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Add a utility function to MachineInstr for testing whether an instruction

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has exactly one MachineMemOperand, and change some X86 lowering code to
make use of it.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53498 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2008-07-12 00:10:52 +00:00
parent e6acf36dca
commit cddc11e757
2 changed files with 10 additions and 7 deletions
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7
include/llvm/CodeGen/MachineInstr.h
View File

@ -115,6 +115,13 @@ public:
{ return MemOperands.end(); } { return MemOperands.end(); }
bool memoperands_empty() const { return MemOperands.empty(); } bool memoperands_empty() const { return MemOperands.empty(); }
/// hasOneMemOperand - Return true if this instruction has exactly one
/// MachineMemOperand.
bool hasOneMemOperand() const {
return !memoperands_empty() &&
next(memoperands_begin()) == memoperands_end();
}
/// isIdenticalTo - Return true if this instruction is identical to (same /// isIdenticalTo - Return true if this instruction is identical to (same
/// opcode and same operands as) the specified instruction. /// opcode and same operands as) the specified instruction.
bool isIdenticalTo(const MachineInstr *Other) const { bool isIdenticalTo(const MachineInstr *Other) const {

10
lib/Target/X86/X86InstrInfo.cpp
View File

@ -2030,14 +2030,10 @@ MachineInstr* X86InstrInfo::foldMemoryOperand(MachineFunction &MF,
// Check switch flag // Check switch flag
if (NoFusing) return NULL; if (NoFusing) return NULL;
// Determine the alignment of the load.
unsigned Alignment = 0; unsigned Alignment = 0;
for (alist<MachineMemOperand>::iterator i = LoadMI->memoperands_begin(), if (LoadMI->hasOneMemOperand())
e = LoadMI->memoperands_end(); i != e; ++i) { Alignment = LoadMI->memoperands_begin()->getAlignment();
const MachineMemOperand &MRO = *i;
unsigned Align = MRO.getAlignment();
if (Align > Alignment)
Alignment = Align;
}
// FIXME: Move alignment requirement into tables? // FIXME: Move alignment requirement into tables?
if (Alignment < 16) { if (Alignment < 16) {