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MC/Expr: Add a doxyment.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121988 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Daniel Dunbar
2010-12-16 18:36:25 +00:00
parent 56b2eaf450
commit dd18e28c62
1 changed files with 14 additions and 0 deletions
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14
lib/MC/MCExpr.cpp
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@ -290,6 +290,20 @@ bool MCExpr::EvaluateAsAbsolute(int64_t &Res, const MCAssembler *Asm,
return true; return true;
} }
/// \brief Evaluate the result of an add between (conceptually) two MCValues.
///
/// This routine conceptually attempts to construct an MCValue:
/// Result = (Result_A - Result_B + Result_Cst)
/// from two MCValue's LHS and RHS where
/// Result = LHS + RHS
/// and
/// Result = (LHS_A - LHS_B + LHS_Cst) + (RHS_A - RHS_B + RHS_Cst).
///
/// This routine attempts to aggresively fold the operands such that the result
/// is representable in an MCValue, but may not always succeed.
///
/// \returns True on success, false if the result is not representable in an
/// MCValue.
static bool EvaluateSymbolicAdd(const MCAssembler *Asm, static bool EvaluateSymbolicAdd(const MCAssembler *Asm,
const MCAsmLayout *Layout, const MCAsmLayout *Layout,
const SectionAddrMap *Addrs, const SectionAddrMap *Addrs,