================
@@ -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,
+ /*pair_count=*/std::size(Query), /*cpu_count=*/0,
+ /*cpus=*/0, /*flags=*/0);
+ if (Ret != 0)
+ return false;
+
+ uint64_t BaseMask = Query[0].Value;
+ // Check whether RISCV_HWPROBE_BASE_BEHAVIOR_IMA is set.
+ if (BaseMask & 1) {
+ Features["i"] = true;
+ Features["m"] = true;
+ Features["a"] = true;
+ }
+
+ uint64_t ExtMask = Query[1].Value;
+ Features["f"] = ExtMask & (1 << 0); // RISCV_HWPROBE_IMA_FD
+ Features["d"] = ExtMask & (1 << 0); // RISCV_HWPROBE_IMA_FD
+ Features["c"] = ExtMask & (1 << 1); // RISCV_HWPROBE_IMA_C
+ Features["v"] = ExtMask & (1 << 2); // RISCV_HWPROBE_IMA_V
+ Features["zba"] = ExtMask & (1 << 3); // RISCV_HWPROBE_EXT_ZBA
+ Features["zbb"] = ExtMask & (1 << 4); // RISCV_HWPROBE_EXT_ZBB
+ Features["zbs"] = ExtMask & (1 << 5); // RISCV_HWPROBE_EXT_ZBS
+ Features["zicboz"] = ExtMask & (1 << 6); // RISCV_HWPROBE_EXT_ZICBOZ
+ Features["zbc"] = ExtMask & (1 << 7); // RISCV_HWPROBE_EXT_ZBC
+ Features["zbkb"] = ExtMask & (1 << 8); // RISCV_HWPROBE_EXT_ZBKB
+ Features["zbkc"] = ExtMask & (1 << 9); // RISCV_HWPROBE_EXT_ZBKC
+ Features["zbkx"] = ExtMask & (1 << 10); // RISCV_HWPROBE_EXT_ZBKX
+ Features["zknd"] = ExtMask & (1 << 11); // RISCV_HWPROBE_EXT_ZKND
+ Features["zkne"] = ExtMask & (1 << 12); // RISCV_HWPROBE_EXT_ZKNE
+ Features["zknh"] = ExtMask & (1 << 13); // RISCV_HWPROBE_EXT_ZKNH
+ Features["zksed"] = ExtMask & (1 << 14); // RISCV_HWPROBE_EXT_ZKSED
+ Features["zksh"] = ExtMask & (1 << 15); // RISCV_HWPROBE_EXT_ZKSH
+ Features["zkt"] = ExtMask & (1 << 16); // RISCV_HWPROBE_EXT_ZKT
+ Features["zvbb"] = ExtMask & (1 << 17); // RISCV_HWPROBE_EXT_ZVBB
+ Features["zvbc"] = ExtMask & (1 << 18); // RISCV_HWPROBE_EXT_ZVBC
+ Features["zvkb"] = ExtMask & (1 << 19); // RISCV_HWPROBE_EXT_ZVKB
+ Features["zvkg"] = ExtMask & (1 << 20); // RISCV_HWPROBE_EXT_ZVKG
+ Features["zvkned"] = ExtMask & (1 << 21); // RISCV_HWPROBE_EXT_ZVKNED
+ Features["zvknha"] = ExtMask & (1 << 22); // RISCV_HWPROBE_EXT_ZVKNHA
+ Features["zvknhb"] = ExtMask & (1 << 23); // RISCV_HWPROBE_EXT_ZVKNHB
+ Features["zvksed"] = ExtMask & (1 << 24); // RISCV_HWPROBE_EXT_ZVKSED
+ Features["zvksh"] = ExtMask & (1 << 25); // RISCV_HWPROBE_EXT_ZVKSH
+ Features["zvkt"] = ExtMask & (1 << 26); // RISCV_HWPROBE_EXT_ZVKT
+ Features["zfh"] = ExtMask & (1 << 27); // RISCV_HWPROBE_EXT_ZFH
+ Features["zfhmin"] = ExtMask & (1 << 28); // RISCV_HWPROBE_EXT_ZFHMIN
+ Features["zihintntl"] = ExtMask & (1 << 29); // RISCV_HWPROBE_EXT_ZIHINTNTL
+ Features["zvfh"] = ExtMask & (1 << 30); // RISCV_HWPROBE_EXT_ZVFH
+ Features["zvfhmin"] = ExtMask & (1ULL << 31); // RISCV_HWPROBE_EXT_ZVFHMIN
+ Features["zfa"] = ExtMask & (1ULL << 32); // RISCV_HWPROBE_EXT_ZFA
+ // TODO: set ztso when it is no longer experimental.
+ // Features["ztso"] = ExtMask & (1ULL << 33); // RISCV_HWPROBE_EXT_ZTSO
----------------
preames wrote:
I agree that leaving this as a TODO is the right thing to do right now.
https://github.com/llvm/llvm-project/pull/94352
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