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target/arm: Convert VCVT fixed-point ops to decodetree 

Convert the VCVT fixed-point conversion operations in the
Neon 2-regs-and-shift group to decodetree.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20200522145520.6778-9-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2020-05-22 15:55:19 +01:00
parent 968bf84274
commit 3da26f1171
3 changed files with 62 additions and 73 deletions
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11
target/arm/neon-dp.decode
View File

@ -251,6 +251,10 @@ VMINNM_fp_3s 1111 001 1 0 . 1 . .... .... 1111 ... 1 .... @3same_fp
@2reg_shll_b .... ... . . . 001 shift:3 .... .... 0 . . . .... \
&2reg_shift vm=%vm_dp vd=%vd_dp size=0 q=0
# We use size=0 for fp32 and size=1 for fp16 to match the 3-same encodings.
@2reg_vcvt .... ... . . . 1 ..... .... .... . q:1 . . .... \
&2reg_shift vm=%vm_dp vd=%vd_dp size=0 shift=%neon_rshift_i5
VSHR_S_2sh 1111 001 0 1 . ...... .... 0000 . . . 1 .... @2reg_shr_d
VSHR_S_2sh 1111 001 0 1 . ...... .... 0000 . . . 1 .... @2reg_shr_s
VSHR_S_2sh 1111 001 0 1 . ...... .... 0000 . . . 1 .... @2reg_shr_h
@ -364,3 +368,10 @@ VSHLL_S_2sh 1111 001 0 1 . ...... .... 1010 . 0 . 1 .... @2reg_shll_b
VSHLL_U_2sh 1111 001 1 1 . ...... .... 1010 . 0 . 1 .... @2reg_shll_s
VSHLL_U_2sh 1111 001 1 1 . ...... .... 1010 . 0 . 1 .... @2reg_shll_h
VSHLL_U_2sh 1111 001 1 1 . ...... .... 1010 . 0 . 1 .... @2reg_shll_b
# VCVT fixed<->float conversions
# TODO: FP16 fixed<->float conversions are opc==0b1100 and 0b1101
VCVT_SF_2sh 1111 001 0 1 . ...... .... 1110 0 . . 1 .... @2reg_vcvt
VCVT_UF_2sh 1111 001 1 1 . ...... .... 1110 0 . . 1 .... @2reg_vcvt
VCVT_FS_2sh 1111 001 0 1 . ...... .... 1111 0 . . 1 .... @2reg_vcvt
VCVT_FU_2sh 1111 001 1 1 . ...... .... 1111 0 . . 1 .... @2reg_vcvt

49
target/arm/translate-neon.inc.c
View File

@ -1659,3 +1659,52 @@ static bool trans_VSHLL_U_2sh(DisasContext *s, arg_2reg_shift *a)
};
return do_vshll_2sh(s, a, widenfn[a->size], true);
}
static bool do_fp_2sh(DisasContext *s, arg_2reg_shift *a,
NeonGenTwoSingleOPFn *fn)
{
/* FP operations in 2-reg-and-shift group */
TCGv_i32 tmp, shiftv;
TCGv_ptr fpstatus;
int pass;
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->vm | a->vd) & a->q) {
return false;
}
if (!vfp_access_check(s)) {
return true;
}
fpstatus = get_fpstatus_ptr(1);
shiftv = tcg_const_i32(a->shift);
for (pass = 0; pass < (a->q ? 4 : 2); pass++) {
tmp = neon_load_reg(a->vm, pass);
fn(tmp, tmp, shiftv, fpstatus);
neon_store_reg(a->vd, pass, tmp);
}
tcg_temp_free_ptr(fpstatus);
tcg_temp_free_i32(shiftv);
return true;
}
#define DO_FP_2SH(INSN, FUNC) \
static bool trans_##INSN##_2sh(DisasContext *s, arg_2reg_shift *a) \
{ \
return do_fp_2sh(s, a, FUNC); \
}
DO_FP_2SH(VCVT_SF, gen_helper_vfp_sltos)
DO_FP_2SH(VCVT_UF, gen_helper_vfp_ultos)
DO_FP_2SH(VCVT_FS, gen_helper_vfp_tosls_round_to_zero)
DO_FP_2SH(VCVT_FU, gen_helper_vfp_touls_round_to_zero)

75
target/arm/translate.c
View File

@ -5193,7 +5193,6 @@ static int disas_neon_data_insn(DisasContext *s, uint32_t insn)
int q;
int rd, rn, rm, rd_ofs, rn_ofs, rm_ofs;
int size;
int shift;
int pass;
int u;
int vec_size;
@ -5234,78 +5233,8 @@ static int disas_neon_data_insn(DisasContext *s, uint32_t insn)
return 1;
} else if (insn & (1 << 4)) {
if ((insn & 0x00380080) != 0) {
/* Two registers and shift. */
op = (insn >> 8) & 0xf;
switch (op) {
case 0: /* VSHR */
case 1: /* VSRA */
case 2: /* VRSHR */
case 3: /* VRSRA */
case 4: /* VSRI */
case 5: /* VSHL, VSLI */
case 6: /* VQSHLU */
case 7: /* VQSHL */
case 8: /* VSHRN, VRSHRN, VQSHRUN, VQRSHRUN */
case 9: /* VQSHRN, VQRSHRN */
case 10: /* VSHLL, including VMOVL */
return 1; /* handled by decodetree */
default:
break;
}
if (insn & (1 << 7)) {
/* 64-bit shift. */
if (op > 7) {
return 1;
}
size = 3;
} else {
size = 2;
while ((insn & (1 << (size + 19))) == 0)
size--;
}
shift = (insn >> 16) & ((1 << (3 + size)) - 1);
if (op >= 14) {
/* VCVT fixed-point. */
TCGv_ptr fpst;
TCGv_i32 shiftv;
VFPGenFixPointFn *fn;
if (!(insn & (1 << 21)) || (q && ((rd | rm) & 1))) {
return 1;
}
if (!(op & 1)) {
if (u) {
fn = gen_helper_vfp_ultos;
} else {
fn = gen_helper_vfp_sltos;
}
} else {
if (u) {
fn = gen_helper_vfp_touls_round_to_zero;
} else {
fn = gen_helper_vfp_tosls_round_to_zero;
}
}
/* We have already masked out the must-be-1 top bit of imm6,
* hence this 32-shift where the ARM ARM has 64-imm6.
*/
shift = 32 - shift;
fpst = get_fpstatus_ptr(1);
shiftv = tcg_const_i32(shift);
for (pass = 0; pass < (q ? 4 : 2); pass++) {
TCGv_i32 tmpf = neon_load_reg(rm, pass);
fn(tmpf, tmpf, shiftv, fpst);
neon_store_reg(rd, pass, tmpf);
}
tcg_temp_free_ptr(fpst);
tcg_temp_free_i32(shiftv);
} else {
return 1;
}
/* Two registers and shift: handled by decodetree */
return 1;
} else { /* (insn & 0x00380080) == 0 */
int invert, reg_ofs, vec_size;