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Avoid a Symbol -> Name -> Symbol conversion.

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Before this we were producing a TargetExternalSymbol from a MCSymbol.
That meant extracting the symbol name and fetching the symbol again
down the pipeline.

This patch adds a DAG.getMCSymbol that lets the MCSymbol pass unchanged on the
DAG.

Doing so removes the need for MO_NOPREFIX and fixes the root cause of pr23900,
allowing r240130 to be committed again.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@240300 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola
2015-06-22 17:46:53 +00:00
parent 2f801faafb
commit 09bbd16112
17 changed files with 103 additions and 46 deletions
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15
include/llvm/CodeGen/MachineOperand.h
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@ -450,11 +450,12 @@ public:
return Contents.CFIIndex;
}
/// getOffset - Return the offset from the symbol in this operand. This always
/// returns 0 for ExternalSymbol operands.
/// Return the offset from the symbol in this operand. This always returns 0
/// for ExternalSymbol operands.
int64_t getOffset() const {
assert((isGlobal() || isSymbol() || isCPI() || isTargetIndex() ||
isBlockAddress()) && "Wrong MachineOperand accessor");
assert((isGlobal() || isSymbol() || isMCSymbol() || isCPI() ||
isTargetIndex() || isBlockAddress()) &&
"Wrong MachineOperand accessor");
return int64_t(uint64_t(Contents.OffsetedInfo.OffsetHi) << 32) |
SmallContents.OffsetLo;
}
@ -512,8 +513,9 @@ public:
}
void setOffset(int64_t Offset) {
assert((isGlobal() || isSymbol() || isCPI() || isTargetIndex() ||
isBlockAddress()) && "Wrong MachineOperand accessor");
assert((isGlobal() || isSymbol() || isMCSymbol() || isCPI() ||
isTargetIndex() || isBlockAddress()) &&
"Wrong MachineOperand accessor");
SmallContents.OffsetLo = unsigned(Offset);
Contents.OffsetedInfo.OffsetHi = int(Offset >> 32);
}
@ -706,6 +708,7 @@ public:
static MachineOperand CreateMCSymbol(MCSymbol *Sym) {
MachineOperand Op(MachineOperand::MO_MCSymbol);
Op.Contents.Sym = Sym;
Op.setOffset(0);
return Op;
}