kito-cheng accepted this revision.
kito-cheng added a comment.
This revision is now accepted and ready to land.

LGTM



================
Comment at: clang/test/Driver/riscv-features.c:41
+// DEFAULT: "-target-feature" "-unaligned-scalar-mem"
+// DEFAULT-NOT: "-target-feature" "+unaligned-scalar-mem"
+
----------------
wangpc wrote:
> arichardson wrote:
> > This looks a bit fragile, can we just check all -target-feature flags 
> > instead and add --implicit-check-not='-target-feature" to Filecheck?
> I'm so sorry that I may not get what you mean, can you tell me what kind of 
> change I need to make?
I would suggest keep this check simple as it, because the `-target-feature` 
list for RISC-V is very loooooong, the list will increase when we add new 
extension, and add new extension is kind of relative frequently happened for 
RISC-V, check the full feature list will increase the maintenance burden for 
adding new extensions IMO.

e.g.

```
$ clang --target=riscv32-unknown-elf -### %s -march=rv32gv -mstrict-align ~/x.c
 "/scratch1/kitoc/llvm-workspace/build/bin/clang-18" "-cc1" "-triple" 
"riscv32-unknown-unknown-elf" "-emit-obj" "-mrelax-all" "-dumpdir" "a-" 
"-disable-free" "-clear-ast-before-backend" "-main-file-name" "x.c" 
"-mrelocation-model" "static" "-mframe-pointer=all" "-fmath-errno" 
"-ffp-contract=on" "-fno-rounding-math" "-mconstructor-aliases" 
"-nostdsysteminc" "-target-cpu" "generic-rv32" "-target-feature" "+m" 
"-target-feature" "+a" "-target-feature" "+f" "-target-feature" "+d" 
"-target-feature" "+v" "-target-feature" "+zicsr" "-target-feature" "+zifencei" 
"-target-feature" "+zve32f" "-target-feature" "+zve32x" "-target-feature" 
"+zve64d" "-target-feature" "+zve64f" "-target-feature" "+zve64x" 
"-target-feature" "+zvl128b" "-target-feature" "+zvl32b" "-target-feature" 
"+zvl64b" "-target-feature" "-c" "-target-feature" "-e" "-target-feature" "-h" 
"-target-feature" "-svinval" "-target-feature" "-svnapot" "-target-feature" 
"-svpbmt" "-target-feature" "-xcvalu" "-target-feature" "-xcvbi" 
"-target-feature" "-xcvbitmanip" "-target-feature" "-xcvmac" "-target-feature" 
"-xcvsimd" "-target-feature" "-xsfcie" "-target-feature" "-xsfvcp" 
"-target-feature" "-xtheadba" "-target-feature" "-xtheadbb" "-target-feature" 
"-xtheadbs" "-target-feature" "-xtheadcmo" "-target-feature" "-xtheadcondmov" 
"-target-feature" "-xtheadfmemidx" "-target-feature" "-xtheadmac" 
"-target-feature" "-xtheadmemidx" "-target-feature" "-xtheadmempair" 
"-target-feature" "-xtheadsync" "-target-feature" "-xtheadvdot" 
"-target-feature" "-xventanacondops" "-target-feature" "-zawrs" 
"-target-feature" "-zba" "-target-feature" "-zbb" "-target-feature" "-zbc" 
"-target-feature" "-zbkb" "-target-feature" "-zbkc" "-target-feature" "-zbkx" 
"-target-feature" "-zbs" "-target-feature" "-zca" "-target-feature" "-zcb" 
"-target-feature" "-zcd" "-target-feature" "-zce" "-target-feature" "-zcf" 
"-target-feature" "-zcmp" "-target-feature" "-zcmt" "-target-feature" "-zdinx" 
"-target-feature" "-zfh" "-target-feature" "-zfhmin" "-target-feature" "-zfinx" 
