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powerpc div and rint fixes

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git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@81 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
bellard 2003-04-07 21:34:14 +00:00
parent 7fe70ecc56
commit 51fe68905b
1 changed files with 44 additions and 0 deletions
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44
op-i386.c
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@ -412,6 +412,22 @@ void OPPROTO op_idivw_AX_T0(void)
EDX = (EDX & 0xffff0000) | r;
}
#ifdef BUGGY_GCC_DIV64
/* gcc 2.95.4 on PowerPC does not seem to like using __udivdi3, so we
call it from another function */
uint32_t div64(uint32_t *q_ptr, uint64_t num, uint32_t den)
{
*q_ptr = num / den;
return num % den;
}
int32_t idiv64(int32_t *q_ptr, int64_t num, int32_t den)
{
*q_ptr = num / den;
return num % den;
}
#endif
void OPPROTO op_divl_EAX_T0(void)
{
unsigned int den, q, r;
@ -421,8 +437,12 @@ void OPPROTO op_divl_EAX_T0(void)
den = T0;
if (den == 0)
raise_exception(EXCP00_DIVZ);
#ifdef BUGGY_GCC_DIV64
r = div64(&q, num, den);
#else
q = (num / den);
r = (num % den);
#endif
EAX = q;
EDX = r;
}
@ -436,8 +456,12 @@ void OPPROTO op_idivl_EAX_T0(void)
den = T0;
if (den == 0)
raise_exception(EXCP00_DIVZ);
#ifdef BUGGY_GCC_DIV64
r = idiv64(&q, num, den);
#else
q = (num / den);
r = (num % den);
#endif
EAX = q;
EDX = r;
}
@ -1503,6 +1527,26 @@ extern CPU86_LDouble floor(CPU86_LDouble x);
extern CPU86_LDouble ceil(CPU86_LDouble x);
extern CPU86_LDouble rint(CPU86_LDouble x);
#if defined(__powerpc__)
extern CPU86_LDouble copysign(CPU86_LDouble, CPU86_LDouble);
/* correct (but slow) PowerPC rint() (glibc version is incorrect) */
double qemu_rint(double x)
{
double y = 4503599627370496.0;
if (fabs(x) >= y)
return x;
if (x < 0)
y = -y;
y = (x + y) - y;
if (y == 0.0)
y = copysign(y, x);
return y;
}
#define rint qemu_rint
#endif
#define RC_MASK 0xc00
#define RC_NEAR 0x000
#define RC_DOWN 0x400