7686ff743c
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
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================================
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This directory and its subdirectories contain source code for the compiler
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support routines.
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Compiler-RT is open source software. You may freely distribute it under the
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terms of the license agreement found in LICENSE.txt.
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================================
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This is a replacement library for libgcc. Each function is contained
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in its own file. Each function has a corresponding unit test under
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test/Unit.
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A rudimentary script to test each file is in the file called
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test/Unit/test.
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Here is the specification for this library:
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http://gcc.gnu.org/onlinedocs/gccint/Libgcc.html#Libgcc
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Here is a synopsis of the contents of this library:
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typedef int si_int;
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typedef unsigned su_int;
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typedef long long di_int;
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typedef unsigned long long du_int;
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// Integral bit manipulation
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di_int __ashldi3(di_int a, si_int b); // a << b
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ti_int __ashlti3(ti_int a, si_int b); // a << b
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di_int __ashrdi3(di_int a, si_int b); // a >> b arithmetic (sign fill)
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ti_int __ashrti3(ti_int a, si_int b); // a >> b arithmetic (sign fill)
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di_int __lshrdi3(di_int a, si_int b); // a >> b logical (zero fill)
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ti_int __lshrti3(ti_int a, si_int b); // a >> b logical (zero fill)
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si_int __clzsi2(si_int a); // count leading zeros
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si_int __clzdi2(di_int a); // count leading zeros
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si_int __clzti2(ti_int a); // count leading zeros
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si_int __ctzsi2(si_int a); // count trailing zeros
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si_int __ctzdi2(di_int a); // count trailing zeros
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si_int __ctzti2(ti_int a); // count trailing zeros
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si_int __ffsdi2(di_int a); // find least significant 1 bit
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si_int __ffsti2(ti_int a); // find least significant 1 bit
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si_int __paritysi2(si_int a); // bit parity
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si_int __paritydi2(di_int a); // bit parity
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si_int __parityti2(ti_int a); // bit parity
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si_int __popcountsi2(si_int a); // bit population
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si_int __popcountdi2(di_int a); // bit population
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si_int __popcountti2(ti_int a); // bit population
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uint32_t __bswapsi2(uint32_t a); // a byteswapped, arm only
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uint64_t __bswapdi2(uint64_t a); // a byteswapped, arm only
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// Integral arithmetic
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di_int __negdi2 (di_int a); // -a
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ti_int __negti2 (ti_int a); // -a
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di_int __muldi3 (di_int a, di_int b); // a * b
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ti_int __multi3 (ti_int a, ti_int b); // a * b
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si_int __divsi3 (si_int a, si_int b); // a / b signed
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di_int __divdi3 (di_int a, di_int b); // a / b signed
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ti_int __divti3 (ti_int a, ti_int b); // a / b signed
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su_int __udivsi3 (su_int n, su_int d); // a / b unsigned
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du_int __udivdi3 (du_int a, du_int b); // a / b unsigned
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tu_int __udivti3 (tu_int a, tu_int b); // a / b unsigned
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si_int __modsi3 (si_int a, si_int b); // a % b signed
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di_int __moddi3 (di_int a, di_int b); // a % b signed
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ti_int __modti3 (ti_int a, ti_int b); // a % b signed
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su_int __umodsi3 (su_int a, su_int b); // a % b unsigned
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du_int __umoddi3 (du_int a, du_int b); // a % b unsigned
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tu_int __umodti3 (tu_int a, tu_int b); // a % b unsigned
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du_int __udivmoddi4(du_int a, du_int b, du_int* rem); // a / b, *rem = a % b unsigned
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tu_int __udivmodti4(tu_int a, tu_int b, tu_int* rem); // a / b, *rem = a % b unsigned
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su_int __udivmodsi4(su_int a, su_int b, su_int* rem); // a / b, *rem = a % b unsigned
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si_int __divmodsi4(si_int a, si_int b, si_int* rem); // a / b, *rem = a % b signed
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// Integral arithmetic with trapping overflow
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si_int __absvsi2(si_int a); // abs(a)
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di_int __absvdi2(di_int a); // abs(a)
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ti_int __absvti2(ti_int a); // abs(a)
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si_int __negvsi2(si_int a); // -a
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di_int __negvdi2(di_int a); // -a
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ti_int __negvti2(ti_int a); // -a
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si_int __addvsi3(si_int a, si_int b); // a + b
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di_int __addvdi3(di_int a, di_int b); // a + b
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ti_int __addvti3(ti_int a, ti_int b); // a + b
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si_int __subvsi3(si_int a, si_int b); // a - b
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di_int __subvdi3(di_int a, di_int b); // a - b
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ti_int __subvti3(ti_int a, ti_int b); // a - b
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si_int __mulvsi3(si_int a, si_int b); // a * b
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di_int __mulvdi3(di_int a, di_int b); // a * b
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ti_int __mulvti3(ti_int a, ti_int b); // a * b
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// Integral arithmetic which returns if overflow
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si_int __mulosi4(si_int a, si_int b, int* overflow); // a * b, overflow set to one if result not in signed range
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di_int __mulodi4(di_int a, di_int b, int* overflow); // a * b, overflow set to one if result not in signed range
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ti_int __muloti4(ti_int a, ti_int b, int* overflow); // a * b, overflow set to
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one if result not in signed range
