================
@@ -2002,6 +2003,76 @@ bool sys::getHostCPUFeatures(StringMap<bool> &Features) {
return true;
}
+#elif defined(__linux__) && defined(__riscv)
+// struct riscv_hwprobe
+struct RISCVHwProbe {
+ int64_t Key;
+ uint64_t Value;
+};
+bool sys::getHostCPUFeatures(StringMap<bool> &Features) {
+ RISCVHwProbe Query[]{{/*RISCV_HWPROBE_KEY_BASE_BEHAVIOR=*/3, 0},
+ {/*RISCV_HWPROBE_KEY_IMA_EXT_0=*/4, 0}};
+ int Ret = syscall(/*__NR_riscv_hwprobe=*/258, /*pairs=*/Query,
----------------
dtcxzyw wrote:
Currently `sys::getHostCPUFeatures` has three callers:
+ clang -> `riscv::getRISCVTargetFeatures`
+ llvm-tools -> `codegen::getFeaturesStr`
+ JIT users -> `JITTargetMachineBuilder::detectHost`
I don't think there are any opportunities to reuse the result.
BTW, https://github.com/llvm/llvm-project/pull/85790 may benefit from the vDSO
symbol, but it implements caching itself.
I didn't use the glibc call `__riscv_hwprobe` since `sys/hwprobe.h` was
unavailable on my RV board :(
https://github.com/llvm/llvm-project/pull/94352
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