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Infrastructure for getting the machine code size of a function and an instruction. X86, PowerPC and ARM are implemented

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49809 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nicolas Geoffray
2008-04-16 20:10:13 +00:00
parent dc00858e11
commit 52e724ad7e
14 changed files with 636 additions and 208 deletions
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lib/Target/PowerPC/PPCBranchSelector.cpp
+2 -22
View File
@@ -22,7 +22,6 @@
#include "PPCPredicates.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetAsmInfo.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/MathExtras.h"
@@ -54,25 +53,6 @@ FunctionPass *llvm::createPPCBranchSelectionPass() {
return new PPCBSel();
}
/// getNumBytesForInstruction - Return the number of bytes of code the specified
/// instruction may be. This returns the maximum number of bytes.
///
static unsigned getNumBytesForInstruction(MachineInstr *MI) {
switch (MI->getOpcode()) {
case PPC::INLINEASM: { // Inline Asm: Variable size.
MachineFunction *MF = MI->getParent()->getParent();
const char *AsmStr = MI->getOperand(0).getSymbolName();
return MF->getTarget().getTargetAsmInfo()->getInlineAsmLength(AsmStr);
}
case PPC::LABEL: {
return 0;
}
default:
return 4; // PowerPC instructions are all 4 bytes
}
}
bool PPCBSel::runOnMachineFunction(MachineFunction &Fn) {
const TargetInstrInfo *TII = Fn.getTarget().getInstrInfo();
// Give the blocks of the function a dense, in-order, numbering.
@@ -88,7 +68,7 @@ bool PPCBSel::runOnMachineFunction(MachineFunction &Fn) {
unsigned BlockSize = 0;
for (MachineBasicBlock::iterator MBBI = MBB->begin(), EE = MBB->end();
MBBI != EE; ++MBBI)
BlockSize += getNumBytesForInstruction(MBBI);
BlockSize += TII->GetInstSizeInBytes(MBBI);
BlockSizes[MBB->getNumber()] = BlockSize;
FuncSize += BlockSize;
@@ -124,7 +104,7 @@ bool PPCBSel::runOnMachineFunction(MachineFunction &Fn) {
for (MachineBasicBlock::iterator I = MBB.begin(), E = MBB.end();
I != E; ++I) {
if (I->getOpcode() != PPC::BCC || I->getOperand(2).isImmediate()) {
MBBStartOffset += getNumBytesForInstruction(I);
MBBStartOffset += TII->GetInstSizeInBytes(I);
continue;
}