https://github.com/jhuber6 updated
https://github.com/llvm/llvm-project/pull/154227
>From fb6fc11a3f4687e45207f43e867b6cb46bf7b1cf Mon Sep 17 00:00:00 2001
From: Joseph Huber <hube...@outlook.com>
Date: Mon, 18 Aug 2025 18:36:57 -0500
Subject: [PATCH] [Clang] Add queryable feature 'boolean_vectors' for SIMD
masks
Summary:
We added boolean vectors in clang 15 and wish to extend them further in
clang-22. However, there's no way to query for their support as they are
separate to the normal extended vector type. This adds a feature so we
can check for it as a feature directly.
---
clang/docs/LanguageExtensions.rst | 3 ++-
clang/include/clang/Basic/Features.def | 1 +
clang/test/SemaCXX/vector-bool.cpp | 4 ++++
3 files changed, 7 insertions(+), 1 deletion(-)
diff --git a/clang/docs/LanguageExtensions.rst
b/clang/docs/LanguageExtensions.rst
index 97413588fea15..9c229b2d1c89a 100644
--- a/clang/docs/LanguageExtensions.rst
+++ b/clang/docs/LanguageExtensions.rst
@@ -635,11 +635,12 @@ C and C++. For example:
return v;
}
+
Boolean vectors are a Clang extension of the ext vector type. Boolean vectors
are intended, though not guaranteed, to map to vector mask registers. The size
parameter of a boolean vector type is the number of bits in the vector. The
boolean vector is dense and each bit in the boolean vector is one vector
-element.
+element. Query for this feature with
``__has_feature(ext_vector_type_boolean)``.
The semantics of boolean vectors borrows from C bit-fields with the following
differences:
diff --git a/clang/include/clang/Basic/Features.def
b/clang/include/clang/Basic/Features.def
index b9efc6a6a2e9d..f6df55bc3eb8c 100644
--- a/clang/include/clang/Basic/Features.def
+++ b/clang/include/clang/Basic/Features.def
@@ -128,6 +128,7 @@ FEATURE(attribute_overloadable, true)
FEATURE(attribute_unavailable_with_message, true)
FEATURE(attribute_unused_on_fields, true)
FEATURE(attribute_diagnose_if_objc, true)
+FEATURE(ext_vector_type_boolean, true)
FEATURE(blocks, LangOpts.Blocks)
FEATURE(c_thread_safety_attributes, true)
FEATURE(cxx_exceptions, LangOpts.CXXExceptions)
diff --git a/clang/test/SemaCXX/vector-bool.cpp
b/clang/test/SemaCXX/vector-bool.cpp
index cd638056f348b..0db04dcdb014f 100644
--- a/clang/test/SemaCXX/vector-bool.cpp
+++ b/clang/test/SemaCXX/vector-bool.cpp
@@ -112,3 +112,7 @@ void Sizeof() {
static_assert(sizeof(Bool195) == 32);
static_assert(sizeof(Bool257) == 64);
}
+
+#if !__has_feature(ext_vector_type_boolean)
+#error "FAIL"
+#endif
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