llvm-project

6d67794d - X86MCCodeEmitter: Work around gcc/value-range.cc bug in GCC 13.3.0

X86MCCodeEmitter: Work around gcc/value-range.cc bug in GCC 13.3.0 GCC 13.3.0 -O3 miscompiles the `getImmFixupKind` after commit c20379198c7fb66b9514d21ae1e07b0705e3e6fa (-O2 is good), leading to spurious unreachable failure. ``` % ninja -C /tmp/out/custom-gcc-13 llc && /tmp/out/custom-gcc-13/bin/llc llvm/test/CodeGen/X86/2008-08-06-RewriterBug.ll -mtriple=i686 ninja: Entering directory `/tmp/out/custom-gcc-13' ninja: no work to do. Unknown immediate size UNREACHABLE executed at /home/ray/llvm/llvm/lib/Target/X86/MCTargetDesc/X86BaseInfo.h:904! ``` The latest releases/gcc-13 branch contains the fix https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109934#c6 , resolving this miscompile. `Desc.TSFlags` works around the bug.