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tricore: add QSEED instruction

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Signed-off-by: Andreas Konopik <andreas.konopik@efs-auto.de>
Signed-off-by: David Brenken <david.brenken@efs-auto.de>
Signed-off-by: Georg Hofstetter <georg.hofstetter@efs-auto.de>
Signed-off-by: Robert Rasche <robert.rasche@efs-auto.de>
Signed-off-by: Lars Biermanski <lars.biermanski@efs-auto.de>
Reviewed-by: Bastian Koppelmann <kbastian@mail.uni-paderborn.de>
Message-Id: <20190624070339.4408-6-david.brenken@efs-auto.org>
Signed-off-by: Bastian Koppelmann <kbastian@mail.uni-paderborn.de>
[BK: Added fp_status arg to float32_is_signaling_nan()]
This commit is contained in:
Andreas Konopik 2019-06-24 09:03:39 +02:00 committed by Bastian Koppelmann
parent ef1b1de5b3
commit 8317ea0607
3 changed files with 89 additions and 0 deletions
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85
target/tricore/fpu_helper.c
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@ -24,6 +24,7 @@
#define QUIET_NAN 0x7fc00000
#define ADD_NAN 0x7fc00001
#define SQRT_NAN 0x7fc00004
#define DIV_NAN 0x7fc00008
#define MUL_NAN 0x7fc00002
#define FPU_FS PSW_USB_C
@ -32,6 +33,9 @@
#define FPU_FZ PSW_USB_AV
#define FPU_FU PSW_USB_SAV
#define float32_sqrt_nan make_float32(SQRT_NAN)
#define float32_quiet_nan make_float32(QUIET_NAN)
/* we don't care about input_denormal */
static inline uint8_t f_get_excp_flags(CPUTriCoreState *env)
{
@ -166,6 +170,87 @@ uint32_t helper_fmul(CPUTriCoreState *env, uint32_t r1, uint32_t r2)
}
/*
* Target TriCore QSEED.F significand Lookup Table
*
* The QSEED.F output significand depends on the least-significant
* exponent bit and the 6 most-significant significand bits.
*
* IEEE 754 float datatype
* partitioned into Sign (S), Exponent (E) and Significand (M):
*
* S E E E E E E E E M M M M M M ...
* | | |
* +------+------+-------+-------+
* | |
* for lookup table
* calculating index for
* output E output M
*
* This lookup table was extracted by analyzing QSEED output
* from the real hardware
*/
static const uint8_t target_qseed_significand_table[128] = {
253, 252, 245, 244, 239, 238, 231, 230, 225, 224, 217, 216,
211, 210, 205, 204, 201, 200, 195, 194, 189, 188, 185, 184,
179, 178, 175, 174, 169, 168, 165, 164, 161, 160, 157, 156,
153, 152, 149, 148, 145, 144, 141, 140, 137, 136, 133, 132,
131, 130, 127, 126, 123, 122, 121, 120, 117, 116, 115, 114,
111, 110, 109, 108, 103, 102, 99, 98, 93, 92, 89, 88, 83,
82, 79, 78, 75, 74, 71, 70, 67, 66, 63, 62, 59, 58, 55,
54, 53, 52, 49, 48, 45, 44, 43, 42, 39, 38, 37, 36, 33,
32, 31, 30, 27, 26, 25, 24, 23, 22, 19, 18, 17, 16, 15,
14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2
};
uint32_t helper_qseed(CPUTriCoreState *env, uint32_t r1)
{
uint32_t arg1, S, E, M, E_minus_one, m_idx;
uint32_t new_E, new_M, new_S, result;
arg1 = make_float32(r1);
/* fetch IEEE-754 fields S, E and the uppermost 6-bit of M */
S = extract32(arg1, 31, 1);
E = extract32(arg1, 23, 8);
M = extract32(arg1, 17, 6);
if (float32_is_any_nan(arg1)) {
result = float32_quiet_nan;
} else if (float32_is_zero_or_denormal(arg1)) {
if (float32_is_neg(arg1)) {
result = float32_infinity | (1 << 31);
} else {
result = float32_infinity;
}
} else if (float32_is_neg(arg1)) {
result = float32_sqrt_nan;
} else if (float32_is_infinity(arg1)) {
result = float32_zero;
} else {
E_minus_one = E - 1;
m_idx = ((E_minus_one & 1) << 6) | M;
new_S = S;
new_E = 0xBD - E_minus_one / 2;
new_M = target_qseed_significand_table[m_idx];
result = 0;
result = deposit32(result, 31, 1, new_S);
result = deposit32(result, 23, 8, new_E);
result = deposit32(result, 15, 8, new_M);
}
if (float32_is_signaling_nan(arg1, &env->fp_status)
|| result == float32_sqrt_nan) {
env->FPU_FI = 1 << 31;
env->FPU_FS = 1;
} else {
env->FPU_FS = 0;
}
return (uint32_t) result;
}
uint32_t helper_fdiv(CPUTriCoreState *env, uint32_t r1, uint32_t r2)
{
uint32_t flags;

1
target/tricore/helper.h
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@ -109,6 +109,7 @@ DEF_HELPER_3(fdiv, i32, env, i32, i32)
DEF_HELPER_4(fmadd, i32, env, i32, i32, i32)
DEF_HELPER_4(fmsub, i32, env, i32, i32, i32)
DEF_HELPER_3(fcmp, i32, env, i32, i32)
DEF_HELPER_2(qseed, i32, env, i32)
DEF_HELPER_2(ftoi, i32, env, i32)
DEF_HELPER_2(itof, i32, env, i32)
DEF_HELPER_2(utof, i32, env, i32)

3
target/tricore/translate.c
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@ -6753,6 +6753,9 @@ static void decode_rr_divide(CPUTriCoreState *env, DisasContext *ctx)
case OPC2_32_RR_FTOIZ:
gen_helper_ftoiz(cpu_gpr_d[r3], cpu_env, cpu_gpr_d[r1]);
break;
case OPC2_32_RR_QSEED_F:
gen_helper_qseed(cpu_gpr_d[r3], cpu_env, cpu_gpr_d[r1]);
break;
default:
generate_trap(ctx, TRAPC_INSN_ERR, TIN2_IOPC);
}