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target/arm: Convert VCMLA (scalar) to decodetree

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Convert VCMLA (scalar) in the 2reg-scalar-ext group to decodetree.

Backports commit 7e1b5d615361bb0038cda0e08af41e350e42d081 from qemu
This commit is contained in:
Peter Maydell 2020-05-07 09:15:27 -04:00 committed by Lioncash
parent 1ab06d3eb5
commit 73dbfbe4d7
3 changed files with 46 additions and 25 deletions
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5
qemu/target/arm/neon-shared.decode
View file

@ -49,3 +49,8 @@ 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
VCMLA_scalar 1111 1110 0 . rot:2 .... .... 1000 . q:1 index:1 0 vm:4 \
vn=%vn_dp vd=%vd_dp size=0
VCMLA_scalar 1111 1110 1 . rot:2 .... .... 1000 . q:1 . 0 .... \
vm=%vm_dp vn=%vn_dp vd=%vd_dp size=1 index=0

40
qemu/target/arm/translate-neon.inc.c
View file

@ -172,3 +172,43 @@ static bool trans_VFML(DisasContext *s, arg_VFML *a)
return true;
}
static bool trans_VCMLA_scalar(DisasContext *s, arg_VCMLA_scalar *a)
{
gen_helper_gvec_3_ptr *fn_gvec_ptr;
int opr_sz;
TCGv_ptr fpst;
TCGContext *tcg_ctx = s->uc->tcg_ctx;
if (!dc_isar_feature(aa32_vcma, s)) {
return false;
}
if (a->size == 0 && !dc_isar_feature(aa32_fp16_arith, s)) {
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 ((a->vd | a->vn) & a->q) {
return false;
}
if (!vfp_access_check(s)) {
return true;
}
fn_gvec_ptr = (a->size ? gen_helper_gvec_fcmlas_idx
: gen_helper_gvec_fcmlah_idx);
opr_sz = (1 + a->q) * 8;
fpst = get_fpstatus_ptr(s, 1);
tcg_gen_gvec_3_ptr(tcg_ctx, vfp_reg_offset(1, a->vd),
vfp_reg_offset(1, a->vn),
vfp_reg_offset(1, a->vm),
fpst, opr_sz, opr_sz,
(a->index << 2) | a->rot, fn_gvec_ptr);
tcg_temp_free_ptr(tcg_ctx, fpst);
return true;
}

26
qemu/target/arm/translate.c
View file

@ -7182,31 +7182,7 @@ static int disas_neon_insn_2reg_scalar_ext(DisasContext *s, uint32_t insn)
bool is_long = false, q = extract32(insn, 6, 1);
bool ptr_is_env = false;
if ((insn & 0xff000f10) == 0xfe000800) {
/* VCMLA (indexed) -- 1111 1110 S.RR .... .... 1000 ...0 .... */
int rot = extract32(insn, 20, 2);
int size = extract32(insn, 23, 1);
int index;
if (!dc_isar_feature(aa32_vcma, s)) {
return 1;
}
if (size == 0) {
if (!dc_isar_feature(aa32_fp16_arith, s)) {
return 1;
}
/* For fp16, rm is just Vm, and index is M. */
rm = extract32(insn, 0, 4);
index = extract32(insn, 5, 1);
} else {
/* For fp32, rm is the usual M:Vm, and index is 0. */
VFP_DREG_M(rm, insn);
index = 0;
}
data = (index << 2) | rot;
fn_gvec_ptr = (size ? gen_helper_gvec_fcmlas_idx
: gen_helper_gvec_fcmlah_idx);
} else if ((insn & 0xffb00f00) == 0xfe200d00) {
if ((insn & 0xffb00f00) == 0xfe200d00) {
/* V[US]DOT -- 1111 1110 0.10 .... .... 1101 .Q.U .... */
int u = extract32(insn, 4, 1);