Need to subtract, not add, stack size in SAVE instruction!
llvm-svn: 1005
diff --git a/llvm/lib/Target/Sparc/SparcInstrSelection.cpp b/llvm/lib/Target/Sparc/SparcInstrSelection.cpp
index dc8ab1b..4bcb9f5 100644
--- a/llvm/lib/Target/Sparc/SparcInstrSelection.cpp
+++ b/llvm/lib/Target/Sparc/SparcInstrSelection.cpp
@@ -1011,7 +1011,7 @@
mvec[0] = new MachineInstr(SAVE);
mvec[0]->SetMachineOperand(0, target.getRegInfo().getStackPointer());
mvec[0]->SetMachineOperand(1, MachineOperand::MO_SignExtendedImmed,
- staticStackSize);
+ - staticStackSize);
mvec[0]->SetMachineOperand(2, target.getRegInfo().getStackPointer());
return 1;
@@ -1519,8 +1519,11 @@
case 42: // bool: SetCC(reg, reg):
{
// If result of the SetCC is only used for a single branch, we can
- // discard the result. Otherwise, the boolean value must go into
- // an integer register.
+ // discard the boolean result and keep only the condition code.
+ // Otherwise, the boolean value must go into an integer register.
+ // To put the boolean result in a register we use a conditional move,
+ // unless the result of the SUBCC instruction can be used as the bool!
+ // This assumes that zero is FALSE and any non-zero integer is TRUE.
//
bool keepBoolVal = (subtreeRoot->parent() == NULL ||
((InstructionNode*) subtreeRoot->parent())