[LLVMbugs] [Bug 23114] New: Usage of attribute address_space causes error in backend

[bugzilla-daemon at llvm.org]

https://llvm.org/bugs/show_bug.cgi?id=23114

            Bug ID: 23114
           Summary: Usage of attribute address_space causes error in
                    backend
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: LLVM Codegen
          Assignee: unassignedclangbugs at nondot.org
          Reporter: svenk.public at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 14144
  --> https://llvm.org/bugs/attachment.cgi?id=14144&action=edit
run script

Casting to a pointer with the 'address_space' attribute causes a fatal error in
the backend.

Error message:
fatal error: error in backend: Cannot select: 0x38752a0: i64 = addrspacecast
      0x3875190[0 -> 257] [ORD=8] [ID=12]
  0x3875190: i64,ch = load 0x3875080, 0x3874910, 0x3874b30<LD8[%1]> [ORD=7]
[ID=11]
    0x3874910: i64 = FrameIndex<0> [ID=2]
    0x3874b30: i64 = undef [ID=3]
In function: func
clang-3.7: error: clang frontend command failed with exit code 70 (use -v to
see invocation)

Example code to reproduce error:

#define FS_RELATIVE __attribute__((address_space(257)))
void func(char * p1, char * p2) {
    FS_RELATIVE char * p11 = (FS_RELATIVE char *) p1; /* 01 */
    *p11 = *p2;
}

Possible workaround is to introduce a cast to a non-pointer-type, i.e. replace
line marked /* 01 */ with:
FS_RELATIVE char * p11 = (FS_RELATIVE char *)(unsigned long)p1;

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