[LLVMbugs] [Bug 21529] New: Inefficient encoding when using direct object emission

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=21529

            Bug ID: 21529
           Summary: Inefficient encoding when using direct object emission
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: MC
          Assignee: rafael.espindola at gmail.com
          Reporter: rafael.espindola at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

given 

define void @f() {
  %foo = alloca i8, align 32
  ret void
}

we produce

48 81 e4 e0 ff ff ff                             andq    $-32, %rsp

when using direct object emission from llc

and

48 83 e4 e0                                      andq    $-32, %rsp

if printing assembly and reading it back in with llvm-mc

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