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

Issue 1714623002: [fusl] clang-format fusl (Closed) Base URL: git@github.com:domokit/mojo.git@master
Patch Set: headers too Created 4 years, 10 months ago
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Index: fusl/src/math/expf.c
diff --git a/fusl/src/math/expf.c b/fusl/src/math/expf.c
index 16e9afe62a21cbd09d6845f8076fb37e4fa5a560..34ccafa84b87498e3b31d9ec9fd69d15041de0b2 100644
--- a/fusl/src/math/expf.c
+++ b/fusl/src/math/expf.c
@@ -15,67 +15,65 @@
#include "libm.h"
-static const float
-half[2] = {0.5,-0.5},
-ln2hi = 6.9314575195e-1f, /* 0x3f317200 */
-ln2lo = 1.4286067653e-6f, /* 0x35bfbe8e */
-invln2 = 1.4426950216e+0f, /* 0x3fb8aa3b */
-/*
- * Domain [-0.34568, 0.34568], range ~[-4.278e-9, 4.447e-9]:
- * |x*(exp(x)+1)/(exp(x)-1) - p(x)| < 2**-27.74
- */
-P1 = 1.6666625440e-1f, /* 0xaaaa8f.0p-26 */
-P2 = -2.7667332906e-3f; /* -0xb55215.0p-32 */
+static const float half[2] = {0.5, -0.5},
+ ln2hi = 6.9314575195e-1f, /* 0x3f317200 */
+ ln2lo = 1.4286067653e-6f, /* 0x35bfbe8e */
+ invln2 = 1.4426950216e+0f, /* 0x3fb8aa3b */
+ /*
+ * Domain [-0.34568, 0.34568], range ~[-4.278e-9, 4.447e-9]:
+ * |x*(exp(x)+1)/(exp(x)-1) - p(x)| < 2**-27.74
+ */
+ P1 = 1.6666625440e-1f, /* 0xaaaa8f.0p-26 */
+ P2 = -2.7667332906e-3f; /* -0xb55215.0p-32 */
-float expf(float x)
-{
- float_t hi, lo, c, xx, y;
- int k, sign;
- uint32_t hx;
+float expf(float x) {
+ float_t hi, lo, c, xx, y;
+ int k, sign;
+ uint32_t hx;
- GET_FLOAT_WORD(hx, x);
- sign = hx >> 31; /* sign bit of x */
- hx &= 0x7fffffff; /* high word of |x| */
+ GET_FLOAT_WORD(hx, x);
+ sign = hx >> 31; /* sign bit of x */
+ hx &= 0x7fffffff; /* high word of |x| */
- /* special cases */
- if (hx >= 0x42aeac50) { /* if |x| >= -87.33655f or NaN */
- if (hx >= 0x42b17218 && !sign) { /* x >= 88.722839f */
- /* overflow */
- x *= 0x1p127f;
- return x;
- }
- if (sign) {
- /* underflow */
- FORCE_EVAL(-0x1p-149f/x);
- if (hx >= 0x42cff1b5) /* x <= -103.972084f */
- return 0;
- }
- }
+ /* special cases */
+ if (hx >= 0x42aeac50) { /* if |x| >= -87.33655f or NaN */
+ if (hx >= 0x42b17218 && !sign) { /* x >= 88.722839f */
+ /* overflow */
+ x *= 0x1p127f;
+ return x;
+ }
+ if (sign) {
+ /* underflow */
+ FORCE_EVAL(-0x1p-149f / x);
+ if (hx >= 0x42cff1b5) /* x <= -103.972084f */
+ return 0;
+ }
+ }
- /* argument reduction */
- if (hx > 0x3eb17218) { /* if |x| > 0.5 ln2 */
- if (hx > 0x3f851592) /* if |x| > 1.5 ln2 */
- k = invln2*x + half[sign];
- else
- k = 1 - sign - sign;
- hi = x - k*ln2hi; /* k*ln2hi is exact here */
- lo = k*ln2lo;
- x = hi - lo;
- } else if (hx > 0x39000000) { /* |x| > 2**-14 */
- k = 0;
- hi = x;
- lo = 0;
- } else {
- /* raise inexact */
- FORCE_EVAL(0x1p127f + x);
- return 1 + x;
- }
+ /* argument reduction */
+ if (hx > 0x3eb17218) { /* if |x| > 0.5 ln2 */
+ if (hx > 0x3f851592) /* if |x| > 1.5 ln2 */
+ k = invln2 * x + half[sign];
+ else
+ k = 1 - sign - sign;
+ hi = x - k * ln2hi; /* k*ln2hi is exact here */
+ lo = k * ln2lo;
+ x = hi - lo;
+ } else if (hx > 0x39000000) { /* |x| > 2**-14 */
+ k = 0;
+ hi = x;
+ lo = 0;
+ } else {
+ /* raise inexact */
+ FORCE_EVAL(0x1p127f + x);
+ return 1 + x;
+ }
- /* x is now in primary range */
- xx = x*x;
- c = x - xx*(P1+xx*P2);
- y = 1 + (x*c/(2-c) - lo + hi);
- if (k == 0)
- return y;
- return scalbnf(y, k);
+ /* x is now in primary range */
+ xx = x * x;
+ c = x - xx * (P1 + xx * P2);
+ y = 1 + (x * c / (2 - c) - lo + hi);
+ if (k == 0)
+ return y;
+ return scalbnf(y, k);
}

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