http://llvm.org/bugs/show_bug.cgi?id=19142
Bug ID: 19142
Summary: Implement __builtin___clear_cache and lower to
__clear_cache on ARM
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Backend: ARM
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Android uses the GCC intrinsic __builtin___clear_cache described here:
http://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html
To implement that in LLVM we'd have to add it in three steps:
1. Add support for clang to recognise __builtin___clear_cache and lower to some
intrinsic like @llvm.clear_cache
2. Add a LibCall to __clear_cache, but set it as noop by default (some targets
don't need it), and set it to __clear_cache on the targets that do support it.
3. Link @llvm.clear_cache to LibCall's __clear_cache.
As an extra, on ARM, would it be desired to lower the call to a sequence of
instructions (push r7, mov r7, #0xf0002, svc 0x0, pop r7), or is that a bit too
much optimisation?
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