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Replace M_REMATERIALIZIBLE and the newly-added isOtherReMaterializableLoad

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with a general target hook to identify rematerializable instructions. Some
instructions are only rematerializable with specific operands, such as loads
from constant pools, while others are always rematerializable. This hook
allows both to be identified as being rematerializable with the same
mechanism.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37644 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2007-06-19 01:48:05 +00:00
parent eaa91b0a1f
commit 82a87a0172
17 changed files with 48 additions and 48 deletions
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9
lib/CodeGen/LiveIntervalAnalysis.cpp
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@ -336,14 +336,13 @@ void LiveIntervals::handleVirtualRegisterDef(MachineBasicBlock *mbb,
// time we see a vreg.
if (interval.empty()) {
// Remember if the definition can be rematerialized. All load's from fixed
// stack slots are re-materializable. The target may permit other loads to
// be re-materialized as well.
// stack slots are re-materializable. The target may permit other
// instructions to be re-materialized as well.
int FrameIdx = 0;
if (vi.DefInst &&
(tii_->isReMaterializable(vi.DefInst->getOpcode()) ||
(tii_->isTriviallyReMaterializable(vi.DefInst) ||
(tii_->isLoadFromStackSlot(vi.DefInst, FrameIdx) &&
mf_->getFrameInfo()->isFixedObjectIndex(FrameIdx)) ||
tii_->isOtherReMaterializableLoad(vi.DefInst)))
mf_->getFrameInfo()->isFixedObjectIndex(FrameIdx))))
interval.remat = vi.DefInst;
// Get the Idx of the defining instructions.