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Don't fold address calculations which use negative offsets into

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the ADDRspii addressing mode.

llvm-svn: 62258
This commit is contained in:
Richard Osborne 2009-01-15 11:32:30 +00:00
parent 71ffa94e3f
commit ce265d8cf9
2 changed files with 14 additions and 2 deletions
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4
lib/Target/XCore/XCoreISelDAGToDAG.cpp
View File

@ -92,8 +92,8 @@ bool XCoreDAGToDAGISel::SelectADDRspii(SDValue Op, SDValue Addr,
ConstantSDNode *CN = 0;
if ((FIN = dyn_cast<FrameIndexSDNode>(Addr.getOperand(0)))
&& (CN = dyn_cast<ConstantSDNode>(Addr.getOperand(1)))
&& (CN->getSExtValue() % 4 == 0)) {
// Constant word offset from frame pointer
&& (CN->getSExtValue() % 4 == 0 && CN->getSExtValue() >= 0)) {
// Constant positive word offset from frame index
Base = CurDAG->getTargetFrameIndex(FIN->getIndex(), MVT::i32);
Offset = CurDAG->getTargetConstant(CN->getSExtValue(), MVT::i32);
return true;

12
test/CodeGen/XCore/2009-01-08-Crash.ll Normal file
View File

@ -0,0 +1,12 @@
; RUN: llvm-as < %s | llc -march=xcore > %t1.s
;; This caused a compilation failure since the
;; address arithmetic was folded into the LDWSP instruction,
;; resulting in a negative offset which eliminateFrameIndex was
;; unable to eliminate.
define i32 @test(i32 %bar) nounwind readnone {
entry:
%bar_addr = alloca i32
%0 = getelementptr i32* %bar_addr, i32 -1
%1 = load i32* %0, align 4
ret i32 %1
}