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target/arm: Convert Neon VDUP (scalar) to decodetree

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Convert the Neon VDUP (scalar) insn to decodetree.  (Note that we
can't call this just "VDUP" as we used that already in vfp.decode for
the "VDUP (general purpose register" insn.)

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 54e96c744b
commit 9aaa23c2ae
3 changed files with 34 additions and 24 deletions
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7
target/arm/neon-dp.decode
View file

@ -422,6 +422,13 @@ Vimm_1r 1111 001 . 1 . 000 ... .... cmode:4 0 . op:1 1 .... @1reg_imm
VTBL 1111 001 1 1 . 11 .... .... 10 len:2 . op:1 . 0 .... \
vm=%vm_dp vn=%vn_dp vd=%vd_dp
VDUP_scalar 1111 001 1 1 . 11 index:3 1 .... 11 000 q:1 . 0 .... \
vm=%vm_dp vd=%vd_dp size=0
VDUP_scalar 1111 001 1 1 . 11 index:2 10 .... 11 000 q:1 . 0 .... \
vm=%vm_dp vd=%vd_dp size=1
VDUP_scalar 1111 001 1 1 . 11 index:1 100 .... 11 000 q:1 . 0 .... \
vm=%vm_dp vd=%vd_dp size=2
]
# Subgroup for size != 0b11

26
target/arm/translate-neon.inc.c
View file

@ -2944,3 +2944,29 @@ static bool trans_VTBL(DisasContext *s, arg_VTBL *a)
tcg_temp_free_i32(tmp);
return true;
}
static bool trans_VDUP_scalar(DisasContext *s, arg_VDUP_scalar *a)
{
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->vm) & 0x10)) {
return false;
}
if (a->vd & a->q) {
return false;
}
if (!vfp_access_check(s)) {
return true;
}
tcg_gen_gvec_dup_mem(a->size, neon_reg_offset(a->vd, 0),
neon_element_offset(a->vm, a->index, a->size),
a->q ? 16 : 8, a->q ? 16 : 8);
return true;
}

25
target/arm/translate.c
View file

@ -5574,31 +5574,8 @@ static int disas_neon_data_insn(DisasContext *s, uint32_t insn)
}
break;
}
} else if ((insn & (1 << 10)) == 0) {
/* VTBL, VTBX: handled by decodetree */
return 1;
} else if ((insn & 0x380) == 0) {
/* VDUP */
int element;
MemOp size;
if ((insn & (7 << 16)) == 0 || (q && (rd & 1))) {
return 1;
}
if (insn & (1 << 16)) {
size = MO_8;
element = (insn >> 17) & 7;
} else if (insn & (1 << 17)) {
size = MO_16;
element = (insn >> 18) & 3;
} else {
size = MO_32;
element = (insn >> 19) & 1;
}
tcg_gen_gvec_dup_mem(size, neon_reg_offset(rd, 0),
neon_element_offset(rm, element, size),
q ? 16 : 8, q ? 16 : 8);
} else {
/* VTBL, VTBX, VDUP: handled by decodetree */
return 1;
}
}