[libc] add shared divsf3 builtin by hulxv · Pull Request #205679 · llvm/llvm-project

hulxv · 2026-06-24T21:03:32Z

Re-exposes LLVM-libc's __divsf3 as shared::divsf3 for reuse by compiler-rt's builtins.

Stacked change - merge these first:

Part of #197824

github-actions · 2026-06-25T17:16:16Z

🪟 Windows x64 Test Results

126699 tests passed
2993 tests skipped

✅ The build succeeded and all tests passed.

llvmorg-github-actions · 2026-06-28T00:36:44Z

@llvm/pr-subscribers-libc

Author: hulxv (hulxv)

Changes

Re-exposes LLVM-libc's __divsf3 as shared::divsf3 for reuse by compiler-rt's builtins.

Stacked change - merge these first:

#200094
#205669
#205670
#205671
#205672
#205673
#205674
#205675
#205676
#205677
#205678

Part of #197824

Patch is 21.12 KiB, truncated to 20.00 KiB below, full version: https://github.com/llvm/llvm-project/pull/205679.diff

18 Files Affected:

(modified) libc/shared/builtins.h (+7)
(added) libc/shared/builtins/addsf3.h (+29)
(added) libc/shared/builtins/divdf3.h (+29)
(added) libc/shared/builtins/divsf3.h (+29)
(added) libc/shared/builtins/muldf3.h (+29)
(added) libc/shared/builtins/mulsf3.h (+29)
(added) libc/shared/builtins/subdf3.h (+29)
(added) libc/shared/builtins/subsf3.h (+29)
(modified) libc/src/__support/builtins/CMakeLists.txt (+63)
(added) libc/src/__support/builtins/addsf3.h (+32)
(added) libc/src/__support/builtins/divdf3.h (+32)
(added) libc/src/__support/builtins/divsf3.h (+32)
(added) libc/src/__support/builtins/muldf3.h (+32)
(added) libc/src/__support/builtins/mulsf3.h (+32)
(added) libc/src/__support/builtins/subdf3.h (+32)
(added) libc/src/__support/builtins/subsf3.h (+32)
(modified) libc/test/shared/CMakeLists.txt (+7)
(modified) libc/test/shared/shared_builtins_test.cpp (+7-1)

diff --git a/libc/shared/builtins.h b/libc/shared/builtins.h
index dca0171c02d18..ced054cb02582 100644
--- a/libc/shared/builtins.h
+++ b/libc/shared/builtins.h
@@ -18,9 +18,16 @@
 #include "libc_common.h"
 
 #include "builtins/adddf3.h"
+#include "builtins/addsf3.h"
 #include "builtins/addtf3.h"
+#include "builtins/divdf3.h"
+#include "builtins/divsf3.h"
 #include "builtins/divtf3.h"
+#include "builtins/muldf3.h"
+#include "builtins/mulsf3.h"
 #include "builtins/multf3.h"
+#include "builtins/subdf3.h"
+#include "builtins/subsf3.h"
 #include "builtins/subtf3.h"
 
