[llvm] InstCombine: Preserve flags when simplifying exp (PR #174078)

[via llvm-commits]

github-actions[bot] wrote:

<!--PREMERGE ADVISOR COMMENT: Linux-->
# :penguin: Linux x64 Test Results

The build failed before running any tests. Click on a failure below to see the details.

<details>
<summary>lib/Transforms/InstCombine/CMakeFiles/LLVMInstCombine.dir/InstCombineSimplifyDemanded.cpp.o</summary>

```
FAILED: lib/Transforms/InstCombine/CMakeFiles/LLVMInstCombine.dir/InstCombineSimplifyDemanded.cpp.o
sccache /opt/llvm/bin/clang++ -DGTEST_HAS_RTTI=0 -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/home/gha/actions-runner/_work/llvm-project/llvm-project/build/lib/Transforms/InstCombine -I/home/gha/actions-runner/_work/llvm-project/llvm-project/llvm/lib/Transforms/InstCombine -I/home/gha/actions-runner/_work/llvm-project/llvm-project/build/include -I/home/gha/actions-runner/_work/llvm-project/llvm-project/llvm/include -gmlt -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror -Werror=date-time -Werror=unguarded-availability-new -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -pedantic -Wno-long-long -Wc++98-compat-extra-semi -Wimplicit-fallthrough -Wcovered-switch-default -Wno-noexcept-type -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wstring-conversion -Wno-pass-failed -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -O3 -DNDEBUG -std=c++17 -UNDEBUG -fno-exceptions -funwind-tables -fno-rtti -MD -MT lib/Transforms/InstCombine/CMakeFiles/LLVMInstCombine.dir/InstCombineSimplifyDemanded.cpp.o -MF lib/Transforms/InstCombine/CMakeFiles/LLVMInstCombine.dir/InstCombineSimplifyDemanded.cpp.o.d -o lib/Transforms/InstCombine/CMakeFiles/LLVMInstCombine.dir/InstCombineSimplifyDemanded.cpp.o -c /home/gha/actions-runner/_work/llvm-project/llvm-project/llvm/lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp
/home/gha/actions-runner/_work/llvm-project/llvm-project/llvm/lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp:2176:65: error: use of undeclared identifier 'FMF'
2176 |                                      ConstantFP::get(VTy, 1.0), FMF);
|                                                                 ^~~
/home/gha/actions-runner/_work/llvm-project/llvm-project/llvm/lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp:2188:66: error: use of undeclared identifier 'FMF'
2188 |             FCmpInst::FCMP_UEQ, X, ConstantFP::getInfinity(VTy), FMF);
|                                                                  ^~~
/home/gha/actions-runner/_work/llvm-project/llvm-project/llvm/lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp:2190:66: error: use of undeclared identifier 'FMF'
2190 |                                        ConstantFP::getZero(VTy), FMF);
|                                                                  ^~~
3 errors generated.
```
</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/174078