Imported Upstream version 6.10.0.49

Former-commit-id: 1d6753294b2993e1fbf92de9366bb9544db4189b

external/llvm-project/llvm/test/CodeGen/X86/empty-functions.ll

@@ -0,0 +1,44 @@
+; RUN: llc < %s -mtriple=x86_64-apple-darwin | FileCheck -check-prefix=CHECK-NO-FP %s
+; RUN: llc < %s -mtriple=x86_64-apple-darwin -disable-fp-elim | FileCheck -check-prefix=CHECK-FP %s
+; RUN: llc < %s -mtriple=x86_64-linux-gnu | FileCheck -check-prefix=LINUX-NO-FP %s
+; RUN: llc < %s -mtriple=x86_64-linux-gnu -disable-fp-elim | FileCheck -check-prefix=LINUX-FP %s
+
+define void @func() {
+entry:
+  unreachable
+}
+
+; MachO cannot handle an empty function.
+; CHECK-NO-FP:     _func:
+; CHECK-NO-FP-NEXT: .cfi_startproc
+; CHECK-NO-FP:     nop
+; CHECK-NO-FP-NEXT: .cfi_endproc
+
+; CHECK-FP:      _func:
+; CHECK-FP-NEXT: .cfi_startproc
+; CHECK-FP-NEXT: :
+; CHECK-FP-NEXT: pushq %rbp
+; CHECK-FP-NEXT: .cfi_def_cfa_offset 16
+; CHECK-FP-NEXT: .cfi_offset %rbp, -16
+; CHECK-FP-NEXT: movq %rsp, %rbp
+; CHECK-FP-NEXT: .cfi_endproc
+
+; An empty function is perfectly fine on ELF.
+; LINUX-NO-FP: func:
+; LINUX-NO-FP-NEXT: .cfi_startproc
+; LINUX-NO-FP-NEXT: {{^}}#
+; LINUX-NO-FP-NEXT: {{^}}.L{{.*}}:{{$}}
+; LINUX-NO-FP-NEXT: .size   func, .L{{.*}}-func
+; LINUX-NO-FP-NEXT: .cfi_endproc
+
+; A cfi directive cannot point to the end of a function.
+; LINUX-FP: func:
+; LINUX-FP-NEXT: .cfi_startproc
+; LINUX-FP-NEXT: {{^}}#
+; LINUX-FP-NEXT: pushq %rbp
+; LINUX-FP-NEXT:  .cfi_def_cfa_offset 16
+; LINUX-FP-NEXT: .cfi_offset %rbp, -16
+; LINUX-FP-NEXT: movq        %rsp, %rbp
+; LINUX-FP-NEXT:{{^}}.L{{.*}}:{{$}}
+; LINUX-FP-NEXT: .size   func, .Lfunc_end0-func
+; LINUX-FP-NEXT: .cfi_endproc