Get codebase completely working with LLVM

You can now build Cosmopolitan with Clang:

    make -j8 MODE=llvm
    o/llvm/examples/hello.com

The assembler and linker code is now friendly to LLVM too.
So it's not needed to configure Clang to use binutils under
the hood. If you love LLVM then you can now use pure LLVM.
This commit is contained in:
Justine Tunney 2021-02-08 09:19:00 -08:00
parent 0e36cb3ac4
commit e75ffde09e
4528 changed files with 7776 additions and 11640 deletions

View file

@ -18,21 +18,21 @@
*/
#include "libc/macros.h"
/ Returns binary logarithm of integer 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
/
/ @param rsi:rdi is 128-bit unsigned 𝑥 value
/ @return eax number in range [0,128) or undef if 𝑥 is 0
/ @see also treasure trove of nearly identical functions
// Returns binary logarithm of integer 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
//
// @param rsi:rdi is 128-bit unsigned 𝑥 value
// @return eax number in range [0,128) or undef if 𝑥 is 0
// @see also treasure trove of nearly identical functions
bsrmax: .leafprologue
.profilable
bsr %rsi,%rax