http://llvm.org/bugs/show_bug.cgi?id=8424
Summary: Stack probing code is only emitted on Cygwin/MinGW for
alloca. Windows needs it.
Product: libraries
Version: trunk
Platform: PC
OS/Version: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: Backend: X86
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
On Windows when growing the stack by more than 4096 bytes you must call
_chkstk(size) or _alloca_probe[_(8|16)](size) to correctly load these pages
into memory. This is currently handled in several different places, but the
place that ends up handling calls to alloca or allocation of variable length
arrays only works on Cygwin and MinGW.
It should be trivial to support this on native Windows, alloca on CygMing just
forwards to _chkstk.
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