[LLVMbugs] [Bug 5060] New: clang ignores attribute aligned on some variables

bugzilla-daemon at cs.uiuc.edu bugzilla-daemon at cs.uiuc.edu
Sat Sep 26 09:47:44 PDT 2009


           Summary: clang ignores attribute aligned on some variables
           Product: clang
           Version: trunk
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: LLVM Codegen
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: gohman at apple.com
                CC: llvmbugs at cs.uiuc.edu

For this C source:

char *foo(void) {
  static char p __attribute__((aligned(32)));
  return &p;

void frob(char *);
void bar(long n) {
  char p[n] __attribute__((aligned(32)));

clang emits LLVM IR containing these two constructs, missing the alignment

@foo.p = internal global i8 0                     ; <i8*> [#uses=1]

  %vla = alloca i8, i32 %n3, align 1              ; <i8*> [#uses=1]

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