[LLVMbugs] [Bug 20360] New: ARM builtins library has incompatible assembly

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Fri Jul 18 10:26:16 PDT 2014


            Bug ID: 20360
           Summary: ARM builtins library has incompatible assembly
           Product: compiler-rt
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: compiler-rt
          Assignee: unassignedbugs at nondot.org
          Reporter: sgundapa at codeaurora.org
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

The $COMPILER_RT_SRC_DIR/lib/builtins/arm/sync-ops.h has assembly with a
backward branch on CBNZ instruction which is wrong on ARMv62T and above.

The ARM manual on CBNZ says backward branching is not possible.
Refer to

The integrated-as compiles this file with out an issue due to the bug 

Also, the lib/builtins/CMakeLists.txt has an issue that is not compiling the .S

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