Imported Upstream version 5.18.0.205

Former-commit-id: 7f59f7e792705db773f1caecdaa823092f4e2927

external/llvm/test/Transforms/CalledValuePropagation/simple-select.ll

@@ -0,0 +1,39 @@
+; RUN: opt -called-value-propagation -S < %s | FileCheck %s
+
+target triple = "aarch64-unknown-linux-gnueabi"
+
+@global_function = internal unnamed_addr global void ()* null, align 8
+@global_scalar = internal unnamed_addr global i64 zeroinitializer
+
+; This test checks that we propagate the functions through a select
+; instruction, and attach !callees metadata to the call. Such metadata can
+; enable optimizations of this code sequence.
+;
+; For example, since both of the targeted functions have the "norecurse"
+; attribute, the function attributes pass can be made to infer that
+; "@test_select" is also norecurse. This would allow the globals optimizer to
+; localize "@global_scalar". The function could then be further simplified to
+; always return the constant "1", eliminating the load and store instructions.
+;
+; CHECK: call void %tmp0(), !callees ![[MD:[0-9]+]]
+; CHECK: ![[MD]] = !{void ()* @norecurse_1, void ()* @norecurse_2}
+;
+define i64 @test_select_entry(i1 %flag) {
+entry:
+  %tmp0 = call i64 @test_select(i1 %flag)
+  ret i64 %tmp0
+}
+
+define internal i64 @test_select(i1 %flag) {
+entry:
+  %tmp0 = select i1 %flag, void ()* @norecurse_1, void ()* @norecurse_2
+  store i64 1, i64* @global_scalar
+  call void %tmp0()
+  %tmp1 = load i64, i64* @global_scalar
+  ret i64 %tmp1
+}
+
+declare void @norecurse_1() #0
+declare void @norecurse_2() #0
+
+attributes #0 = { norecurse }