[libc-commits] [libc] [libc][math] Integer-only, statically rounded implementation of expf (PR #209406)

[Hoàng Minh Thiên via libc-commits]

================
@@ -0,0 +1,319 @@
+//===-- Implementation header for expf using integer-only --------*- 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
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_MATH_EXP_INTEGER_EVAL_H
+#define LLVM_LIBC_SRC___SUPPORT_MATH_EXP_INTEGER_EVAL_H
+
+#include "src/__support/CPP/bit.h"
+#include "src/__support/FPUtil/FPBits.h"
+#include "src/__support/FPUtil/PolyEval.h"
+#include "src/__support/frac32.h"
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/optimization.h"
+#include "src/__support/math/check/exp_exceptions.h"
+#include "src/__support/math/exp_integer_utils.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+namespace math {
+
+namespace integer_only {
+
+// Round-nearest, no except implementation of expf using integer-only
+// arithmetic.
+// LIBC_INLINE float expf(float x) {
----------------
hmthien050209 wrote:

In fact, we're now doing statically rounded, so no more massive commented out blocks exist anymore.

https://github.com/llvm/llvm-project/pull/209406