[clang] [HLSL] Change clang Driver Options to not set CXXOperatorNames (PR #126758)

[Farzon Lotfi via cfe-commits]

https://github.com/farzonl created https://github.com/llvm/llvm-project/pull/126758

- Disable `CXXOperatorNames` for HLSL
- Add tests to confirm we can use the alt names as functions

>From 3b7e458bfeb2abab799789d30ebaa4b214e4168e Mon Sep 17 00:00:00 2001
From: Farzon Lotfi <farzonlotfi at microsoft.com>
Date: Tue, 11 Feb 2025 11:07:23 -0500
Subject: [PATCH] [HLSL] Change clang Driver Options to not set
 CXXOperatorNames

---
 clang/include/clang/Driver/Options.td         |  2 +-
 .../use-cxx-alt-operator-names.hlsl           | 41 +++++++++++++++++++
 2 files changed, 42 insertions(+), 1 deletion(-)
 create mode 100644 clang/test/CodeGenHLSL/use-cxx-alt-operator-names.hlsl

diff --git a/clang/include/clang/Driver/Options.td b/clang/include/clang/Driver/Options.td
index 1cf62ab46613456..618815db2843404 100644
--- a/clang/include/clang/Driver/Options.td
+++ b/clang/include/clang/Driver/Options.td
@@ -3397,7 +3397,7 @@ def fno_objc_weak : Flag<["-"], "fno-objc-weak">, Group<f_Group>,
 def fno_omit_frame_pointer : Flag<["-"], "fno-omit-frame-pointer">, Group<f_Group>,
   Visibility<[ClangOption, FlangOption]>;
 defm operator_names : BoolFOption<"operator-names",
-  LangOpts<"CXXOperatorNames">, Default<cplusplus.KeyPath>,
+  LangOpts<"CXXOperatorNames">, Default<!strconcat(cplusplus.KeyPath, " && !",hlsl.KeyPath)>,
   NegFlag<SetFalse, [], [ClangOption, CC1Option],
           "Do not treat C++ operator name keywords as synonyms for operators">,
   PosFlag<SetTrue>>;
diff --git a/clang/test/CodeGenHLSL/use-cxx-alt-operator-names.hlsl b/clang/test/CodeGenHLSL/use-cxx-alt-operator-names.hlsl
new file mode 100644
index 000000000000000..8ae253a9f3c06cb
--- /dev/null
+++ b/clang/test/CodeGenHLSL/use-cxx-alt-operator-names.hlsl
@@ -0,0 +1,41 @@
+
+// RUN: %clang_cc1 -finclude-default-header -x hlsl -triple \
+// RUN:   dxil-pc-shadermodel6.3-library %s  \
+// RUN:   -emit-llvm -disable-llvm-passes -o - | FileCheck %s
+
+// RUN: %clang_cc1 -finclude-default-header -x hlsl -triple \
+// RUN: spirv-unknown-vulkan-compute %s \
+// RUN: -emit-llvm -disable-llvm-passes -o - | FileCheck %s
+
+// CHECK-LABEL: and
+void and() {}
+
+// CHECK-LABEL: and_eq
+void and_eq() {}
+
+// CHECK-LABEL: bitand
+void bitand() {}
+
+// CHECK-LABEL: bitor
+void bitor() {}
+
+// CHECK-LABEL: compl
+void compl() {}
+
+// CHECK-LABEL: not
+void not() {}
+
+// CHECK-LABEL: not_eq
+void not_eq() {}
+
+// CHECK-LABEL: or
+void or() {}
+
+// CHECK-LABEL: or_eq
+void or_eq() {}
+
+// CHECK-LABEL: xor
+void xor() {}
+
+// CHECK-LABEL: xor_eq
+void xor_eq() {}