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Add a FIXME about access to negative stack-pointer offsets on PPC32.

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The current code will generate a prologue which starts with something like:
        mflr 0
        stw 31, -4(1)
        stw 0, 4(1)
        stwu 1, -16(1)

But under the PPC32 SVR4 ABI, access to negative offsets from R1 is not allowed.

This was pointed out by Peter Bergner.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@157133 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Hal Finkel 2012-05-19 21:52:55 +00:00
parent ec096b4925
commit b8f2f29467
1 changed files with 2 additions and 0 deletions
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2
lib/Target/PowerPC/PPCFrameLowering.cpp
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@ -330,6 +330,8 @@ void PPCFrameLowering::emitPrologue(MachineFunction &MF) const {
BuildMI(MBB, MBBI, dl, TII.get(PPC::MFLR), PPC::R0);
if (HasFP)
// FIXME: On PPC32 SVR4, FPOffset is negative and access to negative
// offsets of R1 is not allowed.
BuildMI(MBB, MBBI, dl, TII.get(PPC::STW))
.addReg(PPC::R31)
.addImm(FPOffset)