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target/arm: Convert FCVTN, BFCVTN to decodetree

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Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20241211163036.2297116-51-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Richard Henderson 2024-12-11 10:30:17 -06:00 • committed by Peter Maydell
parent fbbc0b2c8a
commit febacdb237
2 changed files with 52 additions and 42 deletions
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5
target/arm/tcg/a64.decode
View file

@ -21,6 +21,7 @@
%rd 0:5
%esz_sd 22:1 !function=plus_2
%esz_hs 22:1 !function=plus_1
%esz_hsd 22:2 !function=xor_2
%hl 11:1 21:1
%hlm 11:1 20:2
@ -74,6 +75,7 @@
@qrr_b . q:1 ...... .. ...... ...... rn:5 rd:5 &qrr_e esz=0
@qrr_h . q:1 ...... .. ...... ...... rn:5 rd:5 &qrr_e esz=1
@qrr_bh . q:1 ...... . esz:1 ...... ...... rn:5 rd:5 &qrr_e
@qrr_hs . q:1 ...... .. ...... ...... rn:5 rd:5 &qrr_e esz=%esz_hs
@qrr_e . q:1 ...... esz:2 ...... ...... rn:5 rd:5 &qrr_e
@qrrr_b . q:1 ...... ... rm:5 ...... rn:5 rd:5 &qrrr_e esz=0
@ -1676,3 +1678,6 @@ XTN 0.00 1110 ..1 00001 00101 0 ..... ..... @qrr_e
SQXTUN_v 0.10 1110 ..1 00001 00101 0 ..... ..... @qrr_e
SQXTN_v 0.00 1110 ..1 00001 01001 0 ..... ..... @qrr_e
UQXTN_v 0.10 1110 ..1 00001 01001 0 ..... ..... @qrr_e
FCVTN_v 0.00 1110 0.1 00001 01101 0 ..... ..... @qrr_hs
BFCVTN_v 0.00 1110 101 00001 01101 0 ..... ..... @qrr_h

