motorhead/qemu
1
0
Fork 0
mirror of https://github.com/Motorhead1991/qemu.git synced 2025-08-03 15:53:54 -06:00
Code Issues Projects Releases Packages Wiki Activity Actions

More generic 64 bit multiplication support, by Aurelien Jarno.

Browse source 
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@2821 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
ths 2007-05-16 11:59:40 +00:00
parent 100ce98812
commit 69d357286d
7 changed files with 84 additions and 65 deletions
Download patch file Download diff file Expand all files Collapse all files

50
target-i386/helper.c
View file

@ -3620,50 +3620,6 @@ static void neg128(uint64_t *plow, uint64_t *phigh)
add128(plow, phigh, 1, 0);
}
static void mul64(uint64_t *plow, uint64_t *phigh, uint64_t a, uint64_t b)
{
uint32_t a0, a1, b0, b1;
uint64_t v;
a0 = a;
a1 = a >> 32;
b0 = b;
b1 = b >> 32;
v = (uint64_t)a0 * (uint64_t)b0;
*plow = v;
*phigh = 0;
v = (uint64_t)a0 * (uint64_t)b1;
add128(plow, phigh, v << 32, v >> 32);
v = (uint64_t)a1 * (uint64_t)b0;
add128(plow, phigh, v << 32, v >> 32);
v = (uint64_t)a1 * (uint64_t)b1;
*phigh += v;
#ifdef DEBUG_MULDIV
printf("mul: 0x%016" PRIx64 " * 0x%016" PRIx64 " = 0x%016" PRIx64 "%016" PRIx64 "\n",
a, b, *phigh, *plow);
#endif
}
static void imul64(uint64_t *plow, uint64_t *phigh, int64_t a, int64_t b)
{
int sa, sb;
sa = (a < 0);
if (sa)
a = -a;
sb = (b < 0);
if (sb)
b = -b;
mul64(plow, phigh, a, b);
if (sa ^ sb) {
neg128(plow, phigh);
}
}
/* return TRUE if overflow */
static int div64(uint64_t *plow, uint64_t *phigh, uint64_t b)
{
@ -3731,7 +3687,7 @@ void helper_mulq_EAX_T0(void)
{
uint64_t r0, r1;
mul64(&r0, &r1, EAX, T0);
mulu64(&r1, &r0, EAX, T0);
EAX = r0;
EDX = r1;
CC_DST = r0;
@ -3742,7 +3698,7 @@ void helper_imulq_EAX_T0(void)
{
uint64_t r0, r1;
imul64(&r0, &r1, EAX, T0);
muls64(&r1, &r0, EAX, T0);
EAX = r0;
EDX = r1;
CC_DST = r0;
@ -3753,7 +3709,7 @@ void helper_imulq_T0_T1(void)
{
uint64_t r0, r1;
imul64(&r0, &r1, T0, T1);
muls64(&r1, &r0, T0, T1);
T0 = r0;
CC_DST = r0;
CC_SRC = ((int64_t)r1 != ((int64_t)r0 >> 63));