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target/arm: Convert Neon 'load/store single structure' to decodetree

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Convert the Neon "load/store single structure to one lane" insns to
decodetree.

As this is the last set of insns in the neon load/store group,
we can remove the whole disas_neon_ls_insn() function.

Backports commit 123ce4e3daba26b760b472687e1fb1ad82cf1993 from qemu
This commit is contained in:
Peter Maydell 2020-05-07 09:32:03 -04:00 committed by Lioncash
parent 302506f2f6
commit c7a31355fc
3 changed files with 101 additions and 148 deletions
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11
qemu/target/arm/neon-ls.decode
View file

@ -39,3 +39,14 @@ VLDST_multiple 1111 0100 0 . l:1 0 rn:4 .... itype:4 size:2 align:2 rm:4 \
VLD_all_lanes 1111 0100 1 . 1 0 rn:4 .... 11 n:2 size:2 t:1 a:1 rm:4 \
vd=%vd_dp
# Neon load/store single structure to one lane
%imm1_5_p1 5:1 !function=plus1
%imm1_6_p1 6:1 !function=plus1
VLDST_single 1111 0100 1 . l:1 0 rn:4 .... 00 n:2 reg_idx:3 align:1 rm:4 \
vd=%vd_dp size=0 stride=1
VLDST_single 1111 0100 1 . l:1 0 rn:4 .... 01 n:2 reg_idx:2 align:2 rm:4 \
vd=%vd_dp size=1 stride=%imm1_5_p1
VLDST_single 1111 0100 1 . l:1 0 rn:4 .... 10 n:2 reg_idx:1 align:3 rm:4 \
vd=%vd_dp size=2 stride=%imm1_6_p1

90
qemu/target/arm/translate-neon.inc.c
View file

@ -26,6 +26,11 @@
* It might be possible to convert it to a standalone .c file eventually.
*/
static inline int plus1(DisasContext *s, int x)
{
return x + 1;
}
/* Include the generated Neon decoder */
#include "decode-neon-dp.inc.c"
#include "decode-neon-ls.inc.c"
@ -482,3 +487,88 @@ static bool trans_VLD_all_lanes(DisasContext *s, arg_VLD_all_lanes *a)
return true;
}
static bool trans_VLDST_single(DisasContext *s, arg_VLDST_single *a)
{
/* Neon load/store single structure to one lane */
int reg;
int nregs = a->n + 1;
int vd = a->vd;
TCGv_i32 addr, tmp;
TCGContext *tcg_ctx = s->uc->tcg_ctx;
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 & 0x10)) {
return false;
}
/* Catch the UNDEF cases. This is unavoidably a bit messy. */
switch (nregs) {
case 1:
if (((a->align & (1 << a->size)) != 0) ||
(a->size == 2 && ((a->align & 3) == 1 || (a->align & 3) == 2))) {
return false;
}
break;
case 3:
if ((a->align & 1) != 0) {
return false;
}
/* fall through */
case 2:
if (a->size == 2 && (a->align & 2) != 0) {
return false;
}
break;
case 4:
if ((a->size == 2) && ((a->align & 3) == 3)) {
return false;
}
break;
default:
abort();
}
if ((vd + a->stride * (nregs - 1)) > 31) {
/*
* Attempts to write off the end of the register file are
* UNPREDICTABLE; we choose to UNDEF because otherwise we would
* access off the end of the array that holds the register data.
*/
return false;
}
if (!vfp_access_check(s)) {
return true;
}
tmp = tcg_temp_new_i32(tcg_ctx);
addr = tcg_temp_new_i32(tcg_ctx);
load_reg_var(s, addr, a->rn);
/*
* TODO: if we implemented alignment exceptions, we should check
* addr against the alignment encoded in a->align here.
*/
for (reg = 0; reg < nregs; reg++) {
if (a->l) {
gen_aa32_ld_i32(s, tmp, addr, get_mem_index(s),
s->be_data | a->size);
neon_store_element(s, vd, a->reg_idx, a->size, tmp);
} else { /* Store */
neon_load_element(s, tmp, vd, a->reg_idx, a->size);
gen_aa32_st_i32(s, tmp, addr, get_mem_index(s),
s->be_data | a->size);
}
vd += a->stride;
tcg_gen_addi_i32(tcg_ctx, addr, addr, 1 << a->size);
}
tcg_temp_free_i32(tcg_ctx, addr);
tcg_temp_free_i32(tcg_ctx, tmp);
gen_neon_ldst_base_update(s, a->rm, a->rn, (1 << a->size) * nregs);
return true;
}