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// Integral comparison: a < b -> 0
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// a == b -> 1
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// a > b -> 2
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si_int __cmpdi2 (di_int a, di_int b);
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si_int __cmpti2 (ti_int a, ti_int b);
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si_int __ucmpdi2(du_int a, du_int b);
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si_int __ucmpti2(tu_int a, tu_int b);
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// Integral / floating point conversion
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di_int __fixsfdi( float a);
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di_int __fixdfdi( double a);
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di_int __fixxfdi(long double a);
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ti_int __fixsfti( float a);
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ti_int __fixdfti( double a);
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ti_int __fixxfti(long double a);
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uint64_t __fixtfdi(long double input); // ppc only, doesn't match documentation
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su_int __fixunssfsi( float a);
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su_int __fixunsdfsi( double a);
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su_int __fixunsxfsi(long double a);
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du_int __fixunssfdi( float a);
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du_int __fixunsdfdi( double a);
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du_int __fixunsxfdi(long double a);
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tu_int __fixunssfti( float a);
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tu_int __fixunsdfti( double a);
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tu_int __fixunsxfti(long double a);
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uint64_t __fixunstfdi(long double input); // ppc only
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float __floatdisf(di_int a);
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double __floatdidf(di_int a);
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long double __floatdixf(di_int a);
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long double __floatditf(int64_t a); // ppc only
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float __floattisf(ti_int a);
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double __floattidf(ti_int a);
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long double __floattixf(ti_int a);
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float __floatundisf(du_int a);
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double __floatundidf(du_int a);
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long double __floatundixf(du_int a);
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long double __floatunditf(uint64_t a); // ppc only
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float __floatuntisf(tu_int a);
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double __floatuntidf(tu_int a);
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long double __floatuntixf(tu_int a);
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// Floating point raised to integer power
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float __powisf2( float a, si_int b); // a ^ b
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double __powidf2( double a, si_int b); // a ^ b
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long double __powixf2(long double a, si_int b); // a ^ b
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long double __powitf2(long double a, si_int b); // ppc only, a ^ b
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// Complex arithmetic
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// (a + ib) * (c + id)
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float _Complex __mulsc3( float a, float b, float c, float d);
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double _Complex __muldc3(double a, double b, double c, double d);
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long double _Complex __mulxc3(long double a, long double b,
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long double c, long double d);
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long double _Complex __multc3(long double a, long double b,
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long double c, long double d); // ppc only
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// (a + ib) / (c + id)
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float _Complex __divsc3( float a, float b, float c, float d);
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double _Complex __divdc3(double a, double b, double c, double d);
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long double _Complex __divxc3(long double a, long double b,
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long double c, long double d);
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long double _Complex __divtc3(long double a, long double b,
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long double c, long double d); // ppc only
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// Runtime support
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// __clear_cache() is used to tell process that new instructions have been
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// written to an address range. Necessary on processors that do not have
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// a unified instuction and data cache.
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void __clear_cache(void* start, void* end);
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// __enable_execute_stack() is used with nested functions when a trampoline
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// function is written onto the stack and that page range needs to be made
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// executable.
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void __enable_execute_stack(void* addr);
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// __gcc_personality_v0() is normally only called by the system unwinder.
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// C code (as opposed to C++) normally does not need a personality function
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// because there are no catch clauses or destructors to be run. But there
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// is a C language extension __attribute__((cleanup(func))) which marks local
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// variables as needing the cleanup function "func" to be run when the
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// variable goes out of scope. That includes when an exception is thrown,
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// so a personality handler is needed.
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_Unwind_Reason_Code __gcc_personality_v0(int version, _Unwind_Action actions,
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uint64_t exceptionClass, struct _Unwind_Exception* exceptionObject,
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_Unwind_Context_t context);
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// for use with some implementations of assert() in <assert.h>
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void __eprintf(const char* format, const char* assertion_expression,
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const char* line, const char* file);
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// Power PC specific functions
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// There is no C interface to the saveFP/restFP functions. They are helper
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// functions called by the prolog and epilog of functions that need to save
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// a number of non-volatile float point registers.
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saveFP
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restFP
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// PowerPC has a standard template for trampoline functions. This function
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// generates a custom trampoline function with the specific realFunc
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// and localsPtr values.
