Imported Upstream version 5.18.0.246

Former-commit-id: 0c7ce5b1a7851e13f22acfd379b7f9fb304e4833

external/llvm/test/Transforms/DeadArgElim/naked_functions.ll

@@ -0,0 +1,31 @@
+; RUN: opt -S -deadargelim %s | FileCheck %s
+
+; Don't eliminate dead arugments from naked functions.
+; CHECK: define internal i32 @naked(i32 %x)
+
+define internal i32 @naked(i32 %x) #0 {
+  tail call void asm sideeffect inteldialect "mov eax, [esp + $$4]\0A\09ret", "~{eax},~{dirflag},~{fpsr},~{flags}"()
+  unreachable
+}
+
+
+; Don't eliminate dead varargs from naked functions.
+; CHECK: define internal i32 @naked_va(i32 %x, ...)
+
+define internal i32 @naked_va(i32 %x, ...) #0 {
+  tail call void asm sideeffect inteldialect "mov eax, [esp + $$8]\0A\09ret", "~{eax},~{dirflag},~{fpsr},~{flags}"()
+  unreachable
+}
+
+define i32 @f(i32 %x, i32 %y) {
+  %r = call i32 @naked(i32 %x)
+  %s = call i32 (i32, ...) @naked_va(i32 %x, i32 %r)
+
+; Make sure the arguments are still there: not removed or replaced with undef.
+; CHECK: %r = call i32 @naked(i32 %x)
+; CHECK: %s = call i32 (i32, ...) @naked_va(i32 %x, i32 %r)
+
+  ret i32 %s
+}
+
+attributes #0 = { naked }