Please include a testcase, preferably in C form. Thanks!

I couldn't get llvm-gcc to let me specify alignment on a function, but the same happens for other global data:

#include <stdlib.h>

int cons attribute ((aligned(8)));

unsigned long foo() {
return ((size_t) &cons) & 7;
}

output:

$ llvm-gcc -c llvm-func-and.c -emit-llvm -o out.bc -O3 && llvm-dis -o - out.bc
; ModuleID = 'out.bc'
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"
target triple = "x86_64-unknown-linux-gnu"
@​cons = weak global i32 0, align 8 ; <i32*> [#uses=1]

define i64 @​foo() nounwind {
entry:
ret i64 and (i64 ptrtoint (i32* @​cons to i64), i64 7)
}

With this:
http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20080407/060935.html
the bitwise-instruction optimizer now knows some things about alignment of globals.

However, the given testcase isn't yet simplified because it uses a constant expression
instead of instructions, so it would need to be simplified by the constant folder.

implemented:
http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20080414/061282.html

mentioned in issue llvm/llvm-bugzilla-archive#2240