[compiler-rt] compiler-rt/arm: Check for overflow when adding float denorms (PR #185245)

[via llvm-commits]

github-actions[bot] wrote:

<!--PREMERGE ADVISOR COMMENT: Windows-->
# :window: Windows x64 Test Results

* 1616 tests passed
* 1332 tests skipped
* 1 test failed

## Failed Tests
(click on a test name to see its output)

### Builtins-x86_64-windows
<details>
<summary>Builtins-x86_64-windows.Builtins-x86_64-windows/addsf3_test.c</summary>

```
Exit Code: 1

Command Output (stdout):
--
# RUN: at line 5
C:/_work/llvm-project/llvm-project/build/./bin/clang.exe   -gline-tables-only -gcodeview -gcolumn-info  -DCOMPILER_RT_HAS_FLOAT16  -fno-builtin -I C:/_work/llvm-project/llvm-project/compiler-rt\lib\builtins -nodefaultlibs C:\_work\llvm-project\llvm-project\compiler-rt\test\builtins\Unit\addsf3_test.c C:/_work/llvm-project/llvm-project/build/./lib/../lib/clang/23/lib/windows\clang_rt.builtins-x86_64.lib -o C:\_work\llvm-project\llvm-project\build\runtimes\runtimes-bins\compiler-rt\test\builtins\Unit\X86_64WindowsConfig\Output\addsf3_test.c.tmp &&  C:\_work\llvm-project\llvm-project\build\runtimes\runtimes-bins\compiler-rt\test\builtins\Unit\X86_64WindowsConfig\Output\addsf3_test.c.tmp
# executed command: C:/_work/llvm-project/llvm-project/build/./bin/clang.exe -gline-tables-only -gcodeview -gcolumn-info -DCOMPILER_RT_HAS_FLOAT16 -fno-builtin -I 'C:/_work/llvm-project/llvm-project/compiler-rt\lib\builtins' -nodefaultlibs 'C:\_work\llvm-project\llvm-project\compiler-rt\test\builtins\Unit\addsf3_test.c' 'C:/_work/llvm-project/llvm-project/build/./lib/../lib/clang/23/lib/windows\clang_rt.builtins-x86_64.lib' -o 'C:\_work\llvm-project\llvm-project\build\runtimes\runtimes-bins\compiler-rt\test\builtins\Unit\X86_64WindowsConfig\Output\addsf3_test.c.tmp'
# .---command stderr------------
# | C:\_work\llvm-project\llvm-project\compiler-rt\test\builtins\Unit\addsf3_test.c:15:1: error: unknown type name 'COMPILER_RT_ABI'
# |    15 | COMPILER_RT_ABI float __addsf3(float a, float b);
# |       | ^
# | 1 error generated.
# `-----------------------------
# error: command failed with exit status: 1

--

```
</details>

If these failures are unrelated to your changes (for example tests are broken or flaky at HEAD), please open an issue at https://github.com/llvm/llvm-project/issues and add the `infrastructure` label.

https://github.com/llvm/llvm-project/pull/185245