"-target-feature" "-zhinx" "-target-feature" "-zhinxmin" "-target-feature" 
"-zicbom" "-target-feature" "-zicbop" "-target-feature" "-zicboz" 
"-target-feature" "-zicntr" "-target-feature" "-zihintpause" "-target-feature" 
"-zihpm" "-target-feature" "-zk" "-target-feature" "-zkn" "-target-feature" 
"-zknd" "-target-feature" "-zkne" "-target-feature" "-zknh" "-target-feature" 
"-zkr" "-target-feature" "-zks" "-target-feature" "-zksed" "-target-feature" 
"-zksh" "-target-feature" "-zkt" "-target-feature" "-zmmul" "-target-feature" 
"-zvfh" "-target-feature" "-zvl1024b" "-target-feature" "-zvl16384b" 
"-target-feature" "-zvl2048b" "-target-feature" "-zvl256b" "-target-feature" 
"-zvl32768b" "-target-feature" "-zvl4096b" "-target-feature" "-zvl512b" 
"-target-feature" "-zvl65536b" "-target-feature" "-zvl8192b" "-target-feature" 
"-experimental-smaia" "-target-feature" "-experimental-ssaia" "-target-feature" 
"-experimental-zacas" "-target-feature" "-experimental-zfa" "-target-feature" 
"-experimental-zfbfmin" "-target-feature" "-experimental-zicond" 
"-target-feature" "-experimental-zihintntl" "-target-feature" 
"-experimental-ztso" "-target-feature" "-experimental-zvbb" "-target-feature" 
"-experimental-zvbc" "-target-feature" "-experimental-zvfbfmin" 
"-target-feature" "-experimental-zvfbfwma" "-target-feature" 
"-experimental-zvkg" "-target-feature" "-experimental-zvkn" "-target-feature" 
"-experimental-zvknc" "-target-feature" "-experimental-zvkned" 
"-target-feature" "-experimental-zvkng" "-target-feature" 
"-experimental-zvknha" "-target-feature" "-experimental-zvknhb" 
"-target-feature" "-experimental-zvks" "-target-feature" "-experimental-zvksc" 
"-target-feature" "-experimental-zvksed" "-target-feature" 
"-experimental-zvksg" "-target-feature" "-experimental-zvksh" "-target-feature" 
"-experimental-zvkt" "-target-feature" "+relax" "-target-feature" 
"-save-restore" "-target-abi" "ilp32d" "-msmall-data-limit" "8" 
"-debugger-tuning=gdb" 
"-fcoverage-compilation-dir=/home/kitoc/llvm-workspace/llvm-project/clang/test" 
"-resource-dir" "/scratch1/kitoc/llvm-workspace/build/lib/clang/18" 
"-internal-isystem" "/scratch1/kitoc/llvm-workspace/build/lib/clang/18/include" 
"-internal-isystem" 
"/scratch1/kitoc/llvm-workspace/build/bin/../lib/clang-runtimes/riscv32-unknown-elf/include"
 "-fdebug-compilation-dir=/home/kitoc/llvm-workspace/llvm-project/clang/test" 
"-ferror-limit" "19" "-fno-signed-char" "-fgnuc-version=4.2.1" 
"-fcolor-diagnostics" "-faddrsig" "-o" "/tmp/x-83967d.o" "-x" "c" 
"/home/kitoc/x.c"
 "/home/kitoc/llvm-workspace/build/bin/ld.lld" "/tmp/x-83967d.o" "-Bstatic" 
"-L/scratch1/kitoc/llvm-workspace/build/bin/../lib/clang-runtimes/riscv32-unknown-elf/lib"
 
"-L/scratch1/kitoc/llvm-workspace/build/bin/../lib/clang-runtimes/riscv32-unknown-elf/lib"
 "-L/scratch1/kitoc/llvm-workspace/build/lib/clang/18/lib/baremetal" "-lc" 
"-lm" "-lclang_rt.builtins-riscv32" "-X" "-o" "a.out"

```


Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D155456/new/

https://reviews.llvm.org/D155456

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