[llvm] [RISCV] Remove unneeded unmasked patterns for vcpop_v and riscv_vfirst_vl. (PR #127435)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

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

Author: Craig Topper (topperc)

<details>
<summary>Changes</summary>

The pseudos have RISCVMaskedPseudo so I think we are able to convert the masked for to unmasked for automatically.

---
Full diff: https://github.com/llvm/llvm-project/pull/127435.diff


1 Files Affected:

- (modified) llvm/lib/Target/RISCV/RISCVInstrInfoVVLPatterns.td (-8) 


``````````diff
diff --git a/llvm/lib/Target/RISCV/RISCVInstrInfoVVLPatterns.td b/llvm/lib/Target/RISCV/RISCVInstrInfoVVLPatterns.td
index c914dc2ffbcd3..ffa3d3982647d 100644
--- a/llvm/lib/Target/RISCV/RISCVInstrInfoVVLPatterns.td
+++ b/llvm/lib/Target/RISCV/RISCVInstrInfoVVLPatterns.td
@@ -2701,20 +2701,12 @@ foreach mti = AllMasks in {
                    VR:$rs, VR:$rs, GPR:$vl, mti.Log2SEW)>;
 
     // 15.2 Vector count population in mask vcpop.m
-    def : Pat<(XLenVT (riscv_vcpop_vl (mti.Mask VR:$rs2), (mti.Mask true_mask),
-                                      VLOpFrag)),
-              (!cast<Instruction>("PseudoVCPOP_M_" # mti.BX)
-                   VR:$rs2, GPR:$vl, mti.Log2SEW)>;
     def : Pat<(XLenVT (riscv_vcpop_vl (mti.Mask VR:$rs2), (mti.Mask VMV0:$vm),
                                       VLOpFrag)),
               (!cast<Instruction>("PseudoVCPOP_M_" # mti.BX # "_MASK")
                    VR:$rs2, (mti.Mask VMV0:$vm), GPR:$vl, mti.Log2SEW)>;
 
     // 15.3 vfirst find-first-set mask bit
-    def : Pat<(XLenVT (riscv_vfirst_vl (mti.Mask VR:$rs2), (mti.Mask true_mask),
-                                      VLOpFrag)),
-              (!cast<Instruction>("PseudoVFIRST_M_" # mti.BX)
-                   VR:$rs2, GPR:$vl, mti.Log2SEW)>;
     def : Pat<(XLenVT (riscv_vfirst_vl (mti.Mask VR:$rs2), (mti.Mask VMV0:$vm),
                                       VLOpFrag)),
               (!cast<Instruction>("PseudoVFIRST_M_" # mti.BX # "_MASK")

``````````

</details>


https://github.com/llvm/llvm-project/pull/127435