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Shrink MachineMemOperand by storing the alignment in log form

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and rearranging the fields.

llvm-svn: 53195
This commit is contained in:
Dan Gohman 2008-07-07 20:05:04 +00:00
parent 713d153ea3
commit f2b95cb24f
1 changed files with 7 additions and 6 deletions
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13
include/llvm/CodeGen/MachineMemOperand.h
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@ -16,6 +16,8 @@
#ifndef LLVM_CODEGEN_MEMOPERAND_H
#define LLVM_CODEGEN_MEMOPERAND_H
#include "llvm/Support/MathExtras.h"
namespace llvm {
class Value;
@ -29,11 +31,10 @@ class Value;
/// that aren't explicit in the regular LLVM IR.
///
class MachineMemOperand {
const Value *V;
unsigned int Flags;
int64_t Offset;
uint64_t Size;
unsigned int Alignment;
const Value *V;
unsigned int Flags;
public:
/// Flags values. These may be or'd together.
@ -50,7 +51,7 @@ public:
/// specified address Value, flags, offset, size, and alignment.
MachineMemOperand(const Value *v, unsigned int f, int64_t o, uint64_t s,
unsigned int a)
: V(v), Flags(f), Offset(o), Size(s), Alignment(a) {}
: Offset(o), Size(s), V(v), Flags((f & 7) | ((Log2_32(a) + 1) << 3)) {}
/// getValue - Return the base address of the memory access.
/// Special values are PseudoSourceValue::FPRel, PseudoSourceValue::SPRel,
@ -59,7 +60,7 @@ public:
const Value *getValue() const { return V; }
/// getFlags - Return the raw flags of the source value, \see MemOperandFlags.
unsigned int getFlags() const { return Flags; }
unsigned int getFlags() const { return Flags & 7; }
/// getOffset - For normal values, this is a byte offset added to the base
/// address. For PseudoSourceValue::FPRel values, this is the FrameIndex
@ -71,7 +72,7 @@ public:
/// getAlignment - Return the minimum known alignment in bytes of the
/// memory reference.
unsigned int getAlignment() const { return Alignment; }
unsigned int getAlignment() const { return (1u << (Flags >> 3)) >> 1; }
bool isLoad() const { return Flags & MOLoad; }
bool isStore() const { return Flags & MOStore; }