http://llvm.org/bugs/show_bug.cgi?id=13617
Bug #: 13617
Summary: LLVM+Clang emits movw instrucionts with -march=armv6zk
Product: new-bugs
Version: trunk
Platform: All
OS/Version: All
Status: NEW
Severity: release blocker
Priority: P
Component: new bugs
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Classification: Unclassified
When specifying -march=armv6, LLVM still emits movw instructions. However,
those were introduced with armv7, thus the assembler aborts the commit. Without
-march=armv6, LLVM just emits them on my ARMv6 system, leading to SIGILL. The
same happens for other armv6 variants like armv6zk.
Basically this means LLVM currently can't compile code that works on an ARMv6
system, as it ignores everything telling it to not emit ARMv7 instructions. The
same happens for me with -mcpu=arm1176jzf-s, so there's absolutely no way to
disable the usage of the movw instruction, it seems.
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