{"id":48656,"date":"2025-07-30T12:57:27","date_gmt":"2025-07-30T04:57:27","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/48656.html"},"modified":"2025-07-30T12:57:27","modified_gmt":"2025-07-30T04:57:27","slug":"%e6%89%8b%e6%8a%8a%e6%89%8b%e6%95%99%e4%bd%a0%e7%8e%a9%e8%bd%ac%e6%9c%8d%e5%8a%a1%e5%99%a8%e8%8a%af%e7%89%87%e6%9e%b6%e6%9e%84-6-2-llvm%e4%b8%8erisc-v%e5%90%8e%e7%ab%af%ef%bc%9a","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/48656.html","title":{"rendered":"\u624b\u628a\u624b\u6559\u4f60\u73a9\u8f6c\u670d\u52a1\u5668\u82af\u7247\u67b6\u6784--\u200b\u200b6.2 LLVM\u4e0eRISC-V\u540e\u7aef\uff1a\u5982\u4f55\u7528Clang\u7f16\u8bd1RISC-V\u4ee3\u7801\uff1f\u200b"},"content":{"rendered":"<h4>\u200b<\/h4>\n<p>\u76ee\u5f55<\/p>\n<p style=\"margin-left:80px\">\u200b\u200b<\/p>\n<p style=\"margin-left:80px\">\u7b2c\u516d\u7ae0 \u5de5\u5177\u94fe\u4e0e\u751f\u6001&#xff1a;\u4ece\u7f16\u8bd1\u5230\u90e8\u7f72\u200b\u200b<\/p>\n<p style=\"margin-left:120px\">\u200b\u200b6.2 LLVM\u4e0eRISC-V\u540e\u7aef&#xff1a;\u5982\u4f55\u7528Clang\u7f16\u8bd1RISC-V\u4ee3\u7801&#xff1f;\u200b\u200b<\/p>\n<p style=\"margin-left:160px\">\u200b\u200b1. \u73af\u5883\u914d\u7f6e\u4e0e\u5de5\u5177\u94fe\u642d\u5efa\u200b\u200b<\/p>\n<p style=\"margin-left:160px\">\u200b\u200b2. \u7f16\u8bd1RISC-V\u4ee3\u7801\u7684Clang\u547d\u4ee4\u200b\u200b<\/p>\n<p style=\"margin-left:160px\">\u200b\u200b3. \u94fe\u63a5\u4e0e\u5185\u5b58\u5e03\u5c40\u4f18\u5316\u200b\u200b<\/p>\n<p style=\"margin-left:160px\">\u200b\u200b4. \u8c03\u8bd5\u4e0e\u6027\u80fd\u5206\u6790\u200b\u200b<\/p>\n<p style=\"margin-left:160px\">\u200b\u200b5. \u5b9e\u9645\u6848\u4f8b&#xff1a;\u5411\u91cf\u52a0\u6cd5\u4f18\u5316\u200b\u200b<\/p>\n<p style=\"margin-left:160px\">\u200b\u200b6. \u5e38\u89c1\u95ee\u9898\u4e0e\u89e3\u51b3\u200b\u200b<\/p>\n<p style=\"margin-left:160px\">\u200b\u200b7. \u603b\u7ed3\u200b\u200b<\/p>\n<hr \/>\n<p>\u00a0<\/p>\n<h4>\u200b<\/h4>\n<h4>\u7b2c\u516d\u7ae0 \u5de5\u5177\u94fe\u4e0e\u751f\u6001&#xff1a;\u4ece\u7f16\u8bd1\u5230\u90e8\u7f72\u200b\u200b<\/h4>\n<p>\u200b\u200b6.2 LLVM\u4e0eRISC-V\u540e\u7aef&#xff1a;\u5982\u4f55\u7528Clang\u7f16\u8bd1RISC-V\u4ee3\u7801&#xff1f;\u200b\u200b<\/p>\n<hr \/>\n<p>\u200b\u200b1. \u73af\u5883\u914d\u7f6e\u4e0e\u5de5\u5177\u94fe\u642d\u5efa\u200b\u200b<\/p>\n<p>\u200b\u200b(1) \u5b89\u88c5RISC-V\u652f\u6301\u7684LLVM\u5de5\u5177\u94fe\u200b\u200b<\/p>\n<ul>\n<li>\u200b\u200b\u6e90\u7801\u7f16\u8bd1LLVM\u200b\u200b&#xff1a; git clone https:\/\/github.com\/llvm\/llvm-project.git<br \/>\ncd llvm-project<br \/>\ngit checkout llvmorg-15.0.0  # \u9009\u62e9\u652f\u6301RISC-V Vector\u7684\u7248\u672c<br \/>\nmkdir build &amp;&amp; cd build<br \/>\ncmake -DLLVM_ENABLE_PROJECTS&#061;&#034;clang;lld&#034; \\\\<br \/>\n      -DLLVM_TARGETS_TO_BUILD&#061;&#034;RISCV&#034; \\\\<br \/>\n      -DCMAKE_BUILD_TYPE&#061;Release \\\\<br \/>\n      ..<br \/>\nninja &amp;&amp; sudo ninja install   <\/p>\n<ul>\n<li>\u200b\u200b\u5173\u952e\u53c2\u6570\u200b\u200b&#xff1a;\n<ul>\n<li>-DLLVM_TARGETS_TO_BUILD&#061;&#034;RISCV&#034;&#xff1a;\u4ec5\u7f16\u8bd1RISC-V\u540e\u7aef\u3002<\/li>\n<li>-DLLVM_ENABLE_PROJECTS&#061;&#034;clang;lld&#034;&#xff1a;\u542f\u7528Clang\u548cLLD\u94fe\u63a5\u5668\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>\u200b\u200b(2) \u914d\u7f6e\u4ea4\u53c9\u7f16\u8bd1\u73af\u5883\u200b\u200b<\/p>\n<ul>\n<li>\u200b\u200b\u8bbe\u7f6e\u73af\u5883\u53d8\u91cf\u200b\u200b&#xff1a; export PATH&#061;\/usr\/local\/bin:$PATH<br \/>\nexport RISCV_PREFIX&#061;riscv64-unknown-elf-<br \/>\nexport RISCV_TARGET&#061;riscv64gc<br \/>\nexport RISCV_ABI&#061;lp64d   <\/li>\n<li>\u200b\u200b\u9a8c\u8bc1\u5de5\u5177\u94fe\u200b\u200b&#xff1a; $RISCV_PREFIX-gcc &#8211;version  # \u786e\u8ba4\u5de5\u5177\u94fe\u53ef\u7528\u6027   <\/li>\n<\/ul>\n<hr \/>\n<p>\u200b\u200b2. \u7f16\u8bd1RISC-V\u4ee3\u7801\u7684Clang\u547d\u4ee4\u200b\u200b<\/p>\n<p>\u200b\u200b(1) \u57fa\u7840\u7f16\u8bd1\u547d\u4ee4\u200b\u200b<\/p>\n<p>clang -target riscv64gc -march&#061;rv64gc -mabi&#061;lp64d \\\\<br \/>\n      -O3 -mllvm -riscv-v-vector-bits-min&#061;128 \\\\<br \/>\n      -o output.elf main.c   <\/p>\n<ul>\n<li>\u200b\u200b\u5173\u952e\u9009\u9879\u200b\u200b&#xff1a;\n<ul>\n<li>-march&#061;rv64gc&#xff1a;\u542f\u7528\u6574\u6570&#043;\u539f\u5b50&#043;\u538b\u7f29\u6307\u4ee4\u96c6\u3002<\/li>\n<li>-mllvm -riscv-v-vector-bits-min&#061;128&#xff1a;\u5f3a\u5236\u542f\u7528RISC-V