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source_filename = "while_test.sy"
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-pc-linux-gnu"
@b = d s o _ l o c a l global i32 0 , align 4
@a = d s o _ l o c a l global i32 0 , align 4
define d s o _ l o c a l i32 @main ( ) {
store i32 0 , i32 * @b , align 4
store i32 3 , i32 * @a , align 4 ; b, a分别赋给0, 3
br label %1 ; 跳转到标签2处
1 :
%2 = load i32 , i32 * @a , align 4
%3 = icmp sgt i32 %2 , 0
br i1 %3 , label %4 , label %10 ; 判断a是否大于0，
4 :
%5 = load i32 , i32 * @b , align 4
%6 = load i32 , i32 * @a , align 4
%7 = add i32 %5 , %6
store i32 %7 , i32 * @b , align 4
%8 = load i32 , i32 * @a , align 4
%9 = sub i32 %8 , 1
store i32 %9 , i32 * @a , align 4 ; 进入循环，
br label %1 ; 跳转循环开头
10 :
%11 = load i32 , i32 * @b , align 4
ret i32 %11 ; 加载%b并返回
}
