\u4e4b\u524d\u56e7\u54e5\u66fe\u7ecf\u5199\u8fc7\u4e00\u4e2a\u65e5\u5fd7\uff0c\u8ba8\u8bba\u4e00\u4e2a\u95ee\u9898\uff0c\u5c31\u662f\u5728c\/c++\u91cc\u9762\u8fd9\u4e2a\u4ee3\u7801\u7684\u7ed3\u679c<\/p>\n
\nx = 1;\nx = x++;\n<\/pre>\n\u6267\u884c\u540e\uff0cx\u662f2\u3002\u8fd9\u4e2a\u7ed3\u8bba\u8fd8\u662f\u6bd4\u8f83\u663e\u800c\u6613\u89c1\u7684\uff0c\u4e0d\u8fc7\u7f16\u8bd1\u5668\u5230\u5e95\u662f\u600e\u4e48\u5904\u7406\u8fd9\u6bb5\u4ee3\u7801\u7684\u5462\uff1f
\n\u6211\u7528 Fedora 15 \u81ea\u5e26\u7684 gcc -S -O0 \u5c06 .c \u7f16\u8bd1\u6210 .s \u6587\u4ef6\uff0c\u6765\u770b\u770b\u7a76\u7adf\u7f16\u8bd1\u5668\u5e72\u4e86\u4ec0\u4e48\u3002<\/p>\n\nint x = 13; \/\/ \u4e3a\u4e86\u770b\u6c47\u7f16\u66f4\u65b9\u4fbf\uff0c\u8d4b\u503c13\nx = x++;\n<\/pre>\n\u88ab\u7ffb\u8bd1\u6210\u5982\u4e0b\u7684\u6c47\u7f16\u4ee3\u7801\uff1a<\/p>\n
\nmovl\t$13, -4(%rbp) ;x=13\naddl\t$1, -4(%rbp) ;x++\nmovl\t$0, %eax\npopq\t%rbp\n<\/pre>\n\u4ece\u6c47\u7f16\u7801\u6765\u770b\uff0cgcc \u662f\u8fd9\u6837\u7406\u89e3x = x++\u7684\uff1a<\/p>\n
\nx = x; \/\/ \u88ab\u4f18\u5316\u6389\u4e86\nx++;\n<\/pre>\n\u4e5f\u5c31\u662f\u5bf9\u4e8e int \u8fd9\u79cd trivial \u7c7b\u578b\uff0c= \u7684\u4f18\u5148\u7ea7\u9ad8\u4e8e\u540e\u7f6e++\u3002<\/span> \u5148\u8d4b\u503c\uff0c\u518d\u505a\u540e\u7f6e++\u3002
\n\u6211\u4eec\u518d\u6765\u8bd5\u51e0\u4e2a\u4ee3\u7801\uff1a
\n\u7b2c\u4e00\u7ec4<\/p>\n\nint x=13;\nint y;\ny = x++;\n<\/pre>\n\u7ffb\u8bd1\u7ed3\u679c\uff1a<\/p>\n
\nmovl\t$13, -4(%rbp) ;x=13\nmovl\t-4(%rbp), %eax ;eax=x\nmovl\t%eax, -8(%rbp) ;y=eax\naddl\t$1, -4(%rbp) ;x++\nmovl\t$0, %eax\npopq\t%rbp\n<\/pre>\n————————————————–
\n\u7b2c\u4e8c\u7ec4<\/p>\n\nint x=13;\nint y;\nx = y = x++;\n<\/pre>\n\u7ffb\u8bd1\u7ed3\u679c\uff1a<\/p>\n
\nmovl\t$13, -4(%rbp) ;x=13\nmovl\t-4(%rbp), %eax ;eax=x\nmovl\t%eax, -8(%rbp) ;y=eax\nmovl\t-8(%rbp), %eax ;eax=y\nmovl\t%eax, -4(%rbp) ;x=y\naddl\t$1, -4(%rbp) ;x++\nmovl\t$0, %eax\npopq\t%rbp\n<\/pre>\n————————————————–
\n\u7b2c\u4e09\u7ec4<\/p>\n\nint x=13;\nint y;\ny = ++x;\n<\/pre>\n\u7ffb\u8bd1\u7ed3\u679c\uff1a<\/p>\n
\nmovl\t$13, -4(%rbp) ;x=13\naddl\t$1, -4(%rbp) ;++x\nmovl\t-4(%rbp), %eax ;eax=x\nmovl\t%eax, -8(%rbp) ;y=eax\nmovl\t$0, %eax\npopq\t%rbp\n<\/pre>\n————————————————–
\n\u4ece\u5404\u4e2a\u4f8b\u5b50\u4e2d\u53ef\u4ee5\u770b\u51fa\uff0cgcc \u5bf9\u4e8e int \u8fd9\u79cd trivial \u7c7b\u578b\uff0c\u8ba4\u4e3a = \u4f18\u5148\u7ea7\u9ad8\u4e8e\u540e\u7f6e++\uff0c\u4f4e\u4e8e\u524d\u7f6e++\u3002<\/span><\/p>\n\u8d4b\u503c\u5148\u4e8e\u540e\u7f6e++\uff0c\u540e\u4e8e\u524d\u7f6e++\u3002<\/p>\n
\u5373\u4f7f\u590d\u6742\u70b9\u7684\u4f8b\u5b50x=((x++)+(y++))\uff0c\u76f8\u5f53\u4e8e\uff1a<\/p>\n
x=x+y;<\/p>\n
x++;<\/p>\n
y++;<\/p>\n","protected":false},"excerpt":{"rendered":"
\u4e4b\u524d\u56e7\u54e5\u66fe\u7ecf\u5199\u8fc7\u4e00\u4e2a\u65e5\u5fd7\uff0c\u8ba8\u8bba\u4e00\u4e2a\u95ee\u9898\uff0c\u5c31\u662f\u5728c\/c++\u91cc\u9762\u8fd9\u4e2a\u4ee3\u7801\u7684\u7ed3\u679c x = 1; x = x++; \u6267 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[13],"tags":[92,310,311,317],"class_list":["post-659525","post","type-post","status-publish","format-standard","hentry","category-13","tag-gcc","tag-310","tag-311","tag-317"],"_links":{"self":[{"href":"https:\/\/www.sunjw.us\/blog\/wp-json\/wp\/v2\/posts\/659525","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.sunjw.us\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.sunjw.us\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.sunjw.us\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.sunjw.us\/blog\/wp-json\/wp\/v2\/comments?post=659525"}],"version-history":[{"count":0,"href":"https:\/\/www.sunjw.us\/blog\/wp-json\/wp\/v2\/posts\/659525\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.sunjw.us\/blog\/wp-json\/wp\/v2\/media?parent=659525"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.sunjw.us\/blog\/wp-json\/wp\/v2\/categories?post=659525"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.sunjw.us\/blog\/wp-json\/wp\/v2\/tags?post=659525"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}