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target-ppc: keep only the table version for mfrom 

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

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6007 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
aurel32 2008-12-13 12:30:21 +00:00
parent be94c952e4
commit 5e9ae189f8
1 changed files with 4 additions and 18 deletions
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28
target-ppc/op_helper.c
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@ -1865,30 +1865,16 @@ void helper_rfsvc (void)
/* 602 specific instructions */ /* 602 specific instructions */
/* mfrom is the most crazy instruction ever seen, imho ! */ /* mfrom is the most crazy instruction ever seen, imho ! */
/* Real implementation uses a ROM table. Do the same */ /* Real implementation uses a ROM table. Do the same */
#if !defined (CONFIG_USER_ONLY) /* Extremly decomposed:
#define USE_MFROM_ROM_TABLE
target_ulong helper_602_mfrom (target_ulong arg)
{
if (likely(arg < 602)) {
#if defined(USE_MFROM_ROM_TABLE)
#include "mfrom_table.c"
return mfrom_ROM_table[arg];
#else
double d;
/* Extremly decomposed:
* -arg / 256 * -arg / 256
* return 256 * log10(10 + 1.0) + 0.5 * return 256 * log10(10 + 1.0) + 0.5
*/ */
d = arg; #if !defined (CONFIG_USER_ONLY)
d = float64_div(d, 256, &env->fp_status); target_ulong helper_602_mfrom (target_ulong arg)
d = float64_chs(d); {
d = exp10(d); // XXX: use float emulation function if (likely(arg < 602)) {
d = float64_add(d, 1.0, &env->fp_status); #include "mfrom_table.c"
d = log10(d); // XXX: use float emulation function return mfrom_ROM_table[arg];
d = float64_mul(d, 256, &env->fp_status);
d = float64_add(d, 0.5, &env->fp_status);
return float64_round_to_int(d, &env->fp_status);
#endif
} else { } else {
return 0; return 0;
} }