codegen.c

#include "9cc.h"

// 再帰的にコード生成
void gen(Node *node){
	if (node->kind == ND_NUM){
		printf("  push %d\n", node->val);
		return;
	}

	gen(node->lhs);
	gen(node->rhs);

	printf("  pop rdi\n");
	printf("  pop rax\n");

	switch (node->kind){
		case ND_ADD:
			printf("  add rax, rdi\n");
			break;
		case ND_SUB:
			printf("  sub rax, rdi\n");
			break;
		case ND_MUL:
			printf("  imul rax, rdi\n");
			break;
		case ND_DIV:
			printf("  cqo\n");
			printf("  idiv rdi\n");
			break;

		case ND_EQ:
			printf("  cmp rax, rdi\n");
			printf("  sete al\n");
			printf("  movzb  rax, al\n");
			break;
		case ND_NEQ:
			printf("  cmp rax, rdi\n");
			printf("  setne al\n");
			printf("  movzb  rax, al\n");
			break;
		case ND_LT:
			printf("  cmp rax, rdi\n");
			printf("  setl al\n");
			printf("  movzb  rax, al\n");
			break;
		case ND_LE:
			printf("  cmp rax, rdi\n");
			printf("  setle al\n");
			printf("  movzb  rax, al\n");
			break;
	}

	printf("  push rax\n");
}