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Remove BRTWOWAY*

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Make the PPC backend not dependent on BRTWOWAY_CC and make the branch
selector smarter about the code it generates, fixing a case in the
readme.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26814 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nate Begeman
2006-03-17 01:40:33 +00:00
parent e261c474ca
commit 81e8097377
15 changed files with 21 additions and 283 deletions
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lib/Target/PowerPC/PPCBranchSelector.cpp
+2 -6
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@@ -48,10 +48,10 @@ FunctionPass *llvm::createPPCBranchSelectionPass() {
static unsigned getNumBytesForInstruction(MachineInstr *MI) {
switch (MI->getOpcode()) {
case PPC::COND_BRANCH:
// while this will be 4 most of the time, if we emit 12 it is just a
// while this will be 4 most of the time, if we emit 8 it is just a
// minor pessimization that saves us from having to worry about
// keeping the offsets up to date later when we emit long branch glue.
return 12;
return 8;
case PPC::IMPLICIT_DEF_GPR: // no asm emitted
case PPC::IMPLICIT_DEF_F4: // no asm emitted
case PPC::IMPLICIT_DEF_F8: // no asm emitted
@@ -102,7 +102,6 @@ bool PPCBSel::runOnMachineFunction(MachineFunction &Fn) {
// long branch:
// bInverseCC $PC+8
// b .L_TARGET_MBB
// b .L_FALLTHROUGH_MBB
for (MachineFunction::iterator MFI = Fn.begin(), E = Fn.end(); MFI != E;
++MFI) {
MachineBasicBlock *MBB = MFI;
@@ -123,8 +122,6 @@ bool PPCBSel::runOnMachineFunction(MachineFunction &Fn) {
// 3. fallthrough MBB
MachineBasicBlock *trueMBB =
MBBI->getOperand(2).getMachineBasicBlock();
MachineBasicBlock *falseMBB =
MBBI->getOperand(3).getMachineBasicBlock();
int Displacement = OffsetMap[trueMBB] - ByteCount;
unsigned Opcode = MBBI->getOperand(1).getImmedValue();
@@ -136,7 +133,6 @@ bool PPCBSel::runOnMachineFunction(MachineFunction &Fn) {
} else {
BuildMI(*MBB, MBBJ, Inverted, 2).addReg(CRReg).addSImm(8);
BuildMI(*MBB, MBBJ, PPC::B, 1).addMBB(trueMBB);
BuildMI(*MBB, MBBJ, PPC::B, 1).addMBB(falseMBB);
}
// Erase the psuedo COND_BRANCH instruction, and then back up the