Vendor import of llvm RELEASE_360/rc1 tag r226102 (effectively, 3.6.0 RC1):vendor/llvm/llvm-release_360-r226102

https://llvm.org/svn/llvm-project/llvm/tags/RELEASE_360/rc1@226102

1 files changed, 30 insertions, 1 deletions

diff --git a/test/CodeGen/X86/empty-functions.ll b/test/CodeGen/X86/empty-functions.ll
index ac5174db5fc5..42349688a710 100644
--- a/test/CodeGen/X86/empty-functions.ll
+++ b/test/CodeGen/X86/empty-functions.ll
@@ -1,10 +1,14 @@
 ; 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
@@ -21,5 +25,30 @@ entry:
 ; CHECK-FP-NEXT: movq %rsp, %rbp
 ; CHECK-FP-NEXT: :
 ; CHECK-FP-NEXT: .cfi_def_cfa_register %rbp
-; CHECK-FP-NEXT: nop
 ; 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{{.*}}:{{$}}
+; LINUX-NO-FP-NEXT: .size   func, .L{{.*}}-func
+; LINUX-NO-FP-NEXT: .cfi_endproc
+
+; A cfi directive can point to the end of a function. It (and in fact the
+; entire body) could be optimized out because of the unreachable, but we
+; don't do it right now.
+; LINUX-FP: func:
+; LINUX-FP-NEXT: .cfi_startproc
+; LINUX-FP-NEXT: {{^}}#
+; LINUX-FP-NEXT: pushq %rbp
+; LINUX-FP-NEXT: {{^}}.L{{.*}}:{{$}}
+; LINUX-FP-NEXT:  .cfi_def_cfa_offset 16
+; LINUX-FP-NEXT: {{^}}.L{{.*}}:{{$}}
+; LINUX-FP-NEXT: .cfi_offset %rbp, -16
+; LINUX-FP-NEXT: movq        %rsp, %rbp
+; LINUX-FP-NEXT:{{^}}.L{{.*}}:{{$}}
+; LINUX-FP-NEXT: .cfi_def_cfa_register %rbp
+; LINUX-FP-NEXT:{{^}}.L{{.*}}:{{$}}
+; LINUX-FP-NEXT: .size   func, .Ltmp3-func
+; LINUX-FP-NEXT: .cfi_endproc