[LLVMbugs] [Bug 19837] New: Global named registers support for pointer types

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=19837

            Bug ID: 19837
           Summary: Global named registers support for pointer types
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: LLVM Codegen
          Assignee: unassignedclangbugs at nondot.org
          Reporter: renato.golin at linaro.org
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Pointer types are supposed to fit on the architecture registers, so it should
be reasonably safe to assume they're safe for named registers. The code below
asserts on Clang (Bad register type):

struct p4_Thread {
  struct {
    int len
  } word
};
register struct p4_Thread *p4TH asm("%r15");
fn1() {
  (*p4TH).word.len;
}

Not only we could add support for pointer types, but we *must* not assert on
bad register types. We should have an error on SemaDecl before it gets to
CGExpr, by checking the type of the register variable and emitting a proper
error.

Once this is accepted by Clang, it will fail on LLVM, since "%r15" is not in
the list of registers accepted. But that's a separate problem.

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