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target/arm: Convert VFM[AS]L (vector) to decodetree 

Convert the VFM[AS]L (vector) insns to decodetree.  This is the last
insn in the legacy decoder for the 3same_ext group, so we can
delete the legacy decoder function for the group entirely.

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: 20200430181003.21682-8-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2020-04-30 19:09:34 +01:00
parent 32da0e330d
commit 9a107e7b8a
3 changed files with 38 additions and 91 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
target/arm/neon-shared.decode
View File

@ -43,3 +43,9 @@ VCADD 1111 110 rot:1 1 . 0 size:1 .... .... 1000 . q:1 . 0 .... \
# VUDOT and VSDOT
VDOT 1111 110 00 . 10 .... .... 1101 . q:1 . u:1 .... \
vm=%vm_dp vn=%vn_dp vd=%vd_dp
# VFM[AS]L
VFML 1111 110 0 s:1 . 10 .... .... 1000 . 0 . 1 .... \
vm=%vm_sp vn=%vn_sp vd=%vd_dp q=0
VFML 1111 110 0 s:1 . 10 .... .... 1000 . 1 . 1 .... \
vm=%vm_dp vn=%vn_dp vd=%vd_dp q=1

31
target/arm/translate-neon.inc.c
View File

@ -136,3 +136,34 @@ static bool trans_VDOT(DisasContext *s, arg_VDOT *a)
opr_sz, opr_sz, 0, fn_gvec);
return true;
}
static bool trans_VFML(DisasContext *s, arg_VFML *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)) {
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->vm),
cpu_env, opr_sz, opr_sz, a->s, /* is_2 == 0 */
gen_helper_gvec_fmlal_a32);
return true;
}

92
target/arm/translate.c
View File

@ -7032,84 +7032,6 @@ static int disas_neon_data_insn(DisasContext *s, uint32_t insn)
return 0;
}
/* Advanced SIMD three registers of the same length extension.
* 31 25 23 22 20 16 12 11 10 9 8 3 0
* +---------------+-----+---+-----+----+----+---+----+---+----+---------+----+
* | 1 1 1 1 1 1 0 | op1 | D | op2 | Vn | Vd | 1 | o3 | 0 | o4 | N Q M U | Vm |
* +---------------+-----+---+-----+----+----+---+----+---+----+---------+----+
*/
static int disas_neon_insn_3same_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;
int data = 0;
int off_rn, off_rm;
bool is_long = false, q = extract32(insn, 6, 1);
bool ptr_is_env = false;
if ((insn & 0xff300f10) == 0xfc200810) {
/* VFM[AS]L -- 1111 1100 S.10 .... .... 1000 .Q.1 .... */
int is_s = extract32(insn, 23, 1);
if (!dc_isar_feature(aa32_fhm, s)) {
return 1;
}
is_long = true;
data = is_s; /* is_2 == 0 */
fn_gvec_ptr = gen_helper_gvec_fmlal_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);
VFP_DREG_M(rm, insn);
if ((rn | rm) & 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);
rm = VFP_SREG_M(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;
}
/* Advanced SIMD two registers and a scalar extension.
* 31 24 23 22 20 16 12 11 10 9 8 3 0
* +-----------------+----+---+----+----+----+---+----+---+----+---------+----+
@ -10956,12 +10878,6 @@ static void disas_arm_insn(DisasContext *s, unsigned int insn)
}
}
}
} else if ((insn & 0x0e000a00) == 0x0c000800
&& arm_dc_feature(s, ARM_FEATURE_V8)) {
if (disas_neon_insn_3same_ext(s, insn)) {
goto illegal_op;
}
return;
} else if ((insn & 0x0f000a00) == 0x0e000800
&& arm_dc_feature(s, ARM_FEATURE_V8)) {
if (disas_neon_insn_2reg_scalar_ext(s, insn)) {
@ -11145,15 +11061,9 @@ static void disas_thumb2_insn(DisasContext *s, uint32_t insn)
}
break;
}
if ((insn & 0xfe000a00) == 0xfc000800
if ((insn & 0xff000a00) == 0xfe000800
&& arm_dc_feature(s, ARM_FEATURE_V8)) {
/* The Thumb2 and ARM encodings are identical. */
if (disas_neon_insn_3same_ext(s, insn)) {
goto illegal_op;
}
} else 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;
}