Calls don't really change the stack pointer.

Even if a call instruction has %SP<imp-def> operands, it doesn't change
the value of the stack pointer.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@151104 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/ARM/ARMBaseInstrInfo.cpp b/lib/Target/ARM/ARMBaseInstrInfo.cpp
index 8f0170ce7893f44a2ca51beec38168a53b02ace6..88eb67f54fb8126553d95f003c1b7df422c74db7 100644 (file)
--- a/lib/Target/ARM/ARMBaseInstrInfo.cpp
+++ b/lib/Target/ARM/ARMBaseInstrInfo.cpp
@@ -1400,7 +1400,8 @@ bool ARMBaseInstrInfo::isSchedulingBoundary(const MachineInstr *MI,
   // saves compile time, because it doesn't require every single
   // stack slot reference to depend on the instruction that does the
   // modification.
-  if (MI->definesRegister(ARM::SP))
+  // Calls don't actually change the stack pointer, even if they have imp-defs.
+  if (!MI->isCall() && MI->definesRegister(ARM::SP))
     return true;
 
   return false;