[RISCV] Make Zicntr and Zihpm imply Zicsr.

[craig.topper]

Summary

Zicntr and Zihpm are names for groups of CSRs so they should imply
that CSRs exist.

[kito-cheng]

LGTM

[asb]

LGTM.

[craig.topper]

Forgot to make this dependent on @reames patch D144215

llvm/lib/Support/RISCVISAInfo.cpp

 static const char *ImpliedExtsZcb[] = {"zca"};
 static const char *ImpliedExtsZdinx[] = {"zfinx"};
 static const char *ImpliedExtsZfa[] = {"f"};
 static const char *ImpliedExtsZfh[] = {"f"};
 static const char *ImpliedExtsZfhmin[] = {"f"};
 static const char *ImpliedExtsZfinx[] = {"zicsr"};
 static const char *ImpliedExtsZhinx[] = {"zfinx"};
 static const char *ImpliedExtsZhinxmin[] = {"zfinx"};
+static const char *ImpliedExtsZicntr[] = {"zicsr"};
+static const char *ImpliedExtsZihpm[] = {"zicsr"};
 static const char *ImpliedExtsZk[] = {"zkn", "zkt", "zkr"};
 static const char *ImpliedExtsZkn[] = {"zbkb", "zbkc", "zbkx",
                                        "zkne", "zknd", "zknh"};
 static const char *ImpliedExtsZks[] = {"zbkb", "zbkc", "zbkx", "zksed", "zksh"};
 static const char *ImpliedExtsZve32f[] = {"zve32x"};
 static const char *ImpliedExtsZve32x[] = {"zvl32b", "zicsr"};
 static const char *ImpliedExtsZve64d[] = {"zve64f"};
 static const char *ImpliedExtsZve64f[] = {"zve64x", "zve32f"};
static constexpr ImpliedExtsEntry ImpliedExts[] = {
     {{"zcb"}, {ImpliedExtsZcb}},
     {{"zdinx"}, {ImpliedExtsZdinx}},
     {{"zfa"}, {ImpliedExtsZfa}},
     {{"zfh"}, {ImpliedExtsZfh}},
     {{"zfhmin"}, {ImpliedExtsZfhmin}},
     {{"zfinx"}, {ImpliedExtsZfinx}},
     {{"zhinx"}, {ImpliedExtsZhinx}},
     {{"zhinxmin"}, {ImpliedExtsZhinxmin}},
+    {{"zicntr"}, {ImpliedExtsZicntr}},
+    {{"zihpm"}, {ImpliedExtsZihpm}},
     {{"zk"}, {ImpliedExtsZk}},
     {{"zkn"}, {ImpliedExtsZkn}},
     {{"zks"}, {ImpliedExtsZks}},
     {{"zve32f"}, {ImpliedExtsZve32f}},
     {{"zve32x"}, {ImpliedExtsZve32x}},
     {{"zve64d"}, {ImpliedExtsZve64d}},
     {{"zve64f"}, {ImpliedExtsZve64f}},
     {{"zve64x"}, {ImpliedExtsZve64x}},

llvm/lib/Target/RISCV/RISCVFeatures.td

def FeatureStdExtZifencei
     : SubtargetFeature<"zifencei", "HasStdExtZifencei", "true",
                        "'zifencei' (fence.i)">;
 def HasStdExtZifencei : Predicate<"Subtarget->hasStdExtZifencei()">,
                                    AssemblerPredicate<(all_of FeatureStdExtZifencei),
                                    "'Zifencei' (fence.i)">;
 
 def FeatureStdExtZicntr
     : SubtargetFeature<"zicntr", "HasStdExtZicntr", "true",
-                       "'zicntr' (Base Counters and Timers)">;
+                       "'zicntr' (Base Counters and Timers)",
+                       [FeatureStdExtZicsr]>;
 
 def FeatureStdExtZihpm
     : SubtargetFeature<"zihpm", "HasStdExtZihpm", "true",
-                       "'zihpm' (Hardware Performance Counters)">;
+                       "'zihpm' (Hardware Performance Counters)",
+                       [FeatureStdExtZicsr]>;
 
 def FeatureStdExtZfhmin
     : SubtargetFeature<"zfhmin", "HasStdExtZfhmin", "true",
                        "'Zfhmin' (Half-Precision Floating-Point Minimal)",
                        [FeatureStdExtF]>;
 def HasStdExtZfhmin : Predicate<"Subtarget->hasStdExtZfhmin()">,
                              AssemblerPredicate<(all_of FeatureStdExtZfhmin),
                              "'Zfhmin' (Half-Precision Floating-Point Minimal)">;

