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target-xtensa: implement FP0 conversions 

These are FP to integer and integer to FP conversion opcodes.
See ISA, 4.3.10 for more details.

Note that ISA description for utrunc.s is currently incorrect and will
be fixed in future revisions.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
This commit is contained in:
Max Filippov 2012-09-19 04:23:57 +04:00 committed by Blue Swirl
parent 0b6df8385d
commit b7ee8c6a32
3 changed files with 89 additions and 0 deletions
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4
target-xtensa/helper.h
View File

@ -44,5 +44,9 @@ DEF_HELPER_3(sub_s, f32, env, f32, f32)
DEF_HELPER_3(mul_s, f32, env, f32, f32)
DEF_HELPER_4(madd_s, f32, env, f32, f32, f32)
DEF_HELPER_4(msub_s, f32, env, f32, f32, f32)
DEF_HELPER_FLAGS_3(ftoi, TCG_CALL_CONST | TCG_CALL_PURE, i32, f32, i32, i32)
DEF_HELPER_FLAGS_3(ftoui, TCG_CALL_CONST | TCG_CALL_PURE, i32, f32, i32, i32)
DEF_HELPER_3(itof, f32, env, i32, i32)
DEF_HELPER_3(uitof, f32, env, i32, i32)
#include "def-helper.h"

37
target-xtensa/op_helper.c
View File

@ -821,3 +821,40 @@ float32 HELPER(msub_s)(CPUXtensaState *env, float32 a, float32 b, float32 c)
return float32_muladd(b, c, a, float_muladd_negate_product,
&env->fp_status);
}
uint32_t HELPER(ftoi)(float32 v, uint32_t rounding_mode, uint32_t scale)
{
float_status fp_status = {0};
set_float_rounding_mode(rounding_mode, &fp_status);
return float32_to_int32(
float32_scalbn(v, scale, &fp_status), &fp_status);
}
uint32_t HELPER(ftoui)(float32 v, uint32_t rounding_mode, uint32_t scale)
{
float_status fp_status = {0};
float32 res;
set_float_rounding_mode(rounding_mode, &fp_status);
res = float32_scalbn(v, scale, &fp_status);
if (float32_is_neg(v) && !float32_is_any_nan(v)) {
return float32_to_int32(res, &fp_status);
} else {
return float32_to_uint32(res, &fp_status);
}
}
float32 HELPER(itof)(CPUXtensaState *env, uint32_t v, uint32_t scale)
{
return float32_scalbn(int32_to_float32(v, &env->fp_status),
(int32_t)scale, &env->fp_status);
}
float32 HELPER(uitof)(CPUXtensaState *env, uint32_t v, uint32_t scale)
{
return float32_scalbn(uint32_to_float32(v, &env->fp_status),
(int32_t)scale, &env->fp_status);
}

48
target-xtensa/translate.c
View File

@ -1933,6 +1933,54 @@ static void disas_xtensa_insn(DisasContext *dc)
cpu_FR[RRR_R], cpu_FR[RRR_S], cpu_FR[RRR_T]);
break;
case 8: /*ROUND.Sf*/
case 9: /*TRUNC.Sf*/
case 10: /*FLOOR.Sf*/
case 11: /*CEIL.Sf*/
case 14: /*UTRUNC.Sf*/
gen_window_check1(dc, RRR_R);
{
static const unsigned rounding_mode_const[] = {
float_round_nearest_even,
float_round_to_zero,
float_round_down,
float_round_up,
[6] = float_round_to_zero,
};
TCGv_i32 rounding_mode = tcg_const_i32(
rounding_mode_const[OP2 & 7]);
TCGv_i32 scale = tcg_const_i32(RRR_T);
if (OP2 == 14) {
gen_helper_ftoui(cpu_R[RRR_R], cpu_FR[RRR_S],
rounding_mode, scale);
} else {
gen_helper_ftoi(cpu_R[RRR_R], cpu_FR[RRR_S],
rounding_mode, scale);
}
tcg_temp_free(rounding_mode);
tcg_temp_free(scale);
}
break;
case 12: /*FLOAT.Sf*/
case 13: /*UFLOAT.Sf*/
gen_window_check1(dc, RRR_S);
{
TCGv_i32 scale = tcg_const_i32(-RRR_T);
if (OP2 == 13) {
gen_helper_uitof(cpu_FR[RRR_R], cpu_env,
cpu_R[RRR_S], scale);
} else {
gen_helper_itof(cpu_FR[RRR_R], cpu_env,
cpu_R[RRR_S], scale);
}
tcg_temp_free(scale);
}
break;
case 15: /*FP1OP*/
switch (RRR_T) {
case 0: /*MOV.Sf*/