llvm-6502/lib/Target/PowerPC
Misha Brukman 4ffddc5228 * Temporarily suspend LR save/restore optimization as it is not quite correct
* Implement large fixed-size allocas            Entire patch by Nate Begeman.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15345 91177308-0d34-0410-b5e6-96231b3b80d8
2004-07-30 15:50:45 +00:00
..
Makefile Renamed files: 2004-07-27 23:29:16 +00:00
PowerPC.td Renamed files: 2004-07-27 23:29:16 +00:00
PowerPCAsmPrinter.cpp Minor corrections 2004-07-28 20:18:53 +00:00
PowerPCCodeEmitter.cpp Initial revision 2004-06-21 16:55:25 +00:00
PowerPCInstrInfo.cpp ADDI can take several forms, including: 2004-07-26 21:50:38 +00:00
PowerPCInstrInfo.h Moved definition of invertPPCBranchOpcode() into PowerPCInstrInfo class. 2004-07-27 18:34:11 +00:00
PowerPCISelSimple.cpp Simplify loading (un)signed constants to registers, patch by Nate Begeman. 2004-07-28 19:13:49 +00:00
PowerPCRegisterInfo.cpp * Temporarily suspend LR save/restore optimization as it is not quite correct 2004-07-30 15:50:45 +00:00
PowerPCRegisterInfo.h Remove empty unused method processFunctionBeforeFrameFinalized() 2004-07-27 18:38:40 +00:00
PowerPCTargetMachine.h * Codegen of GEPs dramatically improved by folding multiplies and adds 2004-07-23 16:08:20 +00:00
PPC32AsmPrinter.cpp Minor corrections 2004-07-28 20:18:53 +00:00
PPC32ISelSimple.cpp Simplify loading (un)signed constants to registers, patch by Nate Begeman. 2004-07-28 19:13:49 +00:00
PPC.h Add PowerPCBranchSelector to discover which are `long' branches. 2004-07-27 18:33:06 +00:00
PPCAsmPrinter.cpp Minor corrections 2004-07-28 20:18:53 +00:00
PPCBranchSelector.cpp Remove an extra 8 byte distance penalty. Patch by Nate Begeman. 2004-07-28 19:13:07 +00:00
PPCCodeEmitter.cpp Initial revision 2004-06-21 16:55:25 +00:00
PPCInstrBuilder.h * Wrap long lines (comments and code) 2004-07-07 20:01:36 +00:00
PPCInstrInfo.td Renamed files: 2004-07-27 23:29:16 +00:00
PPCJITInfo.h Initial revision 2004-06-21 16:55:25 +00:00
PPCRegisterInfo.td Renamed files: 2004-07-27 23:29:16 +00:00
PPCTargetMachine.cpp Run the branch selection pass right before the asm printer. 2004-07-27 18:39:34 +00:00
README.txt Add notes on bug involving casting ulong -> double, thanks to Nate Begeman. 2004-07-28 19:16:10 +00:00

Currently unimplemented:
* cast fp to bool
* signed right shift of long by reg

Current bugs:
* large fixed-size allocas not correct, although should
  be closer to working.  Added code in PPCRegisterInfo.cpp
  to do >16bit subtractions to the stack pointer.
* ulong to double.  ahhh, here's the problem:
  floatdidf assumes signed longs.  so if the high but of a ulong
  just happens to be set, you get the wrong sign.  The fix for this
  is to call cmpdi2 to compare against zero, if so shift right by one,
  convert to fp, and multiply by (add to itself).  the sequence would
  look like:
  {r3:r4} holds ulong a;
  li r5, 0
  li r6, 0 (set r5:r6 to ulong 0)
  call cmpdi2 ==> sets r3 <, =, > 0
  if r3 > 0
  call floatdidf as usual
  else
  shift right ulong a, 1 (we could use emitShift)
  call floatdidf
  fadd f1, f1, f1 (fp left shift by 1)
* linking llvmg++ .s files with gcc instead of g++

Codegen improvements needed:
* no alias analysis causes us to generate slow code for Shootout/matrix
* setCondInst needs to know branchless versions of seteq/setne/etc
* cast elimination pass (uint -> sbyte -> short, kill the byte -> short)
* should hint to the branch select pass that it doesn't need to print the
  second unconditional branch, so we don't end up with things like:
.LBBl42__2E_expand_function_8_21:	; LeafBlock37
	cmplwi cr0, r29, 11
	bne cr0, $+8
	b .LBBl42__2E_expand_function_8_674	; loopentry.24
	b .LBBl42__2E_expand_function_8_42	; NewDefault
	b .LBBl42__2E_expand_function_8_42	; NewDefault

Current hacks:
* lazy insert of GlobalBaseReg definition at front of first MBB
  A prime candidate for sabre's "slightly above ISel" passes.
* cast code is huge, unwieldy.  Should probably be broken up into
  smaller pieces.
* visitLoadInst is getting awfully cluttered as well.

Currently failing tests:
* SingleSource
  `- Regression
  |  `- 2003-05-22-VarSizeArray
  `- Benchmarks
  |  `- Shootout-C++ : most programs fail, miscompilations
  `- UnitTests
  |   `- C++Catch
  |   `- SimpleC++Test
  `- ConditionalExpr
  `- casts
  `- sumarray2d: large alloca miscompiled
  `- test_indvars
* MultiSource
  |- Applications
  |  `- burg: miscompilation
  |  `- siod: llc bus error
  |  `- hbd: miscompilation
  |  `- d (make_dparser): miscompilation
  `- Benchmarks
     `- MallocBench/make: branch target too far