llvm中間言語によるフィボナッチ数の計算です

fib.ll

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

define i32 @main() {
        %ds = alloca [4 x i8]
        store [4 x i8] c"%d\0a\00", [4 x i8]* %ds
        %dp = getelementptr [4 x i8], [4 x i8]* %ds, i64 0, i64 0
        %x1 = alloca i32
        store i32 1, i32* %x1
        %x2 = alloca i32
        store i32 1, i32* %x2
        call i32 (i8*, ...) @printf(i8* %dp, i32 1)
        call i32 (i8*, ...) @printf(i8* %dp, i32 1)
        br label %loop
loop:
        %y1 = load i32, i32* %x1
        %y2 = load i32, i32* %x2
        %y3 = add i32 %y1, %y2
        call i32 (i8*, ...) @printf(i8* %dp, i32 %y3)
        store i32 %y2, i32* %x1
        store i32 %y3, i32* %x2
        %cond = icmp sgt i32 10000, %y1
        br i1 %cond, label %loop, label %exit
exit:
        ret i32 0
}