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c - C中#if 1的意义是什么

转载 作者:太空宇宙 更新时间:2023-11-04 02:02:53 25 4
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我发现一些程序带有#if 类型的语句。这个#if 1有什么意义?这是代码片段:

   for (;;) {
register const uint8_t* m_pos;
unsigned m_off;
unsigned m_len;
unsigned dindex;

D_INDEX1(dindex,ip);
GINDEX(m_pos,m_off,dict,dindex,in);
if (LZO_CHECK_MPOS_NON_DET(m_pos,m_off,in,ip,M4_MAX_OFFSET))
goto literal;
#if 1
if (m_off <= M2_MAX_OFFSET || m_pos[3] == ip[3])
goto try_match;
D_INDEX2(dindex,ip);
#endif
GINDEX(m_pos,m_off,dict,dindex,in);
if (LZO_CHECK_MPOS_NON_DET(m_pos,m_off,in,ip,M4_MAX_OFFSET))
goto literal;
if (m_off <= M2_MAX_OFFSET || m_pos[3] == ip[3])
goto try_match;
goto literal;

try_match:

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