Pre-commit test case for instruction cost of cmp instr (nfc)

Author: ElvisWang123

llvm/test/Analysis/CostModel/RISCV/cmp-select.ll

@@ -0,0 +1,13 @@
+; NOTE: Assertions have been autogenerated by utils/update_analyze_test_checks.py
+; RUN: opt < %s -mtriple=riscv64  -passes="print<cost-model>" -cost-kind=throughput 2>&1 -disable-output | FileCheck %s --check-prefixes=CHECK
+
+define void @cmp-select() {
+; CHECK-LABEL: 'cmp-select'
+; CHECK-NEXT:  Cost Model: Found an estimated cost of 1 for instruction: %cmp1 = icmp slt i64 0, 1
+; CHECK-NEXT:  Cost Model: Found an estimated cost of 1 for instruction: %select1 = select i1 %cmp1, i32 5, i32 4
+; CHECK-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: ret void
+;
+  %cmp1 = icmp slt i64 0, 1
+  %select1 = select i1 %cmp1, i32 5, i32 4
+  ret void
+}