[llvm-branch-commits] [llvm] [clang] [clang] Function Multi Versioning supports IFunc lowerings on Darwin platforms (PR #73688)

[via llvm-branch-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Jon Roelofs (jroelofs)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/73688.diff


2 Files Affected:

- (modified) clang/include/clang/Basic/TargetInfo.h (+2) 
- (modified) clang/test/CodeGen/attr-target-mv-va-args.c (+19) 


``````````diff
diff --git a/clang/include/clang/Basic/TargetInfo.h b/clang/include/clang/Basic/TargetInfo.h
index 41f3c2e403cbef6..1fe2a18cd5dc9cc 100644
--- a/clang/include/clang/Basic/TargetInfo.h
+++ b/clang/include/clang/Basic/TargetInfo.h
@@ -1424,6 +1424,8 @@ class TargetInfo : public TransferrableTargetInfo,
 
   /// Identify whether this target supports IFuncs.
   bool supportsIFunc() const {
+    if (getTriple().isOSBinFormatMachO())
+      return true;
     return getTriple().isOSBinFormatELF() &&
            ((getTriple().isOSLinux() && !getTriple().isMusl()) ||
             getTriple().isOSFreeBSD());
diff --git a/clang/test/CodeGen/attr-target-mv-va-args.c b/clang/test/CodeGen/attr-target-mv-va-args.c
index 96821c610235bdc..dbf5a74205c4c19 100644
--- a/clang/test/CodeGen/attr-target-mv-va-args.c
+++ b/clang/test/CodeGen/attr-target-mv-va-args.c
@@ -3,6 +3,7 @@
 // RUN: %clang_cc1 -triple x86_64-windows-pc -emit-llvm %s -o - | FileCheck %s --check-prefixes=NO-IFUNC,WINDOWS
 // RUN: %clang_cc1 -triple x86_64-linux-musl -emit-llvm %s -o - | FileCheck %s --check-prefixes=NO-IFUNC,NO-IFUNC-ELF
 // RUN: %clang_cc1 -triple x86_64-fuchsia -emit-llvm %s -o - | FileCheck %s --check-prefixes=NO-IFUNC,NO-IFUNC-ELF
+// RUN: %clang_cc1 -triple x86_64-apple-macho -emit-llvm %s -o - | FileCheck %s --check-prefix=IFUNC-MACHO
 int __attribute__((target("sse4.2"))) foo(int i, ...) { return 0; }
 int __attribute__((target("arch=sandybridge"))) foo(int i, ...);
 int __attribute__((target("arch=ivybridge"))) foo(int i, ...) {return 1;}
@@ -30,6 +31,24 @@ int bar(void) {
 // IFUNC-ELF: ret ptr @foo
 // IFUNC-ELF: declare i32 @foo.arch_sandybridge(i32 noundef, ...)
 
+// IFUNC-MACHO: @foo.ifunc = weak_odr ifunc i32 (i32, ...), ptr @foo.resolver
+// IFUNC-MACHO: define{{.*}} i32 @foo.sse4.2(i32 noundef %i, ...)
+// IFUNC-MACHO: ret i32 0
+// IFUNC-MACHO: define{{.*}} i32 @foo.arch_ivybridge(i32 noundef %i, ...)
+// IFUNC-MACHO: ret i32 1
+// IFUNC-MACHO: define{{.*}} i32 @foo(i32 noundef %i, ...)
+// IFUNC-MACHO: ret i32 2
+// IFUNC-MACHO: define{{.*}} i32 @bar()
+// IFUNC-MACHO: call i32 (i32, ...) @foo.ifunc(i32 noundef 1, i32 noundef 97, double
+// IFUNC-MACHO: call i32 (i32, ...) @foo.ifunc(i32 noundef 2, double noundef 2.2{{[0-9Ee+]+}}, ptr noundef
+
+// IFUNC-MACHO: define weak_odr ptr @foo.resolver()
+// IFUNC-MACHO: ret ptr @foo.arch_sandybridge
+// IFUNC-MACHO: ret ptr @foo.arch_ivybridge
+// IFUNC-MACHO: ret ptr @foo.sse4.2
+// IFUNC-MACHO: ret ptr @foo
+// IFUNC-MACHO: declare i32 @foo.arch_sandybridge(i32 noundef, ...)
+
 // NO-IFUNC: define dso_local i32 @foo.sse4.2(i32 noundef %i, ...)
 // NO-IFUNC: ret i32 0
 // NO-IFUNC: define dso_local i32 @foo.arch_ivybridge(i32 noundef %i, ...)

``````````

</details>


https://github.com/llvm/llvm-project/pull/73688