{"id":1241,"date":"2024-07-20T02:12:05","date_gmt":"2024-07-19T18:12:05","guid":{"rendered":"http:\/\/www.jusesgod.com\/?p=1241"},"modified":"2024-09-10T15:35:42","modified_gmt":"2024-09-10T07:35:42","slug":"%e7%ac%ac3%e7%ab%a0-%e7%a8%8b%e5%ba%8f%e7%9a%84%e6%9c%ba%e5%99%a8%e7%ba%a7%e8%a1%a8%e7%8e%b0","status":"publish","type":"post","link":"http:\/\/www.jusesgod.com\/?p=1241","title":{"rendered":"\u7b2c3\u7ae0 \u7a0b\u5e8f\u7684\u673a\u5668\u7ea7\u8868\u73b0"},"content":{"rendered":"\n

3.2 \u7a0b\u5e8f\u7f16\u7801<\/h2>\n\n\n\n

3.3 \u6570\u636e\u683c\u5f0f<\/h2>\n\n\n\n
C\u58f0\u660e<\/td>Intel\u6570\u636e\u7c7b\u578b<\/td>\u6c47\u7f16\u4ee3\u7801\u540e\u7f00<\/td>\u5927\u5c0f\uff08\u5b57\u8282\uff09<\/td><\/tr>
char<\/td>\u5b57\u8282<\/td>b<\/td>1<\/td><\/tr>
short<\/td>\u5b57<\/td>w<\/td>2<\/td><\/tr>
int<\/td>\u53cc\u5b57<\/td>l<\/td>4<\/td><\/tr>
long int<\/td>\u53cc\u5b57<\/td>l<\/td>4<\/td><\/tr>
long long int<\/td>–<\/td>–<\/td>4<\/td><\/tr>
char *<\/td>\u53cc\u5b57<\/td>l<\/td>4<\/td><\/tr>
float<\/td>\u5355\u7cbe\u5ea6<\/td>s<\/td>4<\/td><\/tr>
double<\/td>\u53cc\u7cbe\u5ea6<\/td>l<\/td>8<\/td><\/tr>
long double<\/td>\u6269\u5c55\u7cbe\u5ea6<\/td>t<\/td>10\/12<\/td><\/tr><\/tbody><\/table>
C\u8bed\u8a00\u6570\u636e\u7c7b\u578b\u5728IA32\u4e2d\u7684\u5927\u5c0f\u3002<\/figcaption><\/figure>\n\n\n\n

3.4 \u8bbf\u95ee\u4fe1\u606f<\/h2>\n\n\n\n
\"\"<\/figure>\n\n\n\n

3.4.1 \u64cd\u4f5c\u6570\u6307\u793a\u7b26<\/h3>\n\n\n\n
\u7c7b\u578b<\/td>\u683c\u5f0f<\/td>\u64cd\u4f5c\u6570\u503c<\/td>\u540d\u79f0<\/td><\/tr>
\u7acb\u5373\u6570<\/td>$Imm<\/em><\/td>Imm<\/em><\/td>\u7acb\u5373\u6570\u5bfb\u5740<\/td><\/tr>
\u5bc4\u5b58\u5668<\/td>Ea<\/em><\/sub><\/td>R[Ea<\/em><\/sub>]<\/td>\u5bc4\u5b58\u5668\u5bfb\u5740<\/td><\/tr>
\u5b58\u50a8\u5668<\/td>Imm<\/em><\/td>M[Imm<\/em>]<\/td>\u7edd\u5bf9\u5bfb\u5740<\/td><\/tr>
\u5b58\u50a8\u5668<\/td>(Ea<\/em><\/sub>)<\/td>M[R[Ea<\/em><\/sub>]]<\/td>\u95f4\u63a5\u5bfb\u5740<\/td><\/tr>
\u5b58\u50a8\u5668<\/td>Imm<\/em>(Eb<\/em><\/sub>)<\/td>M[Imm<\/em>+R[Eb<\/em><\/sub>]]<\/td>\uff08\u57fa\u5740+\u504f\u79fb\u91cf\uff09\u5bfb\u5740<\/td><\/tr>
\u5b58\u50a8\u5668<\/td>\uff08Eb<\/em><\/sub>,Ei<\/em><\/sub>\uff09<\/td>M[R[Eb<\/em><\/sub>]+R[Ei<\/em><\/sub>]]<\/td>\u53d8\u5740\u5bfb\u5740<\/td><\/tr>
\u5b58\u50a8\u5668<\/td>Imm<\/em>(Eb<\/sub><\/em>,Ei<\/sub><\/em>)<\/td>M[Imm+R[Eb<\/sub><\/em>]+R[Ei<\/em><\/sub>]]<\/td>\u53d8\u5740\u5bfb\u5740<\/td><\/tr>
\u5b58\u50a8\u5668<\/td>(,Ei<\/sub><\/em>,s<\/em>)<\/td>M[R[Ei<\/sub><\/em>]\u00b7s<\/em>]<\/td>\u6bd4\u4f8b\u53d8\u5740\u5bfb\u5740<\/td><\/tr>
\u5b58\u50a8\u5668<\/td>Imm<\/em>(,Ei<\/sub><\/em>,s<\/em>)<\/td>M[Imm<\/em>+R[Ei<\/sub><\/em>]\u00b7s<\/em>]<\/td>\u6bd4\u4f8b\u53d8\u5740\u5bfb\u5740<\/td><\/tr>
\u5b58\u50a8\u5668<\/td>(Eb<\/em><\/sub>,Ei<\/sub><\/em>,s<\/em>)<\/td>M[R[Eb<\/em><\/sub>]+R[Ei<\/sub><\/em>]\u00b7s<\/em>]<\/td>\u6bd4\u4f8b\u53d8\u5740\u5bfb\u5740<\/td><\/tr>
\u5bc4\u5b58\u5668<\/td>Imm<\/em>(Eb<\/sub><\/em>,Ei<\/sub><\/em>,s<\/em>)<\/td>M[Imm<\/em>+R[Eb<\/em><\/sub>]+R[Ei<\/sub><\/em>]\u00b7s<\/em>]<\/td>\u6bd4\u4f8b\u53d8\u5740\u5bfb\u5740<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

