我想找到一些类似于 gcc 的 clang/LLVM 调试选项-fdump-tree-all-all -fdump-rtl-all-all -fdump-ipa-all-all。
基本上我希望在每次优化通过之前和之后都有一个 LLVM IR 转储，从 clang 和代码生成的所有阶段（后端阶段、选择 DAG、ISEL-SDNode、寄存器分配、MCInsts ）。
我只能找到 clang 的-ccc-print-phases，但它只会打印高级阶段名称，例如 preprocess-compile-assemble-link；但没有任何 IR 转储。
LLVM论文中还有一条指令的生命周期，-cc1-ast-dump可以选择转储 clang AST，但我想要更多，尤其是对于 codegen。
您似乎已经发现了如何在 Clang AST 级别和 LLVM IR 级别进行转储。对于 codegen，以下内容很有用：
-debug有关指令选择和后续阶段的详细文本转储。此外，-view*-dags显示（弹出）DAG：
$ llc -help-hidden|grep dags
-view-dag-combine-lt-dags - Pop up a window to show dags before the post legalize types dag combine pass
-view-dag-combine1-dags - Pop up a window to show dags before the first dag combine pass
-view-dag-combine2-dags - Pop up a window to show dags before the second dag combine pass
-view-isel-dags - Pop up a window to show isel dags as they are selected
-view-legalize-dags - Pop up a window to show dags before legalize
-view-legalize-types-dags - Pop up a window to show dags before legalize types
-view-misched-dags - Pop up a window to show MISched dags after they are processed
-view-sched-dags - Pop up a window to show sched dags as they are processed
-view-sunit-dags - Pop up a window to show SUnit dags after they are processed
如果您没有配置和编译带有 graphviz 支持的 LLVM，这些可能不会显示。
不完全关于您的问题，但要查看应用的通行证，您可以执行以下操作：
clang test.c -Ofast -march=core-avx2 -mllvm -debug-pass=Arguments
你会看到类似的东西：
Pass Arguments: -datalayout -notti -basictti -x86tti -targetlibinfo -jump-instr-table-info -targetpassconfig -no-aa -tbaa -scoped-noalias -basicaa -collector-metadata -machinemoduleinfo -machine-branch-prob -jump-instr-tables -verify -verify-di -domtree -loops -loop-simplify -scalar-evolution -iv-users -loop-reduce -gc-lowering -unreachableblockelim -consthoist -partially-inline-libcalls -codegenprepare -verify-di -stack-protector -verify -domtree -loops -branch-prob -machinedomtree -expand-isel-pseudos -tailduplication -opt-phis -machinedomtree -slotindexes -stack-coloring -localstackalloc -dead-mi-elimination -machinedomtree -machine-loops -machine-trace-metrics -early-ifcvt -machinelicm -machine-cse -machine-sink -peephole-opts -dead-mi-elimination -processimpdefs -unreachable-mbb-elimination -livevars -machinedomtree -machine-loops -phi-node-elimination -twoaddressinstruction -slotindexes -liveintervals -simple-register-coalescing -misched -machine-block-freq -livedebugvars -livestacks -virtregmap -liveregmatrix -edge-bundles -spill-code-placement -virtregrewriter -stack-slot-coloring -machinelicm -edge-bundles -prologepilog -machine-block-freq -branch-folder -tailduplication -machine-cp -postrapseudos -machinedomtree -machine-loops -post-RA-sched -gc-analysis -machine-block-freq -block-placement2 -stackmap-liveness -machinedomtree -machine-loops
我llvm-gcc-4.2在山狮上使用并-fdump-tree-all工作。
gcc -fdump-tree-all -o test file1.c file2.c file1.h -I .