 #endif // LLVM_LIBC_SHARED_BUILTINS_H
diff --git a/libc/shared/builtins/addsf3.h b/libc/shared/builtins/addsf3.h
new file mode 100644
index 0000000000000..58f8797d93705
--- /dev/null
+++ b/libc/shared/builtins/addsf3.h
@@ -0,0 +1,29 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+/// This header exposes LLVM-libc's __addsf3 implementation as shared::addsf3 so
+/// that it can be reused by compiler-rt's builtins.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SHARED_BUILTINS_ADDSF3_H
+#define LLVM_LIBC_SHARED_BUILTINS_ADDSF3_H
+
+#include "shared/libc_common.h"
+#include "src/__support/builtins/addsf3.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace shared {
+
+using builtins::addsf3;
+
+} // namespace shared
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SHARED_BUILTINS_ADDSF3_H
diff --git a/libc/shared/builtins/divdf3.h b/libc/shared/builtins/divdf3.h
new file mode 100644
index 0000000000000..4cabc847b7a02
--- /dev/null
+++ b/libc/shared/builtins/divdf3.h
@@ -0,0 +1,29 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+/// This header exposes LLVM-libc's __divdf3 implementation as shared::divdf3 so
+/// that it can be reused by compiler-rt's builtins.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SHARED_BUILTINS_DIVDF3_H
+#define LLVM_LIBC_SHARED_BUILTINS_DIVDF3_H
+
+#include "shared/libc_common.h"
+#include "src/__support/builtins/divdf3.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace shared {
+
+using builtins::divdf3;
+
+} // namespace shared
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SHARED_BUILTINS_DIVDF3_H
diff --git a/libc/shared/builtins/divsf3.h b/libc/shared/builtins/divsf3.h
new file mode 100644
index 0000000000000..edb6aec227760
--- /dev/null
+++ b/libc/shared/builtins/divsf3.h
@@ -0,0 +1,29 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+/// This header exposes LLVM-libc's __divsf3 implementation as shared::divsf3 so
+/// that it can be reused by compiler-rt's builtins.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SHARED_BUILTINS_DIVSF3_H
+#define LLVM_LIBC_SHARED_BUILTINS_DIVSF3_H
+
+#include "shared/libc_common.h"
+#include "src/__support/builtins/divsf3.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace shared {
+
+using builtins::divsf3;
+
+} // namespace shared
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SHARED_BUILTINS_DIVSF3_H
diff --git a/libc/shared/builtins/muldf3.h b/libc/shared/builtins/muldf3.h
new file mode 100644
index 0000000000000..702c73428e5f4
--- /dev/null
+++ b/libc/shared/builtins/muldf3.h
@@ -0,0 +1,29 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+/// This header exposes LLVM-libc's __muldf3 implementation as shared::muldf3 so
+/// that it can be reused by compiler-rt's builtins.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SHARED_BUILTINS_MULDF3_H
+#define LLVM_LIBC_SHARED_BUILTINS_MULDF3_H
+
+#include "shared/libc_common.h"
+#include "src/__support/builtins/muldf3.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace shared {
+
+using builtins::muldf3;
+
+} // namespace shared
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SHARED_BUILTINS_MULDF3_H
diff --git a/libc/shared/builtins/mulsf3.h b/libc/shared/builtins/mulsf3.h
new file mode 100644
index 0000000000000..b0b24b1b2e620
--- /dev/null
+++ b/libc/shared/builtins/mulsf3.h
@@ -0,0 +1,29 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+/// This header exposes LLVM-libc's __mulsf3 implementation as shared::mulsf3 so
+/// that it can be reused by compiler-rt's builtins.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SHARED_BUILTINS_MULSF3_H
+#define LLVM_LIBC_SHARED_BUILTINS_MULSF3_H
+
+#include "shared/libc_common.h"
+#include "src/__support/builtins/mulsf3.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace shared {
+
+using builtins::mulsf3;
+
+} // namespace shared
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SHARED_BUILTINS_MULSF3_H
diff --git a/libc/shared/builtins/subdf3.h b/libc/shared/builtins/subdf3.h
new file mode 100644
index 0000000000000..8cff7e3bfa28f
--- /dev/null
+++ b/libc/shared/builtins/subdf3.h
@@ -0,0 +1,29 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+/// This header exposes LLVM-libc's __subdf3 implementation as shared::subdf3 so
+/// that it can be reused by compiler-rt's builtins.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SHARED_BUILTINS_SUBDF3_H
+#define LLVM_LIBC_SHARED_BUILTINS_SUBDF3_H
+
+#include "shared/libc_common.h"
+#include "src/__support/builtins/subdf3.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace shared {
+
+using builtins::subdf3;
+
+} // namespace shared
