Prototype  Description 

int __assert1(int, int, int);  Generates trap instructions for kernel debugging. 
void __assert2(int);  Generates trap instructions for kernel debugging. 
unsigned int __cntlz4(unsigned int);  Count Leading Zeros, 4Byte Integer 
unsigned int __cntlz8(unsigned long long);  Count Leading Zeros, 8Byte Integer 
unsigned int __cnttz4(unsigned int);  Count Trailing Zeros, 4Byte Integer 
unsigned int __cnttz8(unsigned long long);  Count Trailing Zeros, 8Byte Integer 
struct __div_t __div (signed int, signed int);  Divide the value passed to the first argument by the value contained in the second argument and return a div_t structure containing both the quotient, and the remainder of the division as two separate values. 
struct __ldiv_t __ldiv (signed long, signed long);  Compute quotient and remainder for long integer division 
signed long long __llabs (signed long long);  Return long long absolute value of the argument 
unsigned short __load2r(unsigned short*);  Load halfword byte reversed 
unsigned int __load4r(unsigned int*);  Load word byte reversed 
long long int __mulhd(long long int ra, long long int rb);  Multiply High Doubleword Signed.
Returns the highorder 64 bits of the 128bit product of the operands ra and rb. 
unsigned long long int __mulhdu(unsigned long long int ra, unsigned long long int rb);  Multiply High Doubleword Unsigned.
Returns the highorder 64 bits of the 128bit product of the operands ra and rb. 
int __mulhw(int ra, int rb);  Multiply High Word Signed.
Returns the highorder 32 bits of the 64bit product of the operands ra and rb. 
unsigned int __mulhwu(unsigned int ra, unsigned int rb);  Multiply High Word Unsigned.
Returns the highorder 32 bits of the 64bit product of the operands ra and rb. 
int __popcnt4(unsigned int);  Returns the number of bits set for a 32bit integer. 
int __popcnt8(unsigned long long);  Returns the number of bits set for a 64bit integer. 
unsigned long __popcntb(unsigned long);  Counts the 1 bits in each byte of the source operand
and places that count into the corresponding byte of the result.
(POWER5 processors only) 
int __poppar4(unsigned int);  Returns 1 if there is an odd number of bits set in a 32bit integer. Returns 0 otherwise. 
int __poppar8(unsigned long long);  Returns 1 if there is an odd number of bits set in a 64bit integer. Returns 0 otherwise. 
unsigned long long __rdlam(unsigned long long rs, unsigned int shift, unsigned long long mask);  Rotate Double Left and AND with Mask.
The contents of rs are rotated left shift bits. The rotated data is ANDed with the mask and returned as a result. mask must be a constant and represent a contiguous bit field. 
unsigned long long __rldimi(unsigned long long rs, unsigned long long is, unsigned int shift, unsigned long long mask);  Rotate Left Doubleword Immediate then Mask Insert.
Rotates rs left shift bits then inserts rs into is under bit mask mask. Shift must be a constant and 0<=shift<=63. mask must be a constant and represent a contiguous bit field. 
unsigned int __rlwimi(unsigned int rs, unsigned int is, unsigned int shift, unsigned int mask);  Rotate Left Word Immidiate then Mask Insert.
Rotates rs left shift bits then inserts rs into is under bit mask mask. Shift must be a constant and 0<=shift<=31. mask must be a constant and represent a contiguous bit field. 
unsigned int __rlwnm(unsigned int rs, unsigned int shift, unsigned int mask);  Rotate Left Word then AND with Mask.
Rotates rs left shift bits, then ANDs rs with bit mask mask. mask must be a constant and represent a contiguous bit field. 
unsigned int __rotatel4(unsigned int rs, unsigned int shift);  Rotate Left Word.
Rotates rs left shift bits. 
unsigned long long __rotatel8(unsigned long long rs, unsigned long long shift);  Rotate Left Doubleword.
Rotates rs left shift bits. 
void __store2r(unsigned short, unsigned short *);  Store 2byte register 
void __store4r(unsigned int, unsigned int *);  Store 4byte register 
void __tdw(long long a, long long b, unsigned int TO);  Trap Doubleword.
Operand a is compared with operand b. This comparison results in five conditions which are ANDed with a 5bit constant TO containing a value of 0 to 31 inclusive. If the result is not 0 the system trap handler is invoked. Each bit positon, if set, indicates one or more of the following possible conditions:

void __trap(int);  Trap 
void __trapd (longlong);  Trap if the parameter is not zero. 
void __tw(int a, int b, unsigned int TO);  Trap Word.
Operand a is compared with operand b. This comparison results in five conditions which are ANDed with a 5bit constant TO containing a value of 0 to 31 inclusive. If the result is not 0 the system trap handler is invoked. Each bit positon, if set, indicates one or more of the following possible conditions:
