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Improve MachineMemOperand handling.

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- Allocate MachineMemOperands and MachineMemOperand lists in MachineFunctions.
   This eliminates MachineInstr's std::list member and allows the data to be
   created by isel and live for the remainder of codegen, avoiding a lot of
   copying and unnecessary translation. This also shrinks MemSDNode.
 - Delete MemOperandSDNode. Introduce MachineSDNode which has dedicated
   fields for MachineMemOperands.
 - Change MemSDNode to have a MachineMemOperand member instead of its own
   fields with the same information. This introduces some redundancy, but
   it's more consistent with what MachineInstr will eventually want.
 - Ignore alignment when searching for redundant loads for CSE, but remember
   the greatest alignment.

Target-specific code which previously used MemOperandSDNodes with generic
SDNodes now use MemIntrinsicSDNodes, with opcodes in a designated range
so that the SelectionDAG framework knows that MachineMemOperand information
is available.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82794 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2009-09-25 20:36:54 +00:00
parent 602b0c8c17
commit c76909abfe
30 changed files with 744 additions and 544 deletions
Download Patch File Download Diff File Expand all files Collapse all files
lib/CodeGen/LiveIntervalAnalysis.cpp
+6 -5
View File
@@ -25,6 +25,7 @@
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineLoopInfo.h"
#include "llvm/CodeGen/MachineMemOperand.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/Passes.h"
#include "llvm/CodeGen/PseudoSourceValue.h"
@@ -1443,12 +1444,12 @@ bool LiveIntervals::isReMaterializable(const LiveInterval &li,
// If the instruction accesses memory and the memory could be non-constant,
// assume the instruction is not rematerializable.
for (std::list<MachineMemOperand>::const_iterator
I = MI->memoperands_begin(), E = MI->memoperands_end(); I != E; ++I){
const MachineMemOperand &MMO = *I;
if (MMO.isVolatile() || MMO.isStore())
for (MachineInstr::mmo_iterator I = MI->memoperands_begin(),
E = MI->memoperands_end(); I != E; ++I){
const MachineMemOperand *MMO = *I;
if (MMO->isVolatile() || MMO->isStore())
return false;
const Value *V = MMO.getValue();
const Value *V = MMO->getValue();
if (!V)
return false;
if (const PseudoSourceValue *PSV = dyn_cast<PseudoSourceValue>(V)) {