[MC] Suppress .Lcfi labels when emitting textual assembly

Summary:
This suppresses the generation of .Lcfi labels in our textual assembler.
It was annoying that this generated cascading .Lcfi labels:
  llc foo.ll -o - | llvm-mc | llvm-mc

After three trips through MCAsmStreamer, we'd have three labels in the
output when none are necessary. We should only bother creating the
labels and frame data when making a real object file.

This supercedes D38605, which moved the entire .seh_ implementation into
MCObjectStreamer.

This has the advantage that we do more checking when emitting textual
assembly, as a minor efficiency cost. Outputting textual assembly is not
performance critical, so this shouldn't matter.

Reviewers: majnemer, MatzeB

Subscribers: qcolombet, nemanjai, javed.absar, eraman, hiraditya, JDevlieghere, llvm-commits

Differential Revision: https://reviews.llvm.org/D38638

llvm-svn: 315259

1 files changed, 0 insertions, 4 deletions

diff --git a/llvm/test/CodeGen/X86/lea-opt-cse2.ll b/llvm/test/CodeGen/X86/lea-opt-cse2.ll
index 573b93dde43..865dd49a6e1 100644
--- a/llvm/test/CodeGen/X86/lea-opt-cse2.ll
+++ b/llvm/test/CodeGen/X86/lea-opt-cse2.ll
@@ -25,14 +25,10 @@ define void @foo(%struct.SA* nocapture %ctx, i32 %n) local_unnamed_addr #0 {
 ; X86-LABEL: foo:
 ; X86:       # BB#0: # %entry
 ; X86-NEXT:    pushl %edi
-; X86-NEXT:  .Lcfi0:
 ; X86-NEXT:    .cfi_def_cfa_offset 8
 ; X86-NEXT:    pushl %esi
-; X86-NEXT:  .Lcfi1:
 ; X86-NEXT:    .cfi_def_cfa_offset 12
-; X86-NEXT:  .Lcfi2:
 ; X86-NEXT:    .cfi_offset %esi, -12
-; X86-NEXT:  .Lcfi3:
 ; X86-NEXT:    .cfi_offset %edi, -8
 ; X86-NEXT:    movl {{[0-9]+}}(%esp), %ecx
 ; X86-NEXT:    movl {{[0-9]+}}(%esp), %eax