[llvm] [SandboxIR] Implement CmpInst, FCmpInst, and ICmpInst (PR #106301)

[via llvm-commits]

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@@ -4392,6 +4392,159 @@ define void @foo(i32 %arg) {
   EXPECT_EQ(NewPHI->getNumIncomingValues(), PHI->getNumIncomingValues());
 }
 
+static void checkSwapOperands(sandboxir::Context &Ctx,
+                              llvm::sandboxir::CmpInst *Cmp,
+                              llvm::CmpInst *LLVMCmp) {
+  auto OrigOp0 = Cmp->getOperand(0);
+  auto OrigOp1 = Cmp->getOperand(1);
+  EXPECT_EQ(Ctx.getValue(LLVMCmp->getOperand(0)), OrigOp0);
+  EXPECT_EQ(Ctx.getValue(LLVMCmp->getOperand(1)), OrigOp1);
+  // This checks the dispatch mechanism in CmpInst, as well as
+  // the specific implementations.
+  Cmp->swapOperands();
+  EXPECT_EQ(Ctx.getValue(LLVMCmp->getOperand(1)), OrigOp0);
+  EXPECT_EQ(Ctx.getValue(LLVMCmp->getOperand(0)), OrigOp1);
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Sterling-Augustine wrote:

err, these are the only calls to swap operands. And to ensure that the operands were swapped we need to be sure that the inverse predicate is chosen, as well as switching the operands themselves.

https://github.com/llvm/llvm-project/pull/106301