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target-arm: A64: Add 1-source 32-to-32 and 64-to-64 FP instructions

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This patch adds support for those instructions in the  "Floating-point
data-processing (1 source)" group which are simple 32-bit-to-32-bit
or 64-bit-to-64-bit operations (ie everything except FCVT between
single/double/half precision).

We put the new round-to-int helpers in helper.c because they will
also be used by the new ARMv8 A32/T32 rounding instructions.

Signed-off-by: Alexander Graf <agraf@suse.de>
[WN: Commit message tweak, merged single and double precision patches,
 updated to new infrastructure.]
Signed-off-by: Will Newton <will.newton@linaro.org>
[PMM: reworked decode, split FCVT out into their own patch]
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Peter Maydell 2014-01-07 17:19:14 +00:00
parent c436d40614
commit d9b0848d94
3 changed files with 191 additions and 1 deletions
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45
target-arm/helper.c
View File

@ -4353,3 +4353,48 @@ float64 VFP_HELPER(muladd, d)(float64 a, float64 b, float64 c, void *fpstp)
float_status *fpst = fpstp;
return float64_muladd(a, b, c, 0, fpst);
}
/* ARMv8 round to integral */
float32 HELPER(rints_exact)(float32 x, void *fp_status)
{
return float32_round_to_int(x, fp_status);
}
float64 HELPER(rintd_exact)(float64 x, void *fp_status)
{
return float64_round_to_int(x, fp_status);
}
float32 HELPER(rints)(float32 x, void *fp_status)
{
int old_flags = get_float_exception_flags(fp_status), new_flags;
float32 ret;
ret = float32_round_to_int(x, fp_status);
/* Suppress any inexact exceptions the conversion produced */
if (!(old_flags & float_flag_inexact)) {
new_flags = get_float_exception_flags(fp_status);
set_float_exception_flags(new_flags & ~float_flag_inexact, fp_status);
}
return ret;
}
float64 HELPER(rintd)(float64 x, void *fp_status)
{
int old_flags = get_float_exception_flags(fp_status), new_flags;
float64 ret;
ret = float64_round_to_int(x, fp_status);
new_flags = get_float_exception_flags(fp_status);
/* Suppress any inexact exceptions the conversion produced */
if (!(old_flags & float_flag_inexact)) {
new_flags = get_float_exception_flags(fp_status);
set_float_exception_flags(new_flags & ~float_flag_inexact, fp_status);
}
return ret;
}

5
target-arm/helper.h
View File

@ -171,6 +171,11 @@ DEF_HELPER_3(shr_cc, i32, env, i32, i32)
DEF_HELPER_3(sar_cc, i32, env, i32, i32)
DEF_HELPER_3(ror_cc, i32, env, i32, i32)
DEF_HELPER_FLAGS_2(rints_exact, TCG_CALL_NO_RWG, f32, f32, ptr)
DEF_HELPER_FLAGS_2(rintd_exact, TCG_CALL_NO_RWG, f64, f64, ptr)
DEF_HELPER_FLAGS_2(rints, TCG_CALL_NO_RWG, f32, f32, ptr)
DEF_HELPER_FLAGS_2(rintd, TCG_CALL_NO_RWG, f64, f64, ptr)
/* neon_helper.c */
DEF_HELPER_3(neon_qadd_u8, i32, env, i32, i32)
DEF_HELPER_3(neon_qadd_s8, i32, env, i32, i32)

