[libclc] [libclc] Move sinh, cosh & tanh to the CLC library (PR #134063)

[Fraser Cormack via cfe-commits]

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@@ -0,0 +1,201 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#if __CLC_FPSIZE == 32
+
+_CLC_OVERLOAD _CLC_DEF __CLC_GENTYPE __clc_cosh(__CLC_GENTYPE x) {
+  // After dealing with special cases the computation is split into regions as
+  // follows. abs(x) >= max_cosh_arg: cosh(x) = sign(x)*Inf abs(x) >=
+  // small_threshold: cosh(x) = sign(x)*exp(abs(x))/2 computed using the
+  // splitexp and scaleDouble functions as for exp_amd().
+  // abs(x) < small_threshold:
+  // compute p = exp(y) - 1 and then z = 0.5*(p+(p/(p+1.0)))
+  // cosh(x) is then z.
+
+  const __CLC_GENTYPE max_cosh_arg = 0x1.65a9fap+6f;
+  const __CLC_GENTYPE small_threshold = 0x1.0a2b24p+3f;
+
+  __CLC_UINTN ux = __CLC_AS_UINTN(x);
+  __CLC_UINTN aux = ux & EXSIGNBIT_SP32;
+  __CLC_GENTYPE y = __CLC_AS_GENTYPE(aux);
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frasercrmck wrote:

good catch, thanks.

https://github.com/llvm/llvm-project/pull/134063