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SHARED_BUILTINS_SUBDF3_H
diff --git a/libc/shared/builtins/subsf3.h b/libc/shared/builtins/subsf3.h
new file mode 100644
index 0000000000000..3f92aa1c2828c
--- /dev/null
+++ b/libc/shared/builtins/subsf3.h
@@ -0,0 +1,29 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+/// This header exposes LLVM-libc's __subsf3 implementation as shared::subsf3 so
+/// that it can be reused by compiler-rt's builtins.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SHARED_BUILTINS_SUBSF3_H
+#define LLVM_LIBC_SHARED_BUILTINS_SUBSF3_H
+
+#include "shared/libc_common.h"
+#include "src/__support/builtins/subsf3.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace shared {
+
+using builtins::subsf3;
+
+} // namespace shared
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SHARED_BUILTINS_SUBSF3_H
diff --git a/libc/src/__support/builtins/CMakeLists.txt b/libc/src/__support/builtins/CMakeLists.txt
index dee5a830b8857..f5b5ffe3e07b4 100644
--- a/libc/src/__support/builtins/CMakeLists.txt
+++ b/libc/src/__support/builtins/CMakeLists.txt
@@ -46,3 +46,66 @@ add_header_library(
     libc.src.__support.FPUtil.generic.add_sub
     libc.src.__support.macros.config
 )
+
+add_header_library(
+  subdf3
+  HDRS
+    subdf3.h
+  DEPENDS
+    libc.src.__support.FPUtil.generic.add_sub
+    libc.src.__support.macros.config
+)
+
+add_header_library(
+  muldf3
+  HDRS
+    muldf3.h
+  DEPENDS
+    libc.src.__support.FPUtil.generic.mul
+    libc.src.__support.macros.config
+)
+
+add_header_library(
+  divdf3
+  HDRS
+    divdf3.h
+  DEPENDS
+    libc.src.__support.FPUtil.generic.div
+    libc.src.__support.macros.config
+)
+
+add_header_library(
+  addsf3
+  HDRS
+    addsf3.h
+  DEPENDS
+    libc.src.__support.FPUtil.generic.add_sub
+    libc.src.__support.macros.config
+)
+
+add_header_library(
+  subsf3
+  HDRS
+    subsf3.h
+  DEPENDS
+    libc.src.__support.FPUtil.generic.add_sub
+    libc.src.__support.macros.config
+)
+
+add_header_library(
+  mulsf3
+  HDRS
+    mulsf3.h
+  DEPENDS
+    libc.src.__support.FPUtil.generic.mul
+    libc.src.__support.macros.config
+)
+
+add_header_library(
+  divsf3
+  HDRS
+    divsf3.h
+  DEPENDS
+    libc.src.__support.FPUtil.generic.div
+    libc.src.__support.macros.config
+)
diff --git a/libc/src/__support/builtins/addsf3.h b/libc/src/__support/builtins/addsf3.h
new file mode 100644
index 0000000000000..5fa55e30dd0c6
--- /dev/null
+++ b/libc/src/__support/builtins/addsf3.h
@@ -0,0 +1,32 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+/// This header exposes LLVM-libc's __addsf3 implementation as builtins::addsf3
+/// so that it can be reused by compiler-rt's builtins.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_BUILTINS_ADDSF3_H
+#define LLVM_LIBC_SRC___SUPPORT_BUILTINS_ADDSF3_H
+
+#include "src/__support/FPUtil/generic/add_sub.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace builtins {
+
+// Addition at float precision; mirrors compiler-rt's __addsf3.
+LIBC_INLINE float addsf3(float x, float y) {
+  return fputil::generic::add<float>(x, y);
+}
+
+} // namespace builtins
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_BUILTINS_ADDSF3_H
diff --git a/libc/src/__support/builtins/divdf3.h b/libc/src/__support/builtins/divdf3.h
new file mode 100644
index 0000000000000..b9af2252be389
--- /dev/null
+++ b/libc/src/__support/builtins/divdf3.h
@@ -0,0 +1,32 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+/// This header exposes LLVM-libc's __divdf3 implementation as builtins::divdf3
+/// so that it can be reused by compiler-rt's builtins.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_BUILTINS_DIVDF3_H
+#define LLVM_LIBC_SRC___SUPPORT_BUILTINS_DIVDF3_H
+
+#include "src/__support/FPUtil/generic/div.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace builtins {
+
+// Division at double precision; mirrors compiler-rt's __divdf3.
+LIBC_INLINE double divdf3(double x, double y) {
+  return fputil::generic::div<double>(x, y);
+}
+
+} // namespace builtins
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_BUILTINS_DIVDF3_H
diff --git a/libc/src/__support/builtins/divsf3.h b/libc/src/__support/builtins/divsf3.h
new file mode 100644
index 0000000000000..681b705f9e666
--- /dev/null
+++ b/libc/src/__support/builtins/divsf3.h
@@ -0,0 +1,32 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+/// This header exposes LLVM-libc's __divsf3 implementation as builtins::divsf3
+/// so that it can be reused by compiler-rt's builtins.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_BUILTINS_DIVSF3_H
+#define LLVM_LIBC_SRC___SUPPORT_BUILTINS_DIVSF3_H
+
