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cosmopolitan/libc/intrin/bsr.h

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Rename _bsr/_bsf to bsr/bsf Now that these functions are behind _COSMO_SOURCE there's no reason for having the ugly underscore anymore. To use these functions, you need to pass -mcosmo to cosmocc.
2024-03-05 01:33:26 +00:00
#ifdef _COSMO_SOURCE
Initial import
2020-06-15 14:18:57 +00:00
#ifndef COSMOPOLITAN_LIBC_NEXGEN32E_BSR_H_
#define COSMOPOLITAN_LIBC_NEXGEN32E_BSR_H_
COSMOPOLITAN_C_START_
Rename _bsr/_bsf to bsr/bsf Now that these functions are behind _COSMO_SOURCE there's no reason for having the ugly underscore anymore. To use these functions, you need to pass -mcosmo to cosmocc.
2024-03-05 01:33:26 +00:00
libcesque int bsr(int) pureconst;
libcesque int bsrl(long) pureconst;
libcesque int bsrll(long long) pureconst;
Add x86_64-linux-gnu emulator I wanted a tiny scriptable meltdown proof way to run userspace programs and visualize how program execution impacts memory. It helps to explain how things like Actually Portable Executable works. It can show you how the GCC generated code is going about manipulating matrices and more. I didn't feel fully comfortable with Qemu and Bochs because I'm not smart enough to understand them. I wanted something like gVisor but with much stronger levels of assurances. I wanted a single binary that'll run, on all major operating systems with an embedded GPL barrier ZIP filesystem that is tiny enough to transpile to JavaScript and run in browsers too. https://justine.storage.googleapis.com/emulator625.mp4
2020-08-25 11:23:25 +00:00
Make progress towards aarch64 build
2023-05-02 02:43:59 +00:00
#if defined(__GNUC__) && !defined(__STRICT_ANSI__)
Rename _bsr/_bsf to bsr/bsf Now that these functions are behind _COSMO_SOURCE there's no reason for having the ugly underscore anymore. To use these functions, you need to pass -mcosmo to cosmocc.
2024-03-05 01:33:26 +00:00
#define bsr(x) (__builtin_clz(x) ^ (sizeof(int) * 8 - 1))
#define bsrl(x) (__builtin_clzl(x) ^ (sizeof(long) * 8 - 1))
#define bsrll(x) (__builtin_clzll(x) ^ (sizeof(long long) * 8 - 1))
Make progress towards aarch64 build
2023-05-02 02:43:59 +00:00
#endif
Initial import
2020-06-15 14:18:57 +00:00
Add deprecated stubs for _bsf / _bsr
2024-03-05 17:45:51 +00:00
/* deprecated */
#define _bsr(x) bsr(x)
#define _bsrl(x) bsrl(x)
#define _bsrll(x) bsrll(x)
Initial import
2020-06-15 14:18:57 +00:00
COSMOPOLITAN_C_END_
#endif /* COSMOPOLITAN_LIBC_NEXGEN32E_BSR_H_ */
Rename _bsr/_bsf to bsr/bsf Now that these functions are behind _COSMO_SOURCE there's no reason for having the ugly underscore anymore. To use these functions, you need to pass -mcosmo to cosmocc.
2024-03-05 01:33:26 +00:00
#endif /* _COSMO_SOURCE */
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