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Unified Diff: fusl/src/math/scalbnf.c

Issue 1573973002: Add a "fork" of musl as //fusl. (Closed) Base URL: https://github.com/domokit/mojo.git@master
Patch Set: Created 4 years, 11 months ago
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Index: fusl/src/math/scalbnf.c
diff --git a/fusl/src/math/scalbnf.c b/fusl/src/math/scalbnf.c
new file mode 100644
index 0000000000000000000000000000000000000000..0b62c3c71f85d4b72a21a9b39752fb77ce0caf10
--- /dev/null
+++ b/fusl/src/math/scalbnf.c
@@ -0,0 +1,31 @@
+#include <math.h>
+#include <stdint.h>
+
+float scalbnf(float x, int n)
+{
+ union {float f; uint32_t i;} u;
+ float_t y = x;
+
+ if (n > 127) {
+ y *= 0x1p127f;
+ n -= 127;
+ if (n > 127) {
+ y *= 0x1p127f;
+ n -= 127;
+ if (n > 127)
+ n = 127;
+ }
+ } else if (n < -126) {
+ y *= 0x1p-126f;
+ n += 126;
+ if (n < -126) {
+ y *= 0x1p-126f;
+ n += 126;
+ if (n < -126)
+ n = -126;
+ }
+ }
+ u.i = (uint32_t)(0x7f+n)<<23;
+ x = y * u.f;
+ return x;
+}
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