[libc-commits] [libc] 82204a4 - [libc][math] Refactor ilogbf implementation to header-only in src/__support/math folder. (#175522)
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Mon Jan 19 07:57:41 PST 2026
Author: Anonymous
Date: 2026-01-19T17:57:36+02:00
New Revision: 82204a482bf7d1496560a6cd0cc61165d38a0ee2
URL: https://github.com/llvm/llvm-project/commit/82204a482bf7d1496560a6cd0cc61165d38a0ee2
DIFF: https://github.com/llvm/llvm-project/commit/82204a482bf7d1496560a6cd0cc61165d38a0ee2.diff
LOG: [libc][math] Refactor ilogbf implementation to header-only in src/__support/math folder. (#175522)
closes #175347 , part of #175344
Added:
libc/shared/math/ilogbf.h
libc/src/__support/math/ilogbf.h
Modified:
libc/shared/math.h
libc/src/__support/math/CMakeLists.txt
libc/src/math/generic/CMakeLists.txt
libc/src/math/generic/ilogbf.cpp
libc/test/shared/CMakeLists.txt
libc/test/shared/shared_math_test.cpp
utils/bazel/llvm-project-overlay/libc/BUILD.bazel
Removed:
################################################################################
diff --git a/libc/shared/math.h b/libc/shared/math.h
index 6b66c5e75e457..d58238703701d 100644
--- a/libc/shared/math.h
+++ b/libc/shared/math.h
@@ -65,6 +65,7 @@
#include "math/fsqrt.h"
#include "math/fsqrtf128.h"
#include "math/hypotf.h"
+#include "math/ilogbf.h"
#include "math/ilogbf16.h"
#include "math/ilogbl.h"
#include "math/ldexpf.h"
diff --git a/libc/shared/math/ilogbf.h b/libc/shared/math/ilogbf.h
new file mode 100644
index 0000000000000..c50972a0dc50a
--- /dev/null
+++ b/libc/shared/math/ilogbf.h
@@ -0,0 +1,22 @@
+//===-- Shared ilogbf 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_ILOGBF_H
+#define LLVM_LIBC_SHARED_MATH_ILOGBF_H
+
+#include "src/__support/math/ilogbf.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace shared {
+
+using math::ilogbf;
+
+} // namespace shared
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SHARED_MATH_ILOGBF_H
diff --git a/libc/src/__support/math/CMakeLists.txt b/libc/src/__support/math/CMakeLists.txt
index 0e7a082434fb5..bf1c4463b8066 100644
--- a/libc/src/__support/math/CMakeLists.txt
+++ b/libc/src/__support/math/CMakeLists.txt
@@ -390,7 +390,6 @@ add_header_library(
cosf.h
DEPENDS
.sincosf_utils
- libc.src.errno.errno
libc.src.__support.FPUtil.basic_operations
libc.src.__support.FPUtil.fenv_impl
libc.src.__support.FPUtil.fp_bits
@@ -660,6 +659,16 @@ add_header_library(
libc.include.llvm-libc-macros.float16_macros
)
+add_header_library(
+ ilogbf
+ HDRS
+ ilogbf.h
+ DEPENDS
+ libc.src.__support.macros.config
+ libc.src.__support.macros.properties.types
+ libc.src.__support.FPUtil.manipulation_functions
+)
+
add_header_library(
ldexpf128
HDRS
diff --git a/libc/src/__support/math/ilogbf.h b/libc/src/__support/math/ilogbf.h
new file mode 100644
index 0000000000000..dfc8f62510354
--- /dev/null
+++ b/libc/src/__support/math/ilogbf.h
@@ -0,0 +1,26 @@
+//===-- Implementation header for ilogbf ----------------------*- 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_ILOGBF_H
+#define LLVM_LIBC_SRC___SUPPORT_MATH_ILOGBF_H
+
+#include "src/__support/FPUtil/ManipulationFunctions.h"
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+namespace math {
+
