Compiler-RT
================================
This directory and its subdirectories contain source code for the compiler
support routines.
Compiler-RT is open source software. You may freely distribute it under the
terms of the license agreement found in LICENSE.txt.
================================
This is a replacement library for libgcc. Each function is contained
in its own file. Each function has a corresponding unit test under
test/Unit.
A rudimentary script to test each file is in the file called
test/Unit/test.
Here is the specification for this library:
http://gcc.gnu.org/onlinedocs/gccint/Libgcc.html#Libgcc
Here is a synopsis of the contents of this library:
typedef int si_int;
typedef unsigned su_int;
typedef long long di_int;
typedef unsigned long long du_int;
// Integral bit manipulation
di_int __ashldi3(di_int a, si_int b); // a << b
ti_int __ashlti3(ti_int a, si_int b); // a << b
di_int __ashrdi3(di_int a, si_int b); // a >> b arithmetic (sign fill)
ti_int __ashrti3(ti_int a, si_int b); // a >> b arithmetic (sign fill)
di_int __lshrdi3(di_int a, si_int b); // a >> b logical (zero fill)
ti_int __lshrti3(ti_int a, si_int b); // a >> b logical (zero fill)
si_int __clzsi2(si_int a); // count leading zeros
si_int __clzdi2(di_int a); // count leading zeros
si_int __clzti2(ti_int a); // count leading zeros
si_int __ctzsi2(si_int a); // count trailing zeros
si_int __ctzdi2(di_int a); // count trailing zeros
si_int __ctzti2(ti_int a); // count trailing zeros
si_int __ffsdi2(di_int a); // find least significant 1 bit
si_int __ffsti2(ti_int a); // find least significant 1 bit
si_int __paritysi2(si_int a); // bit parity
si_int __paritydi2(di_int a); // bit parity
si_int __parityti2(ti_int a); // bit parity
si_int __popcountsi2(si_int a); // bit population
si_int __popcountdi2(di_int a); // bit population
si_int __popcountti2(ti_int a); // bit population
uint32_t __bswapsi2(uint32_t a); // a byteswapped, arm only
uint64_t __bswapdi2(uint64_t a); // a byteswapped, arm only
// Integral arithmetic
di_int __negdi2 (di_int a); // -a
ti_int __negti2 (ti_int a); // -a
di_int __muldi3 (di_int a, di_int b); // a * b
ti_int __multi3 (ti_int a, ti_int b); // a * b
si_int __divsi3 (si_int a, si_int b); // a / b signed
di_int __divdi3 (di_int a, di_int b); // a / b signed
ti_int __divti3 (ti_int a, ti_int b); // a / b signed
su_int __udivsi3 (su_int n, su_int d); // a / b unsigned
du_int __udivdi3 (du_int a, du_int b); // a / b unsigned
tu_int __udivti3 (tu_int a, tu_int b); // a / b unsigned
si_int __modsi3 (si_int a, si_int b); // a % b signed
di_int __moddi3 (di_int a, di_int b); // a % b signed
ti_int __modti3 (ti_int a, ti_int b); // a % b signed
su_int __umodsi3 (su_int a, su_int b); // a % b unsigned
du_int __umoddi3 (du_int a, du_int b); // a % b unsigned
tu_int __umodti3 (tu_int a, tu_int b); // a % b unsigned
du_int __udivmoddi4(du_int a, du_int b, du_int* rem); // a / b, *rem = a % b
tu_int __udivmodti4(tu_int a, tu_int b, tu_int* rem); // a / b, *rem = a % b
// Integral arithmetic with trapping overflow
si_int __absvsi2(si_int a); // abs(a)
di_int __absvdi2(di_int a); // abs(a)
ti_int __absvti2(ti_int a); // abs(a)
si_int __negvsi2(si_int a); // -a
di_int __negvdi2(di_int a); // -a
ti_int __negvti2(ti_int a); // -a
si_int __addvsi3(si_int a, si_int b); // a + b
di_int __addvdi3(di_int a, di_int b); // a + b
ti_int __addvti3(ti_int a, ti_int b); // a + b
si_int __subvsi3(si_int a, si_int b); // a - b
di_int __subvdi3(di_int a, di_int b); // a - b
ti_int __subvti3(ti_int a, ti_int b); // a - b
si_int __mulvsi3(si_int a, si_int b); // a * b
di_int __mulvdi3(di_int a, di_int b); // a * b
ti_int __mulvti3(ti_int a, ti_int b); // a * b
// Integral comparison: a < b -> 0
// a == b -> 1
// a > b -> 2
si_int __cmpdi2 (di_int a, di_int b);
si_int __cmpti2 (ti_int a, ti_int b);
si_int __ucmpdi2(du_int a, du_int b);
si_int __ucmpti2(tu_int a, tu_int b);
// Integral / floating point conversion
di_int __fixsfdi( float a);
di_int __fixdfdi( double a);
di_int __fixxfdi(long double a);
ti_int __fixsfti( float a);
ti_int __fixdfti( double a);
ti_int __fixxfti(long double a);
uint64_t __fixtfdi(long double input); // ppc only, doesn't match documentation
su_int __fixunssfsi( float a);
su_int __fixunsdfsi( double a);
su_int __fixunsxfsi(long double a);
du_int __fixunssfdi( float a);
du_int __fixunsdfdi( double a);
du_int __fixunsxfdi(long double a);
tu_int __fixunssfti( float a);
tu_int __fixunsdfti( double a);
tu_int __fixunsxfti(long double a);
uint64_t __fixunstfdi(long double input); // ppc only
float __floatdisf(di_int a);
double __floatdidf(di_int a);
long double __floatdixf(di_int a);
long double __floatditf(int64_t a); // ppc only
float __floattisf(ti_int a);
double __floattidf(ti_int a);
long double __floattixf(ti_int a);
float __floatundisf(du_int a);
