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target/arm: Convert VFM[AS]L (scalar) to decodetree
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Convert the VFM[AS]L (scalar) insns in the 2reg-scalar-ext group
to decodetree. These are the last ones in the group so we can remove
all the legacy decode for the group.

Note that in disas_thumb2_insn() the parts of this encoding space
where the decodetree decoder returns false will correctly be directed
to illegal_op by the "(insn & (1 << 28))" check so they won't fall
into disas_coproc_insn() by mistake.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20200430181003.21682-11-peter.maydell@linaro.org
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pm215 committed May 4, 2020
1 parent 35f5d4d commit d27e82f
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Showing 3 changed files with 40 additions and 106 deletions.
7 changes: 7 additions & 0 deletions target/arm/neon-shared.decode
View file
Expand Up @@ -57,3 +57,10 @@ VCMLA_scalar 1111 1110 1 . rot:2 .... .... 1000 . q:1 . 0 .... \

VDOT_scalar 1111 1110 0 . 10 .... .... 1101 . q:1 index:1 u:1 rm:4 \
vm=%vm_dp vn=%vn_dp vd=%vd_dp

%vfml_scalar_q0_rm 0:3 5:1
%vfml_scalar_q1_index 5:1 3:1
VFML_scalar 1111 1110 0 . 0 s:1 .... .... 1000 . 0 . 1 index:1 ... \
rm=%vfml_scalar_q0_rm vn=%vn_sp vd=%vd_dp q=0
VFML_scalar 1111 1110 0 . 0 s:1 .... .... 1000 . 1 . 1 . rm:3 \
index=%vfml_scalar_q1_index vn=%vn_dp vd=%vd_dp q=1
32 changes: 32 additions & 0 deletions target/arm/translate-neon.inc.c
View file
Expand Up @@ -242,3 +242,35 @@ static bool trans_VDOT_scalar(DisasContext *s, arg_VDOT_scalar *a)
tcg_temp_free_ptr(fpst);
return true;
}

static bool trans_VFML_scalar(DisasContext *s, arg_VFML_scalar *a)
{
int opr_sz;

if (!dc_isar_feature(aa32_fhm, s)) {
return false;
}

/* UNDEF accesses to D16-D31 if they don't exist. */
if (!dc_isar_feature(aa32_simd_r32, s) &&
((a->vd & 0x10) || (a->q && (a->vn & 0x10)))) {
return false;
}

if (a->vd & a->q) {
return false;
}

if (!vfp_access_check(s)) {
return true;
}

opr_sz = (1 + a->q) * 8;
tcg_gen_gvec_3_ptr(vfp_reg_offset(1, a->vd),
vfp_reg_offset(a->q, a->vn),
vfp_reg_offset(a->q, a->rm),
cpu_env, opr_sz, opr_sz,
(a->index << 2) | a->s, /* is_2 == 0 */
gen_helper_gvec_fmlal_idx_a32);
return true;
}
107 changes: 1 addition & 106 deletions target/arm/translate.c
View file
Expand Up @@ -2610,8 +2610,6 @@ static int disas_dsp_insn(DisasContext *s, uint32_t insn)
}

#define VFP_REG_SHR(x, n) (((n) > 0) ? (x) >> (n) : (x) << -(n))
#define VFP_SREG(insn, bigbit, smallbit) \
((VFP_REG_SHR(insn, bigbit - 1) & 0x1e) | (((insn) >> (smallbit)) & 1))
#define VFP_DREG(reg, insn, bigbit, smallbit) do { \
if (dc_isar_feature(aa32_simd_r32, s)) { \
reg = (((insn) >> (bigbit)) & 0x0f) \
Expand All @@ -2622,11 +2620,8 @@ static int disas_dsp_insn(DisasContext *s, uint32_t insn)
reg = ((insn) >> (bigbit)) & 0x0f; \
}} while (0)

#define VFP_SREG_D(insn) VFP_SREG(insn, 12, 22)
#define VFP_DREG_D(reg, insn) VFP_DREG(reg, insn, 12, 22)
#define VFP_SREG_N(insn) VFP_SREG(insn, 16, 7)
#define VFP_DREG_N(reg, insn) VFP_DREG(reg, insn, 16, 7)
#define VFP_SREG_M(insn) VFP_SREG(insn, 0, 5)
#define VFP_DREG_M(reg, insn) VFP_DREG(reg, insn, 0, 5)

static void gen_neon_dup_low16(TCGv_i32 var)
Expand Down Expand Up @@ -7032,94 +7027,6 @@ static int disas_neon_data_insn(DisasContext *s, uint32_t insn)
return 0;
}

