Commit 159568a05a222681f54a27310ac15c3043563f95 | zig

author	mihael <hi@mihaelm.com> 2026-03-10 00:09:00+01:00
committer	mihael <hi@mihaelm.com> 2026-03-10 00:42:32+01:00
log	159568a05a222681f54a27310ac15c3043563f95
tree	4d173c445efc90f343f80b0712cfa939c495e9ef
parent	1f92162875a3f05942dad6696b206cb9a1394f80
signature	Signed by SSH key SHA256:aoFoShdYLdrqMichqKXSSieTKUfACUIDJHsKc4V2tQg

Reimplement `coshf` in `libzigc`

The function basically calls the Zig std's implementation.

The changes were tested by running:

```
$ ./build/stage3/bin/zig build -p stage4 -Denable-llvm -Dno-lib

$ stage4/bin/zig build test-libc -Dlibc-test-path=<LIBC-TEST-PATH> -Dtest-filter=coshf -fqemu -fwasmtime --summary line
Build Summary: 553/553 steps succeeded
```

7 files changed, 5 insertions(+), 83 deletions(-)

lib
- c
  - math.zig
- libc
  - mingw
    math
    coshf.c
  - musl
    src
    math
    coshf.c
  - wasi
    libc-top-half
    musl
    src
    math
    coshf.c
src
- libs

lib/c/math.zig+5

...	...	@@ -31,6 +31,7 @@ comptime {
31	31	}
32	32
33	33	if (builtin.target.isMinGW() or builtin.target.isMuslLibC() or builtin.target.isWasiLibC()) {
	34	symbol(&coshf, "coshf");
34	35	symbol(&hypotf, "hypotf");
35	36	symbol(&hypotl, "hypotl");
36	37	symbol(&nan, "nan");
...	...	@@ -130,6 +131,10 @@ fn cosh(x: f64) callconv(.c) f64 {
130	131	return math.cosh(x);
131	132	}
132	133
	134	fn coshf(x: f32) callconv(.c) f32 {
	135	return math.cosh(x);
	136	}
	137
133	138	fn cbrt(x: f64) callconv(.c) f64 {
134	139	return math.cbrt(x);
135	140	}

lib/libc/mingw/math/coshf.c deleted-10

...	...	@@ -1,10 +0,0 @@
1		/**
2		* This file has no copyright assigned and is placed in the Public Domain.
3		* This file is part of the mingw-w64 runtime package.
4		* No warranty is given; refer to the file DISCLAIMER.PD within this package.
5		*/
6		#include <math.h>
7		float coshf (float x)
8		{
9		return (float) cosh (x);
10		}

lib/libc/musl/src/math/coshf.c deleted-33

...	...	@@ -1,33 +0,0 @@
1		#include "libm.h"
2
3		float coshf(float x)
4		{
5		union {float f; uint32_t i;} u = {.f = x};
6		uint32_t w;
7		float t;
8
9		/* \|x\| */
10		u.i &= 0x7fffffff;
11		x = u.f;
12		w = u.i;
13
14		/* \|x\| < log(2) */
15		if (w < 0x3f317217) {
16		if (w < 0x3f800000 - (12<<23)) {
17		FORCE_EVAL(x + 0x1p120f);
18		return 1;
19		}
20		t = expm1f(x);
21		return 1 + tt/(2(1+t));
22		}
23
24		/* \|x\| < log(FLT_MAX) */
25		if (w < 0x42b17217) {
26		t = expf(x);
27		return 0.5f*(t + 1/t);
28		}
29
30		/* \|x\| > log(FLT_MAX) or nan */
31		t = __expo2f(x, 1.0f);
32		return t;
33		}

lib/libc/wasi/libc-top-half/musl/src/math/coshf.c deleted-37

...	...	@@ -1,37 +0,0 @@
1		#include "libm.h"
2
3		float coshf(float x)
4		{
5		union {float f; uint32_t i;} u = {.f = x};
6		uint32_t w;
7		float t;
8
9		/* \|x\| */
10		u.i &= 0x7fffffff;
11		x = u.f;
12		w = u.i;
13
14		/* \|x\| < log(2) */
15		if (w < 0x3f317217) {
16		if (w < 0x3f800000 - (12<<23)) {
17		FORCE_EVAL(x + 0x1p120f);
18		return 1;
19		}
20		t = expm1f(x);
21		return 1 + tt/(2(1+t));
22		}
23
24		/* \|x\| < log(FLT_MAX) */
25		if (w < 0x42b17217) {
26		t = expf(x);
27		return 0.5f*(t + 1/t);
28		}
29
30		/* \|x\| > log(FLT_MAX) or nan */
31		#ifdef __wasilibc_unmodified_upstream // Wasm doesn't have alternate rounding modes
32		t = __expo2f(x, 1.0f);
33		#else
34		t = __expo2f(x);
35		#endif
36		return t;
37		}

src/libs/mingw.zig-1

...	...	@@ -977,7 +977,6 @@ const mingw32_x86_src = [_][]const u8{
977	977
978	978	const mingw32_x86_32_src = [_][]const u8{
979	979	// ucrtbase
980		"math" ++ path.sep_str ++ "coshf.c",
981	980	"math" ++ path.sep_str ++ "modff.c",
982	981	"math" ++ path.sep_str ++ "powf.c",
983	982	"math" ++ path.sep_str ++ "sinhf.c",

src/libs/musl.zig-1

...	...	@@ -819,7 +819,6 @@ const src_files = [_][]const u8{
819	819	"musl/src/math/cbrtl.c",
820	820	"musl/src/math/__cos.c",
821	821	"musl/src/math/__cosdf.c",
822		"musl/src/math/coshf.c",
823	822	"musl/src/math/coshl.c",
824	823	"musl/src/math/__cosl.c",
825	824	"musl/src/math/cosl.c",

src/libs/wasi_libc.zig-1

...	...	@@ -1003,7 +1003,6 @@ const libc_top_half_src_files = [_][]const u8{
1003	1003	"wasi/libc-top-half/musl/src/locale/locale_map.c",
1004	1004	"wasi/libc-top-half/musl/src/locale/newlocale.c",
1005	1005	"wasi/libc-top-half/musl/src/locale/uselocale.c",
1006		"wasi/libc-top-half/musl/src/math/coshf.c",
1007	1006	"wasi/libc-top-half/musl/src/math/__expo2.c",
1008	1007	"wasi/libc-top-half/musl/src/math/__expo2f.c",
1009	1008	"wasi/libc-top-half/musl/src/math/fmal.c",