[llvm] [RISCV] Merge a some of the Sifive decoder tables. (PR #128794)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-backend-risc-v

Author: Craig Topper (topperc)

<details>
<summary>Changes</summary>

This makes a single table for vector and another table for system. I left sf.cease out of system because its not in custom encoding space. The other system instructions are in the custom part of OPC_SYSTEM.

---
Full diff: https://github.com/llvm/llvm-project/pull/128794.diff


2 Files Affected:

- (modified) llvm/lib/Target/RISCV/Disassembler/RISCVDisassembler.cpp (+13-20) 
- (modified) llvm/lib/Target/RISCV/RISCVInstrInfoXSf.td (+7-7) 


``````````diff
diff --git a/llvm/lib/Target/RISCV/Disassembler/RISCVDisassembler.cpp b/llvm/lib/Target/RISCV/Disassembler/RISCVDisassembler.cpp
index 1025b57369f4a..9b3104e86a8da 100644
--- a/llvm/lib/Target/RISCV/Disassembler/RISCVDisassembler.cpp
+++ b/llvm/lib/Target/RISCV/Disassembler/RISCVDisassembler.cpp
@@ -631,6 +631,15 @@ static constexpr FeatureBitset XqciFeatureGroup = {
     RISCV::FeatureVendorXqcisls,
 };
 
+static constexpr FeatureBitset XSfVectorGroup = {
+    RISCV::FeatureVendorXSfvcp, RISCV::FeatureVendorXSfvqmaccdod,
+    RISCV::FeatureVendorXSfvqmaccqoq, RISCV::FeatureVendorXSfvfwmaccqqq,
+    RISCV::FeatureVendorXSfvfnrclipxfqf};
+static constexpr FeatureBitset XSfSystemGroup = {
+    RISCV::FeatureVendorXSiFivecdiscarddlone,
+    RISCV::FeatureVendorXSiFivecflushdlone,
+};
+
 DecodeStatus RISCVDisassembler::getInstruction32(MCInst &MI, uint64_t &Size,
                                                  ArrayRef<uint8_t> Bytes,
                                                  uint64_t Address,
@@ -677,26 +686,10 @@ DecodeStatus RISCVDisassembler::getInstruction32(MCInst &MI, uint64_t &Size,
                         DecoderTableXTHeadSync32, "XTHeadSync");
   TRY_TO_DECODE_FEATURE(RISCV::FeatureVendorXTHeadVdot,
                         DecoderTableXTHeadVdot32, "XTHeadVdot");
-  TRY_TO_DECODE_FEATURE(RISCV::FeatureVendorXSfvcp, DecoderTableXSfvcp32,
-                        "SiFive VCIX");
-  TRY_TO_DECODE_FEATURE(
-      RISCV::FeatureVendorXSfvqmaccdod, DecoderTableXSfvqmaccdod32,
-      "SiFive Matrix Multiplication (2x8 and 8x2) Instruction");
-  TRY_TO_DECODE_FEATURE(
-      RISCV::FeatureVendorXSfvqmaccqoq, DecoderTableXSfvqmaccqoq32,
-      "SiFive Matrix Multiplication (4x8 and 8x4) Instruction");
-  TRY_TO_DECODE_FEATURE(RISCV::FeatureVendorXSfvfwmaccqqq,
-                        DecoderTableXSfvfwmaccqqq32,
-                        "SiFive Matrix Multiplication Instruction");
-  TRY_TO_DECODE_FEATURE(RISCV::FeatureVendorXSfvfnrclipxfqf,
-                        DecoderTableXSfvfnrclipxfqf32,
-                        "SiFive FP32-to-int8 Ranged Clip Instructions");
-  TRY_TO_DECODE_FEATURE(RISCV::FeatureVendorXSiFivecdiscarddlone,
-                        DecoderTableXSiFivecdiscarddlone32,
-                        "SiFive sf.cdiscard.d.l1");
-  TRY_TO_DECODE_FEATURE(RISCV::FeatureVendorXSiFivecflushdlone,
-                        DecoderTableXSiFivecflushdlone32,
-                        "SiFive sf.cflush.d.l1");
+  TRY_TO_DECODE_FEATURE_ANY(XSfVectorGroup, DecoderTableXSfvector32,
+                            "SiFive vector extensions");
+  TRY_TO_DECODE_FEATURE_ANY(XSfSystemGroup, DecoderTableXSfsystem32,
+                            "SiFive system extensions");
   TRY_TO_DECODE_FEATURE(RISCV::FeatureVendorXSfcease, DecoderTableXSfcease32,
                         "SiFive sf.cease");
   TRY_TO_DECODE_FEATURE(RISCV::FeatureVendorXMIPSLSP, DecoderTableXmipslsp32,
diff --git a/llvm/lib/Target/RISCV/RISCVInstrInfoXSf.td b/llvm/lib/Target/RISCV/RISCVInstrInfoXSf.td
