "SCOMPARE1",
[ACCLO] = "ACCLO",
[ACCHI] = "ACCHI",
[MR] = "MR0",
[MR + 1] = "MR1",
[MR + 2] = "MR2",
[MR + 3] = "MR3",
[WINDOW_BASE] = "WINDOW_BASE",
[WINDOW_START] = "WINDOW_START",
[PTEVADDR] = "PTEVADDR",
@ -447,6 +453,11 @@ static void gen_wsr_litbase(DisasContext *dc, uint32_t sr, TCGv_i32 s)
gen_jumpi_check_loop_end(dc, -1);
}
static void gen_wsr_acchi(DisasContext *dc, uint32_t sr, TCGv_i32 s)
{
tcg_gen_ext8s_i32(cpu_SR[sr], s);
}
static void gen_wsr_windowbase(DisasContext *dc, uint32_t sr, TCGv_i32 v)
{
gen_helper_wsr_windowbase(v);
@ -544,6 +555,7 @@ static void gen_wsr(DisasContext *dc, uint32_t sr, TCGv_i32 s)
[SAR] = gen_wsr_sar,
[BR] = gen_wsr_br,
[LITBASE] = gen_wsr_litbase,
[ACCHI] = gen_wsr_acchi,
[WINDOW_BASE] = gen_wsr_windowbase,
[WINDOW_START] = gen_wsr_windowstart,
[PTEVADDR] = gen_wsr_ptevaddr,
@ -628,6 +640,18 @@ static void gen_window_check3(DisasContext *dc, unsigned r1, unsigned r2,
gen_window_check2(dc, r1, r2 > r3 ? r2 : r3);
}
static TCGv_i32 gen_mac16_m(TCGv_i32 v, bool hi, bool is_unsigned)
{
TCGv_i32 m = tcg_temp_new_i32();
if (hi) {
(is_unsigned ? tcg_gen_shri_i32 : tcg_gen_sari_i32)(m, v, 16);
} else {
(is_unsigned ? tcg_gen_ext16u_i32 : tcg_gen_ext16s_i32)(m, v);
}
return m;
}
static void disas_xtensa_insn(DisasContext *dc)
{
#define HAS_OPTION_BITS(opt) do { \
@ -663,6 +687,9 @@ static void disas_xtensa_insn(DisasContext *dc)
#define RRR_S (((b1) & 0xf))
#define RRR_T (((b0) & 0xf0) >> 4)
#endif
#define RRR_X ((RRR_R & 0x4) >> 2)
#define RRR_Y ((RRR_T & 0x4) >> 2)
#define RRR_W (RRR_R & 0x3)
#define RRRN_R RRR_R
#define RRRN_S RRR_S
@ -1935,7 +1962,113 @@ static void disas_xtensa_insn(DisasContext *dc)
case 4: /*MAC16d*/
HAS_OPTION(XTENSA_OPTION_MAC16);
TBD();
{
enum {
MAC16_UMUL = 0x0,
MAC16_MUL = 0x4,
MAC16_MULA = 0x8,
MAC16_MULS = 0xc,
MAC16_NONE = 0xf,
} op = OP1 & 0xc;
bool is_m1_sr = (OP2 & 0x3) == 2;
bool is_m2_sr = (OP2 & 0xc) == 0;
uint32_t ld_offset = 0;
if (OP2 > 9) {
RESERVED();
}
switch (OP2 & 2) {
case 0: /*MACI?/MACC?*/
is_m1_sr = true;
ld_offset = (OP2 & 1) ? -4 : 4;
if (OP2 >= 8) { /*MACI/MACC*/
if (OP1 == 0) { /*LDINC/LDDEC*/
op = MAC16_NONE;
} else {
RESERVED();
}
} else if (op != MAC16_MULA) { /*MULA.*.*.LDINC/LDDEC*/
RESERVED();
}
break;
case 2: /*MACD?/MACA?*/
if (op == MAC16_UMUL && OP2 != 7) { /*UMUL only in MACAA*/
RESERVED();
}
break;
}
if (op != MAC16_NONE) {
if (!is_m1_sr) {
gen_window_check1(dc, RRR_S);
}
if (!is_m2_sr) {
gen_window_check1(dc, RRR_T);
}
}
{
TCGv_i32 vaddr = tcg_temp_new_i32();
TCGv_i32 mem32 = tcg_temp_new_i32();
if (ld_offset) {
gen_window_check1(dc, RRR_S);
tcg_gen_addi_i32(vaddr, cpu_R[RRR_S], ld_offset);
gen_load_store_alignment(dc, 2, vaddr, false);
tcg_gen_qemu_ld32u(mem32, vaddr, dc->cring);
}
if (op != MAC16_NONE) {
TCGv_i32 m1 = gen_mac16_m(
is_m1_sr ? cpu_SR[MR + RRR_X] : cpu_R[RRR_S],
OP1 & 1, op == MAC16_UMUL);
TCGv_i32 m2 = gen_mac16_m(
is_m2_sr ? cpu_SR[MR + 2 + RRR_Y] : cpu_R[RRR_T],
OP1 & 2, op == MAC16_UMUL);
if (op == MAC16_MUL || op == MAC16_UMUL) {
tcg_gen_mul_i32(cpu_SR[ACCLO], m1, m2);
if (op == MAC16_UMUL) {
tcg_gen_movi_i32(cpu_SR[ACCHI], 0);
} else {
tcg_gen_sari_i32(cpu_SR[ACCHI], cpu_SR[ACCLO], 31);
}
} else {
TCGv_i32 res = tcg_temp_new_i32();
TCGv_i64 res64 = tcg_temp_new_i64();
TCGv_i64 tmp = tcg_temp_new_i64();
tcg_gen_mul_i32(res, m1, m2);
tcg_gen_ext_i32_i64(res64, res);
tcg_gen_concat_i32_i64(tmp,
cpu_SR[ACCLO], cpu_SR[ACCHI]);
if (op == MAC16_MULA) {
tcg_gen_add_i64(tmp, tmp, res64);
} else {
tcg_gen_sub_i64(tmp, tmp, res64);
}
tcg_gen_trunc_i64_i32(cpu_SR[ACCLO], tmp);
tcg_gen_shri_i64(tmp, tmp, 32);
tcg_gen_trunc_i64_i32(cpu_SR[ACCHI], tmp);
tcg_gen_ext8s_i32(cpu_SR[ACCHI], cpu_SR[ACCHI]);
tcg_temp_free(res);
tcg_temp_free_i64(res64);
tcg_temp_free_i64(tmp);
}
tcg_temp_free(m1);
tcg_temp_free(m2);
}
if (ld_offset) {
tcg_gen_mov_i32(cpu_R[RRR_S], vaddr);
tcg_gen_mov_i32(cpu_SR[MR + RRR_W], mem32);
}
tcg_temp_free(vaddr);
tcg_temp_free(mem32);
}
}
break;
case 5: /*CALLN*/