[X86] Introduce test for PR112098 (NFC)

Author: antoniofrighetto

llvm/test/CodeGen/X86/tailcall-caller-nocsr.ll

@@ -0,0 +1,32 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
+; RUN: llc < %s -mtriple=x86_64-linux-gnu -mattr=-sse,-avx | FileCheck %s
+
+@.str = private unnamed_addr constant [6 x i8] c"%d %d\00", align 1
+
+define void @caller(i32 %0, i32 %1) #0 {
+; CHECK-LABEL: caller:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    pushq %r11
+; CHECK-NEXT:    pushq %r10
+; CHECK-NEXT:    pushq %r9
+; CHECK-NEXT:    pushq %r8
+; CHECK-NEXT:    pushq %rdx
+; CHECK-NEXT:    pushq %rcx
+; CHECK-NEXT:    pushq %rax
+; CHECK-NEXT:    movl %edi, %esi
+; CHECK-NEXT:    movl $.L.str, %edi
+; CHECK-NEXT:    popq %rax
+; CHECK-NEXT:    popq %rcx
+; CHECK-NEXT:    popq %rdx
+; CHECK-NEXT:    popq %r8
+; CHECK-NEXT:    popq %r9
+; CHECK-NEXT:    popq %r10
+; CHECK-NEXT:    popq %r11
+; CHECK-NEXT:    jmp printf@PLT # TAILCALL
+  %3 = tail call i32 @printf(ptr @.str, i32 %0, i32 %1)
+  ret void
+}
+
+declare i32 @printf(ptr, ...) nounwind
+
+attributes #0 = { mustprogress nounwind "no_caller_saved_registers" }