[llvm] [GlobalISel] Take the result size into account when const folding icmp (PR #134365)

[Matt Arsenault via llvm-commits]

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@@ -500,6 +500,18 @@ TEST_F(AArch64GISelMITest, TestConstantFoldICMP) {
     EXPECT_TRUE(I->getOperand(1).getCImm()->getZExtValue());
   }
 
+  {
+    auto I = CSEB.buildICmp(CmpInst::Predicate::ICMP_EQ, s32, One, One);
+    EXPECT_TRUE(I->getOpcode() == TargetOpcode::G_CONSTANT);
+    EXPECT_EQ(I->getOperand(1).getCImm()->getZExtValue(), 1);
+  }
+
+  {
+    auto I = CSEB.buildICmp(CmpInst::Predicate::ICMP_EQ, s32, One, Two);
+    EXPECT_TRUE(I->getOpcode() == TargetOpcode::G_CONSTANT);
+    EXPECT_EQ(I->getOperand(1).getCImm()->getZExtValue(), 0);
+  }
+
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arsenm wrote:

Check a vector case? 

https://github.com/llvm/llvm-project/pull/134365