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| author | Vladimir Azarov <avm@intermediate-node.net> | 2024-10-01 15:47:05 +0200 |
|---|---|---|
| committer | Vladimir Azarov <avm@intermediate-node.net> | 2024-10-01 15:47:05 +0200 |
| commit | 4abab5ad6c8465a7528ccdd5f49367da05f78bbd (patch) | |
| tree | ebf009bf1376a5a223a915bc27cbbd791a1316bc /src/math/trunc.c | |
Initial version
Diffstat (limited to 'src/math/trunc.c')
| -rw-r--r-- | src/math/trunc.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/src/math/trunc.c b/src/math/trunc.c new file mode 100644 index 0000000..d13711b --- /dev/null +++ b/src/math/trunc.c @@ -0,0 +1,19 @@ +#include "libm.h" + +double trunc(double x) +{ + union {double f; uint64_t i;} u = {x}; + int e = (int)(u.i >> 52 & 0x7ff) - 0x3ff + 12; + uint64_t m; + + if (e >= 52 + 12) + return x; + if (e < 12) + e = 1; + m = -1ULL >> e; + if ((u.i & m) == 0) + return x; + FORCE_EVAL(x + 0x1p120f); + u.i &= ~m; + return u.f; +} |