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Add an explanation on how mips is special in here.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@273868 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola 2016-06-27 12:33:33 +00:00
parent 8430ca2f8f
commit 706f4ac5f6
1 changed files with 11 additions and 0 deletions
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11
lib/Target/Mips/MipsISelLowering.cpp
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@ -1764,6 +1764,17 @@ SDValue MipsTargetLowering::lowerGlobalAddress(SDValue Op,
return getAddrNonPIC(N, SDLoc(N), Ty, DAG); return getAddrNonPIC(N, SDLoc(N), Ty, DAG);
} }
// Every other architecture would use shouldAssumeDSOLocal in here, but
// mips is special.
// * In PIC code mips requires got loads oven for local statics!
// * To save on got entries, for local statics the got entry contains the
// page and an additional add instruction takes care of the low bits.
// * It is legal to access a hidden symbol with a non hidden undefined,
// so one cannot guarantee that all access to a hidden symbol will know
// it is hidden.
// * Mips linkers don't support creating a page and a full got entry for
// the same symbol.
// * Given all that, we have to use a full got entry for hidden symbols :-(
if (GV->hasLocalLinkage()) if (GV->hasLocalLinkage())
return getAddrLocal(N, SDLoc(N), Ty, DAG, ABI.IsN32() || ABI.IsN64()); return getAddrLocal(N, SDLoc(N), Ty, DAG, ABI.IsN32() || ABI.IsN64());