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Generate code for LONG indexes to getelementptr instructions more efficiently

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@6828 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2003-06-21 16:01:24 +00:00
parent c901e8bd9e
commit f58544712b
2 changed files with 50 additions and 2 deletions
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26
lib/Target/X86/InstSelectSimple.cpp
View File

@ -1580,9 +1580,26 @@ void ISel::visitStoreInst(StoreInst &I) {
/// visitCastInst - Here we have various kinds of copying with or without
/// sign extension going on.
void ISel::visitCastInst(CastInst &CI) {
Value *Op = CI.getOperand(0);
// If this is a cast from a 32-bit integer to a Long type, and the only uses
// of the case are GEP instructions, then the cast does not need to be
// generated explicitly, it will be folded into the GEP.
if (CI.getType() == Type::LongTy &&
(Op->getType() == Type::IntTy || Op->getType() == Type::UIntTy)) {
bool AllUsesAreGEPs = true;
for (Value::use_iterator I = CI.use_begin(), E = CI.use_end(); I != E; ++I)
if (!isa<GetElementPtrInst>(*I)) {
AllUsesAreGEPs = false;
break;
}
// No need to codegen this cast if all users are getelementptr instrs...
if (AllUsesAreGEPs) return;
}
unsigned DestReg = getReg(CI);
MachineBasicBlock::iterator MI = BB->end();
emitCastOperation(BB, MI, CI.getOperand(0), CI.getType(), DestReg);
emitCastOperation(BB, MI, Op, CI.getType(), DestReg);
}
/// emitCastOperation - Common code shared between visitCastInst and
@ -1937,6 +1954,13 @@ void ISel::emitGEPOperation(MachineBasicBlock *MBB,
// time.
assert(idx->getType() == Type::LongTy && "Bad GEP array index!");
// Most GEP instructions use a [cast (int/uint) to LongTy] as their
// operand on X86. Handle this case directly now...
if (CastInst *CI = dyn_cast<CastInst>(idx))
if (CI->getOperand(0)->getType() == Type::IntTy ||
CI->getOperand(0)->getType() == Type::UIntTy)
idx = CI->getOperand(0);
// We want to add BaseReg to(idxReg * sizeof ElementType). First, we
// must find the size of the pointed-to type (Not coincidentally, the next
// type is the type of the elements in the array).

26
lib/Target/X86/X86ISelSimple.cpp
View File

@ -1580,9 +1580,26 @@ void ISel::visitStoreInst(StoreInst &I) {
/// visitCastInst - Here we have various kinds of copying with or without
/// sign extension going on.
void ISel::visitCastInst(CastInst &CI) {
Value *Op = CI.getOperand(0);
// If this is a cast from a 32-bit integer to a Long type, and the only uses
// of the case are GEP instructions, then the cast does not need to be
// generated explicitly, it will be folded into the GEP.
if (CI.getType() == Type::LongTy &&
(Op->getType() == Type::IntTy || Op->getType() == Type::UIntTy)) {
bool AllUsesAreGEPs = true;
for (Value::use_iterator I = CI.use_begin(), E = CI.use_end(); I != E; ++I)
if (!isa<GetElementPtrInst>(*I)) {
AllUsesAreGEPs = false;
break;
}
// No need to codegen this cast if all users are getelementptr instrs...
if (AllUsesAreGEPs) return;
}
unsigned DestReg = getReg(CI);
MachineBasicBlock::iterator MI = BB->end();
emitCastOperation(BB, MI, CI.getOperand(0), CI.getType(), DestReg);
emitCastOperation(BB, MI, Op, CI.getType(), DestReg);
}
/// emitCastOperation - Common code shared between visitCastInst and
@ -1937,6 +1954,13 @@ void ISel::emitGEPOperation(MachineBasicBlock *MBB,
// time.
assert(idx->getType() == Type::LongTy && "Bad GEP array index!");
// Most GEP instructions use a [cast (int/uint) to LongTy] as their
// operand on X86. Handle this case directly now...
if (CastInst *CI = dyn_cast<CastInst>(idx))
if (CI->getOperand(0)->getType() == Type::IntTy ||
CI->getOperand(0)->getType() == Type::UIntTy)
idx = CI->getOperand(0);
// We want to add BaseReg to(idxReg * sizeof ElementType). First, we
// must find the size of the pointed-to type (Not coincidentally, the next
// type is the type of the elements in the array).