+#include "src/__support/FPUtil/generic/div.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace builtins {
+
+// Division at float precision; mirrors compiler-rt's __divsf3.
+LIBC_INLINE float divsf3(float x, float y) {
+  return fputil::generic::div<float>(x, y);
+}
+
+} // namespace builtins
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_BUILTINS_DIVSF3_H
diff --git a/libc/src/__support/builtins/muldf3.h b/libc/src/__support/builtins/muldf3.h
new file mode 100644
index 0000000000000..b407b96ef90b4
--- /dev/null
+++ b/libc/src/__support/builtins/muldf3.h
@@ -0,0 +1,32 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+/// This header exposes LLVM-libc's __muldf3 implementation as builtins::muldf3
+/// so that it can be reused by compiler-rt's builtins.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_BUILTINS_MULDF3_H
+#define LLVM_LIBC_SRC___SUPPORT_BUILTINS_MULDF3_H
+
+#include "src/__support/FPUtil/generic/mul.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace builtins {
+
+// Multiplication at double precision; mirrors compiler-rt's __muldf3.
+LIBC_INLINE double muldf3(double x, double y) {
+  return fputil::generic::mul<double>(x, y);
+}
+
+} // namespace builtins
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_BUILTINS_MULDF3_H
diff --git a/libc/src/__support/builtins/mulsf3.h b/libc/src/__support/builtins/mulsf3.h
new file mode 100644
index 0000000000000..d1fef264d945a
--- /dev/null
+++ b/libc/src/__support/builtins/mulsf3.h
@@ -0,0 +1,32 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+/// This header exposes LLVM-libc's __mulsf3 implementation as builtins::mulsf3
+/// so that it can be reused by compiler-rt's builtins.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_BUILTINS_MULSF3_H
+#define LLVM_LIBC_SRC___SUPPORT_BUILTINS_MULSF3_H
+
+#include "src/__support/FPUtil/generic/mul.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace builtins {
+
+// Multiplication at float precision; mirrors compiler-rt's __mulsf3.
+LIBC_INLINE float mulsf3(float x, float y) {
+  return fputil::generic::mul<float>(x, y);
+}
+
+} // namespace builtins
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_BUILTINS_MULSF3_H
diff --git a/libc/src/__support/builtins/subdf3.h b/libc/src/__support/builtins/subdf3.h
new file mode 100644
index 0000000000000..5e704aa714af6
--- /dev/null
+++ b/libc/src/__support/builtins/subdf3.h
@@ -0,0 +1,32 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+/// This header exposes LLVM-libc's __subdf3 implementation as builtins::subdf3
+/// so that it can be reused by compiler-rt's builtins.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_BUILTINS_SUBDF3_H
+#define LLVM_LIBC_SRC___SUPPORT_BUILTINS_SUBDF3_H
+
+#include "src/__support/FPUtil/generic/add_sub.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace builtins {
+
+// Subtraction at double precision; mirrors compiler-rt's __subdf3.
+LIBC_INLINE double subdf3(double x, double y) {
+  return fputil::generic::sub<double>(x, y);
+}
+
+} // namespace builtins
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_BUILTINS_SUBDF3_H
diff --git a/libc/src/__support/builtins/subsf3.h b/libc/src/__support/builtins/subsf3.h
new file mode 100644
index 0000000000000..e45c8ce43a896
--- /dev/null
+++ b/libc/src/__support/builtins/subsf3.h
@@ -0,0 +1,32 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+/// This header exposes LLVM-libc's __subsf3 implementation as builtins::subsf3
+/// so that it can be reused by compiler-rt's builtins.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_BUILTINS_SUBSF3_H
+#define LLVM_LIBC_SRC___SUPPORT_BUILTINS_SUBSF3_H
+
+#include "src/__support/FPUtil/generic/add_sub.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace builtins {
+
+// Subtraction at float precision; mirrors compiler-rt's __subsf3.
+LIBC_INLINE float subsf3(float x, float y) {
+  return fputil::generic::sub<float>(x, y);
+}
+
+} // namespace builtins
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_BUILTINS_SUBSF3_H
diff --git a/libc/test/shared/CMakeLists.txt b/libc/test/shared/CMakeLists.txt
index 120524bed5ead..6efe8365b1557 100644
--- a/libc/test/shared/CMakeLists.txt
+++ b/libc/test/shared/CMakeLists.txt
@@ -828,9 +828,16 @@ add_fp_unittest(
     shared_builtins_test.cpp
   DEPENDS
     libc.src.__support.builtins.adddf3
+    libc.src.__support.builtins.addsf3
     libc.src.__support.builtins.addtf3
+    libc.src.__support.builtins.divdf3
+    libc.src.__support.builtins.divsf3
     libc.src.__support.builtins.divtf3
+    libc.src.__support.builtins.muldf3
+    libc.src.__support.builtins.mulsf3
     libc.src.__supp...
[truncated]

