[clang] [llvm] [mlir] IR: Promote "denormal-fp-math" to a first class attribute (PR #174293)

Thu Feb 5 06:23:22 PST 2026

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `clang-m68k-linux-cross` running on `suse-gary-m68k-cross` while building `clang,llvm,mlir` at step 5 "ninja check 1".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/27/builds/22683

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 5 (ninja check 1) failure: stage 1 checked (failure)
...
  158 |   bool isValid() const {
      |        ^~~~~~~
/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/include/llvm/ADT/FloatingPointMode.h: In member function ‘constexpr bool llvm::DenormalFPEnv::operator==(llvm::DenormalFPEnv) const’:
/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/include/llvm/ADT/FloatingPointMode.h:318:24: warning: call to non-‘constexpr’ function ‘bool llvm::DenormalMode::operator==(llvm::DenormalMode) const’ [-Winvalid-constexpr]
  318 |     return DefaultMode == Other.DefaultMode && F32Mode == Other.F32Mode;
      |            ~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~
/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/include/llvm/ADT/FloatingPointMode.h:146:8: note: ‘bool llvm::DenormalMode::operator==(llvm::DenormalMode) const’ declared here
  146 |   bool operator==(DenormalMode Other) const {
      |        ^~~~~~~~
[88/758] Building CXX object tools/clang/tools/extra/clangd/unittests/CMakeFiles/ClangdTests.dir/CodeCompleteTests.cpp.o
FAILED: tools/clang/tools/extra/clangd/unittests/CMakeFiles/ClangdTests.dir/CodeCompleteTests.cpp.o 
/usr/bin/c++ -DLLVM_BUILD_STATIC -D_DEBUG -D_GLIBCXX_ASSERTIONS -D_GLIBCXX_USE_CXX11_ABI=1 -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/tools/clang/tools/extra/clangd/unittests -I/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/clang-tools-extra/clangd/unittests -I/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/clang-tools-extra/clangd/../include-cleaner/include -I/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/tools/clang/tools/extra/clangd/../clang-tidy -I/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/clang/include -I/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/tools/clang/include -I/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/include -I/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/include -I/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/clang-tools-extra/clangd -I/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/tools/clang/tools/extra/clangd -I/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/third-party/unittest/googletest/include -I/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/third-party/unittest/googlemock/include -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wno-missing-field-initializers -pedantic -Wno-long-long -Wimplicit-fallthrough -Wno-uninitialized -Wno-nonnull -Wno-class-memaccess -Wno-dangling-reference -Wno-redundant-move -Wno-pessimizing-move -Wno-array-bounds -Wno-stringop-overread -Wno-noexcept-type -Wdelete-non-virtual-dtor -Wsuggest-override -Wno-comment -Wno-misleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -fno-common -Woverloaded-virtual -O3 -DNDEBUG -std=c++17 -UNDEBUG -Wno-variadic-macros -fno-exceptions -funwind-tables -fno-rtti -Wno-suggest-override -MD -MT tools/clang/tools/extra/clangd/unittests/CMakeFiles/ClangdTests.dir/CodeCompleteTests.cpp.o -MF tools/clang/tools/extra/clangd/unittests/CMakeFiles/ClangdTests.dir/CodeCompleteTests.cpp.o.d -o tools/clang/tools/extra/clangd/unittests/CMakeFiles/ClangdTests.dir/CodeCompleteTests.cpp.o -c /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/clang-tools-extra/clangd/unittests/CodeCompleteTests.cpp
In file included from /usr/include/c++/14/cassert:44,
                 from /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/include/llvm/ADT/BitmaskEnum.h:12,
                 from /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/include/llvm/ADT/FloatingPointMode.h:18,
                 from /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/clang/include/clang/Basic/LangOptions.h:25,
                 from /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/clang-tools-extra/clangd/SourceCode.h:21,
                 from /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/clang-tools-extra/clangd/CollectMacros.h:13,
                 from /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/clang-tools-extra/clangd/ParsedAST.h:23,
                 from /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/clang-tools-extra/clangd/ASTSignals.h:12,
                 from /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/clang-tools-extra/clangd/unittests/CodeCompleteTests.cpp:9:
/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/include/llvm/ADT/FloatingPointMode.h: In member function ‘constexpr uint32_t llvm::DenormalFPEnv::toIntValue() const’:
/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/include/llvm/ADT/FloatingPointMode.h:304:31: warning: call to non-‘constexpr’ function ‘bool llvm::DenormalMode::isValid() const’ [-Winvalid-constexpr]
  304 |     assert(DefaultMode.isValid() && F32Mode.isValid());
      |            ~~~~~~~~~~~~~~~~~~~^~
/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/include/llvm/ADT/FloatingPointMode.h:158:8: note: ‘bool llvm::DenormalMode::isValid() const’ declared here
  158 |   bool isValid() const {
      |        ^~~~~~~
/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/include/llvm/ADT/FloatingPointMode.h: In member function ‘constexpr bool llvm::DenormalFPEnv::operator==(llvm::DenormalFPEnv) const’:
/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/include/llvm/ADT/FloatingPointMode.h:318:24: warning: call to non-‘constexpr’ function ‘bool llvm::DenormalMode::operator==(llvm::DenormalMode) const’ [-Winvalid-constexpr]
  318 |     return DefaultMode == Other.DefaultMode && F32Mode == Other.F32Mode;
      |            ~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~
/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/include/llvm/ADT/FloatingPointMode.h:146:8: note: ‘bool llvm::DenormalMode::operator==(llvm::DenormalMode) const’ declared here
  146 |   bool operator==(DenormalMode Other) const {
      |        ^~~~~~~~
c++: fatal error: Killed signal terminated program cc1plus
compilation terminated.
[89/758] Building CXX object tools/clang/tools/extra/clangd/unittests/CMakeFiles/ClangdTests.dir/SemanticSelectionTests.cpp.o
In file included from /usr/include/c++/14/cassert:44,
                 from /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/include/llvm/ADT/BitmaskEnum.h:12,
                 from /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/include/llvm/ADT/FloatingPointMode.h:18,
                 from /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/clang/include/clang/Basic/LangOptions.h:25,
                 from /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/clang-tools-extra/clangd/SourceCode.h:21,
                 from /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/clang-tools-extra/clangd/CollectMacros.h:13,
                 from /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/clang-tools-extra/clangd/ParsedAST.h:23,
                 from /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/clang-tools-extra/clangd/ASTSignals.h:12,
                 from /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/clang-tools-extra/clangd/CodeComplete.h:18,
                 from /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/clang-tools-extra/clangd/ClangdServer.h:12,
                 from /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/clang-tools-extra/clangd/unittests/SemanticSelectionTests.cpp:10:

```

</details>

https://github.com/llvm/llvm-project/pull/174293