http://llvm.org/bugs/show_bug.cgi?id=20360
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: [email protected]
Reporter: [email protected]
CC: [email protected]
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
http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0489c/Cjaghefc.html
The integrated-as compiles this file with out an issue due to the bug
http://llvm.org/bugs/show_bug.cgi?id=20359
Also, the lib/builtins/CMakeLists.txt has an issue that is not compiling the .S
files.
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