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target-ppc: convert mfrom instruction to TCG 

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5823 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
aurel32 2008-11-30 16:23:35 +00:00
parent e49a3c8f85
commit cf02a65c77
4 changed files with 11 additions and 20 deletions
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2
target-ppc/helper.h
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@ -144,6 +144,8 @@ DEF_HELPER_1(load_6xx_tlbd, void, tl)
DEF_HELPER_1(load_6xx_tlbi, void, tl)
DEF_HELPER_1(load_74xx_tlbd, void, tl)
DEF_HELPER_1(load_74xx_tlbi, void, tl)
DEF_HELPER_1(602_mfrom, tl, tl)
#endif
#include "def-helper.h"

9
target-ppc/op.c
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@ -684,15 +684,6 @@ void OPPROTO op_POWER_rfsvc (void)
}
#endif
/* PowerPC 602 specific instruction */
#if !defined(CONFIG_USER_ONLY)
void OPPROTO op_602_mfrom (void)
{
do_op_602_mfrom();
RETURN();
}
#endif
/* PowerPC 4xx specific micro-ops */
void OPPROTO op_load_dcr (void)
{

16
target-ppc/op_helper.c
View File

@ -1645,19 +1645,19 @@ void do_store_hid0_601 (void)
/* mfrom is the most crazy instruction ever seen, imho ! */
/* Real implementation uses a ROM table. Do the same */
#define USE_MFROM_ROM_TABLE
void do_op_602_mfrom (void)
target_ulong helper_602_mfrom (target_ulong arg)
{
if (likely(T0 < 602)) {
if (likely(arg < 602)) {
#if defined(USE_MFROM_ROM_TABLE)
#include "mfrom_table.c"
T0 = mfrom_ROM_table[T0];
return mfrom_ROM_table[T0];
#else
double d;
/* Extremly decomposed:
* -T0 / 256
* T0 = 256 * log10(10 + 1.0) + 0.5
* -arg / 256
* return 256 * log10(10 + 1.0) + 0.5
*/
d = T0;
d = arg;
d = float64_div(d, 256, &env->fp_status);
d = float64_chs(d);
d = exp10(d); // XXX: use float emulation function
@ -1665,10 +1665,10 @@ void do_op_602_mfrom (void)
d = log10(d); // XXX: use float emulation function
d = float64_mul(d, 256, &env->fp_status);
d = float64_add(d, 0.5, &env->fp_status);
T0 = float64_round_to_int(d, &env->fp_status);
return float64_round_to_int(d, &env->fp_status);
#endif
} else {
T0 = 0;
return 0;
}
}

4
target-ppc/translate.c
View File

@ -4948,9 +4948,7 @@ GEN_HANDLER(mfrom, 0x1F, 0x09, 0x08, 0x03E0F801, PPC_602_SPEC)
GEN_EXCP_PRIVOPC(ctx);
return;
}
tcg_gen_mov_tl(cpu_T[0], cpu_gpr[rA(ctx->opcode)]);
gen_op_602_mfrom();
tcg_gen_mov_tl(cpu_gpr[rD(ctx->opcode)], cpu_T[0]);
gen_helper_602_mfrom(cpu_gpr[rD(ctx->opcode)], cpu_gpr[rA(ctx->opcode)]);
#endif
}