142
target-arm/translate-a64.c
View File

@ -3386,6 +3386,118 @@ static void disas_fp_csel(DisasContext *s, uint32_t insn)
}
}
/* C3.6.25 Floating-point data-processing (1 source) - single precision */
static void handle_fp_1src_single(DisasContext *s, int opcode, int rd, int rn)
{
TCGv_ptr fpst;
TCGv_i32 tcg_op;
TCGv_i32 tcg_res;
fpst = get_fpstatus_ptr();
tcg_op = read_fp_sreg(s, rn);
tcg_res = tcg_temp_new_i32();
switch (opcode) {
case 0x0: /* FMOV */
tcg_gen_mov_i32(tcg_res, tcg_op);
break;
case 0x1: /* FABS */
gen_helper_vfp_abss(tcg_res, tcg_op);
break;
case 0x2: /* FNEG */
gen_helper_vfp_negs(tcg_res, tcg_op);
break;
case 0x3: /* FSQRT */
gen_helper_vfp_sqrts(tcg_res, tcg_op, cpu_env);
break;
case 0x8: /* FRINTN */
case 0x9: /* FRINTP */
case 0xa: /* FRINTM */
case 0xb: /* FRINTZ */
case 0xc: /* FRINTA */
{
TCGv_i32 tcg_rmode = tcg_const_i32(arm_rmode_to_sf(opcode & 7));
gen_helper_set_rmode(tcg_rmode, tcg_rmode, cpu_env);
gen_helper_rints(tcg_res, tcg_op, fpst);
gen_helper_set_rmode(tcg_rmode, tcg_rmode, cpu_env);
tcg_temp_free_i32(tcg_rmode);
break;
}
case 0xe: /* FRINTX */
gen_helper_rints_exact(tcg_res, tcg_op, fpst);
break;
case 0xf: /* FRINTI */
gen_helper_rints(tcg_res, tcg_op, fpst);
break;
default:
abort();
}
write_fp_sreg(s, rd, tcg_res);
tcg_temp_free_ptr(fpst);
tcg_temp_free_i32(tcg_op);
tcg_temp_free_i32(tcg_res);
}
/* C3.6.25 Floating-point data-processing (1 source) - double precision */
static void handle_fp_1src_double(DisasContext *s, int opcode, int rd, int rn)
{
TCGv_ptr fpst;
TCGv_i64 tcg_op;
TCGv_i64 tcg_res;
fpst = get_fpstatus_ptr();
tcg_op = read_fp_dreg(s, rn);
tcg_res = tcg_temp_new_i64();
switch (opcode) {
case 0x0: /* FMOV */
tcg_gen_mov_i64(tcg_res, tcg_op);
break;
case 0x1: /* FABS */
gen_helper_vfp_absd(tcg_res, tcg_op);
break;
case 0x2: /* FNEG */
gen_helper_vfp_negd(tcg_res, tcg_op);
break;
case 0x3: /* FSQRT */
gen_helper_vfp_sqrtd(tcg_res, tcg_op, cpu_env);
break;
case 0x8: /* FRINTN */
case 0x9: /* FRINTP */
case 0xa: /* FRINTM */
case 0xb: /* FRINTZ */
case 0xc: /* FRINTA */
{
TCGv_i32 tcg_rmode = tcg_const_i32(arm_rmode_to_sf(opcode & 7));
gen_helper_set_rmode(tcg_rmode, tcg_rmode, cpu_env);
gen_helper_rintd(tcg_res, tcg_op, fpst);
gen_helper_set_rmode(tcg_rmode, tcg_rmode, cpu_env);
tcg_temp_free_i32(tcg_rmode);
break;
}
case 0xe: /* FRINTX */
gen_helper_rintd_exact(tcg_res, tcg_op, fpst);
break;
case 0xf: /* FRINTI */
gen_helper_rintd(tcg_res, tcg_op, fpst);
break;
default:
abort();
}
write_fp_dreg(s, rd, tcg_res);
tcg_temp_free_ptr(fpst);
tcg_temp_free_i64(tcg_op);
tcg_temp_free_i64(tcg_res);
}
/* C3.6.25 Floating point data-processing (1 source)
* 31 30 29 28 24 23 22 21 20 15 14 10 9 5 4 0
* +---+---+---+-----------+------+---+--------+-----------+------+------+
@ -3394,7 +3506,35 @@ static void disas_fp_csel(DisasContext *s, uint32_t insn)
*/
static void disas_fp_1src(DisasContext *s, uint32_t insn)
{
unsupported_encoding(s, insn);
int type = extract32(insn, 22, 2);
int opcode = extract32(insn, 15, 6);
int rn = extract32(insn, 5, 5);
int rd = extract32(insn, 0, 5);
switch (opcode) {
case 0x4: case 0x5: case 0x7:
/* FCVT between half, single and double precision */
unsupported_encoding(s, insn);
break;
case 0x0 ... 0x3:
case 0x8 ... 0xc:
case 0xe ... 0xf:
/* 32-to-32 and 64-to-64 ops */
switch (type) {
case 0:
handle_fp_1src_single(s, opcode, rd, rn);
break;
case 1:
handle_fp_1src_double(s, opcode, rd, rn);
break;
default:
unallocated_encoding(s);
}
break;
default:
unallocated_encoding(s);
break;
}
}
/* C3.6.26 Floating-point data-processing (2 source) - single precision */