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 replacment 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 di_int __ashrdi3(di_int a, si_int b); // a >> b arithmetic (sign fill) di_int __lshrdi3(di_int a, si_int b); // a >> b logical (zero fill) si_int __clzsi2(si_int a); // count leading zeroes si_int __clzdi2(di_int a); // count leading zeroes si_int __ctzsi2(si_int a); // count trailing zeroes si_int __ctzdi2(di_int a); // count trailing zeroes si_int __ffsdi2(di_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 __popcountsi2(si_int a); // bit population si_int __popcountdi2(di_int a); // bit population // Integral arithmetic di_int __negdi2 (di_int a); // -a di_int __muldi3 (di_int a, di_int b); // a * b di_int __divdi3 (di_int a, di_int b); // a / b signed du_int __udivdi3 (du_int a, du_int b); // a / b unsigned di_int __moddi3 (di_int a, di_int b); // a % b signed du_int __umoddi3 (du_int a, du_int b); // a % b unsigned du_int __udivmoddi4(du_int a, du_int b, du_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) si_int __negvsi2(si_int a); // -a di_int __negvdi2(di_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 si_int __subvsi3(si_int a, si_int b); // a - b di_int __subvdi3(di_int a, di_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 // Integral comparison: a < b -> 0 // a == b -> 1 // a > b -> 2 si_int __cmpdi2 (di_int a, di_int b); si_int __ucmpdi2(du_int a, du_int b); // Integral / floating point conversion di_int __fixsfdi( float a); di_int __fixdfdi( double a); di_int __fixxfdi(long double a); 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); float __floatdisf(di_int a); double __floatdidf(di_int a); long double __floatdixf(di_int a); float __floatundisf(du_int a); double __floatundidf(du_int a); long double __floatundixf(du_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 // 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); // (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); 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.