index 0654f1ac19a82..da55ee9d0c438 100644
--- a/llvm/lib/Target/RISCV/RISCVInstrInfoXSf.td
+++ b/llvm/lib/Target/RISCV/RISCVInstrInfoXSf.td
@@ -184,7 +184,7 @@ class CustomSiFiveVFNRCLIP<bits<6> funct6, RISCVVFormat opv, string opcodestr>
 }
 
 let Predicates = [HasVendorXSfvcp], mayLoad = 0, mayStore = 0,
-    hasSideEffects = 1, hasNoSchedulingInfo = 1, DecoderNamespace = "XSfvcp" in {
+    hasSideEffects = 1, hasNoSchedulingInfo = 1, DecoderNamespace = "XSfvector" in {
   defm X   : CustomSiFiveVCIX<"x",   VCIX_X,   uimm5, uimm5, GPR>,   Sched<[]>;
   defm I   : CustomSiFiveVCIX<"i",   VCIX_X,   uimm5, uimm5, simm5>, Sched<[]>;
   defm XV  : CustomSiFiveVCIX<"xv",  VCIX_XV,  uimm5, VR,    GPR>,   Sched<[]>;
@@ -201,7 +201,7 @@ let Predicates = [HasVendorXSfvcp], mayLoad = 0, mayStore = 0,
   defm FVW : CustomSiFiveVCIX<"fvw", VCIX_XVW, VR,    VR,    FPR32>, Sched<[]>;
 }
 
-let Predicates = [HasVendorXSfvqmaccdod], DecoderNamespace = "XSfvqmaccdod",
+let Predicates = [HasVendorXSfvqmaccdod], DecoderNamespace = "XSfvector",
     DestEEW = EEWSEWx4, RVVConstraint=VS2Constraint in {
   def VQMACCU_2x8x2  : CustomSiFiveVMACC<0b101100, OPMVV, "sf.vqmaccu.2x8x2">;
   def VQMACC_2x8x2   : CustomSiFiveVMACC<0b101101, OPMVV, "sf.vqmacc.2x8x2">;
@@ -209,7 +209,7 @@ let Predicates = [HasVendorXSfvqmaccdod], DecoderNamespace = "XSfvqmaccdod",
   def VQMACCSU_2x8x2 : CustomSiFiveVMACC<0b101111, OPMVV, "sf.vqmaccsu.2x8x2">;
 }
 
-let Predicates = [HasVendorXSfvqmaccqoq], DecoderNamespace = "XSfvqmaccqoq",
+let Predicates = [HasVendorXSfvqmaccqoq], DecoderNamespace = "XSfvector",
     DestEEW = EEWSEWx4, RVVConstraint=WidenV in {
   def VQMACCU_4x8x4  : CustomSiFiveVMACC<0b111100, OPMVV, "sf.vqmaccu.4x8x4">;
   def VQMACC_4x8x4   : CustomSiFiveVMACC<0b111101, OPMVV, "sf.vqmacc.4x8x4">;
@@ -217,12 +217,12 @@ let Predicates = [HasVendorXSfvqmaccqoq], DecoderNamespace = "XSfvqmaccqoq",
   def VQMACCSU_4x8x4 : CustomSiFiveVMACC<0b111111, OPMVV, "sf.vqmaccsu.4x8x4">;
 }
 
-let Predicates = [HasVendorXSfvfwmaccqqq], DecoderNamespace = "XSfvfwmaccqqq",
+let Predicates = [HasVendorXSfvfwmaccqqq], DecoderNamespace = "XSfvector",
     DestEEW = EEWSEWx2, RVVConstraint=WidenV in {
   def VFWMACC_4x4x4 : CustomSiFiveVMACC<0b111100, OPFVV, "sf.vfwmacc.4x4x4">;
 }
 
-let Predicates = [HasVendorXSfvfnrclipxfqf], DecoderNamespace = "XSfvfnrclipxfqf",
+let Predicates = [HasVendorXSfvfnrclipxfqf], DecoderNamespace = "XSfvector",
     Uses = [FRM] in {
   def VFNRCLIP_XU_F_QF : CustomSiFiveVFNRCLIP<0b100010, OPFVF, "sf.vfnrclip.xu.f.qf">;
   def VFNRCLIP_X_F_QF : CustomSiFiveVFNRCLIP<0b100011, OPFVF, "sf.vfnrclip.x.f.qf">;
@@ -836,7 +836,7 @@ let Predicates = [HasVendorXSfvfnrclipxfqf] in {
 
 let Predicates = [HasVendorXSiFivecdiscarddlone] in {
   let hasNoSchedulingInfo = 1, hasSideEffects = 1, mayLoad = 0, mayStore = 0,
-      DecoderNamespace = "XSiFivecdiscarddlone" in
+      DecoderNamespace = "XSfsystem" in
   def SF_CDISCARD_D_L1
       : RVInstIUnary<0b111111000010, 0b000, OPC_SYSTEM, (outs), (ins GPR:$rs1),
                      "sf.cdiscard.d.l1", "$rs1">, Sched<[]> {
@@ -847,7 +847,7 @@ let Predicates = [HasVendorXSiFivecdiscarddlone] in {
 
 let Predicates = [HasVendorXSiFivecflushdlone] in {
   let hasNoSchedulingInfo = 1, hasSideEffects = 1, mayLoad = 0, mayStore = 0,
-      DecoderNamespace = "XSiFivecflushdlone" in
+      DecoderNamespace = "XSfsystem" in
   def SF_CFLUSH_D_L1
       : RVInstIUnary<0b111111000000, 0b000, OPC_SYSTEM, (outs), (ins GPR:$rs1),
                      "sf.cflush.d.l1", "$rs1">, Sched<[]> {

``````````

</details>


https://github.com/llvm/llvm-project/pull/128794