hulxv requested a review from a team as a code owner June 24, 2026 21:03

hulxv requested review from bassiounix, lntue and michaelrj-google June 24, 2026 21:03

hulxv force-pushed the libc/feat/builtins/divsf3 branch from a2d0605 to c6392b6 Compare June 25, 2026 16:17

hulxv force-pushed the libc/feat/builtins/divsf3 branch from 90f4d56 to a9dacdd Compare June 26, 2026 20:02

hulxv added 7 commits June 28, 2026 03:20

[libc] add shared subdf3 builtin

f33671a

[libc] add shared muldf3 builtin

ee486a5

[libc] add shared divdf3 builtin

91de782

[libc] add shared addsf3 builtin

332c690

[libc] add shared subsf3 builtin

dc6a7e2

[libc] add shared mulsf3 builtin

5c9384d

[libc] add shared divsf3 builtin

a3d41b6

hulxv force-pushed the libc/feat/builtins/divsf3 branch from a9dacdd to a3d41b6 Compare June 28, 2026 00:21

llvmorg-github-actions Bot added the libc label Jun 28, 2026

hulxv added 3 commits July 4, 2026 23:13

Merge branch 'main' into libc/feat/builtins/divsf3

77b2e46

Merge branch 'main' into libc/feat/builtins/divsf3

0582331

Merge branch 'main' into libc/feat/builtins/divsf3

84b1f46

michaelrj-google approved these changes Jul 7, 2026

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bassiounix approved these changes Jul 8, 2026

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hulxv merged commit 232f98e into llvm:main Jul 9, 2026
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[libc] add shared divsf3 builtin - #205679

[libc] add shared divsf3 builtin#205679
hulxv merged 10 commits into
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hulxv commented Jun 24, 2026 •

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