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Implement dynamic allocas 

llvm-svn: 75985
This commit is contained in:
Anton Korobeynikov 2009-07-16 14:08:15 +00:00
parent 7193e2670e
commit a8197bb651
3 changed files with 22 additions and 1 deletions
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1
llvm/lib/Target/SystemZ/SystemZISelLowering.cpp
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@ -68,6 +68,7 @@ SystemZTargetLowering::SystemZTargetLowering(SystemZTargetMachine &tm) :
setOperationAction(ISD::BR_CC, MVT::i64, Custom);
setOperationAction(ISD::GlobalAddress, MVT::i64, Custom);
setOperationAction(ISD::JumpTable, MVT::i64, Custom);
setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i64, Expand);
// FIXME: Can we lower these 2 efficiently?
setOperationAction(ISD::SETCC, MVT::i32, Expand);

8
llvm/lib/Target/SystemZ/SystemZRegisterInfo.cpp
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@ -85,7 +85,13 @@ void SystemZRegisterInfo::
eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
MachineBasicBlock::iterator I) const {
if (!hasReservedCallFrame(MF)) {
assert(0 && "Not implemented yet!");
// If the stack pointer can be changed after prologue, turn the
// adjcallstackup instruction into a 'sub R15, <amt>' and the
// adjcallstackdown instruction into 'add R15, <amt>'
MachineInstr *Old = I;
uint64_t Amount = Old->getOperand(0).getImm();
assert((Amount == 0) && "Not implemented yet!");
}
MBB.erase(I);

14
llvm/test/CodeGen/SystemZ/09-DynamicAlloca.ll Normal file
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@ -0,0 +1,14 @@
; RUN: llvm-as < %s | llc
target datalayout = "E-p:64:64:64-i8:8:16-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-f128:128:128-a0:16:16"
target triple = "s390x-linux"
define void @foo(i64 %N) nounwind {
entry:
%N3 = trunc i64 %N to i32 ; <i32> [#uses=1]
%vla = alloca i8, i32 %N3, align 2 ; <i8*> [#uses=1]
call void @bar(i8* %vla) nounwind
ret void
}
declare void @bar(i8*)