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target/arm: Convert Neon VTBL, VTBX to decodetree 

Convert the Neon VTBL, VTBX instructions to decodetree.  The actual
implementation of the insn is copied across to the new trans function
unchanged except for renaming 'tmp5' to 'tmp4'.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Peter Maydell 2020-06-16 10:32:28 +01:00
parent 0aad761fb0
commit 54e96c744b
3 changed files with 63 additions and 37 deletions
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3
target/arm/neon-dp.decode
View File

@ -419,6 +419,9 @@ Vimm_1r 1111 001 . 1 . 000 ... .... cmode:4 0 . op:1 1 .... @1reg_imm
##################################################################
VEXT 1111 001 0 1 . 11 .... .... imm:4 . q:1 . 0 .... \
vm=%vm_dp vn=%vn_dp vd=%vd_dp
VTBL 1111 001 1 1 . 11 .... .... 10 len:2 . op:1 . 0 .... \
vm=%vm_dp vn=%vn_dp vd=%vd_dp
]
# Subgroup for size != 0b11

56
target/arm/translate-neon.inc.c
View File

@ -2888,3 +2888,59 @@ static bool trans_VEXT(DisasContext *s, arg_VEXT *a)
}
return true;
}
static bool trans_VTBL(DisasContext *s, arg_VTBL *a)
{
int n;
TCGv_i32 tmp, tmp2, tmp3, tmp4;
TCGv_ptr ptr1;
if (!arm_dc_feature(s, ARM_FEATURE_NEON)) {
return false;
}
/* UNDEF accesses to D16-D31 if they don't exist. */
if (!dc_isar_feature(aa32_simd_r32, s) &&
((a->vd | a->vn | a->vm) & 0x10)) {
return false;
}
if (!vfp_access_check(s)) {
return true;
}
n = a->len + 1;
if ((a->vn + n) > 32) {
/*
* This is UNPREDICTABLE; we choose to UNDEF to avoid the
* helper function running off the end of the register file.
*/
return false;
}
n <<= 3;
if (a->op) {
tmp = neon_load_reg(a->vd, 0);
} else {
tmp = tcg_temp_new_i32();
tcg_gen_movi_i32(tmp, 0);
}
tmp2 = neon_load_reg(a->vm, 0);
ptr1 = vfp_reg_ptr(true, a->vn);
tmp4 = tcg_const_i32(n);
gen_helper_neon_tbl(tmp2, tmp2, tmp, ptr1, tmp4);
tcg_temp_free_i32(tmp);
if (a->op) {
tmp = neon_load_reg(a->vd, 1);
} else {
tmp = tcg_temp_new_i32();
tcg_gen_movi_i32(tmp, 0);
}
tmp3 = neon_load_reg(a->vm, 1);
gen_helper_neon_tbl(tmp3, tmp3, tmp, ptr1, tmp4);
tcg_temp_free_i32(tmp4);
tcg_temp_free_ptr(ptr1);
neon_store_reg(a->vd, 0, tmp2);
neon_store_reg(a->vd, 1, tmp3);
tcg_temp_free_i32(tmp);
return true;
}

41
target/arm/translate.c
View File

@ -5025,13 +5025,12 @@ static int disas_neon_data_insn(DisasContext *s, uint32_t insn)
{
int op;
int q;
int rd, rn, rm, rd_ofs, rm_ofs;
int rd, rm, rd_ofs, rm_ofs;
int size;
int pass;
int u;
int vec_size;
TCGv_i32 tmp, tmp2, tmp3, tmp5;
TCGv_ptr ptr1;
TCGv_i32 tmp, tmp2, tmp3;
if (!arm_dc_feature(s, ARM_FEATURE_NEON)) {
return 1;
@ -5052,7 +5051,6 @@ static int disas_neon_data_insn(DisasContext *s, uint32_t insn)
q = (insn & (1 << 6)) != 0;
u = (insn >> 24) & 1;
VFP_DREG_D(rd, insn);
VFP_DREG_N(rn, insn);
VFP_DREG_M(rm, insn);
size = (insn >> 20) & 3;
vec_size = q ? 16 : 8;
@ -5577,39 +5575,8 @@ static int disas_neon_data_insn(DisasContext *s, uint32_t insn)
break;
}
} else if ((insn & (1 << 10)) == 0) {
/* VTBL, VTBX. */
int n = ((insn >> 8) & 3) + 1;
if ((rn + n) > 32) {
/* This is UNPREDICTABLE; we choose to UNDEF to avoid the
* helper function running off the end of the register file.
*/
return 1;
}
n <<= 3;
if (insn & (1 << 6)) {
tmp = neon_load_reg(rd, 0);
} else {
tmp = tcg_temp_new_i32();
tcg_gen_movi_i32(tmp, 0);
}
tmp2 = neon_load_reg(rm, 0);
ptr1 = vfp_reg_ptr(true, rn);
tmp5 = tcg_const_i32(n);
gen_helper_neon_tbl(tmp2, tmp2, tmp, ptr1, tmp5);
tcg_temp_free_i32(tmp);
if (insn & (1 << 6)) {
tmp = neon_load_reg(rd, 1);
} else {
tmp = tcg_temp_new_i32();
tcg_gen_movi_i32(tmp, 0);
}
tmp3 = neon_load_reg(rm, 1);
gen_helper_neon_tbl(tmp3, tmp3, tmp, ptr1, tmp5);
tcg_temp_free_i32(tmp5);
tcg_temp_free_ptr(ptr1);
neon_store_reg(rd, 0, tmp2);
neon_store_reg(rd, 1, tmp3);
tcg_temp_free_i32(tmp);
/* VTBL, VTBX: handled by decodetree */
return 1;
} else if ((insn & 0x380) == 0) {
/* VDUP */
int element;