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6797305: Add LoadUB and LoadUI opcode class

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Add a LoadUB (unsigned byte) and LoadUI (unsigned int) opcode class so we have these load optimizations in the first place and do not need to handle them in the matcher.

Reviewed-by: never, kvn
This commit is contained in:
Christian Thalinger 2009-03-09 03:17:11 -07:00
parent 26d192003f
commit 89cea91c48
17 changed files with 726 additions and 186 deletions
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20
hotspot/src/share/vm/opto/memnode.cpp
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@ -1,5 +1,5 @@
/*
* Copyright 1997-2008 Sun Microsystems, Inc. All Rights Reserved.
* Copyright 1997-2009 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -778,7 +778,7 @@ Node *LoadNode::make( PhaseGVN& gvn, Node *ctl, Node *mem, Node *adr, const Type
adr_type->offset() == arrayOopDesc::length_offset_in_bytes()),
"use LoadRangeNode instead");
switch (bt) {
case T_BOOLEAN:
case T_BOOLEAN: return new (C, 3) LoadUBNode(ctl, mem, adr, adr_type, rt->is_int() );
case T_BYTE: return new (C, 3) LoadBNode (ctl, mem, adr, adr_type, rt->is_int() );
case T_INT: return new (C, 3) LoadINode (ctl, mem, adr, adr_type, rt->is_int() );
case T_CHAR: return new (C, 3) LoadUSNode(ctl, mem, adr, adr_type, rt->is_int() );
@ -1616,6 +1616,22 @@ Node *LoadBNode::Ideal(PhaseGVN *phase, bool can_reshape) {
return LoadNode::Ideal(phase, can_reshape);
}
//--------------------------LoadUBNode::Ideal-------------------------------------
//
// If the previous store is to the same address as this load,
// and the value stored was larger than a byte, replace this load
// with the value stored truncated to a byte. If no truncation is
// needed, the replacement is done in LoadNode::Identity().
//
Node* LoadUBNode::Ideal(PhaseGVN* phase, bool can_reshape) {
Node* mem = in(MemNode::Memory);
Node* value = can_see_stored_value(mem, phase);
if (value && !phase->type(value)->higher_equal(_type))
return new (phase->C, 3) AndINode(value, phase->intcon(0xFF));
// Identity call will handle the case where truncation is not needed.
return LoadNode::Ideal(phase, can_reshape);
}
//--------------------------LoadUSNode::Ideal-------------------------------------
//
// If the previous store is to the same address as this load,