[RISCV] Add sched classes for Zbb integer min max instructions

Author: michaelmaitland

llvm/lib/Target/RISCV/RISCVInstrInfoZb.td

@@ -424,13 +424,13 @@ def CLMULH : ALU_rr<0b0000101, 0b011, "clmulh", Commutable=1>,
 
 let Predicates = [HasStdExtZbb] in {
 def MIN  : ALU_rr<0b0000101, 0b100, "min", Commutable=1>,
-           Sched<[WriteIALU, ReadIALU, ReadIALU]>;
+           Sched<[WriteIMinMax, ReadIMinMax, ReadIMinMax]>;
 def MINU : ALU_rr<0b0000101, 0b101, "minu", Commutable=1>,
-           Sched<[WriteIALU, ReadIALU, ReadIALU]>;
+           Sched<[WriteIMinMax, ReadIMinMax, ReadIMinMax]>;
 def MAX  : ALU_rr<0b0000101, 0b110, "max", Commutable=1>,
-           Sched<[WriteIALU, ReadIALU, ReadIALU]>;
+           Sched<[WriteIMinMax, ReadIMinMax, ReadIMinMax]>;
 def MAXU : ALU_rr<0b0000101, 0b111, "maxu", Commutable=1>,
-           Sched<[WriteIALU, ReadIALU, ReadIALU]>;
+           Sched<[WriteIMinMax, ReadIMinMax, ReadIMinMax]>;
 } // Predicates = [HasStdExtZbb]
 
 let Predicates = [HasStdExtZbkb] in {

llvm/lib/Target/RISCV/RISCVSchedSiFive7.td

@@ -186,7 +186,7 @@ class SiFive7AnyToGPRBypass<SchedRead read, int cycles = 2>
                                  WriteBEXT, WriteBEXTI,
                                  WriteCLZ, WriteCLZ32, WriteCTZ, WriteCTZ32,
                                  WriteCPOP, WriteCPOP32,
-                                 WriteREV8, WriteORCB, WriteSFB,
+                                 WriteREV8, WriteORCB, WriteIMinMax, WriteSFB,
                                  WriteIMul, WriteIMul32,
                                  WriteIDiv, WriteIDiv32,
                                  WriteIRem, WriteIRem32,
@@ -305,6 +305,8 @@ def : WriteRes<WriteCPOP32, [SiFive7PipeB]>;
 // orc.b is in the late-B ALU.
 def : WriteRes<WriteORCB, [SiFive7PipeB]>;
 
+def : WriteRes<WriteIMinMax, [SiFive7PipeAB]>;
+
 // rev8 is in the late-A and late-B ALUs.
 def : WriteRes<WriteREV8, [SiFive7PipeAB]>;
 
@@ -1041,6 +1043,7 @@ def : SiFive7AnyToGPRBypass<ReadCTZ32>;
 def : ReadAdvance<ReadCPOP, 0>;
 def : ReadAdvance<ReadCPOP32, 0>;
 def : SiFive7AnyToGPRBypass<ReadORCB>;
+def : SiFive7AnyToGPRBypass<ReadIMinMax>;
 def : SiFive7AnyToGPRBypass<ReadREV8>;
 def : SiFive7AnyToGPRBypass<ReadSHXADD>;
 def : SiFive7AnyToGPRBypass<ReadSHXADD32>;

llvm/lib/Target/RISCV/RISCVSchedSiFiveP400.td

@@ -109,6 +109,7 @@ def : WriteRes<WriteCTZ, [SiFiveP400IntArith]>;
 def : WriteRes<WriteCTZ32, [SiFiveP400IntArith]>;
 
 def : WriteRes<WriteORCB, [SiFiveP400IntArith]>;
+def : WriteRes<WriteIMinMax, [SiFiveP400IntArith]>;
 
 def : WriteRes<WriteREV8, [SiFiveP400IntArith]>;
 
@@ -349,6 +350,7 @@ def : ReadAdvance<ReadCTZ32, 0>;
 def : ReadAdvance<ReadCPOP, 0>;
 def : ReadAdvance<ReadCPOP32, 0>;
 def : ReadAdvance<ReadORCB, 0>;
+def : ReadAdvance<ReadIMinMax, 0>;
 def : ReadAdvance<ReadREV8, 0>;
 def : ReadAdvance<ReadSHXADD, 0>;
 def : ReadAdvance<ReadSHXADD32, 0>;

llvm/lib/Target/RISCV/RISCVSchedXiangShanNanHu.td

@@ -85,6 +85,7 @@ def : WriteRes<WriteRotateImm32, [XS2ALU]>;
 def : WriteRes<WriteRotateReg, [XS2ALU]>;
 def : WriteRes<WriteRotateReg32, [XS2ALU]>;
 def : WriteRes<WriteORCB, [XS2ALU]>;
+def : WriteRes<WriteIMinMax, [XS2ALU]>;
 def : WriteRes<WriteREV8, [XS2ALU]>;
 
 // Zbkb
@@ -288,6 +289,7 @@ def : ReadAdvance<ReadCTZ32, 0>;
 def : ReadAdvance<ReadCPOP, 0>;
 def : ReadAdvance<ReadCPOP32, 0>;
 def : XS2LoadToALUBypass<ReadORCB>;
+def : XS2LoadToALUBypass<ReadIMinMax>;
 def : XS2LoadToALUBypass<ReadREV8>;
 // Zbkc
 def : ReadAdvance<ReadCLMUL, 0>;

llvm/lib/Target/RISCV/RISCVScheduleZb.td

@@ -25,6 +25,7 @@ def WriteCPOP        : SchedWrite;
 def WriteCPOP32      : SchedWrite;
 def WriteREV8        : SchedWrite;
 def WriteORCB        : SchedWrite;
+def WriteIMinMax     : SchedWrite;
 
 // Zbc extension
 def WriteCLMUL       : SchedWrite; // CLMUL/CLMULR/CLMULH
@@ -63,6 +64,7 @@ def ReadCPOP        : SchedRead;
 def ReadCPOP32      : SchedRead;
 def ReadREV8        : SchedRead;
 def ReadORCB        : SchedRead;
+def ReadIMinMax     : SchedRead;
 
 // Zbc extension
 def ReadCLMUL       : SchedRead; // CLMUL/CLMULR/CLMULH
@@ -106,6 +108,7 @@ def : WriteRes<WriteCPOP, []>;
 def : WriteRes<WriteCPOP32, []>;
 def : WriteRes<WriteREV8, []>;
 def : WriteRes<WriteORCB, []>;
+def : WriteRes<WriteIMinMax, []>;
 
 def : ReadAdvance<ReadRotateImm, 0>;
 def : ReadAdvance<ReadRotateImm32, 0>;
@@ -119,6 +122,7 @@ def : ReadAdvance<ReadCPOP, 0>;
 def : ReadAdvance<ReadCPOP32, 0>;
 def : ReadAdvance<ReadREV8, 0>;
 def : ReadAdvance<ReadORCB, 0>;
+def : ReadAdvance<ReadIMinMax, 0>;
 }
 }