[LLVMbugs] [Bug 8777] New: [Win64] stack probe(alloca, chkstk) is not emitted with variable dynamic stack allocation
bugzilla-daemon at llvm.org
bugzilla-daemon at llvm.org
Sun Dec 12 23:33:26 PST 2010
http://llvm.org/bugs/show_bug.cgi?id=8777
Summary: [Win64] stack probe(alloca, chkstk) is not emitted
with variable dynamic stack allocation
Product: libraries
Version: trunk
Platform: PC
OS/Version: Windows XP
Status: NEW
Severity: normal
Priority: P
Component: Backend: X86
AssignedTo: unassignedbugs at nondot.org
ReportedBy: geek4civic at gmail.com
CC: llvmbugs at cs.uiuc.edu
define i64 @foo(i64 %n) nounwind {
entry:
%buf = alloca i8, i64 %n, align 1
%r = call i64 @bar(i8* %buf, i64 %n) nounwind
ret i64 %r
}
declare i64 @bar(i8* nocapture, i64) nounwind
$ llc -mtriple=x86_64-{win32|mingw32|mingw64}
foo:
pushq %rbp
movq %rsp, %rbp
subq $32, %rsp
movq %rcx, %rdx
leaq 15(%rdx), %rax
andq $-16, %rax
movq %rsp, %rcx
subq %rax, %rcx
movq %rcx, %rsp
callq bar
movq %rbp, %rsp
popq %rbp
ret
It seems alloca might be expanded w/o DYNAMIC_STACKALLOC after X86 DAG->DAG
Instruction Selection.
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