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Makefiles: Set Clang CPP compiler flags in a single location, instead of scattered throughout the project Makefiles.

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 - This eliminates most dependencies on how Clang is installed relative to LLVM.

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warnings, from Troy Straszheim! Fixes PR6163.


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Clang can load it as a plugin. Original fix by Troy D. Straszheim,
which I extended with Darwin support. Fixes PR6801.


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copy-in of c++ class objects into blocks.


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pointer. Original patch by Troy D. Straszheim; fixes PR7283.


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When checking whether we can place a base subobject at an offset, we don't need to go past the highest offset that's known to contain an empty base subobject.

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the function call is left where the local variable is declared.


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Fix NEON intrinsic argument passing, support vext.  Most now successfully make it through codegen to the .s file


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Since the enum values for each arch's builtins overlap, it is not appropriate to check them when compiling or other archs.  Fixes a problem where compiling for NEON would use x86 sema rules.


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ARM.

Fixes PR7310.

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Extend __builtin_shufflevector to expose the full power of the llvm shufflevector instruction.  This means it can now be used for vector truncation and concatenation.  This will be used for the ARM NEON implementation.


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 - We actually pretend that we have two separate types for LLVM assembly/bitcode because we need to use the standard suffixes with LTO ('clang -O4 -c t.c' should generate 't.o').

It is now possible to do something like:
  $ clang -emit-llvm -S t.c -o t.ll ... assorted other compile flags ...
  $ clang -c t.ll -o t.o ... assorted other compile flags ...
and expect that the output will be almost* identical to:
  $ clang -c t.c -o t.o ... assorted other compile flags ...
because all the target settings (default CPU, target features, etc.) will all be initialized properly by the driver/frontend.

*: This isn't perfect yet, because in practice we will end up running the optimization passes twice. It's possible to get something equivalent out with a well placed -mllvm -disable-llvm-optzns, but I'm still thinking about the cleanest way to solve this problem more generally.

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and 'llvm-dis' is:  $ clang -cc1 -emit-llvm    FOO.bc -o -
and 'opt' is, e.g.:
  $ clang -cc1 -emit-llvm -O3 -o FOO.opt.ll FOO.ll
and 'llc' is, e.g.:
  $ clang -cc1 -S -o - FOO.ll

The nice thing about using the backend tools this way is that they are guaranteed to exactly match how the compiler generates code (for example, setting the same backend options).

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 - These inputs follow an abbreviated execution path, but are still worth handling by FrontendAction so they reuse all the other clang -cc1 features.

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Frontend: Move some initialization from CompilerInstance to FrontendAction, to parallel what is done for AST inputs.

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create modules which have target data strings.

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Frontend: Add CodeGenOptions::SimplifyLibCalls, and eliminate LangOptions argument to BackendConsumer.

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type of rhs need be compared to setter's argument and
not the getter type. Fixes radar 8062778


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an existing ir for load of a bock variable. This cannot be
done across basic blocks.
Fixes radar 8064140.


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Catch free()s on non-regions and regions known to be not from malloc(), by checking the symbol type and memory space.



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