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Unified Diff: fusl/src/math/atan2f.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/atan2f.c
diff --git a/fusl/src/math/atan2f.c b/fusl/src/math/atan2f.c
index c634d00fc93195f63d25b59c0ae6e4a0e8e826d2..559f0b7579677e73aa5e02df38da359e6f8fc65a 100644
--- a/fusl/src/math/atan2f.c
+++ b/fusl/src/math/atan2f.c
@@ -15,69 +15,81 @@
#include "libm.h"
-static const float
-pi = 3.1415927410e+00, /* 0x40490fdb */
-pi_lo = -8.7422776573e-08; /* 0xb3bbbd2e */
+static const float pi = 3.1415927410e+00, /* 0x40490fdb */
+ pi_lo = -8.7422776573e-08; /* 0xb3bbbd2e */
-float atan2f(float y, float x)
-{
- float z;
- uint32_t m,ix,iy;
+float atan2f(float y, float x) {
+ float z;
+ uint32_t m, ix, iy;
- if (isnan(x) || isnan(y))
- return x+y;
- GET_FLOAT_WORD(ix, x);
- GET_FLOAT_WORD(iy, y);
- if (ix == 0x3f800000) /* x=1.0 */
- return atanf(y);
- m = ((iy>>31)&1) | ((ix>>30)&2); /* 2*sign(x)+sign(y) */
- ix &= 0x7fffffff;
- iy &= 0x7fffffff;
+ if (isnan(x) || isnan(y))
+ return x + y;
+ GET_FLOAT_WORD(ix, x);
+ GET_FLOAT_WORD(iy, y);
+ if (ix == 0x3f800000) /* x=1.0 */
+ return atanf(y);
+ m = ((iy >> 31) & 1) | ((ix >> 30) & 2); /* 2*sign(x)+sign(y) */
+ ix &= 0x7fffffff;
+ iy &= 0x7fffffff;
- /* when y = 0 */
- if (iy == 0) {
- switch (m) {
- case 0:
- case 1: return y; /* atan(+-0,+anything)=+-0 */
- case 2: return pi; /* atan(+0,-anything) = pi */
- case 3: return -pi; /* atan(-0,-anything) =-pi */
- }
- }
- /* when x = 0 */
- if (ix == 0)
- return m&1 ? -pi/2 : pi/2;
- /* when x is INF */
- if (ix == 0x7f800000) {
- if (iy == 0x7f800000) {
- switch (m) {
- case 0: return pi/4; /* atan(+INF,+INF) */
- case 1: return -pi/4; /* atan(-INF,+INF) */
- case 2: return 3*pi/4; /*atan(+INF,-INF)*/
- case 3: return -3*pi/4; /*atan(-INF,-INF)*/
- }
- } else {
- switch (m) {
- case 0: return 0.0f; /* atan(+...,+INF) */
- case 1: return -0.0f; /* atan(-...,+INF) */
- case 2: return pi; /* atan(+...,-INF) */
- case 3: return -pi; /* atan(-...,-INF) */
- }
- }
- }
- /* |y/x| > 0x1p26 */
- if (ix+(26<<23) < iy || iy == 0x7f800000)
- return m&1 ? -pi/2 : pi/2;
+ /* when y = 0 */
+ if (iy == 0) {
+ switch (m) {
+ case 0:
+ case 1:
+ return y; /* atan(+-0,+anything)=+-0 */
+ case 2:
+ return pi; /* atan(+0,-anything) = pi */
+ case 3:
+ return -pi; /* atan(-0,-anything) =-pi */
+ }
+ }
+ /* when x = 0 */
+ if (ix == 0)
+ return m & 1 ? -pi / 2 : pi / 2;
+ /* when x is INF */
+ if (ix == 0x7f800000) {
+ if (iy == 0x7f800000) {
+ switch (m) {
+ case 0:
+ return pi / 4; /* atan(+INF,+INF) */
+ case 1:
+ return -pi / 4; /* atan(-INF,+INF) */
+ case 2:
+ return 3 * pi / 4; /*atan(+INF,-INF)*/
+ case 3:
+ return -3 * pi / 4; /*atan(-INF,-INF)*/
+ }
+ } else {
+ switch (m) {
+ case 0:
+ return 0.0f; /* atan(+...,+INF) */
+ case 1:
+ return -0.0f; /* atan(-...,+INF) */
+ case 2:
+ return pi; /* atan(+...,-INF) */
+ case 3:
+ return -pi; /* atan(-...,-INF) */
+ }
+ }
+ }
+ /* |y/x| > 0x1p26 */
+ if (ix + (26 << 23) < iy || iy == 0x7f800000)
+ return m & 1 ? -pi / 2 : pi / 2;
- /* z = atan(|y/x|) with correct underflow */
- if ((m&2) && iy+(26<<23) < ix) /*|y/x| < 0x1p-26, x < 0 */
- z = 0.0;
- else
- z = atanf(fabsf(y/x));
- switch (m) {
- case 0: return z; /* atan(+,+) */
- case 1: return -z; /* atan(-,+) */
- case 2: return pi - (z-pi_lo); /* atan(+,-) */
- default: /* case 3 */
- return (z-pi_lo) - pi; /* atan(-,-) */
- }
+ /* z = atan(|y/x|) with correct underflow */
+ if ((m & 2) && iy + (26 << 23) < ix) /*|y/x| < 0x1p-26, x < 0 */
+ z = 0.0;
+ else
+ z = atanf(fabsf(y / x));
+ switch (m) {
+ case 0:
+ return z; /* atan(+,+) */
+ case 1:
+ return -z; /* atan(-,+) */
+ case 2:
+ return pi - (z - pi_lo); /* atan(+,-) */
+ default: /* case 3 */
+ return (z - pi_lo) - pi; /* atan(-,-) */
+ }
}

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