http://llvm.org/bugs/show_bug.cgi?id=2921
Summary: alloca >4k stack probes on windows/visual studio
Product: libraries
Version: 2.3
Platform: PC
OS/Version: Windows XP
Status: NEW
Severity: normal
Priority: P2
Component: Backend: X86
AssignedTo: [EMAIL PROTECTED]
ReportedBy: [EMAIL PROTECTED]
CC: [email protected]
llvm already contains code to insert the required >4k stack probes aka
alloca_probe/chkstk on cygwin/mingw builds.
but if llvm is build with visual studio the insertion is omitted.
I've changed the test in lib/Target/X86/X86RegisterInfo.cpp:
if (NumBytes >= 4096 && Subtarget->isTargetCygMing()) {
to:
if (NumBytes >= 4096 && (Subtarget->isTargetCygMing() ||
Subtarget->isTargetWindows())) {
to avoid crashes for stack allocation bigger 4k.
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