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Introduce native support for MacOS ARM64

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There's a new program named ape/ape-m1.c which will be used to build an
embeddable binary that can load ape and elf executables. The support is
mostly working so far, but still chasing down ABI issues.
This commit is contained in:
Justine Tunney 2023-05-18 19:05:08 -07:00
parent b852650c08
commit 1422e96b4e
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GPG key ID: BE714B4575D6E328
757 changed files with 2988 additions and 1321 deletions
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11
libc/tinymath/magicu.c
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@ -17,6 +17,7 @@
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/tinymath/magicu.h"
#include "libc/assert.h"
/**
* Precomputes magic numbers for unsigned division by constant.
@ -27,7 +28,7 @@
* assert(77 / 7 == __magicu_div(77, __magicu_get(7)));
*
* @param d is intended divisor, which must not be zero
* @return magic divisor
* @return magic divisor (never zero)
*/
struct magicu __magicu_get(uint32_t d) {
// From Hacker's Delight by Henry S. Warren Jr., 9780321842688
@ -35,6 +36,7 @@ struct magicu __magicu_get(uint32_t d) {
int a, p;
struct magicu magu;
uint32_t p32, q, r, delta;
_npassert(d); // Can't divide by zero.
p32 = 0; // Avoid compiler warning.
a = 0; // Initialize "add" indicator.
p = 31; // Initialize p.
@ -58,8 +60,9 @@ struct magicu __magicu_get(uint32_t d) {
}
delta = d - 1 - r;
} while (p < 64 && p32 < delta);
magu.M = q + 1; // Magic number and
magu.s = p - 32; // Shift amount to return
if (a) magu.s |= 64; // Sets "add" indicator
magu.M = q + 1; // Magic number and
magu.s = p - 32; // Shift amount to return
if (a) magu.s |= 64; // Sets "add" indicator
_npassert(magu.M || magu.s); // Never returns zero.
return magu;
}