0ece074de9
This version of libcompiler_rt adds support for __mulo[sdt]i4(), which computes a multiply and its overflow flag. There are also a lot of cleanup fixes to headers that don't really affect us. Updating to this revision should make it a bit easier to contribute changes back to the LLVM developers.
344 lines
14 KiB
Plaintext
344 lines
14 KiB
Plaintext
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 unsigned
|
|
tu_int __udivmodti4(tu_int a, tu_int b, tu_int* rem); // a / b, *rem = a % b unsigned
|
|
su_int __udivmodsi4(su_int a, su_int b, su_int* rem); // a / b, *rem = a % b unsigned
|
|
si_int __divmodsi4(si_int a, si_int b, si_int* rem); // a / b, *rem = a % b signed
|
|
|
|
|
|
|
|
// 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 arithmetic which returns if overflow
|
|
|
|
si_int __mulosi4(si_int a, si_int b, int* overflow); // a * b, overflow set to one if result not in signed range
|
|
di_int __mulodi4(di_int a, di_int b, int* overflow); // a * b, overflow set to one if result not in signed range
|
|
ti_int __muloti4(ti_int a, ti_int b, int* overflow); // a * b, overflow set to
|
|
one if result not in signed range
|
|
|
|
|
|
// 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
|
|
|
|
|
|
// Runtime support
|
|
|
|
// __clear_cache() is used to tell process that new instructions have been
|
|
// written to an address range. Necessary on processors that do not have
|
|
// a unified instuction and data cache.
|
|
void __clear_cache(void* start, void* end);
|
|
|
|
// __enable_execute_stack() is used with nested functions when a trampoline
|
|
// function is written onto the stack and that page range needs to be made
|
|
// executable.
|
|
void __enable_execute_stack(void* addr);
|
|
|
|
// __gcc_personality_v0() is normally only called by the system unwinder.
|
|
// C code (as opposed to C++) normally does not need a personality function
|
|
// because there are no catch clauses or destructors to be run. But there
|
|
// is a C language extension __attribute__((cleanup(func))) which marks local
|
|
// variables as needing the cleanup function "func" to be run when the
|
|
// variable goes out of scope. That includes when an exception is thrown,
|
|
// so a personality handler is needed.
|
|
_Unwind_Reason_Code __gcc_personality_v0(int version, _Unwind_Action actions,
|
|
uint64_t exceptionClass, struct _Unwind_Exception* exceptionObject,
|
|
_Unwind_Context_t context);
|
|
|
|
// for use with some implementations of assert() in <assert.h>
|
|
void __eprintf(const char* format, const char* assertion_expression,
|
|
const char* line, const char* file);
|
|
|
|
|
|
|
|
// Power PC specific functions
|
|
|
|
// There is no C interface to the saveFP/restFP functions. They are helper
|
|
// functions called by the prolog and epilog of functions that need to save
|
|
// a number of non-volatile float point registers.
|
|
saveFP
|
|
restFP
|
|
|
|
// PowerPC has a standard template for trampoline functions. This function
|
|
// generates a custom trampoline function with the specific realFunc
|
|
// and localsPtr values.
|
|
void __trampoline_setup(uint32_t* trampOnStack, int trampSizeAllocated,
|
|
const void* realFunc, void* localsPtr);
|
|
|
|
// adds two 128-bit double-double precision values ( x + y )
|
|
long double __gcc_qadd(long double x, long double y);
|
|
|
|
// subtracts two 128-bit double-double precision values ( x - y )
|
|
long double __gcc_qsub(long double x, long double y);
|
|
|
|
// multiples two 128-bit double-double precision values ( x * y )
|
|
long double __gcc_qmul(long double x, long double y);
|
|
|
|
// divides two 128-bit double-double precision values ( x / y )
|
|
long double __gcc_qdiv(long double a, long double b);
|
|
|
|
|
|
// ARM specific functions
|
|
|
|
// There is no C interface to the switch* functions. These helper functions
|
|
// are only needed by Thumb1 code for efficient switch table generation.
