Clarify ARM calling conventions.

llvm-svn: 151113
2012-02-22 01:07:19 +00:00 · 2012-02-22 01:07:19 +00:00 · 5f37f1c39d
parent 0178200062
commit 5f37f1c39d
1 changed files with 2 additions and 0 deletions
--- a/llvm/lib/Target/ARM/ARMBaseInstrInfo.cpp
+++ b/llvm/lib/Target/ARM/ARMBaseInstrInfo.cpp
@ -1401,6 +1401,8 @@ bool ARMBaseInstrInfo::isSchedulingBoundary(const MachineInstr *MI,
  // stack slot reference to depend on the instruction that does the
  // modification.
  // Calls don't actually change the stack pointer, even if they have imp-defs.
+  // No ARM calling conventions change the stack pointer. (X86 calling
+  // conventions sometimes do).
  if (!MI->isCall() && MI->definesRegister(ARM::SP))
    return true;