llvm-6502/lib/CodeGen
Chris Lattner 82e14db9a9 Add a hack to avoid some horrible code in some cases by always emitting
token chains first.  For this C function:

int test() {
  int i;
  for (i = 0; i < 100000; ++i)
    foo();
}

Instead of emitting this (condition before call)

.LBB_test_1:    ; no_exit
        addi r30, r30, 1
        lis r2, 1
        ori r2, r2, 34464
        cmpw cr2, r30, r2
        bl L_foo$stub
        bne cr2, .LBB_test_1    ; no_exit

Emit this:

.LBB_test_1:    ; no_exit
        bl L_foo$stub
        addi r30, r30, 1
        lis r2, 1
        ori r2, r2, 34464
        cmpw cr0, r30, r2
        bne cr0, .LBB_test_1    ; no_exit

Which makes it so we don't have to save/restore cr2 in the prolog/epilog of
the function.

This also makes the code much more similar to what the pattern isel produces.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23135 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-29 23:21:29 +00:00
..
SelectionDAG Add a hack to avoid some horrible code in some cases by always emitting 2005-08-29 23:21:29 +00:00
AsmPrinter.cpp Culling out use of unions for converting FP to bits and vice versa. 2005-08-17 19:34:49 +00:00
BranchFolding.cpp Remove trailing whitespace 2005-04-21 22:36:52 +00:00
ELFWriter.cpp Fix VC++ constant truncation warning. 2005-08-19 16:19:21 +00:00
IntrinsicLowering.cpp Eliminate all remaining tabs and trailing spaces. 2005-07-27 06:12:32 +00:00
LiveInterval.cpp Print the symbolic register name in a register allocator debug dump. 2005-05-14 05:34:15 +00:00
LiveInterval.h Print the symbolic register name in a register allocator debug dump. 2005-05-14 05:34:15 +00:00
LiveIntervalAnalysis.cpp Simplify this code by using higher-level LiveVariables methods 2005-08-23 22:51:41 +00:00
LiveIntervalAnalysis.h Allow the live interval analysis pass to be a bit more aggressive about 2005-03-09 23:05:19 +00:00
LiveVariables.cpp Implement LiveVariables.h change 2005-08-24 00:09:33 +00:00
MachineBasicBlock.cpp Remove trailing whitespace 2005-04-21 22:36:52 +00:00
MachineCodeEmitter.cpp new is not a valid default anywhere, so make this pure virtual 2005-07-28 18:13:59 +00:00
MachineFunction.cpp print stack object alignment in -print-machineinstr dumps 2005-05-13 22:54:44 +00:00
MachineInstr.cpp Remove trailing whitespace 2005-04-21 22:36:52 +00:00
Makefile Change Library Names Not To Conflict With Others When Installed 2004-10-27 23:18:45 +00:00
Passes.cpp Remove trailing whitespace 2005-04-21 22:36:52 +00:00
PHIElimination.cpp adjust to new live variables interface 2005-08-23 23:42:17 +00:00
PhysRegTracker.h Improved PhysRegTracker interface. RegAlloc lazily allocates the register tracker using a std::auto_ptr 2004-02-23 06:10:13 +00:00
PrologEpilogInserter.cpp Fix a bug in my previous patch that was using the wrong iterator. This fixes 2005-08-29 00:10:46 +00:00
RegAllocIterativeScan.cpp Update these register allocators to set the PhysRegUsed info in MachineFunction. 2005-01-23 22:45:13 +00:00
RegAllocLinearScan.cpp Keep track of which registers are related to which other registers. 2005-08-23 22:27:31 +00:00
RegAllocLocal.cpp adjust to new live variables interface 2005-08-23 23:42:17 +00:00
RegAllocSimple.cpp Convert tabs to spaces 2005-04-22 04:01:18 +00:00
TwoAddressInstructionPass.cpp Remove trailing whitespace 2005-04-21 22:36:52 +00:00
UnreachableBlockElim.cpp Remove trailing whitespace 2005-04-21 22:36:52 +00:00
VirtRegMap.cpp Remove trailing whitespace 2005-04-21 22:36:52 +00:00
VirtRegMap.h Remove trailing whitespace 2005-04-21 22:36:52 +00:00