[libc-commits] [libc] [llvm] [libc][math] Refactor f16sqrt to Header Only (PR #177167)
Zhihui Yang via libc-commits
libc-commits at lists.llvm.org
Wed Jan 21 05:41:23 PST 2026
https://github.com/YGGkk updated https://github.com/llvm/llvm-project/pull/177167
>From a09a7289c68966da1066aa688d2ab09adb4c1100 Mon Sep 17 00:00:00 2001
From: Zhihui Yang <youngwisdm at gmail.com>
Date: Wed, 21 Jan 2026 05:37:18 -0800
Subject: [PATCH 1/2] [libc][math] Refactor f16sqrt to Header Only
---
libc/shared/math.h | 1 +
libc/shared/math/f16sqrt.h | 23 ++++++++++++++++++
libc/src/__support/math/CMakeLists.txt | 10 ++++++++
libc/src/__support/math/f16sqrt.h | 24 +++++++++++++++++++
libc/src/math/generic/f16sqrt.cpp | 8 ++-----
libc/test/shared/CMakeLists.txt | 1 +
libc/test/shared/shared_math_test.cpp | 1 +
.../llvm-project-overlay/libc/BUILD.bazel | 12 +++++++++-
8 files changed, 73 insertions(+), 7 deletions(-)
create mode 100644 libc/shared/math/f16sqrt.h
create mode 100644 libc/src/__support/math/f16sqrt.h
diff --git a/libc/shared/math.h b/libc/shared/math.h
index 2e7bbe1ef13be..59b3c1ccfc27a 100644
--- a/libc/shared/math.h
+++ b/libc/shared/math.h
@@ -69,6 +69,7 @@
#include "math/log.h"
#include "math/rsqrtf.h"
#include "math/rsqrtf16.h"
+#include "math/f16sqrt.h"
#include "math/sin.h"
#endif // LLVM_LIBC_SHARED_MATH_H
diff --git a/libc/shared/math/f16sqrt.h b/libc/shared/math/f16sqrt.h
new file mode 100644
index 0000000000000..e41e7865c8448
--- /dev/null
+++ b/libc/shared/math/f16sqrt.h
@@ -0,0 +1,23 @@
+//===-- Shared f16sqrt 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_F16SQRT_H
+#define LLVM_LIBC_SHARED_MATH_F16SQRT_H
+
+#include "shared/libc_common.h"
+#include "src/__support/math/f16sqrt.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace shared {
+
+using math::f16sqrt;
+
+} // namespace shared
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SHARED_MATH_F16SQRT_H
diff --git a/libc/src/__support/math/CMakeLists.txt b/libc/src/__support/math/CMakeLists.txt
index b45ccfc0eb3cb..9003e0980ccd6 100644
--- a/libc/src/__support/math/CMakeLists.txt
+++ b/libc/src/__support/math/CMakeLists.txt
@@ -1096,3 +1096,13 @@ add_header_library(
libc.src.__support.common
libc.src.__support.macros.config
)
+
+add_header_library(
+ f16sqrt
+ HDRS
+ f16sqrt.h
+ DEPENDS
+ libc.src.__support.FPUtil.generic.sqrt
+ libc.src.__support.common
+ libc.src.__support.macros.config
+)
\ No newline at end of file
diff --git a/libc/src/__support/math/f16sqrt.h b/libc/src/__support/math/f16sqrt.h
new file mode 100644
index 0000000000000..6294265a730ce
--- /dev/null
+++ b/libc/src/__support/math/f16sqrt.h
@@ -0,0 +1,24 @@
+//===-- Implementation header for f16sqrt -----------------------*- 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_SINPIF_H
+#define LLVM_LIBC_SRC___SUPPORT_MATH_SINPIF_H
+
+#include "src/__support/FPUtil/sqrt.h"
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace math {
+LIBC_INLINE static constexpr float16 f16sqrt(double x) {
+ return fputil::sqrt<float16>(x);
+}
+} // namespace math
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_MATH_SINPIF_H
diff --git a/libc/src/math/generic/f16sqrt.cpp b/libc/src/math/generic/f16sqrt.cpp
index 4addb553a5851..d33d51355bd39 100644
--- a/libc/src/math/generic/f16sqrt.cpp
+++ b/libc/src/math/generic/f16sqrt.cpp
@@ -7,14 +7,10 @@
//===----------------------------------------------------------------------===//
#include "src/math/f16sqrt.h"
-#include "src/__support/FPUtil/sqrt.h"