89
target/arm/tcg/translate-a64.c
View file

@ -9051,6 +9051,49 @@ TRANS(SQXTUN_v, do_2misc_narrow_vector, a, f_scalar_sqxtun)
TRANS(SQXTN_v, do_2misc_narrow_vector, a, f_scalar_sqxtn)
TRANS(UQXTN_v, do_2misc_narrow_vector, a, f_scalar_uqxtn)
static void gen_fcvtn_hs(TCGv_i64 d, TCGv_i64 n)
{
TCGv_i32 tcg_lo = tcg_temp_new_i32();
TCGv_i32 tcg_hi = tcg_temp_new_i32();
TCGv_ptr fpst = fpstatus_ptr(FPST_FPCR);
TCGv_i32 ahp = get_ahp_flag();
tcg_gen_extr_i64_i32(tcg_lo, tcg_hi, n);
gen_helper_vfp_fcvt_f32_to_f16(tcg_lo, tcg_lo, fpst, ahp);
gen_helper_vfp_fcvt_f32_to_f16(tcg_hi, tcg_hi, fpst, ahp);
tcg_gen_deposit_i32(tcg_lo, tcg_lo, tcg_hi, 16, 16);
tcg_gen_extu_i32_i64(d, tcg_lo);
}
static void gen_fcvtn_sd(TCGv_i64 d, TCGv_i64 n)
{
TCGv_i32 tmp = tcg_temp_new_i32();
gen_helper_vfp_fcvtsd(tmp, n, tcg_env);
tcg_gen_extu_i32_i64(d, tmp);
}
static ArithOneOp * const f_vector_fcvtn[] = {
NULL,
gen_fcvtn_hs,
gen_fcvtn_sd,
};
TRANS(FCVTN_v, do_2misc_narrow_vector, a, f_vector_fcvtn)
static void gen_bfcvtn_hs(TCGv_i64 d, TCGv_i64 n)
{
TCGv_ptr fpst = fpstatus_ptr(FPST_FPCR);
TCGv_i32 tmp = tcg_temp_new_i32();
gen_helper_bfcvt_pair(tmp, n, fpst);
tcg_gen_extu_i32_i64(d, tmp);
}
static ArithOneOp * const f_vector_bfcvtn[] = {
NULL,
gen_bfcvtn_hs,
NULL,
};
TRANS_FEAT(BFCVTN_v, aa64_bf16, do_2misc_narrow_vector, a, f_vector_bfcvtn)
/* Common vector code for handling integer to FP conversion */
static void handle_simd_intfp_conv(DisasContext *s, int rd, int rn,
int elements, int is_signed,
@ -9633,33 +9676,6 @@ static void handle_2misc_narrow(DisasContext *s, bool scalar,
tcg_res[pass] = tcg_temp_new_i64();
switch (opcode) {
case 0x16: /* FCVTN, FCVTN2 */
/* 32 bit to 16 bit or 64 bit to 32 bit float conversion */
if (size == 2) {
TCGv_i32 tmp = tcg_temp_new_i32();
gen_helper_vfp_fcvtsd(tmp, tcg_op, tcg_env);
tcg_gen_extu_i32_i64(tcg_res[pass], tmp);
} else {
TCGv_i32 tcg_lo = tcg_temp_new_i32();
TCGv_i32 tcg_hi = tcg_temp_new_i32();
TCGv_ptr fpst = fpstatus_ptr(FPST_FPCR);
TCGv_i32 ahp = get_ahp_flag();
tcg_gen_extr_i64_i32(tcg_lo, tcg_hi, tcg_op);
gen_helper_vfp_fcvt_f32_to_f16(tcg_lo, tcg_lo, fpst, ahp);
gen_helper_vfp_fcvt_f32_to_f16(tcg_hi, tcg_hi, fpst, ahp);
tcg_gen_deposit_i32(tcg_lo, tcg_lo, tcg_hi, 16, 16);
tcg_gen_extu_i32_i64(tcg_res[pass], tcg_lo);
}
break;
case 0x36: /* BFCVTN, BFCVTN2 */
{
TCGv_ptr fpst = fpstatus_ptr(FPST_FPCR);
TCGv_i32 tmp = tcg_temp_new_i32();
gen_helper_bfcvt_pair(tmp, tcg_op, fpst);
tcg_gen_extu_i32_i64(tcg_res[pass], tmp);
}
break;
case 0x56: /* FCVTXN, FCVTXN2 */
{
/*
@ -9675,6 +9691,8 @@ static void handle_2misc_narrow(DisasContext *s, bool scalar,
default:
case 0x12: /* XTN, SQXTUN */
case 0x14: /* SQXTN, UQXTN */
case 0x16: /* FCVTN, FCVTN2 */
case 0x36: /* BFCVTN, BFCVTN2 */
g_assert_not_reached();
}
@ -10088,21 +10106,6 @@ static void disas_simd_two_reg_misc(DisasContext *s, uint32_t insn)
unallocated_encoding(s);
return;
}
/* fall through */
case 0x16: /* FCVTN, FCVTN2 */
/* handle_2misc_narrow does a 2*size -> size operation, but these
* instructions encode the source size rather than dest size.
*/
if (!fp_access_check(s)) {
return;
}
handle_2misc_narrow(s, false, opcode, 0, is_q, size - 1, rn, rd);
return;
case 0x36: /* BFCVTN, BFCVTN2 */
if (!dc_isar_feature(aa64_bf16, s) || size != 2) {
unallocated_encoding(s);
return;
}
if (!fp_access_check(s)) {
return;
}
@ -10155,6 +10158,8 @@ static void disas_simd_two_reg_misc(DisasContext *s, uint32_t insn)
}
break;
default:
case 0x16: /* FCVTN, FCVTN2 */
case 0x36: /* BFCVTN, BFCVTN2 */
unallocated_encoding(s);
return;
}