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Don't fold negative offsets into cp / dp accesses to avoid relocation errors.

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This can happen if the address + addend is less than the start of the cp / dp.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@143459 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Richard Osborne 2011-11-01 11:31:53 +00:00
parent 441ed4ac23
commit 0e6c1c536b
2 changed files with 27 additions and 2 deletions
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4
lib/Target/XCore/XCoreISelDAGToDAG.cpp
View File

@ -120,7 +120,7 @@ bool XCoreDAGToDAGISel::SelectADDRdpii(SDValue Addr, SDValue &Base,
ConstantSDNode *CN = 0;
if ((Addr.getOperand(0).getOpcode() == XCoreISD::DPRelativeWrapper)
&& (CN = dyn_cast<ConstantSDNode>(Addr.getOperand(1)))
&& (CN->getSExtValue() % 4 == 0)) {
&& (CN->getSExtValue() % 4 == 0 && CN->getSExtValue() >= 0)) {
// Constant word offset from a object in the data region
Base = Addr.getOperand(0).getOperand(0);
Offset = CurDAG->getTargetConstant(CN->getSExtValue(), MVT::i32);
@ -141,7 +141,7 @@ bool XCoreDAGToDAGISel::SelectADDRcpii(SDValue Addr, SDValue &Base,
ConstantSDNode *CN = 0;
if ((Addr.getOperand(0).getOpcode() == XCoreISD::CPRelativeWrapper)
&& (CN = dyn_cast<ConstantSDNode>(Addr.getOperand(1)))
&& (CN->getSExtValue() % 4 == 0)) {
&& (CN->getSExtValue() % 4 == 0 && CN->getSExtValue() >= 0)) {
// Constant word offset from a object in the data region
Base = Addr.getOperand(0).getOperand(0);
Offset = CurDAG->getTargetConstant(CN->getSExtValue(), MVT::i32);

25
test/CodeGen/XCore/global_negative_offset.ll Normal file
View File

@ -0,0 +1,25 @@
; RUN: llc < %s -march=xcore | FileCheck %s
; Don't fold negative offsets into cp / dp accesses to avoid a relocation
; error if the address + addend is less than the start of the cp / dp.
@a = external constant [0 x i32], section ".cp.rodata"
@b = external global [0 x i32]
define i32 *@f() nounwind {
entry:
; CHECK: f:
; CHECK: ldaw r11, cp[a]
; CHECK: sub r0, r11, 4
%0 = getelementptr [0 x i32]* @a, i32 0, i32 -1
ret i32* %0
}
define i32 *@g() nounwind {
entry:
; CHECK: g:
; CHECK: ldaw [[REG:r[0-9]+]], dp[b]
; CHECK: sub r0, [[REG]], 4
%0 = getelementptr [0 x i32]* @b, i32 0, i32 -1
ret i32* %0
}