From 1a5f963ef0b49cfb44a9bcfa9dc355bdfee532fd Mon Sep 17 00:00:00 2001
From: UnknownShadow200 <unknownshadow200@gmail.com>
Date: Sun, 9 Feb 2020 16:55:12 +1100
Subject: [PATCH] Make Math_AbsF/Math_SqrtF defines when compiling with
 gcc/clang. This way they get compiled to an inline intrinsic instruction,
 instead of a slow function call

---
 src/ExtMath.c | 3 +++
 src/ExtMath.h | 8 ++++++++
 2 files changed, 11 insertions(+)

diff --git a/src/ExtMath.c b/src/ExtMath.c
index d31950933..a4d3a60ec 100644
--- a/src/ExtMath.c
+++ b/src/ExtMath.c
@@ -7,8 +7,11 @@
 
 /* TODO: Replace with own functions that don't rely on <math> */
 
+#ifndef __GNUC__
 float Math_AbsF(float x)  { return fabsf(x); /* MSVC intrinsic */ }
 float Math_SqrtF(float x) { return sqrtf(x); /* MSVC intrinsic */ }
+#endif
+
 float Math_Mod1(float x)  { return x - (int)x; /* fmodf(x, 1); */ }
 int   Math_AbsI(int x)    { return abs(x); /* MSVC intrinsic */ }
 
diff --git a/src/ExtMath.h b/src/ExtMath.h
index 29fb62b50..0dc7e8705 100644
--- a/src/ExtMath.h
+++ b/src/ExtMath.h
@@ -15,8 +15,16 @@
 #define Math_Deg2Packed(x) ((cc_uint8)((x) * 256.0f / 360.0f))
 #define Math_Packed2Deg(x) ((x) * 360.0f / 256.0f)
 
+#ifdef __GNUC__
+/* fabsf/sqrtf are single intrinsic instructions in gcc/clang */
+/* (sqrtf is only when -fno-math-errno though) */
+#define Math_AbsF(x) __builtin_fabsf(x)
+#define Math_SqrtF(x) __builtin_sqrtf(x)
+#else
 float Math_AbsF(float x);
 float Math_SqrtF(float x);
+#endif
+
 float Math_Mod1(float x);
 int   Math_AbsI(int x);