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Auto-generate some documentation

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This commit is contained in:
Justine Tunney 2020-12-26 02:09:07 -08:00
parent 117d0111ab
commit 13437dd19b
97 changed files with 2033 additions and 661 deletions
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2
libc/nexgen32e/ffs.S
View file

@ -38,8 +38,8 @@
/ @asyncsignalsafe
ffs: .leafprologue
.profilable
bsf %edi,%eax
or $-1,%edx
bsf %edi,%eax
cmovz %edx,%eax
inc %eax
.leafepilogue

24
libc/nexgen32e/ffs.h
View file

@ -3,9 +3,29 @@
#if !(__ASSEMBLER__ + __LINKER__ + 0)
COSMOPOLITAN_C_START_
/*
* BIT SCANNING 101
* ctz(𝑥) 31^clz(𝑥) clz(𝑥)
* uint32 𝑥 bsf(𝑥) tzcnt(𝑥) ffs(𝑥) bsr(𝑥) lzcnt(𝑥)
* 0x00000000 wut 32 0 wut 32
* 0x00000001 0 0 1 0 31
* 0x80000001 0 0 1 31 0
* 0x80000000 31 31 32 31 0
* 0x00000010 4 4 5 4 27
* 0x08000010 4 4 5 27 4
* 0x08000000 27 27 28 27 4
* 0xffffffff 0 0 1 31 0
*/
int ffs(int) pureconst;
int ffsl(long int) pureconst;
int ffsll(long long int) pureconst;
int ffsl(long) pureconst;
int ffsll(long long) pureconst;
#ifdef __GNUC__
#define ffs(u) __builtin_ffs(u)
#define ffsl(u) __builtin_ffsl(u)
#define ffsll(u) __builtin_ffsll(u)
#endif
COSMOPOLITAN_C_END_
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */

2
libc/nexgen32e/ffsl.S
View file

@ -38,8 +38,8 @@
/ @asyncsignalsafe
ffsl: .leafprologue
.profilable
bsf %rdi,%rax
or $-1,%edx
bsf %rdi,%rax
cmovz %edx,%eax
inc %eax
.leafepilogue

7
libc/nexgen32e/kcpuids.h
View file

@ -29,13 +29,6 @@
#if !(__ASSEMBLER__ + __LINKER__ + 0)
COSMOPOLITAN_C_START_
/**
* Globally precomputed x86 CPUID values.
*
* @note Referencing Is Initialization (RII)
* @note Protected with PIRO
* @see X86_HAVE()
*/
extern const unsigned kCpuids[KCPUIDS_LEN][4];
COSMOPOLITAN_C_END_