3.4.2 \u6570\u636e\u4f20\u9001\u6307\u4ee4<\/h3>\n\n\n\n
\n
\u6307\u4ee4<\/td>\u6548\u679c<\/td>\u63cf\u8ff0<\/td><\/tr>
MOV S, D<\/td>D \u2190 S<\/td>\u4f20\u9001<\/td><\/tr>
movb
movw
movl<\/td>		\u4f20\u9001\u5b57\u8282
\u4f20\u9001\u5b57
\u4f20\u9001\u53cc\u5b57<\/td>		<\/td><\/tr>
MOVS S, D<\/td>D \u2190 \u7b26\u53f7\u6269\u5c55\uff08S\uff09<\/td>\u4f20\u9001\u7b26\u53f7\u6269\u5c55\u7684\u5b57\u8282<\/td><\/tr>
movsbw
movsbl
movswl<\/td>		\u5c06\u505a\u4e86\u7b26\u53f7\u6269\u5c55\u7684\u5b57\u8282\u4f20\u9001\u5230\u5b57
\u5c06\u505a\u4e86\u7b26\u53f7\u6269\u5c55\u7684\u5b57\u8282\u4f20\u9001\u5230\u53cc\u5b57
\u5c06\u505a\u4e86\u7b26\u53f7\u6269\u5c55\u7684\u5b57\u4f20\u9001\u5230\u53cc\u5b57<\/td>		<\/td><\/tr>
MOVZ S, D<\/td>D \u2190 \u96f6\u6269\u5c55\uff08S\uff09<\/td>\u4f20\u9001\u96f6\u6269\u5c55\u7684\u5b57\u8282<\/td><\/tr>
movzbw
movzbl
movzwl

pushl S

popl D<\/td>		\u5c06\u505a\u4e86\u96f6\u6269\u5c55\u7684\u5b57\u4f20\u9001\u5230\u5b57
\u5c06\u505a\u4e86\u96f6\u6269\u5c55\u7684\u5b57\u8282\u4f20\u9001\u5230\u53cc\u5b57
\u5c06\u505a\u4e86\u96f6\u6269\u5c55\u7684\u5b57\u4f20\u9001\u5230\u53cc\u5b57
R[%esp] \u2190 R[@esp]-4;
M[R[%esp]] \u2190 S
D \u2190 M[R[%esp]];
R[%esp] \u2190 R[@esp]+4<\/td>



\u5c06\u53cc\u5b57\u538b\u6808

\u5c06\u53cc\u5b57\u51fa\u6808<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div><\/div>\n\n\n\n

3.5 \u7b97\u672f\u548c\u903b\u8f91\u64cd\u4f5c<\/h2>\n\n\n\n

\u52a0\u8f7d\u6709\u6548\u5730\u5740\uff08load effective address\uff09\u901a\u5e38\u7528\u6765\u6267\u884c\u7b80\u5355\u7684\u7b97\u672f\u64cd\u4f5c\u3002\u6bd4\u5982\uff1a
leal 6(%eax), %eax \u5c31\u76f8\u5f53\u4e8e x+=6;<\/p>\n\n\n\n

