[libc][math] Refactor ldexpf implementation to header-only in src/__support/math folder #147906
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bassiounix
requested review from
rupprecht,
keith and
aaronmondal
as code owners
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@llvm/pr-subscribers-libc Author: Muhammad Bassiouni (bassiounix) ChangesPart of #147386 in preparation for: https://discourse.llvm.org/t/rfc-make-clang-builtin-math-functions-constexpr-with-llvm-libc-to-support-c-23-constexpr-math-functions/86450 @lntue Full diff: https://github.com/llvm/llvm-project/pull/147906.diff 7 Files Affected:
diff --git a/libc/shared/math.h b/libc/shared/math.h
index 4ddc29c7ae834..50ae0e1581744 100644
--- a/libc/shared/math.h
+++ b/libc/shared/math.h
@@ -12,5 +12,6 @@
#include "libc_common.h"
#include "math/expf.h"
+#include "math/ldexpf.h"
#endif // LLVM_LIBC_SHARED_MATH_H
diff --git a/libc/shared/math/ldexpf.h b/libc/shared/math/ldexpf.h
new file mode 100644
index 0000000000000..497933c47321f
--- /dev/null
+++ b/libc/shared/math/ldexpf.h
@@ -0,0 +1,23 @@
+//===-- Shared ldexpf function ----------------------------------*- 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_SHARED_MATH_LDEXPF_H
+#define LLVM_LIBC_SHARED_MATH_LDEXPF_H
+
+#include "shared/libc_common.h"
+#include "src/__support/math/ldexpf.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace shared {
+
+using math::ldexpf;
+
+} // namespace shared
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SHARED_MATH_LDEXPF_H
diff --git a/libc/src/__support/math/CMakeLists.txt b/libc/src/__support/math/CMakeLists.txt
index 66c1d19a1cab0..49ab6220919de 100644
--- a/libc/src/__support/math/CMakeLists.txt
+++ b/libc/src/__support/math/CMakeLists.txt
@@ -22,3 +22,11 @@ add_header_library(
libc.src.__support.macros.config
libc.src.__support.macros.optimization
)
+
+add_header_library(
+ ldexpf
+ HDRS
+ ldexpf.h
+ DEPENDS
+ libc.src.__support.FPUtil.manipulation_functions
+)
diff --git a/libc/src/__support/math/ldexpf.h b/libc/src/__support/math/ldexpf.h
new file mode 100644
index 0000000000000..3a5ec1d471337
--- /dev/null
+++ b/libc/src/__support/math/ldexpf.h
@@ -0,0 +1,28 @@
+//===-- Implementation header for ldexpf ------------------------*- 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_LDEXPF_H
+#define LLVM_LIBC_SRC___SUPPORT_MATH_LDEXPF_H
+
+#include "src/__support/FPUtil/ManipulationFunctions.h"
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+namespace math {
+
+static constexpr float ldexpf(float x, int exp) {
+ return fputil::ldexp(x, exp);
+}
+
+} // namespace math
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_MATH_LDEXPF_H
diff --git a/libc/src/math/generic/CMakeLists.txt b/libc/src/math/generic/CMakeLists.txt
index fd1e6c0d648aa..4a0f585d1f52d 100644
--- a/libc/src/math/generic/CMakeLists.txt
+++ b/libc/src/math/generic/CMakeLists.txt
@@ -1911,7 +1911,7 @@ add_entrypoint_object(
HDRS
../ldexpf.h
DEPENDS
- libc.src.__support.FPUtil.manipulation_functions
+ libc.src.__support.math.ldexpf
)
add_entrypoint_object(
diff --git a/libc/src/math/generic/ldexpf.cpp b/libc/src/math/generic/ldexpf.cpp
index 63c5d219f7a79..c5f30bb725e6b 100644
--- a/libc/src/math/generic/ldexpf.cpp
+++ b/libc/src/math/generic/ldexpf.cpp
@@ -7,14 +7,12 @@
//===----------------------------------------------------------------------===//
#include "src/math/ldexpf.h"
-#include "src/__support/FPUtil/ManipulationFunctions.h"
-#include "src/__support/common.h"
-#include "src/__support/macros/config.h"
+#include "src/__support/math/ldexpf.h"
namespace LIBC_NAMESPACE_DECL {
LLVM_LIBC_FUNCTION(float, ldexpf, (float x, int exp)) {
- return fputil::ldexp(x, exp);
+ return math::ldexpf(x, exp);
}
} // namespace LIBC_NAMESPACE_DECL
diff --git a/utils/bazel/llvm-project-overlay/libc/BUILD.bazel b/utils/bazel/llvm-project-overlay/libc/BUILD.bazel
index 2484a2f1e2bd7..ab9d16cc29168 100644
--- a/utils/bazel/llvm-project-overlay/libc/BUILD.bazel
+++ b/utils/bazel/llvm-project-overlay/libc/BUILD.bazel
@@ -2096,6 +2096,14 @@ libc_support_library(
],
)
+libc_support_library(
+ name = "__support_math_ldexpf",
+ hdrs = ["src/__support/math/ldexpf.h"],
+ deps = [
+ ":__support_fputil_manipulation_functions",
+ ],
+)
+
############################### complex targets ################################
libc_function(
@@ -3229,7 +3237,12 @@ libc_math_function(name = "ilogbf16")
libc_math_function(name = "ldexp")
-libc_math_function(name = "ldexpf")
+libc_math_function(
+ name = "ldexpf",
+ additional_deps = [
+ ":__support_math_ldexpf",
+ ]
+)
libc_math_function(name = "ldexpl")
|
…upport/math folder
lntue
approved these changes
Jul 14, 2025
|
LLVM Buildbot has detected a new failure on builder Full details are available at: https://lab.llvm.org/buildbot/#/builders/153/builds/37999 Here is the relevant piece of the build log for the reference |
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Part of #147386
in preparation for: https://discourse.llvm.org/t/rfc-make-clang-builtin-math-functions-constexpr-with-llvm-libc-to-support-c-23-constexpr-math-functions/86450
Please merge #147901 first
@lntue