|
|
switch16
|
|
switch32
|
|
switch8
|
|
switchu8
|
|
|
|
// There is no C interface to the *_vfp_d8_d15_regs functions. There are
|
|
// called in the prolog and epilog of Thumb1 functions. When the C++ ABI use
|
|
// SJLJ for exceptions, each function with a catch clause or destuctors needs
|
|
// to save and restore all registers in it prolog and epliog. But there is
|
|
// no way to access vector and high float registers from thumb1 code, so the
|
|
// compiler must add call outs to these helper functions in the prolog and
|
|
// epilog.
|
|
restore_vfp_d8_d15_regs
|
|
save_vfp_d8_d15_regs
|
|
|
|
|
|
// Note: long ago ARM processors did not have floating point hardware support.
|
|
// Floating point was done in software and floating point parameters were
|
|
// passed in integer registers. When hardware support was added for floating
|
|
// point, new *vfp functions were added to do the same operations but with
|
|
// floating point parameters in floating point registers.
|
|
|
|
// Undocumented functions
|
|
|
|
float __addsf3vfp(float a, float b); // Appears to return a + b
|
|
double __adddf3vfp(double a, double b); // Appears to return a + b
|
|
float __divsf3vfp(float a, float b); // Appears to return a / b
|
|
double __divdf3vfp(double a, double b); // Appears to return a / b
|
|
int __eqsf2vfp(float a, float b); // Appears to return one
|
|
// iff a == b and neither is NaN.
|
|
int __eqdf2vfp(double a, double b); // Appears to return one
|
|
// iff a == b and neither is NaN.
|
|
double __extendsfdf2vfp(float a); // Appears to convert from
|
|
// float to double.
|
|
int __fixdfsivfp(double a); // Appears to convert from
|
|
// double to int.
|
|
int __fixsfsivfp(float a); // Appears to convert from
|
|
// float to int.
|
|
unsigned int __fixunssfsivfp(float a); // Appears to convert from
|
|
// float to unsigned int.
|
|
unsigned int __fixunsdfsivfp(double a); // Appears to convert from
|
|
// double to unsigned int.
|
|
double __floatsidfvfp(int a); // Appears to convert from
|
|
// int to double.
|
|
float __floatsisfvfp(int a); // Appears to convert from
|
|
// int to float.
|
|
double __floatunssidfvfp(unsigned int a); // Appears to convert from
|
|
// unisgned int to double.
|
|
float __floatunssisfvfp(unsigned int a); // Appears to convert from
|
|
// unisgned int to float.
|
|
int __gedf2vfp(double a, double b); // Appears to return __gedf2
|
|
// (a >= b)
|
|
int __gesf2vfp(float a, float b); // Appears to return __gesf2
|
|
// (a >= b)
|
|
int __gtdf2vfp(double a, double b); // Appears to return __gtdf2
|
|
// (a > b)
|
|
int __gtsf2vfp(float a, float b); // Appears to return __gtsf2
|
|
// (a > b)
|
|
int __ledf2vfp(double a, double b); // Appears to return __ledf2
|
|
// (a <= b)
|
|
int __lesf2vfp(float a, float b); // Appears to return __lesf2
|
|
// (a <= b)
|
|
int __ltdf2vfp(double a, double b); // Appears to return __ltdf2
|
|
// (a < b)
|
|
int __ltsf2vfp(float a, float b); // Appears to return __ltsf2
|
|
// (a < b)
|
|
double __muldf3vfp(double a, double b); // Appears to return a * b
|
|
float __mulsf3vfp(float a, float b); // Appears to return a * b
|
|
int __nedf2vfp(double a, double b); // Appears to return __nedf2
|
|
// (a != b)
|
|
double __negdf2vfp(double a); // Appears to return -a
|
|
float __negsf2vfp(float a); // Appears to return -a
|
|
float __negsf2vfp(float a); // Appears to return -a
|
|
double __subdf3vfp(double a, double b); // Appears to return a - b
|
|
float __subsf3vfp(float a, float b); // Appears to return a - b
|
|
float __truncdfsf2vfp(double a); // Appears to convert from
|
|
// double to float.
|
|
int __unorddf2vfp(double a, double b); // Appears to return __unorddf2
|
|
int __unordsf2vfp(float a, float b); // 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.
|