llvm/test/CodeGen/RISCV/attributes.ll

 ; RV32XTHEADMEMPAIR: .attribute 5, "rv32i2p1_xtheadmempair1p0"
 ; RV32XTHEADSYNC: .attribute 5, "rv32i2p1_xtheadsync1p0"
 ; RV32ZCA: .attribute 5, "rv32i2p1_zca1p0"
 ; RV32ZCB: .attribute 5, "rv32i2p1_zca1p0_zcb1p0"
 ; RV32ZCD: .attribute 5, "rv32i2p1_zcd1p0"
 ; RV32ZCF: .attribute 5, "rv32i2p1_zcf1p0"
 ; RV32ZICSR: .attribute 5, "rv32i2p1_zicsr2p0"
 ; RV32ZIFENCEI: .attribute 5, "rv32i2p1_zifencei2p0"
-; RV32ZICNTR: .attribute 5, "rv32i2p1_zicntr1p0"
-; RV32ZIHPM: .attribute 5, "rv32i2p1_zihpm1p0"
+; RV32ZICNTR: .attribute 5, "rv32i2p1_zicntr1p0_zicsr2p0"
+; RV32ZIHPM: .attribute 5, "rv32i2p1_zicsr2p0_zihpm1p0"
 ; RV32ZFA: .attribute 5, "rv32i2p1_f2p2_zicsr2p0_zfa0p2"
 ; RV32ZVBB: .attribute 5, "rv32i2p1_zicsr2p0_zvbb0p5_zve32x1p0_zvl32b1p0"
 ; RV32ZVBC: .attribute 5, "rv32i2p1_zicsr2p0_zvbc0p5_zve32x1p0_zve64x1p0_zvl32b1p0_zvl64b1p0"
 ; RV32ZVKG: .attribute 5, "rv32i2p1_zicsr2p0_zve32x1p0_zvkg0p5_zvl32b1p0"
 ; RV32ZVKN: .attribute 5, "rv32i2p1_zicsr2p0_zvbb0p5_zvbc0p5_zve32x1p0_zve64x1p0_zvkn0p5_zvkned0p5_zvknha0p5_zvknhb0p5_zvkt0p5_zvl32b1p0_zvl64b1p0"
 ; RV32ZVKNED: .attribute 5, "rv32i2p1_zicsr2p0_zve32x1p0_zvkned0p5_zvl32b1p0"
 ; RV32ZVKNG: .attribute 5, "rv32i2p1_zicsr2p0_zvbb0p5_zvbc0p5_zve32x1p0_zve64x1p0_zvkg0p5_zvkn0p5_zvkned0p5_zvkng0p5_zvknha0p5_zvknhb0p5_zvkt0p5_zvl32b1p0_zvl64b1p0"
 ; RV32ZVKNHA: .attribute 5, "rv32i2p1_zicsr2p0_zve32x1p0_zvknha0p5_zvl32b1p0"

 ; RV64XTHEADSYNC: .attribute 5, "rv64i2p1_xtheadsync1p0"
 ; RV64XTHEADVDOT: .attribute 5, "rv64i2p1_f2p2_d2p2_v1p0_zicsr2p0_zve32f1p0_zve32x1p0_zve64d1p0_zve64f1p0_zve64x1p0_zvl128b1p0_zvl32b1p0_zvl64b1p0_xtheadvdot1p0"
 ; RV64ZTSO: .attribute 5, "rv64i2p1_ztso0p1"
 ; RV64ZCA: .attribute 5, "rv64i2p1_zca1p0"
 ; RV64ZCB: .attribute 5, "rv64i2p1_zca1p0_zcb1p0"
 ; RV64ZCD: .attribute 5, "rv64i2p1_zcd1p0"
 ; RV64ZICSR: .attribute 5, "rv64i2p1_zicsr2p0"
 ; RV64ZIFENCEI: .attribute 5, "rv64i2p1_zifencei2p0"
-; RV64ZICNTR: .attribute 5, "rv64i2p1_zicntr1p0"
-; RV64ZIHPM: .attribute 5, "rv64i2p1_zihpm1p0"
+; RV64ZICNTR: .attribute 5, "rv64i2p1_zicntr1p0_zicsr2p0"
+; RV64ZIHPM: .attribute 5, "rv64i2p1_zicsr2p0_zihpm1p0"
 ; RV64ZFA: .attribute 5, "rv64i2p1_f2p2_zicsr2p0_zfa0p2"
 ; RV64ZVBB: .attribute 5, "rv64i2p1_zicsr2p0_zvbb0p5_zve32x1p0_zvl32b1p0"
 ; RV64ZVBC: .attribute 5, "rv64i2p1_zicsr2p0_zvbc0p5_zve32x1p0_zve64x1p0_zvl32b1p0_zvl64b1p0"
 ; RV64ZVKG: .attribute 5, "rv64i2p1_zicsr2p0_zve32x1p0_zvkg0p5_zvl32b1p0"
 ; RV64ZVKN: .attribute 5, "rv64i2p1_zicsr2p0_zvbb0p5_zvbc0p5_zve32x1p0_zve64x1p0_zvkn0p5_zvkned0p5_zvknha0p5_zvknhb0p5_zvkt0p5_zvl32b1p0_zvl64b1p0"
 ; RV64ZVKNED: .attribute 5, "rv64i2p1_zicsr2p0_zve32x1p0_zvkned0p5_zvl32b1p0"
 ; RV64ZVKNG: .attribute 5, "rv64i2p1_zicsr2p0_zvbb0p5_zvbc0p5_zve32x1p0_zve64x1p0_zvkg0p5_zvkn0p5_zvkned0p5_zvkng0p5_zvknha0p5_zvknhb0p5_zvkt0p5_zvl32b1p0_zvl64b1p0"
 ; RV64ZVKNHA: .attribute 5, "rv64i2p1_zicsr2p0_zve32x1p0_zvknha0p5_zvl32b1p0"