[PATCH] D116607: [AIX][PowerPC][PGO] Generate .ref for some PGO sections

[wael yehia via Phabricator via llvm-commits]

w2yehia created this revision.
Herald added subscribers: wenlei, shchenz, kbarton, hiraditya, nemanjai.
w2yehia requested review of this revision.
Herald added a project: LLVM.
Herald added a subscriber: llvm-commits.

For PGO on AIX, when we switch to the linux-style PGO variable access (via _start and _stop labels), we need the compiler to generate a .ref assembly for each of the three csects:

  __llvm_prf_data[RW]
  __llvm_prf_names[RO]
  __llvm_prf_vnds[RW]

We insert the .ref inside the __llvm_prf_cnts[RW] csect so that if it's live then the 3 csects are live.

For example, for a testcase with at least one function definition, when compiled with -fprofile-generate we should generate:

  .csect __llvm_prf_cnts[RW],3
  .ref __llvm_prf_data[RW]   <<============ needs to be inserted
  .ref __llvm_prf_names[RO]  <<===========

the __llvm_prf_vnds is not always present, so we reference it only when it's present.


https://reviews.llvm.org/D116607

Files:
  llvm/include/llvm/MC/MCContext.h
  llvm/include/llvm/MC/MCStreamer.h
  llvm/include/llvm/MC/MCXCOFFStreamer.h
  llvm/lib/MC/MCAsmStreamer.cpp
  llvm/lib/MC/MCContext.cpp
  llvm/lib/MC/MCStreamer.cpp
  llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp
  llvm/test/CodeGen/PowerPC/pgo-ref-directive.ll

-------------- next part --------------
A non-text attachment was scrubbed...
Name: D116607.397338.patch
Type: text/x-patch
Size: 9834 bytes
Desc: not available
URL: <http://lists.llvm.org/pipermail/llvm-commits/attachments/20220104/322a810e/attachment.bin>