double __floatundidf(du_int a);
long double __floatundixf(du_int a);
long double __floatunditf(uint64_t a); // ppc only
float __floatuntisf(tu_int a);
double __floatuntidf(tu_int a);
long double __floatuntixf(tu_int a);
// Floating point raised to integer power
float __powisf2( float a, si_int b); // a ^ b
double __powidf2( double a, si_int b); // a ^ b
long double __powixf2(long double a, si_int b); // a ^ b
long double __powitf2(long double a, si_int b); // ppc only, a ^ b
// Complex arithmetic
// (a + ib) * (c + id)
float _Complex __mulsc3( float a, float b, float c, float d);
double _Complex __muldc3(double a, double b, double c, double d);
long double _Complex __mulxc3(long double a, long double b,
long double c, long double d);
long double _Complex __multc3(long double a, long double b,
long double c, long double d); // ppc only
// (a + ib) / (c + id)
float _Complex __divsc3( float a, float b, float c, float d);
double _Complex __divdc3(double a, double b, double c, double d);
long double _Complex __divxc3(long double a, long double b,
long double c, long double d);
long double _Complex __divtc3(long double a, long double b,
long double c, long double d); // ppc only
// Undocumented functions
float __addsf3vfp(float a, float b); // arm only. Appears to return a + b
double __adddf3vfp(double a, double b); // arm only. Appears to return a + b
float __divsf3vfp(float a, float b); // arm only. Appears to return a / b
double __divdf3vfp(double a, double b); // arm only. Appears to return a / b
int __eqsf2vfp(float a, float b); // arm only. Appears to return one
// iff a == b and neither is NaN.
int __eqdf2vfp(double a, double b); // arm only. Appears to return one
// iff a == b and neither is NaN.
double __extendsfdf2vfp(float a); // arm only. Appears to convert from
// float to double.
int __fixdfsivfp(double a); // arm only. Appears to convert from
// double to int.
int __fixsfsivfp(float a); // arm only. Appears to convert from
// float to int.
unsigned int __fixunssfsivfp(float a); // arm only. Appears to convert from
// float to unsigned int.
unsigned int __fixunsdfsivfp(double a); // arm only. Appears to convert from
// double to unsigned int.
double __floatsidfvfp(int a); // arm only. Appears to convert from
// int to double.
float __floatsisfvfp(int a); // arm only. Appears to convert from
// int to float.
double __floatunssidfvfp(unsigned int a); // arm only. Appears to convert from
// unisgned int to double.
float __floatunssisfvfp(unsigned int a); // arm only. Appears to convert from
// unisgned int to float.
long double __gcc_qadd(long double x, long double y); // ppc only. Appears to
// return x + y.
long double __gcc_qdiv(long double a, long double b); // ppc only. Appears to
// return x / y.
long double __gcc_qmul(long double x, long double y); // ppc only. Appears to
// return x * y.
long double __gcc_qsub(long double x, long double y); // ppc only. Appears to
// return x - y.
int __gedf2vfp(double a, double b); // arm only. Appears to return __gedf2
// (a >= b)
int __gesf2vfp(float a, float b); // arm only. Appears to return __gesf2
// (a >= b)
int __gtdf2vfp(double a, double b); // arm only. Appears to return __gtdf2
// (a > b)
int __gtsf2vfp(float a, float b); // arm only. Appears to return __gtsf2
// (a > b)
int __ledf2vfp(double a, double b); // arm only. Appears to return __ledf2
// (a <= b)
int __lesf2vfp(float a, float b); // arm only. Appears to return __lesf2
// (a <= b)
int __ltdf2vfp(double a, double b); // arm only. Appears to return __ltdf2
// (a < b)
int __ltsf2vfp(float a, float b); // arm only. Appears to return __ltsf2
// (a < b)
double __muldf3vfp(double a, double b); // arm only. Appears to return a * b
float __mulsf3vfp(float a, float b); // arm only. Appears to return a * b
int __nedf2vfp(double a, double b); // arm only. Appears to return __nedf2
// (a != b)
double __negdf2vfp(double a); // arm only. Appears to return -a
float __negsf2vfp(float a); // arm only. Appears to return -a
float __negsf2vfp(float a); // arm only. Appears to return -a
double __subdf3vfp(double a, double b); // arm only. Appears to return a - b
float __subsf3vfp(float a, float b); // arm only. Appears to return a - b
float __truncdfsf2vfp(double a); // arm only. Appears to convert from
// double to float.
int __unorddf2vfp(double a, double b); // arm only. Appears to return
// __unorddf2
int __unordsf2vfp(float a, float b); // arm only. Appears to return
// __unordsf2
Preconditions are listed for each function at the definition when there are any.
Any preconditions reflect the specification at
http://gcc.gnu.org/onlinedocs/gccint/Libgcc.html#Libgcc.
Assumptions are listed in "int_lib.h", and in individual files. Where possible
assumptions are checked at compile time.
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