c-code:

int main()
{
	int i=0,j=0;
	for(i=10;i>0;i--)
	{
		j=10;
		printf("%d\n",i);
	}
	printf("%d\n",j);
}

llvm-bytecode after mem2reg pass.


; ModuleID = '<stdin>'
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-n8:16:32"
target triple = "i386-pc-linux-gnu"

@.str = private constant [4 x i8] c"%d\0A\00", align 1

define i32 @main() nounwind {
entry:
  %"alloca point" = bitcast i32 0 to i32
  br label %bb1

bb:                                               ; preds = %bb1
  %0 = call i32 (i8*, ...)* @printf(i8* noalias getelementptr inbounds ([4 x i8]* @.str, i32 0, i32 0), i32 %i.0) nounwind
  %1 = sub nsw i32 %i.0, 1
  br label %bb1

bb1:                                              ; preds = %bb, %entry
  %i.0 = phi i32 [ 10, %entry ], [ %1, %bb ]
%j.0 = phi i32 [ 0, %entry ], [ 10, %bb ]
  %2 = icmp sgt i32 %i.0, 0
  br i1 %2, label %bb, label %bb2

bb2:                                              ; preds = %bb1
  %3 = call i32 (i8*, ...)* @printf(i8* noalias getelementptr inbounds ([4 x i8]* @.str, i32 0, i32 0), i32 %j.0) nounwind
  br label %return

return:                                           ; preds = %bb2
  ret i32 undef
}

declare i32 @printf(i8* noalias, ...) nounwind