[libc-commits] [libc] [libc][math] Make pow function correctly rounded for all rounding modes. (PR #222827)

[via libc-commits]

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@@ -1,368 +1,168 @@
-//===-- Implementation header for pow ---------------------------*- C++ -*-===//
+//===----------------------------------------------------------------------===//
 //
 // 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
 //
 //===----------------------------------------------------------------------===//
+///
+/// \file
+/// Implementation header for double-precision pow(x, y).
+///
+//===----------------------------------------------------------------------===//
 
 #ifndef LLVM_LIBC_SRC___SUPPORT_MATH_POW_H
 #define LLVM_LIBC_SRC___SUPPORT_MATH_POW_H
 
-#include "common_constants.h" // Lookup tables EXP_M1 and EXP_M2.
-#include "exp_constants.h"    // Lookup tables EXP_M1 and EXP_M2.
-#include "hdr/errno_macros.h"
-#include "hdr/fenv_macros.h"
-#include "src/__support/CPP/bit.h"
-#include "src/__support/FPUtil/FEnvImpl.h"
 #include "src/__support/FPUtil/FPBits.h"
-#include "src/__support/FPUtil/PolyEval.h"
 #include "src/__support/FPUtil/double_double.h"
 #include "src/__support/FPUtil/multiply_add.h"
 #include "src/__support/FPUtil/nearest_integer.h"
-#include "src/__support/FPUtil/sqrt.h" // Speedup for pow(x, 1/2) = sqrt(x)
 #include "src/__support/common.h"
 #include "src/__support/macros/config.h"
-#include "src/__support/macros/optimization.h" // LIBC_UNLIKELY
+#include "src/__support/macros/optimization.h"
+#include "src/__support/macros/properties/cpu_features.h"
+#include "src/__support/math/common_constants.h"
+#include "src/__support/math/exp_constants.h"
+#include "src/__support/math/pow_utils.h"
+
+#ifdef LIBC_MATH_HAS_SKIP_ACCURATE_PASS
+#include "src/__support/math/pow_fast.h"
+#else
+
+#include "src/__support/math/pow_accurate_128.h"
+#include "src/__support/math/pow_accurate_256.h"
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lntue wrote:

Done.

https://github.com/llvm/llvm-project/pull/222827