Vector\u6269\u5c55&#xff08;\u6700\u4f4e128\u4f4dVLEN&#xff09;\u3002<\/li>\n<li>-O3&#xff1a;\u5f00\u542f\u5168\u4f18\u5316&#xff0c;\u5305\u542b\u81ea\u52a8\u5411\u91cf\u5316\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>\u200b\u200b(2) \u5411\u91cf\u5316\u4f18\u5316\u200b\u200b<\/p>\n<ul>\n<li>\u200b\u200b\u542f\u7528\u5faa\u73af\u5411\u91cf\u5316\u200b\u200b&#xff1a; -Rpass&#061;loop-vectorize -Rpass-analysis&#061;loop-vectorize\n<ul>\n<li>\u901a\u8fc7-Rpass\u53c2\u6570\u8f93\u51fa\u5411\u91cf\u5316\u5206\u6790\u62a5\u544a&#xff0c;\u5b9a\u4f4d\u672a\u5411\u91cf\u5316\u7684\u5faa\u73af\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u200b\u200b\u63a7\u5236\u5411\u91cf\u5bbd\u5ea6\u200b\u200b&#xff1a; -mllvm -force-vector-width&#061;4  # \u5f3a\u52364\u8def\u5411\u91cf\u5e76\u884c   <\/li>\n<\/ul>\n<hr \/>\n<p>\u200b\u200b3. \u94fe\u63a5\u4e0e\u5185\u5b58\u5e03\u5c40\u4f18\u5316\u200b\u200b<\/p>\n<p>\u200b\u200b(1) \u94fe\u63a5\u811a\u672c\u914d\u7f6e\u200b\u200b<\/p>\n<ul>\n<li>\u200b\u200b\u5b9a\u4e49\u5185\u5b58\u533a\u57df\u200b\u200b&#xff1a; MEMORY<br \/>\n{<br \/>\n    flash (rx)  : ORIGIN &#061; 0x00000000, LENGTH &#061; 16K<br \/>\n    ram (rwx)   : ORIGIN &#061; 0x20000000, LENGTH &#061; 64K<br \/>\n}  <\/p>\n<p>SECTIONS<br \/>\n{<br \/>\n    .text : { *(.text) } &gt; flash AT&gt; flash<br \/>\n    .data : { *(.data) } &gt; ram AT&gt; flash<br \/>\n    .bss  : { *(.bss)  } &gt; ram<br \/>\n}   <\/li>\n<li>\u200b\u200b\u52a8\u6001\u52a0\u8f7d\u652f\u6301\u200b\u200b&#xff1a; .stack (NOLOAD) : { _stack_start &#061; .; . &#043;&#061; 2K; } &gt; ram   <\/li>\n<\/ul>\n<p>\u200b\u200b(2) \u7b26\u53f7\u5bfc\u51fa\u4e0e\u91cd\u5b9a\u4f4d\u200b\u200b<\/p>\n<ul>\n<li>\u200b\u200b\u5bfc\u51fa\u5168\u5c40\u7b26\u53f7\u200b\u200b&#xff1a; __attribute__((used)) void _start() { &#8230; }   <\/li>\n<li>\u200b\u200b\u5904\u7406\u5916\u90e8\u4f9d\u8d56\u200b\u200b&#xff1a; -Wl,&#8211;gc-sections  # \u79fb\u9664\u672a\u5f15\u7528\u6bb5<br \/>\n-Wl,&#8211;print-memory-usage  # \u6253\u5370\u5185\u5b58\u5360\u7528\u5206\u6790   <\/li>\n<\/ul>\n<hr \/>\n<p>\u200b\u200b4. \u8c03\u8bd5\u4e0e\u6027\u80fd\u5206\u6790\u200b\u200b<\/p>\n<p>\u200b\u200b(1) \u4f7f\u7528GDB\u8c03\u8bd5\u200b\u200b<\/p>\n<p>riscv64-unknown-elf-gdb output.elf<br \/>\n(gdb) target remote localhost:1234  # \u8fde\u63a5QEMU<br \/>\n(gdb) break main<br \/>\n(gdb) stepi  # \u5355\u6b65\u6267\u884c\u6c47\u7f16\u6307\u4ee4<br \/>\n(gdb) info