From cba703f94f5755cff7ed171718e18aa9caeb08b8 Mon Sep 17 00:00:00 2001
From: dosisod <39638017+dosisod@users.noreply.github.com>
Date: Sat, 6 Mar 2021 21:41:25 -0800
Subject: [PATCH] Implement tgmath.h

Format with clang-format
---
 libc/isystem/tgmath.h |  2 +-
 libc/tgmath.h         | 60 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 61 insertions(+), 1 deletion(-)
 create mode 100644 libc/tgmath.h

diff --git a/libc/isystem/tgmath.h b/libc/isystem/tgmath.h
index 59a7eaabf..e769b08b5 100644
--- a/libc/isystem/tgmath.h
+++ b/libc/isystem/tgmath.h
@@ -1,4 +1,4 @@
 #ifndef LIBC_ISYSTEM_TGMATH_H_
 #define LIBC_ISYSTEM_TGMATH_H_
-#include "libc/math/tgmath.h"
+#include "libc/tgmath.h"
 #endif
diff --git a/libc/tgmath.h b/libc/tgmath.h
new file mode 100644
index 000000000..2219ec741
--- /dev/null
+++ b/libc/tgmath.h
@@ -0,0 +1,60 @@
+#ifndef COSMOPOLITAN_LIBC_TGMATH_H_
+#define COSMOPOLITAN_LIBC_TGMATH_H_
+
+#if !(__ASSEMBLER__ + __LINKER__ + 0)
+#if __STDC_VERSION__ + 0 >= 201112
+COSMOPOLITAN_C_START_
+
+/* from https://en.cppreference.com/w/c/numeric/tgmath */
+
+#define fabs(x) \
+  _Generic((x), float : fabsf, default : fabs, long double : fabsl)(x)
+
+#define exp(x) _Generic((x), float : expf, default : exp, long double : expl)(x)
+
+#define log(x) _Generic((x), float : logf, default : log, long double : logl)(x)
+
+#define pow(x) _Generic((x), float : powf, default : pow, long double : powl)(x)
+
+#define sqrt(x) \
+  _Generic((x), float : sqrtf, default : sqrt, long double : sqrtl)(x)
+
+#define sin(x) _Generic((x), float : sinf, default : sin, long double : sinl)(x)
+
+#define cos(x) _Generic((x), float : cosf, default : cos, long double : cosl)(x)
+
+#define tan(x) _Generic((x), float : tanf, default : tan, long double : tanl)(x)
+
+#define asin(x) \
+  _Generic((x), float : asinf, default : asin, long double : asinl)(x)
+
+#define acos(x) \
+  _Generic((x), float : acosf, default : acos, long double : acosl)(x)
+
+#define atan(x) \
+  _Generic((x), float : atanf, default : atan, long double : atanl)(x)
+
+#define sinh(x) \
+  _Generic((x), float : sinhf, default : sinh, long double : sinhl)(x)
+
+#define cosh(x) \
+  _Generic((x), float : coshf, default : cosh, long double : coshl)(x)
+
+#define tanh(x) \
+  _Generic((x), float : tanhf, default : tanh, long double : tanhl)(x)
+
+#define asinh(x) \
+  _Generic((x), float : asinhf, default : asinh, long double : asinhl)(x)
+
+#define acosh(x) \
+  _Generic((x), float : acoshf, default : acosh, long double : acoshl)(x)
+
+#define atanh(x) \
+  _Generic((x), float : atanhf, default : atanh, long double : atanhl)(x)
+
+COSMOPOLITAN_C_END_
+
+#endif /* C11 */
+#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
+
+#endif /* COSMOPOLITAN_LIBC_TGMATH_H_ */