[PATCH 2/3] backend: use M_TAU instead of M_PI

Signed-off-by: Asbjørn Sloth Tønnesen <asbjorn(at)asbjorn(dot)it>
---
src/backend/utils/adt/float.c | 4 ++--
src/backend/utils/adt/geo_ops.c | 8 ++++++--
2 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/src/backend/utils/adt/float.c b/src/backend/utils/adt/float.c
index 1278053..b0211f8 100644
--- a/src/backend/utils/adt/float.c
+++ b/src/backend/utils/adt/float.c
@@ -1701,7 +1701,7 @@ degrees(PG_FUNCTION_ARGS)
float8 arg1 = PG_GETARG_FLOAT8(0);
float8 result;

- result = arg1 * (180.0 / M_PI);
+ result = arg1 * (360.0 / M_TAU);

CHECKFLOATVAL(result, isinf(arg1), arg1 == 0);
PG_RETURN_FLOAT8(result);
@@ -1737,7 +1737,7 @@ radians(PG_FUNCTION_ARGS)
float8 arg1 = PG_GETARG_FLOAT8(0);
float8 result;

- result = arg1 * (M_PI / 180.0);
+ result = arg1 * (M_TAU / 360.0);

CHECKFLOATVAL(result, isinf(arg1), arg1 == 0);
PG_RETURN_FLOAT8(result);
diff --git a/src/backend/utils/adt/geo_ops.c b/src/backend/utils/adt/geo_ops.c
index 54391fd..429de6d 100644
--- a/src/backend/utils/adt/geo_ops.c
+++ b/src/backend/utils/adt/geo_ops.c
@@ -23,8 +23,12 @@
#include "utils/builtins.h"
#include "utils/geo_decls.h"

+#ifndef M_TAU
+#define M_TAU 6.28318530717958647693
+#endif
+
#ifndef M_PI
-#define M_PI 3.14159265358979323846
+#define M_PI (M_TAU / 2.0)
#endif


@@ -5168,7 +5172,7 @@ circle_poly(PG_FUNCTION_ARGS)
SET_VARSIZE(poly, size);
poly->npts = npts;

- anglestep = (2.0 * M_PI) / npts;
+ anglestep = M_TAU / npts;

for (i = 0; i < npts; i++)
{
--
2.0.0