Changes in directory llvm/lib/Target/X86:
X86ISelLowering.cpp updated: 1.392 -> 1.393
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Diffs of the changes: (+9 -0)
X86ISelLowering.cpp | 9 +++++++++
1 files changed, 9 insertions(+)
Index: llvm/lib/Target/X86/X86ISelLowering.cpp
diff -u llvm/lib/Target/X86/X86ISelLowering.cpp:1.392
llvm/lib/Target/X86/X86ISelLowering.cpp:1.393
--- llvm/lib/Target/X86/X86ISelLowering.cpp:1.392 Tue Apr 17 12:21:52 2007
+++ llvm/lib/Target/X86/X86ISelLowering.cpp Tue Apr 17 14:34:00 2007
@@ -3406,8 +3406,17 @@
}
}
+
+// Lower dynamic stack allocation to _alloca call for Cygwin/Mingw targets.
+// Calls to _alloca is needed to probe the stack when allocating more than 4k
+// bytes in one go. Touching the stack at 4K increments is necessary to ensure
+// that the guard pages used by the OS virtual memory manager are allocated in
+// correct sequence.
SDOperand X86TargetLowering::LowerDYNAMIC_STACKALLOC(SDOperand Op,
SelectionDAG &DAG) {
+ assert(Subtarget->isTargetCygMing() &&
+ "This should be used only on Cygwin/Mingw targets");
+
// Get the inputs.
SDOperand Chain = Op.getOperand(0);
SDOperand Size = Op.getOperand(1);
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