/* Advanced SIMD two registers and a scalar extension.
* 31 24 23 22 20 16 12 11 10 9 8 3 0
* +-----------------+----+---+----+----+----+---+----+---+----+---------+----+
* | 1 1 1 1 1 1 1 0 | o1 | D | o2 | Vn | Vd | 1 | o3 | 0 | o4 | N Q M U | Vm |
* +-----------------+----+---+----+----+----+---+----+---+----+---------+----+
*
*/

static int disas_neon_insn_2reg_scalar_ext(DisasContext *s, uint32_t insn)
{
gen_helper_gvec_3 *fn_gvec = NULL;
gen_helper_gvec_3_ptr *fn_gvec_ptr = NULL;
int rd, rn, rm, opr_sz, data;
int off_rn, off_rm;
bool is_long = false, q = extract32(insn, 6, 1);
bool ptr_is_env = false;

if ((insn & 0xffa00f10) == 0xfe000810) {
/* VFM[AS]L -- 1111 1110 0.0S .... .... 1000 .Q.1 .... */
int is_s = extract32(insn, 20, 1);
int vm20 = extract32(insn, 0, 3);
int vm3 = extract32(insn, 3, 1);
int m = extract32(insn, 5, 1);
int index;

if (!dc_isar_feature(aa32_fhm, s)) {
return 1;
}
if (q) {
rm = vm20;
index = m * 2 + vm3;
} else {
rm = vm20 * 2 + m;
index = vm3;
}
is_long = true;
data = (index << 2) | is_s; /* is_2 == 0 */
fn_gvec_ptr = gen_helper_gvec_fmlal_idx_a32;
ptr_is_env = true;
} else {
return 1;
}

VFP_DREG_D(rd, insn);
if (rd & q) {
return 1;
}
if (q || !is_long) {
VFP_DREG_N(rn, insn);
if (rn & q & !is_long) {
return 1;
}
off_rn = vfp_reg_offset(1, rn);
off_rm = vfp_reg_offset(1, rm);
} else {
rn = VFP_SREG_N(insn);
off_rn = vfp_reg_offset(0, rn);
off_rm = vfp_reg_offset(0, rm);
}
if (s->fp_excp_el) {
gen_exception_insn(s, s->pc_curr, EXCP_UDEF,
syn_simd_access_trap(1, 0xe, false), s->fp_excp_el);
return 0;
}
if (!s->vfp_enabled) {
return 1;
}

opr_sz = (1 + q) * 8;
if (fn_gvec_ptr) {
TCGv_ptr ptr;
if (ptr_is_env) {
ptr = cpu_env;
} else {
ptr = get_fpstatus_ptr(1);
}
tcg_gen_gvec_3_ptr(vfp_reg_offset(1, rd), off_rn, off_rm, ptr,
opr_sz, opr_sz, data, fn_gvec_ptr);
if (!ptr_is_env) {
tcg_temp_free_ptr(ptr);
}
} else {
tcg_gen_gvec_3_ool(vfp_reg_offset(1, rd), off_rn, off_rm,
opr_sz, opr_sz, data, fn_gvec);
}
return 0;
}

static int disas_coproc_insn(DisasContext *s, uint32_t insn)
{
int cpnum, is64, crn, crm, opc1, opc2, isread, rt, rt2;
Expand Down Expand Up @@ -10843,12 +10750,6 @@ static void disas_arm_insn(DisasContext *s, unsigned int insn)
}
}
}
} else if ((insn & 0x0f000a00) == 0x0e000800
&& arm_dc_feature(s, ARM_FEATURE_V8)) {
if (disas_neon_insn_2reg_scalar_ext(s, insn)) {
goto illegal_op;
}
return;
}
goto illegal_op;
}
Expand Down Expand Up @@ -11026,13 +10927,7 @@ static void disas_thumb2_insn(DisasContext *s, uint32_t insn)
}
break;
}
if ((insn & 0xff000a00) == 0xfe000800
&& arm_dc_feature(s, ARM_FEATURE_V8)) {
/* The Thumb2 and ARM encodings are identical. */
if (disas_neon_insn_2reg_scalar_ext(s, insn)) {
goto illegal_op;
}
} else if (((insn >> 24) & 3) == 3) {
if (((insn >> 24) & 3) == 3) {
/* Translate into the equivalent ARM encoding. */
insn = (insn & 0xe2ffffff) | ((insn & (1 << 28)) >> 4) | (1 << 28);
if (disas_neon_data_insn(s, insn)) {
Expand Down

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