-#include "src/__support/common.h"
-#include "src/__support/macros/config.h"
+#include "src/__support/math/f16sqrt.h"
namespace LIBC_NAMESPACE_DECL {
-
LLVM_LIBC_FUNCTION(float16, f16sqrt, (double x)) {
- return fputil::sqrt<float16>(x);
+ return math::f16sqrt(x);
}
-
} // namespace LIBC_NAMESPACE_DECL
diff --git a/libc/test/shared/CMakeLists.txt b/libc/test/shared/CMakeLists.txt
index 58214bf6f88eb..ae3869a52c7e7 100644
--- a/libc/test/shared/CMakeLists.txt
+++ b/libc/test/shared/CMakeLists.txt
@@ -66,4 +66,5 @@ add_fp_unittest(
libc.src.__support.math.rsqrtf
libc.src.__support.math.rsqrtf16
libc.src.__support.math.sin
+ libc.src.__support.math.f16sqrt
)
diff --git a/libc/test/shared/shared_math_test.cpp b/libc/test/shared/shared_math_test.cpp
index 6b78de0281347..8e91acc7704a3 100644
--- a/libc/test/shared/shared_math_test.cpp
+++ b/libc/test/shared/shared_math_test.cpp
@@ -32,6 +32,7 @@ TEST(LlvmLibcSharedMathTest, AllFloat16) {
EXPECT_FP_EQ(0x0p+0f16, LIBC_NAMESPACE::shared::exp2m1f16(0.0f16));
EXPECT_FP_EQ(0x1p+0f16, LIBC_NAMESPACE::shared::expf16(0.0f16));
EXPECT_FP_EQ(0x0p+0f16, LIBC_NAMESPACE::shared::expm1f16(0.0f16));
+ EXPECT_FP_EQ(0x0p+0f16, LIBC_NAMESPACE::shared::f16sqrt(0.0f16));
ASSERT_FP_EQ(float16(8 << 5), LIBC_NAMESPACE::shared::ldexpf16(8.0f16, 5));
ASSERT_FP_EQ(float16(-1 * (8 << 5)),
diff --git a/utils/bazel/llvm-project-overlay/libc/BUILD.bazel b/utils/bazel/llvm-project-overlay/libc/BUILD.bazel
index 4251f20a5dfcf..86621b33a999d 100644
--- a/utils/bazel/llvm-project-overlay/libc/BUILD.bazel
+++ b/utils/bazel/llvm-project-overlay/libc/BUILD.bazel
@@ -3259,6 +3259,16 @@ libc_support_library(
],
)
+libc_support_library(
+ name = "__support_math_f16sqrt",
+ hdrs = ["src/__support/math/f16sqrt.h"],
+ deps = [
+ ":__support_common",
+ ":__support_fputil_generic_sqrt",
+ ":__support_macros_config",
+ ]
+)
+
############################### complex targets ################################
libc_function(
@@ -3977,7 +3987,7 @@ libc_math_function(name = "f16mull")
libc_math_function(
name = "f16sqrt",
additional_deps = [
- ":__support_fputil_sqrt",
+ ":__support_math_f16sqrt",
],
)
>From 0ac4d7f3a6b5a0431abe8cebd950eecd3e9ac7f9 Mon Sep 17 00:00:00 2001
From: Zhihui Yang <youngwisdm at gmail.com>
Date: Wed, 21 Jan 2026 05:41:09 -0800
Subject: [PATCH 2/2] format code
---
libc/shared/math.h | 2 +-
libc/src/math/generic/f16sqrt.cpp | 4 +---
2 files changed, 2 insertions(+), 4 deletions(-)
diff --git a/libc/shared/math.h b/libc/shared/math.h
index 59b3c1ccfc27a..4d782c5d39a56 100644
--- a/libc/shared/math.h
+++ b/libc/shared/math.h
@@ -58,6 +58,7 @@
#include "math/expm1.h"
#include "math/expm1f.h"
#include "math/expm1f16.h"
+#include "math/f16sqrt.h"
#include "math/frexpf.h"
#include "math/frexpf128.h"
#include "math/frexpf16.h"
@@ -69,7 +70,6 @@
#include "math/log.h"
#include "math/rsqrtf.h"
#include "math/rsqrtf16.h"
-#include "math/f16sqrt.h"
#include "math/sin.h"
#endif // LLVM_LIBC_SHARED_MATH_H
diff --git a/libc/src/math/generic/f16sqrt.cpp b/libc/src/math/generic/f16sqrt.cpp
index d33d51355bd39..17fac910af1af 100644
--- a/libc/src/math/generic/f16sqrt.cpp
+++ b/libc/src/math/generic/f16sqrt.cpp
@@ -10,7 +10,5 @@
#include "src/__support/math/f16sqrt.h"
namespace LIBC_NAMESPACE_DECL {
-LLVM_LIBC_FUNCTION(float16, f16sqrt, (double x)) {
- return math::f16sqrt(x);
-}
+LLVM_LIBC_FUNCTION(float16, f16sqrt, (double x)) { return math::f16sqrt(x); }
} // namespace LIBC_NAMESPACE_DECL
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