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target/arm: Convert Neon 2-reg-scalar VQRDMLAH, VQRDMLSH to decodetree

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Convert the VQRDMLAH and VQRDMLSH insns in the 2-reg-scalar
group to decodetree.

Backports commit aa318f5b9b4ab3b6744b5305dd8ae9b96676f20e from qemu
This commit is contained in:
Peter Maydell 2020-06-17 00:15:16 -04:00 committed by Lioncash
parent c0551804d4
commit 088a1e8ba9
3 changed files with 80 additions and 36 deletions
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3
qemu/target/arm/neon-dp.decode
View file

@ -488,5 +488,8 @@ Vimm_1r 1111 001 . 1 . 000 ... .... cmode:4 0 . op:1 1 .... @1reg_imm
VQDMULH_2sc 1111 001 . 1 . .. .... .... 1100 . 1 . 0 .... @2scalar
VQRDMULH_2sc 1111 001 . 1 . .. .... .... 1101 . 1 . 0 .... @2scalar
VQRDMLAH_2sc 1111 001 . 1 . .. .... .... 1110 . 1 . 0 .... @2scalar
VQRDMLSH_2sc 1111 001 . 1 . .. .... .... 1111 . 1 . 0 .... @2scalar
]
}

75
qemu/target/arm/translate-neon.inc.c
View file

@ -2605,3 +2605,78 @@ static bool trans_VQRDMULH_2sc(DisasContext *s, arg_2scalar *a)
return do_2scalar(s, a, opfn[a->size], NULL);
}
static bool do_vqrdmlah_2sc(DisasContext *s, arg_2scalar *a,
NeonGenThreeOpEnvFn *opfn)
{
/*
* VQRDMLAH/VQRDMLSH: this is like do_2scalar, but the opfn
* performs a kind of fused op-then-accumulate using a helper
* function that takes all of rd, rn and the scalar at once.
*/
TCGContext *tcg_ctx = s->uc->tcg_ctx;
TCGv_i32 scalar;
int pass;
if (!arm_dc_feature(s, ARM_FEATURE_NEON)) {
return false;
}
if (!dc_isar_feature(aa32_rdm, 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 (!opfn) {
/* Bad size (including size == 3, which is a different insn group) */
return false;
}
if (a->q && ((a->vd | a->vn) & 1)) {
return false;
}
if (!vfp_access_check(s)) {
return true;
}
scalar = neon_get_scalar(s, a->size, a->vm);
for (pass = 0; pass < (a->q ? 4 : 2); pass++) {
TCGv_i32 rn = neon_load_reg(s, a->vn, pass);
TCGv_i32 rd = neon_load_reg(s, a->vd, pass);
opfn(tcg_ctx, rd, tcg_ctx->cpu_env, rn, scalar, rd);
tcg_temp_free_i32(tcg_ctx, rn);
neon_store_reg(s, a->vd, pass, rd);
}
tcg_temp_free_i32(tcg_ctx, scalar);
return true;
}
static bool trans_VQRDMLAH_2sc(DisasContext *s, arg_2scalar *a)
{
static NeonGenThreeOpEnvFn *opfn[] = {
NULL,
gen_helper_neon_qrdmlah_s16,
gen_helper_neon_qrdmlah_s32,
NULL,
};
return do_vqrdmlah_2sc(s, a, opfn[a->size]);
}
static bool trans_VQRDMLSH_2sc(DisasContext *s, arg_2scalar *a)
{
static NeonGenThreeOpEnvFn *opfn[] = {
NULL,
gen_helper_neon_qrdmlsh_s16,
gen_helper_neon_qrdmlsh_s32,
NULL,
};
return do_vqrdmlah_2sc(s, a, opfn[a->size]);
}

38
qemu/target/arm/translate.c
View file

@ -5297,6 +5297,8 @@ static int disas_neon_data_insn(DisasContext *s, uint32_t insn)
case 9: /* Floating point VMUL scalar */
case 12: /* VQDMULH scalar */
case 13: /* VQRDMULH scalar */
case 14: /* VQRDMLAH scalar */
case 15: /* VQRDMLSH scalar */
return 1; /* handled by decodetree */
case 3: /* VQDMLAL scalar */
@ -5356,42 +5358,6 @@ static int disas_neon_data_insn(DisasContext *s, uint32_t insn)
neon_store_reg64(s, s->V0, rd + pass);
}
break;
case 14: /* VQRDMLAH scalar */
case 15: /* VQRDMLSH scalar */
{
NeonGenThreeOpEnvFn *fn;
if (!dc_isar_feature(aa32_rdm, s)) {
return 1;
}
if (u && ((rd | rn) & 1)) {
return 1;
}
if (op == 14) {
if (size == 1) {
fn = gen_helper_neon_qrdmlah_s16;
} else {
fn = gen_helper_neon_qrdmlah_s32;
}
} else {
if (size == 1) {
fn = gen_helper_neon_qrdmlsh_s16;
} else {
fn = gen_helper_neon_qrdmlsh_s32;
}
}
tmp2 = neon_get_scalar(s, size, rm);
for (pass = 0; pass < (u ? 4 : 2); pass++) {
tmp = neon_load_reg(s, rn, pass);
tmp3 = neon_load_reg(s, rd, pass);
fn(tcg_ctx, tmp, tcg_ctx->cpu_env, tmp, tmp2, tmp3);
tcg_temp_free_i32(tcg_ctx, tmp3);
neon_store_reg(s, rd, pass, tmp);
}
tcg_temp_free_i32(tcg_ctx, tmp2);
}
break;
default:
g_assert_not_reached();
}