registers  # \u67e5\u770b\u5bc4\u5b58\u5668\u72b6\u6001   <\/p>\n<p>\u200b\u200b(2) \u6027\u80fd\u5206\u6790\u5de5\u5177\u200b\u200b<\/p>\n<ul>\n<li>\u200b\u200bLLVM-MCA\u200b\u200b&#xff1a;\u5206\u6790\u6307\u4ee4\u8c03\u5ea6\u4e0e\u6d41\u6c34\u7ebf\u6548\u7387&#xff1a; llvm-mca output.s &#8211;arch&#061;riscv64   <\/li>\n<li>\u200b\u200bperf\u200b\u200b&#xff1a;\u7edf\u8ba1CPU\u5468\u671f\u4e0e\u7f13\u5b58\u547d\u4e2d\u7387&#xff1a; perf stat -e cycles,instructions .\/output.elf   <\/li>\n<\/ul>\n<hr \/>\n<p>\u200b\u200b5. \u5b9e\u9645\u6848\u4f8b&#xff1a;\u5411\u91cf\u52a0\u6cd5\u4f18\u5316\u200b\u200b<\/p>\n<p>\u200b\u200b(1) C\u4ee3\u7801\u793a\u4f8b\u200b\u200b<\/p>\n<p>void vec_add(float *a, float *b, float *c, int n) {<br \/>\n    for (int i &#061; 0; i &lt; n; i&#043;&#043;) {<br \/>\n        c[i] &#061; a[i] &#043; b[i];<br \/>\n    }<br \/>\n}   <\/p>\n<p>\u200b\u200b(2) \u7f16\u8bd1\u4e0e\u5411\u91cf\u5316\u200b\u200b<\/p>\n<p>clang -target riscv64gc -march&#061;rv64gc -O3 \\\\<br \/>\n      -mllvm -enable-llvm-optzns -o vec_add.elf vec_add.c   <\/p>\n<ul>\n<li>\u200b\u200b\u751f\u6210\u7684\u6c47\u7f16\u4ee3\u7801\u200b\u200b&#xff1a; vec_add:<br \/>\n    vsetvli t0, a0, e32, m1  # \u8bbe\u7f6e\u5411\u91cf\u957f\u5ea6\u4e3a32\u4f4d&#xff0c;\u5206\u7ec4\u6a21\u5f0f<br \/>\n    vle32.v v1, (a0)        # \u52a0\u8f7da\u6570\u7ec4\u5230\u5411\u91cf\u5bc4\u5b58\u5668v1<br \/>\n    vle32.v v2, (a1)        # \u52a0\u8f7db\u6570\u7ec4\u5230\u5411\u91cf\u5bc4\u5b58\u5668v2<br \/>\n    vadd.vv v3, v1, v2      # \u5411\u91cf\u52a0\u6cd5<br \/>\n    vse32.v v3, (a2)        # \u5b58\u50a8\u7ed3\u679c\u5230c\u6570\u7ec4<br \/>\n    ret   <\/li>\n<\/ul>\n<hr \/>\n<p>\u200b\u200b6. \u5e38\u89c1\u95ee\u9898\u4e0e\u89e3\u51b3\u200b\u200b<\/p>\n<ul>\n<li>\u200b\u200b\u5411\u91cf\u6307\u4ee4\u4e0d\u751f\u6548\u200b\u200b&#xff1a;\n<ul>\n<li>\u68c0\u67e5\u7f16\u8bd1\u9009\u9879\u662f\u5426\u5305\u542b-march&#061;rv64gc\u548c-O3\u3002<\/li>\n<li>\u4f7f\u7528-Rpass-missed&#061;loop-vectorize\u5206\u6790\u672a\u5411\u91cf\u5316\u539f\u56e0\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u200b\u200b\u5185\u5b58\u8d8a\u754c\u200b\u200b&#xff1a;\n<ul>\n<li>\u901a\u8fc7-Wl,-z,max-page-size&#061;4096\u8c03\u6574\u5185\u5b58\u9875\u5bf9\u9f50\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u200b\u200b\u8de8\u5e73\u53f0\u517c\u5bb9\u6027\u200b\u200b&#xff1a;\n<ul>\n<li>\u4f7f\u7528-mabi&#061;ilp32\u517c\u5bb932\u4f4dRISC-V\u7cfb\u7edf\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<hr \/>\n<p>\u200b\u200b7. \u603b\u7ed3\u200b\u200b<\/p>\n<p>\u901a\u8fc7LLVM\/Clang\u7f16\u8bd1RISC-V\u4ee3\u7801\u65f6&#xff0c;\u9700\u91cd\u70b9\u5173\u6ce8&#xff1a;<\/p>\n<li>\u200b\u200b\u540e\u7aef\u914d\u7f6e\u200b\u200b&#xff1a;\u542f\u7528RISC-V Vector\u6269\u5c55&#xff08;-march&#061;rv64gc&#xff09;\u548c\u81ea\u52a8\u5411\u91cf\u5316&#xff08;-O3&#xff09;\u3002<\/li>\n<li>\u200b\u200b\u94fe\u63a5\u4f18\u5316\u200b\u200b&#xff1a;\u5408\u7406\u5212\u5206\u5185\u5b58\u533a\u57df&#xff0c;\u51cf\u5c11Flash\/RAM\u5360\u7528\u3002<\/li>\n<li>\u200b\u200b\u8c03\u8bd5\u5de5\u5177\u94fe\u200b\u200b&#xff1a;\u7ed3\u5408GDB\u548cLLVM-MCA\u5206\u6790\u6307\u4ee4\u6d41\u4e0e\u6027\u80fd\u74f6\u9888\u3002 RISC-V\u7684\u6a21\u5757\u5316\u7279\u6027\u4e0eLLVM\u7684\u7075\u6d3b\u6027\u7ed3\u5408&#xff0c;\u4e3a\u5f00\u53d1\u8005\u63d0\u4f9b\u4e86\u9ad8\u6548\u3001\u53ef\u6269\u5c55\u7684\u7f16\u8bd1\u89e3\u51b3\u65b9\u6848&#xff0c;\u5c24\u5176\u9002\u7528\u4e8eAI\u52a0\u901f\u3001\u5d4c\u5165\u5f0f\u7cfb\u7edf\u7b49\u573a\u666f\u3002<\/li>\n<p>\u00a0<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb805\u6b21\uff0c\u70b9\u8d5e11\u6b21\uff0c\u6536\u85cf17\u6b21\u3002\u200b\u3002<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[43,188,44],"topic":[],"class_list":["post-48656","post","type-post","status-publish","format-standard","hentry","category-server","tag-43","tag-188","tag-44"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u624b\u628a\u624b\u6559\u4f60\u73a9\u8f6c\u670d\u52a1\u5668\u82af\u7247\u67b6\u6784-\u200b\u200b6.2 LLVM\u4e0eRISC-V\u540e\u7aef\uff1a\u5982\u4f55\u7528Clang\u7f16\u8bd1RISC-V\u4ee3\u7801\uff1f\u200b - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/48656.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u624b\u628a\u624b\u6559\u4f60\u73a9\u8f6c\u670d\u52a1\u5668\u82af\u7247\u67b6\u6784-\u200b\u200b6.2 LLVM\u4e0eRISC-V\u540e\u7aef\uff1a\u5982\u4f55\u7528Clang\u7f16\u8bd1RISC-V\u4ee3\u7801\uff1f\u200b - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" 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