\u6307\u4ee4<\/td>\u6548\u679c<\/td>\u63cf\u8ff0<\/td><\/tr>
lead S, D<\/td>D \u2190 &S<\/td>\u52a0\u8f7d\u6709\u6548\u5730\u5740<\/td><\/tr>
INC D
DEC D
NEG D
NOT D<\/td>		D \u2190 D + 1
D \u2190 D – 1
D \u2190 – D
D \u2190 ~ D<\/td>		\u52a01
\u51cf1
\u53d6\u8d1f
\u53d6\u8865<\/td><\/tr>
ADD S, D
SUB S, D
IMUL S, D
XOR S, D
OR S, D
AND S, D<\/td>		D \u2190 D + S
D \u2190 D – S
D \u2190 D * S
D \u2190 D ^ S
D \u2190 D | S
D \u2190 D & S<\/td>		\u52a0
\u51cf
\u4e58
\u5f02\u6216
\u6216
\u4e0e<\/td><\/tr>
SAL k, D
SHL k, D
SAR k, D
SHR k, D<\/td>		D \u2190 D << k
D \u2190 D << k
D \u2190 D >>A<\/sub> k
D \u2190 D >>L<\/sub> k<\/td>		\u5de6\u79fb
\u5de6\u79fb\uff08\u7b49\u540c\u4e8eSAL\uff09
\u7b97\u672f\u53f3\u79fb
\u903b\u8f91\u53f3\u79fb<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

3.5.2 \u4e00\u5143\u64cd\u4f5c\u548c\u4e8c\u5143\u64cd\u4f5c<\/h3>\n\n\n\n

\u4e00\u5143\u64cd\u4f5c\uff1a\u53ea\u6709\u4e00\u4e2a\u64cd\u4f5c\u6570\uff0c\u65e2\u662f\u6e90\u53c8\u662f\u76ee\u7684\u3002
\u4e8c\u5143\u64cd\u4f5c\uff1a\u7b2c\u4e8c\u4e2a\u64cd\u4f5c\u6570\u65e2\u662f\u6e90\u53c8\u662f\u76ee\u7684\u3002movl\u548c\u7b97\u672f\u3001\u903b\u8f91\u6307\u4ee4\u4e00\u6837\uff0c\u4e24\u4e2a\u64cd\u4f5c\u6570\u4e0d\u80fd\u540c\u65f6\u662f\u5b58\u50a8\u5668\u4f4d\u7f6e<\/p>\n\n\n\n

3.5.5 \u7279\u6b8a\u7684\u7b97\u672f\u64cd\u4f5c<\/h3>\n\n\n\n
\u6307\u4ee4<\/td>\u6548\u679c<\/td>\u63cf\u8ff0<\/td><\/tr>
imull S
mull S<\/td>		R[%edx]:R[%eax] \u2190 S \u00d7 R[%eax]
R[%edx]:R[%eax] \u2190 S \u00d7 R[%eax]<\/td>		\u6709\u7b26\u53f7\u516864\u4f4d\u4e58\u6cd5
\u65e0\u7b26\u53f7\u516864\u4f4d\u4e58\u6cd5<\/td><\/tr>
cltd<\/td>R[%edx]:R[%eax] \u2190 SignExtend(R[%eax])<\/td>\u8f6c\u4e3a\u56db\u5b57<\/td><\/tr>
idivl S<\/td>R[%edx] \u2190 R[%edx]:R[%eax] mod S
R[%eax] \u2190 R[%edx]:R[%eax] \u00f7 S<\/td>		\u6709\u7b26\u53f7\u9664\u6cd5<\/td><\/tr>
divl S<\/td>R[%edx] \u2190 R[%edx]:R[%eax] mod S
R[%eax] \u2190 R[%edx]:R[%eax] \u00f7 S<\/td>		\u65e0\u7b26\u53f7\u9664\u6cd5<\/td><\/tr><\/tbody><\/table>
imull\u4e58\u79ef\u5b58\u5728%edx\uff08\u9ad832\u4f4d\uff09\u548c%eax\uff08\u4f4e32\u4f4d\uff09\u3002<\/figcaption><\/figure>\n\n\n\n

3.6 \u63a7\u5236<\/h2>\n\n\n\n

<\/p>\n","protected":false},"excerpt":{"rendered":"

3.2 \u7a0b\u5e8f\u7f16\u7801 3.3 \u6570\u636e\u683c\u5f0f C\u58f0\u660e Inte...<\/p>\n","protected":false},"author":1,"featured_media":1533,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[31,30],"tags":[],"class_list":["post-1241","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-a-programmers-perspective","category-computer-scince"],"_links":{"self":[{"href":"http:\/\/www.jusesgod.com\/index.php?rest_route=\/wp\/v2\/posts\/1241","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.jusesgod.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.jusesgod.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.jusesgod.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.jusesgod.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1241"}],"version-history":[{"count":4,"href":"http:\/\/www.jusesgod.com\/index.php?rest_route=\/wp\/v2\/posts\/1241\/revisions"}],"predecessor-version":[{"id":1246,"href":"http:\/\/www.jusesgod.com\/index.php?rest_route=\/wp\/v2\/posts\/1241\/revisions\/1246"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/www.jusesgod.com\/index.php?rest_route=\/wp\/v2\/media\/1533"}],"wp:attachment":[{"href":"http:\/\/www.jusesgod.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1241"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.jusesgod.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1241"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.jusesgod.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1241"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}