Move EXP2_MID_BITS to a new header shared between exp2f16 and exp10f16

Author: overmighty

libc/src/math/generic/CMakeLists.txt

@@ -1402,6 +1402,7 @@ add_entrypoint_object(
   HDRS
     ../exp2f16.h
   DEPENDS
+    .expxf16
     libc.hdr.errno_macros
     libc.hdr.fenv_macros
     libc.src.__support.CPP.array
@@ -1504,6 +1505,7 @@ add_entrypoint_object(
   HDRS
     ../exp10f16.h
   DEPENDS
+    .expxf16
     libc.hdr.errno_macros
     libc.hdr.fenv_macros
     libc.src.__support.CPP.array
@@ -4783,3 +4785,11 @@ add_entrypoint_object(
   COMPILE_OPTIONS
     -O3
 )
+
+add_header_library(
+  expxf16
+  HDRS
+    expxf16.h
+  DEPENDS
+    libc.src.__support.CPP.array
+)

libc/src/math/generic/exp10f16.cpp

@@ -7,6 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "src/math/exp10f16.h"
+#include "expxf16.h"
 #include "hdr/errno_macros.h"
 #include "hdr/fenv_macros.h"
 #include "src/__support/CPP/array.h"
@@ -62,14 +63,6 @@ static constexpr float LOG2F_10 = 0x1.a934fp+1f;
 //   > round(log10(2), SG, RN);
 static constexpr float LOG10F_2 = 0x1.344136p-2f;
 
-// Generated by Sollya with the following commands:
-//   > display = hexadecimal;
-//   > for i from 0 to 7 do printsingle(round(2^(i * 2^-3), SG, RN));
-static constexpr cpp::array<uint32_t, 8> EXP2_MID_BITS = {
-    0x3f80'0000U, 0x3f8b'95c2U, 0x3f98'37f0U, 0x3fa5'fed7U,
-    0x3fb5'04f3U, 0x3fc5'672aU, 0x3fd7'44fdU, 0x3fea'c0c7U,
-};
-
 LLVM_LIBC_FUNCTION(float16, exp10f16, (float16 x)) {
   using FPBits = fputil::FPBits<float16>;
   FPBits x_bits(x);

libc/src/math/generic/exp2f16.cpp

@@ -7,6 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "src/math/exp2f16.h"
+#include "expxf16.h"
 #include "hdr/errno_macros.h"
 #include "hdr/fenv_macros.h"
 #include "src/__support/CPP/array.h"
@@ -33,14 +34,6 @@ static constexpr fputil::ExceptValues<float16, 3> EXP2F16_EXCEPTS = {{
     {0xaf57U, 0x3b63U, 1U, 0U, 0U},
 }};
 
-// Generated by Sollya with the following commands:
-//   > display = hexadecimal;
-//   > for i from 0 to 7 do printsingle(round(2^(i * 2^-3), SG, RN));
-static constexpr cpp::array<uint32_t, 8> EXP2_MID_BITS = {
-    0x3f80'0000U, 0x3f8b'95c2U, 0x3f98'37f0U, 0x3fa5'fed7U,
-    0x3fb5'04f3U, 0x3fc5'672aU, 0x3fd7'44fdU, 0x3fea'c0c7U,
-};
-
 LLVM_LIBC_FUNCTION(float16, exp2f16, (float16 x)) {
   using FPBits = fputil::FPBits<float16>;
   FPBits x_bits(x);

libc/src/math/generic/expxf16.h

@@ -0,0 +1,28 @@
+//===-- Common utilities for half-precision exponential functions ---------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC_MATH_GENERIC_EXPXF16_H
+#define LLVM_LIBC_SRC_MATH_GENERIC_EXPXF16_H
+
+#include "src/__support/CPP/array.h"
+#include "src/__support/macros/config.h"
+#include <stdint.h>
+
+namespace LIBC_NAMESPACE_DECL {
+
+// Generated by Sollya with the following commands:
+//   > display = hexadecimal;
+//   > for i from 0 to 7 do printsingle(round(2^(i * 2^-3), SG, RN));
+constexpr cpp::array<uint32_t, 8> EXP2_MID_BITS = {
+    0x3f80'0000U, 0x3f8b'95c2U, 0x3f98'37f0U, 0x3fa5'fed7U,
+    0x3fb5'04f3U, 0x3fc5'672aU, 0x3fd7'44fdU, 0x3fea'c0c7U,
+};
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC_MATH_GENERIC_EXPXF16_H