optimized!

helloworld.ll

; ModuleID = '-'
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
target triple = "x86_64-apple-macosx10.7.3"

define i32 @main(i32 %argc, i8** nocapture %argv) nounwind uwtable ssp {
  %1 = call i32 @putchar(i32 72) nounwind
  %2 = call i32 @putchar(i32 101) nounwind
  %3 = call i32 @putchar(i32 108) nounwind
  %4 = call i32 @putchar(i32 108) nounwind
  %5 = call i32 @putchar(i32 111) nounwind
  %6 = call i32 @putchar(i32 32) nounwind
  %7 = call i32 @putchar(i32 87) nounwind
  %8 = call i32 @putchar(i32 111) nounwind
  %9 = call i32 @putchar(i32 114) nounwind
  %10 = call i32 @putchar(i32 108) nounwind
  %11 = call i32 @putchar(i32 100) nounwind
  %12 = call i32 @putchar(i32 33) nounwind
  ret i32 0
}

declare i32 @putchar(i32) nounwind