Imported Upstream version 5.18.0.246

Former-commit-id: 0c7ce5b1a7851e13f22acfd379b7f9fb304e4833

external/llvm/test/Transforms/InstCombine/store-load-unaliased-gep.ll

@@ -0,0 +1,23 @@
+; RUN: opt -instcombine %s -S 2>&1 | FileCheck %s
+; RUN: opt -aa-pipeline=basic-aa -passes=instcombine %s -S 2>&1 | FileCheck %s
+
+; Checking successful store-load optimization of array length.
+; Function below should deduce just to "return length".
+; Doable only if instcombine has access to alias-analysis.
+
+define i32 @test1(i32 %length) {
+; CHECK-LABEL: entry:
+entry:
+  %array = alloca i32, i32 2
+  ; CHECK-NOT: %array
+
+  %length_gep = getelementptr inbounds i32, i32 * %array, i32 0
+  %value_gep = getelementptr inbounds i32, i32 * %array, i32 1
+  store i32 %length, i32 * %length_gep
+  store i32 0, i32 * %value_gep
+  %loaded_length = load i32, i32 * %length_gep
+  ; CHECK-NOT: %loaded_length = load i32
+
+  ret i32 %loaded_length
+  ; CHECK: ret i32 %length
+}