[PATCH] D101004: [CodeGen] Do not split functions with attr "implicit-section-name".

[Snehasish Kumar via Phabricator via llvm-commits]

This revision was landed with ongoing or failed builds.
This revision was automatically updated to reflect the committed changes.
Closed by commit rG8077d0ff5c66: [CodeGen] Do not split functions with attr "implicit-section-name". (authored by snehasish).

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D101004/new/

https://reviews.llvm.org/D101004

Files:
  llvm/lib/CodeGen/MachineFunctionSplitter.cpp
  llvm/test/CodeGen/X86/machine-function-splitter.ll


Index: llvm/test/CodeGen/X86/machine-function-splitter.ll
===================================================================
--- llvm/test/CodeGen/X86/machine-function-splitter.ll
+++ llvm/test/CodeGen/X86/machine-function-splitter.ll
@@ -223,6 +223,26 @@
   ret i32 %5
 }
 
+define void @foo9(i1 zeroext %0) nounwind #0 !prof !14 {
+;; Check that function with section attribute is not split.
+; MFS-DEFAULTS-LABEL: foo9
+; MFS-DEFAULTS-NOT:   foo9.cold:
+  br i1 %0, label %2, label %4, !prof !17
+
+2:                                                ; preds = %1
+  %3 = call i32 @bar()
+  br label %6
+
+4:                                                ; preds = %1
+  %5 = call i32 @baz()
+  br label %6
+
+6:                                                ; preds = %4, %2
+  %7 = tail call i32 @qux()
+  ret void
+}
+
+
 declare i32 @bar()
 declare i32 @baz()
 declare i32 @bam()
@@ -232,6 +252,8 @@
 
 @_ZTIi = external constant i8*
 
+attributes #0 = { "implicit-section-name"="nosplit" }
+
 !llvm.module.flags = !{!0}
 !0 = !{i32 1, !"ProfileSummary", !1}
 !1 = !{!2, !3, !4, !5, !6, !7, !8, !9}
Index: llvm/lib/CodeGen/MachineFunctionSplitter.cpp
===================================================================
--- llvm/lib/CodeGen/MachineFunctionSplitter.cpp
+++ llvm/lib/CodeGen/MachineFunctionSplitter.cpp
@@ -101,7 +101,8 @@
   // since the split part may not be placed in a contiguous region. It may also
   // be more beneficial to augment the linker to ensure contiguous layout of
   // split functions within the same section as specified by the attribute.
-  if (!MF.getFunction().getSection().empty())
+  if (!MF.getFunction().getSection().empty() ||
+      MF.getFunction().hasFnAttribute("implicit-section-name"))
     return false;
 
   // We don't want to proceed further for cold functions


-------------- next part --------------
A non-text attachment was scrubbed...
Name: D101004.339468.patch
Type: text/x-patch
Size: 1821 bytes
Desc: not available
URL: <http://lists.llvm.org/pipermail/llvm-commits/attachments/20210422/0ea43510/attachment.bin>