[LLVMbugs] [Bug 3666] New: X86 backend converts calls to constant addresses to indirect calls.

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=3666

           Summary: X86 backend converts calls to constant addresses to
                    indirect calls.
           Product: libraries
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Backend: X86
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: marks at dcs.gla.ac.uk
                CC: llvmbugs at cs.uiuc.edu


The following llvm code:

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 {
entry:
        %0 = call i32 inttoptr (i32 12345678 to i32 (i32)*)(i32 0) nounwind    
        ; <i32> [#uses=1]
        ret i32 %0
}

Produces the following assembler (with directives removed)

main:
        subl    $4, %esp
        movl    $0, (%esp)
        movl    $12345678, %eax
        call    *%eax
        addl    $4, %esp
        ret

Whereas it should produce this code:

main:
        subl    $4, %esp
        movl    $0, (%esp)
        call    *12345678
        addl    $4, %esp
        ret

This is important since all calls in JIT compiled code, will be in the above
form.


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