phi函数中的类型错误

对于下面的测试用例：

//单个if
int main(){
  int a;
  if(1) a=1;
  return a;
}

生成下面的LLVM IR

define i32 @main(  ) {
block0:
  %0 = icmp ne i32 1, 0
  br i1 %0, label %block1, label %block2
block1:
  br label %block2
block2:
  %1 = phi i32 [0.000000, %block0], [1, %block1]
  br label %block3
block3:
  %2 = phi i32 [%1, %block2]
  ret i32 %2
}

问题出现在block2的phi函数中：

llc: error: llc: test.ll:8:17: error: floating point constant invalid for type
  %1 = phi i32 [0.000000, %block0], [1, %block1]
                ^

应该是类型转换错误.