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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 13:54:38 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 13:54:38 +0000 |
| commit | 8c1ab65c0f548d20b7f177bdb736daaf603340e1 (patch) | |
| tree | df55b7e75bf43f2bf500845b105afe3ac3a5157e /libc-top-half/musl/src/math/ilogbf.c | |
| parent | Initial commit. (diff) | |
| download | wasi-libc-8c1ab65c0f548d20b7f177bdb736daaf603340e1.tar.xz wasi-libc-8c1ab65c0f548d20b7f177bdb736daaf603340e1.zip | |
Adding upstream version 0.0~git20221206.8b7148f.upstream/0.0_git20221206.8b7148f
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'libc-top-half/musl/src/math/ilogbf.c')
| -rw-r--r-- | libc-top-half/musl/src/math/ilogbf.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/libc-top-half/musl/src/math/ilogbf.c b/libc-top-half/musl/src/math/ilogbf.c new file mode 100644 index 0000000..e23ba20 --- /dev/null +++ b/libc-top-half/musl/src/math/ilogbf.c @@ -0,0 +1,26 @@ +#include <limits.h> +#include "libm.h" + +int ilogbf(float x) +{ + #pragma STDC FENV_ACCESS ON + union {float f; uint32_t i;} u = {x}; + uint32_t i = u.i; + int e = i>>23 & 0xff; + + if (!e) { + i <<= 9; + if (i == 0) { + FORCE_EVAL(0/0.0f); + return FP_ILOGB0; + } + /* subnormal x */ + for (e = -0x7f; i>>31 == 0; e--, i<<=1); + return e; + } + if (e == 0xff) { + FORCE_EVAL(0/0.0f); + return i<<9 ? FP_ILOGBNAN : INT_MAX; + } + return e - 0x7f; +} |