[llvm] [TableGen][RISCV][GlobalISel] Select G_ICMP, G_SELECT, G_PTR_ADD (PR #67185)

[Craig Topper via llvm-commits]

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@@ -54,3 +71,56 @@ def : Pat<(i32 (srem GPR:$rs1, GPR:$rs2)), (REMW GPR:$rs1, GPR:$rs2)>;
 def : Pat<(i32 (udiv GPR:$rs1, GPR:$rs2)), (DIVUW GPR:$rs1, GPR:$rs2)>;
 def : Pat<(i32 (urem GPR:$rs1, GPR:$rs2)), (REMUW GPR:$rs1, GPR:$rs2)>;
 }
+
+// Ptr type used in patterns with GlobalISelEmitter
+def PtrVT : PtrValueTypeByHwMode<XLenVT, 0>;
+
+// Define pattern expansions for pointer ult/slt conditional codes
+def : Pat<(XLenVT (setult (PtrVT GPR:$rs1), simm12:$imm12)),
+          (SLTIU GPR:$rs1, simm12:$imm12)>;
+def : Pat<(XLenVT (setult (PtrVT GPR:$rs1), (PtrVT GPR:$rs2))),
+          (SLTU GPR:$rs1, GPR:$rs2)>;
+def : Pat<(XLenVT (setlt (PtrVT GPR:$rs1), simm12:$imm12)),
+          (SLTI GPR:$rs1, simm12:$imm12)>;
+def : Pat<(XLenVT (setlt (PtrVT GPR:$rs1), (PtrVT GPR:$rs2))),
+          (SLT GPR:$rs1, GPR:$rs2)>;
+
+// Define pattern expansions for setcc operations that aren't directly
+// handled by a RISC-V instruction.
+foreach Ty = [PtrVT, XLenVT] in {
+def : Pat<(XLenVT (seteq (Ty GPR:$rs1), 0)), (SLTIU GPR:$rs1, 1)>;
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topperc wrote:

Does this pattern work for pointers if you don't put `(Ty 0)`?

https://github.com/llvm/llvm-project/pull/67185