[llvm] [RISCV] Simplify MIPS CCMov patterns. NFC (PR #125318)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

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

Author: Craig Topper (topperc)

<details>
<summary>Changes</summary>

We have ComplexPatterns that reduce 3 patterns to 1, by handling the ==/!= 0, imm, and register cases. These are used for XTHeadCondMove, Zicond, XVentanaCondOps, and our basic seteq/setne patterns.

---
Full diff: https://github.com/llvm/llvm-project/pull/125318.diff


1 Files Affected:

- (modified) llvm/lib/Target/RISCV/RISCVInstrInfoXMips.td (+3-14) 


``````````diff
diff --git a/llvm/lib/Target/RISCV/RISCVInstrInfoXMips.td b/llvm/lib/Target/RISCV/RISCVInstrInfoXMips.td
index f53a887f62d464..9be424310d6600 100644
--- a/llvm/lib/Target/RISCV/RISCVInstrInfoXMips.td
+++ b/llvm/lib/Target/RISCV/RISCVInstrInfoXMips.td
@@ -116,24 +116,13 @@ def MIPS_CCMOV : RVInstR4<0b11, 0b011, OPC_CUSTOM_0, (outs GPR:$rd),
 }
 
 let Predicates = [UseCCMovInsn] in {
-def : Pat<(select (XLenVT (setne (XLenVT GPR:$rs2), (XLenVT 0))),
+def : Pat<(select (riscv_setne (XLenVT GPR:$rs2)),
                   (XLenVT GPR:$rs1), (XLenVT GPR:$rs3)),
           (MIPS_CCMOV GPR:$rs1, GPR:$rs2, GPR:$rs3)>;
-def : Pat<(select (XLenVT (setne (XLenVT GPR:$x), (XLenVT simm12_plus1:$y))),
-                  (XLenVT GPR:$rs1), (XLenVT GPR:$rs3)),
-          (MIPS_CCMOV GPR:$rs1, (ADDI GPR:$x, (NegImm simm12_plus1:$y)), GPR:$rs3)>;
-def : Pat<(select (XLenVT (setne (XLenVT GPR:$x), (XLenVT GPR:$y))),
-                  (XLenVT GPR:$rs1), (XLenVT GPR:$rs3)),
-          (MIPS_CCMOV GPR:$rs1, (XOR GPR:$x, GPR:$y), GPR:$rs3)>;
-def : Pat<(select (XLenVT (seteq (XLenVT GPR:$rs2), (XLenVT 0))),
+def : Pat<(select (riscv_seteq (XLenVT GPR:$rs2)),
                   (XLenVT GPR:$rs3), (XLenVT GPR:$rs1)),
           (MIPS_CCMOV GPR:$rs1, GPR:$rs2, GPR:$rs3)>;
-def : Pat<(select (XLenVT (seteq (XLenVT GPR:$x), (XLenVT simm12_plus1:$y))),
-                  (XLenVT GPR:$rs3), (XLenVT GPR:$rs1)),
-          (MIPS_CCMOV GPR:$rs1, (ADDI GPR:$x, (NegImm simm12_plus1:$y)), GPR:$rs3)>;
-def : Pat<(select (XLenVT (seteq (XLenVT GPR:$x), (XLenVT GPR:$y))),
-                  (XLenVT GPR:$rs3), (XLenVT GPR:$rs1)),
-          (MIPS_CCMOV GPR:$rs1, (XOR GPR:$x, GPR:$y), GPR:$rs3)>;
+
 def : Pat<(select (XLenVT GPR:$rs2), (XLenVT GPR:$rs1), (XLenVT GPR:$rs3)),
           (MIPS_CCMOV GPR:$rs1, GPR:$rs2, GPR:$rs3)>;
 }

``````````

</details>


https://github.com/llvm/llvm-project/pull/125318