[LLVMbugs] [Bug 5306] New: r84987 breaks some simple code

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=5306

           Summary: r84987 breaks some simple code
           Product: new-bugs
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: quickslyver at free.fr
                CC: llvmbugs at cs.uiuc.edu, vhernandez at apple.com


with the source C code: 
$ cat bug.c 

int buf[256];

void* malloc(unsigned int size)
{
  return buf;
}

void free(char* ptr)
{
}

int main()
{
  char *a=malloc(100);
  free(a);
}

----------------------------------------
the following build commands before r84987 outputs :

$clang-cc bug.c -emit-llvm-bc && llvm-ld bug.bc && llvm-dis a.out.bc -o -
; ModuleID = 'a.out.bc'
target datalayout =
"e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:32:32"
target triple = "i386-pc-linux-gnu"

define i32 @main() nounwind readnone {
entry:
  ret i32 0
}

---------------------------------------
and after r84987 there is an unreachable:

$clang-cc bug.c -emit-llvm-bc && llvm-ld bug.bc && llvm-dis a.out.bc -o -
; ModuleID = 'a.out.bc'
target datalayout =
"e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:32:32"
target triple = "i386-pc-linux-gnu"

define i32 @main() nounwind readnone {
entry:
  unreachable
}


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