mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-19 19:29:31 +00:00
Avoid making unneeded load/mod/store transformation which can hurt performance.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@29952 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
parent
1efba0ecb4
commit
82a35b34fb
@ -80,6 +80,9 @@ namespace {
|
||||
Statistic<>
|
||||
NumFPKill("x86-codegen", "Number of FP_REG_KILL instructions added");
|
||||
|
||||
Statistic<>
|
||||
NumLoadMoved("x86-codegen", "Number of loads moved below TokenFactor");
|
||||
|
||||
//===--------------------------------------------------------------------===//
|
||||
/// ISel - X86 specific code to select X86 machine instructions for
|
||||
/// SelectionDAG operations.
|
||||
@ -313,8 +316,6 @@ void X86DAGToDAGISel::InstructionSelectPreprocess(SelectionDAG &DAG) {
|
||||
switch (Opcode) {
|
||||
case ISD::ADD:
|
||||
case ISD::MUL:
|
||||
case ISD::FADD:
|
||||
case ISD::FMUL:
|
||||
case ISD::AND:
|
||||
case ISD::OR:
|
||||
case ISD::XOR:
|
||||
@ -329,7 +330,8 @@ void X86DAGToDAGISel::InstructionSelectPreprocess(SelectionDAG &DAG) {
|
||||
std::swap(N10, N11);
|
||||
}
|
||||
RModW = RModW && N10.Val->isOperand(Chain.Val) && N10.hasOneUse() &&
|
||||
N10.getOperand(1) == N2;
|
||||
(N10.getOperand(1) == N2) &&
|
||||
(N10.Val->getValueType(0) == N1.getValueType());
|
||||
if (RModW)
|
||||
Load = N10;
|
||||
break;
|
||||
@ -347,15 +349,18 @@ void X86DAGToDAGISel::InstructionSelectPreprocess(SelectionDAG &DAG) {
|
||||
SDOperand N10 = N1.getOperand(0);
|
||||
if (N10.Val->getOpcode() == ISD::LOAD)
|
||||
RModW = N10.Val->isOperand(Chain.Val) && N10.hasOneUse() &&
|
||||
N10.getOperand(1) == N2;
|
||||
(N10.getOperand(1) == N2) &&
|
||||
(N10.Val->getValueType(0) == N1.getValueType());
|
||||
if (RModW)
|
||||
Load = N10;
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
if (RModW)
|
||||
if (RModW) {
|
||||
MoveBelowTokenFactor(DAG, Load, SDOperand(I, 0), Chain);
|
||||
++NumLoadMoved;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
Loading…
Reference in New Issue
Block a user