+LIBC_INLINE constexpr int ilogbf(float x) { return fputil::intlogb<int>(x); }
+
+} // namespace math
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_MATH_ILOGBF_H
diff --git a/libc/src/math/generic/CMakeLists.txt b/libc/src/math/generic/CMakeLists.txt
index bf799ce41363c..b578d1805f2a8 100644
--- a/libc/src/math/generic/CMakeLists.txt
+++ b/libc/src/math/generic/CMakeLists.txt
@@ -1772,7 +1772,7 @@ add_entrypoint_object(
HDRS
../ilogbf.h
DEPENDS
- libc.src.__support.FPUtil.manipulation_functions
+ libc.src.__support.math.ilogbf
)
add_entrypoint_object(
diff --git a/libc/src/math/generic/ilogbf.cpp b/libc/src/math/generic/ilogbf.cpp
index 7da2aff3de316..0ed2cb569fd2e 100644
--- a/libc/src/math/generic/ilogbf.cpp
+++ b/libc/src/math/generic/ilogbf.cpp
@@ -7,12 +7,10 @@
//===----------------------------------------------------------------------===//
#include "src/math/ilogbf.h"
-#include "src/__support/FPUtil/ManipulationFunctions.h"
-#include "src/__support/common.h"
-#include "src/__support/macros/config.h"
+#include "src/__support/math/ilogbf.h"
namespace LIBC_NAMESPACE_DECL {
-LLVM_LIBC_FUNCTION(int, ilogbf, (float x)) { return fputil::intlogb<int>(x); }
+LLVM_LIBC_FUNCTION(int, ilogbf, (float x)) { return math::ilogbf(x); }
} // namespace LIBC_NAMESPACE_DECL
diff --git a/libc/test/shared/CMakeLists.txt b/libc/test/shared/CMakeLists.txt
index 3be8f992aa486..cfc2eda1aaec9 100644
--- a/libc/test/shared/CMakeLists.txt
+++ b/libc/test/shared/CMakeLists.txt
@@ -61,6 +61,7 @@ add_fp_unittest(
libc.src.__support.math.fsqrt
libc.src.__support.math.fsqrtf128
libc.src.__support.math.hypotf
+ libc.src.__support.math.ilogbf
libc.src.__support.math.ilogbf16
libc.src.__support.math.ilogbl
libc.src.__support.math.log
diff --git a/libc/test/shared/shared_math_test.cpp b/libc/test/shared/shared_math_test.cpp
index 655d96692f1b8..88e6ecc98a0a7 100644
--- a/libc/test/shared/shared_math_test.cpp
+++ b/libc/test/shared/shared_math_test.cpp
@@ -78,6 +78,8 @@ TEST(LlvmLibcSharedMathTest, AllFloat) {
LIBC_NAMESPACE::shared::frexpf(24.0f, &exponent));
EXPECT_EQ(exponent, 5);
+ EXPECT_EQ(0, LIBC_NAMESPACE::shared::ilogbf(1.0f));
+
ASSERT_FP_EQ(float(8 << 5), LIBC_NAMESPACE::shared::ldexpf(8.0f, 5));
ASSERT_FP_EQ(float(-1 * (8 << 5)), LIBC_NAMESPACE::shared::ldexpf(-8.0f, 5));
diff --git a/utils/bazel/llvm-project-overlay/libc/BUILD.bazel b/utils/bazel/llvm-project-overlay/libc/BUILD.bazel
index 7251f491bc757..90b1da0e3376e 100644
--- a/utils/bazel/llvm-project-overlay/libc/BUILD.bazel
+++ b/utils/bazel/llvm-project-overlay/libc/BUILD.bazel
@@ -2881,6 +2881,16 @@ libc_support_library(
],
)
+libc_support_library(
+ name = "__support_math_ilogbf",
+ hdrs = ["src/__support/math/ilogbf.h"],
+ deps = [
+ ":__support_common",
+ ":__support_fputil_manipulation_functions",
+ ":__support_macros_config",
+ ],
+)
+
libc_support_library(
name = "__support_math_ilogbl",
hdrs = ["src/__support/math/ilogbl.h"],
@@ -4427,7 +4437,12 @@ libc_math_function(
libc_math_function(name = "ilogb")
-libc_math_function(name = "ilogbf")
+libc_math_function(
+ name = "ilogbf",
+ additional_deps = [
+ ":__support_math_ilogbf",
+ ],
+)
libc_math_function(
name = "ilogbl",
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