148
qemu/target/arm/translate.c
View file

@ -3330,141 +3330,6 @@ static void gen_neon_trn_u16(DisasContext *s, TCGv_i32 t0, TCGv_i32 t1)
tcg_temp_free_i32(tcg_ctx, rd);
}
/* Translate a NEON load/store element instruction. Return nonzero if the
instruction is invalid. */
static int disas_neon_ls_insn(DisasContext *s, uint32_t insn)
{
TCGContext *tcg_ctx = s->uc->tcg_ctx;
int rd, rn, rm;
int nregs;
int stride;
int size;
int reg;
int load;
TCGv_i32 addr;
TCGv_i32 tmp;
if (!arm_dc_feature(s, ARM_FEATURE_NEON)) {
return 1;
}
/* FIXME: this access check should not take precedence over UNDEF
* for invalid encodings; we will generate incorrect syndrome information
* for attempts to execute invalid vfp/neon encodings with FP disabled.
*/
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;
VFP_DREG_D(rd, insn);
rn = (insn >> 16) & 0xf;
rm = insn & 0xf;
load = (insn & (1 << 21)) != 0;
if ((insn & (1 << 23)) == 0) {
/* Load store all elements -- handled already by decodetree */
return 1;
} else {
size = (insn >> 10) & 3;
if (size == 3) {
/* Load single element to all lanes -- handled by decodetree */
return 1;
} else {
/* Single element. */
int idx = (insn >> 4) & 0xf;
int reg_idx;
switch (size) {
case 0:
reg_idx = (insn >> 5) & 7;
stride = 1;
break;
case 1:
reg_idx = (insn >> 6) & 3;
stride = (insn & (1 << 5)) ? 2 : 1;
break;
case 2:
reg_idx = (insn >> 7) & 1;
stride = (insn & (1 << 6)) ? 2 : 1;
break;
default:
abort();
}
nregs = ((insn >> 8) & 3) + 1;
/* Catch the UNDEF cases. This is unavoidably a bit messy. */
switch (nregs) {
case 1:
if (((idx & (1 << size)) != 0) ||
(size == 2 && ((idx & 3) == 1 || (idx & 3) == 2))) {
return 1;
}
break;
case 3:
if ((idx & 1) != 0) {
return 1;
}
/* fall through */
case 2:
if (size == 2 && (idx & 2) != 0) {
return 1;
}
break;
case 4:
if ((size == 2) && ((idx & 3) == 3)) {
return 1;
}
break;
default:
abort();
}
if ((rd + stride * (nregs - 1)) > 31) {
/* Attempts to write off the end of the register file
* are UNPREDICTABLE; we choose to UNDEF because otherwise
* the neon_load_reg() would write off the end of the array.
*/
return 1;
}
tmp = tcg_temp_new_i32(tcg_ctx);
addr = tcg_temp_new_i32(tcg_ctx);
load_reg_var(s, addr, rn);
for (reg = 0; reg < nregs; reg++) {
if (load) {
gen_aa32_ld_i32(s, tmp, addr, get_mem_index(s),
s->be_data | size);
neon_store_element(s, rd, reg_idx, size, tmp);
} else { /* Store */
neon_load_element(s, tmp, rd, reg_idx, size);
gen_aa32_st_i32(s, tmp, addr, get_mem_index(s),
s->be_data | size);
}
rd += stride;
tcg_gen_addi_i32(tcg_ctx, addr, addr, 1 << size);
}
tcg_temp_free_i32(tcg_ctx, addr);
tcg_temp_free_i32(tcg_ctx, tmp);
stride = nregs * (1 << size);
}
}
if (rm != 15) {
TCGv_i32 base;
base = load_reg(s, rn);
if (rm == 13) {
tcg_gen_addi_i32(tcg_ctx, base, base, stride);
} else {
TCGv_i32 index;
index = load_reg(s, rm);
tcg_gen_add_i32(tcg_ctx, base, base, index);
tcg_temp_free_i32(tcg_ctx, index);
}
store_reg(s, rn, base);
}
return 0;
}
static inline void gen_neon_narrow(DisasContext *s, int size, TCGv_i32 dest, TCGv_i64 src)
{
TCGContext *tcg_ctx = s->uc->tcg_ctx;
@ -10899,13 +10764,6 @@ static void disas_arm_insn(DisasContext *s, unsigned int insn)
}
return;
}
if ((insn & 0x0f100000) == 0x04000000) {
/* NEON load/store. */
if (disas_neon_ls_insn(s, insn)) {
goto illegal_op;
}
return;
}
if ((insn & 0x0e000f00) == 0x0c000100) {
if (arm_dc_feature(s, ARM_FEATURE_IWMMXT)) {
/* iWMMXt register transfer. */
@ -11110,12 +10968,6 @@ static void disas_thumb2_insn(DisasContext *s, uint32_t insn)
}
break;
case 12:
if ((insn & 0x01100000) == 0x01000000) {
if (disas_neon_ls_insn(s, insn)) {
goto illegal_op;
}
break;
}
goto illegal_op;
default:
goto illegal_op;