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void __trampoline_setup(uint32_t* trampOnStack, int trampSizeAllocated,
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const void* realFunc, void* localsPtr);
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// adds two 128-bit double-double precision values ( x + y )
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long double __gcc_qadd(long double x, long double y);
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// subtracts two 128-bit double-double precision values ( x - y )
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long double __gcc_qsub(long double x, long double y);
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// multiples two 128-bit double-double precision values ( x * y )
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long double __gcc_qmul(long double x, long double y);
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// divides two 128-bit double-double precision values ( x / y )
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long double __gcc_qdiv(long double a, long double b);
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// ARM specific functions
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// There is no C interface to the switch* functions. These helper functions
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// are only needed by Thumb1 code for efficient switch table generation.
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switch16
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switch32
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switch8
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switchu8
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// There is no C interface to the *_vfp_d8_d15_regs functions. There are
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// called in the prolog and epilog of Thumb1 functions. When the C++ ABI use
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// SJLJ for exceptions, each function with a catch clause or destuctors needs
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// to save and restore all registers in it prolog and epliog. But there is
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// no way to access vector and high float registers from thumb1 code, so the
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// compiler must add call outs to these helper functions in the prolog and
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// epilog.
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restore_vfp_d8_d15_regs
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save_vfp_d8_d15_regs
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// Note: long ago ARM processors did not have floating point hardware support.
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// Floating point was done in software and floating point parameters were
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// passed in integer registers. When hardware support was added for floating
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// point, new *vfp functions were added to do the same operations but with
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// floating point parameters in floating point registers.
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// Undocumented functions
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float __addsf3vfp(float a, float b); // Appears to return a + b
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double __adddf3vfp(double a, double b); // Appears to return a + b
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float __divsf3vfp(float a, float b); // Appears to return a / b
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double __divdf3vfp(double a, double b); // Appears to return a / b
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int __eqsf2vfp(float a, float b); // Appears to return one
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// iff a == b and neither is NaN.
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int __eqdf2vfp(double a, double b); // Appears to return one
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// iff a == b and neither is NaN.
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double __extendsfdf2vfp(float a); // Appears to convert from
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// float to double.
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int __fixdfsivfp(double a); // Appears to convert from
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// double to int.
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int __fixsfsivfp(float a); // Appears to convert from
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// float to int.
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unsigned int __fixunssfsivfp(float a); // Appears to convert from
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// float to unsigned int.
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unsigned int __fixunsdfsivfp(double a); // Appears to convert from
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// double to unsigned int.
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double __floatsidfvfp(int a); // Appears to convert from
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// int to double.
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float __floatsisfvfp(int a); // Appears to convert from
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// int to float.
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double __floatunssidfvfp(unsigned int a); // Appears to convert from
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// unisgned int to double.
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float __floatunssisfvfp(unsigned int a); // Appears to convert from
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// unisgned int to float.
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int __gedf2vfp(double a, double b); // Appears to return __gedf2
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// (a >= b)
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int __gesf2vfp(float a, float b); // Appears to return __gesf2
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// (a >= b)
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int __gtdf2vfp(double a, double b); // Appears to return __gtdf2
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// (a > b)
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int __gtsf2vfp(float a, float b); // Appears to return __gtsf2
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// (a > b)
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int __ledf2vfp(double a, double b); // Appears to return __ledf2
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// (a <= b)
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int __lesf2vfp(float a, float b); // Appears to return __lesf2
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// (a <= b)
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int __ltdf2vfp(double a, double b); // Appears to return __ltdf2
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// (a < b)
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int __ltsf2vfp(float a, float b); // Appears to return __ltsf2
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// (a < b)
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double __muldf3vfp(double a, double b); // Appears to return a * b
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float __mulsf3vfp(float a, float b); // Appears to return a * b
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int __nedf2vfp(double a, double b); // Appears to return __nedf2
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// (a != b)
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double __negdf2vfp(double a); // Appears to return -a
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float __negsf2vfp(float a); // Appears to return -a
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float __negsf2vfp(float a); // Appears to return -a
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double __subdf3vfp(double a, double b); // Appears to return a - b
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float __subsf3vfp(float a, float b); // Appears to return a - b
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float __truncdfsf2vfp(double a); // Appears to convert from
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// double to float.
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int __unorddf2vfp(double a, double b); // Appears to return __unorddf2
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int __unordsf2vfp(float a, float b); // Appears to return __unordsf2
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Preconditions are listed for each function at the definition when there are any.
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Any preconditions reflect the specification at
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http://gcc.gnu.org/onlinedocs/gccint/Libgcc.html#Libgcc.
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Assumptions are listed in "int_lib.h", and in individual files. Where possible
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assumptions are checked at compile time.
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