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Provide dynamic_stackalloc lowering for MSP430.

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This fixes PR4769

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@80001 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Anton Korobeynikov 2009-08-25 17:00:23 +00:00
parent b157e70a68
commit 379a087cc7
3 changed files with 42 additions and 1 deletions
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2
lib/Target/MSP430/MSP430ISelLowering.cpp
View File

@ -95,6 +95,8 @@ MSP430TargetLowering::MSP430TargetLowering(MSP430TargetMachine &tm) :
setOperationAction(ISD::SELECT_CC, MVT::i8, Custom);
setOperationAction(ISD::SELECT_CC, MVT::i16, Custom);
setOperationAction(ISD::SIGN_EXTEND, MVT::i16, Custom);
setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i8, Expand);
setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i16, Expand);
setOperationAction(ISD::CTTZ, MVT::i8, Expand);
setOperationAction(ISD::CTTZ, MVT::i16, Expand);

11
lib/Target/MSP430/MSP430RegisterInfo.cpp
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@ -328,7 +328,16 @@ void MSP430RegisterInfo::emitEpilogue(MachineFunction &MF,
// mergeSPUpdatesUp(MBB, MBBI, StackPtr, &NumBytes);
if (MFI->hasVarSizedObjects()) {
llvm_unreachable("Not implemented yet!");
BuildMI(MBB, MBBI, DL,
TII.get(MSP430::MOV16rr), MSP430::SPW).addReg(MSP430::FPW);
if (CSSize) {
MachineInstr *MI =
BuildMI(MBB, MBBI, DL,
TII.get(MSP430::SUB16ri), MSP430::SPW)
.addReg(MSP430::SPW).addImm(CSSize);
// The SRW implicit def is dead.
MI->getOperand(3).setIsDead();
}
} else {
// adjust stack pointer back: SPW += numbytes
if (NumBytes) {

30
test/CodeGen/MSP430/2009-08-25-DynamicStackAlloc.ll Normal file
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@ -0,0 +1,30 @@
; RUN: llvm-as < %s | llc
; PR4769
target datalayout = "e-p:16:8:8-i8:8:8-i16:8:8-i32:8:8"
target triple = "msp430-generic-generic"
define i16 @foo() nounwind readnone {
entry:
%result = alloca i16, align 1 ; <i16*> [#uses=2]
volatile store i16 0, i16* %result
%tmp = volatile load i16* %result ; <i16> [#uses=1]
ret i16 %tmp
}
define i16 @main() nounwind {
entry:
br label %while.cond
while.cond: ; preds = %while.cond, %entry
%call = call i16 @bar() nounwind ; <i16> [#uses=1]
%tobool = icmp eq i16 %call, 0 ; <i1> [#uses=1]
br i1 %tobool, label %while.end, label %while.cond
while.end: ; preds = %while.cond
%result.i = alloca i16, align 1 ; <i16*> [#uses=2]
volatile store i16 0, i16* %result.i
%tmp.i = volatile load i16* %result.i ; <i16> [#uses=0]
ret i16 0
}
declare i16 @bar()