llvm-6502/lib/Target/PowerPC
Chris Lattner d242419e17 remove broken SRA/rlwimi case
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23746 91177308-0d34-0410-b5e6-96231b3b80d8
2005-10-15 19:04:48 +00:00
..
.cvsignore ignore generated files. 2004-11-21 00:00:54 +00:00
LICENSE.TXT Added Louis Gerbarg. Louis is given credit in the CREDITS.TXT file, so I 2004-08-05 23:46:27 +00:00
Makefile Eliminate PowerPC.td and PPC32.td, consolidating them into PPC.td 2005-10-14 23:37:35 +00:00
PPC.h Eliminate PowerPC.td and PPC32.td, consolidating them into PPC.td 2005-10-14 23:37:35 +00:00
PPC.td Rename PowerPC*.td -> PPC*.td 2005-10-14 23:40:39 +00:00
PPCAsmPrinter.cpp Rename PPC32*.h to PPC*.h 2005-10-14 23:59:06 +00:00
PPCBranchSelector.cpp Rename PPC32*.h to PPC*.h 2005-10-14 23:59:06 +00:00
PPCCodeEmitter.cpp Rename PPC32*.h to PPC*.h 2005-10-14 23:59:06 +00:00
PPCFrameInfo.h Rename PowerPC*.h to PPC*.h 2005-10-14 23:51:18 +00:00
PPCInstrBuilder.h Remove trailing whitespace 2005-04-21 23:30:14 +00:00
PPCInstrFormats.td Nuke PowerPCInstrFormats.h, its contents are dead. Remove the definitions 2005-10-14 22:44:13 +00:00
PPCInstrInfo.cpp Rename PPC32*.h to PPC*.h 2005-10-14 23:59:06 +00:00
PPCInstrInfo.h Rename PPC32*.h to PPC*.h 2005-10-14 23:59:06 +00:00
PPCInstrInfo.td Rename PowerPC*.td -> PPC*.td 2005-10-14 23:40:39 +00:00
PPCISelDAGToDAG.cpp Rename PPC32*.h to PPC*.h 2005-10-14 23:59:06 +00:00
PPCISelLowering.cpp Rename PPC32*.h to PPC*.h 2005-10-14 23:59:06 +00:00
PPCISelLowering.h Rename PowerPC*.h to PPC*.h 2005-10-14 23:51:18 +00:00
PPCISelPattern.cpp remove broken SRA/rlwimi case 2005-10-15 19:04:48 +00:00
PPCJITInfo.cpp Rename PPC32*.h to PPC*.h 2005-10-14 23:59:06 +00:00
PPCJITInfo.h Merge PPCJITInfo.h and PPC32JITInfo.h. Note that the PowerPCJITInfo 2005-10-14 23:53:41 +00:00
PPCRegisterInfo.cpp Rename PPC32*.h to PPC*.h 2005-10-14 23:59:06 +00:00
PPCRegisterInfo.h Rename PowerPC*.h to PPC*.h 2005-10-14 23:51:18 +00:00
PPCRegisterInfo.td Remove an unnecsesary file. PPC32 and PPC64 share architected registers. 2005-10-14 18:58:46 +00:00
PPCRelocations.h Eliminate tabs and trailing spaces. 2005-07-27 05:53:44 +00:00
PPCSubtarget.cpp Rename PowerPC*.h to PPC*.h 2005-10-14 23:51:18 +00:00
PPCSubtarget.h copy and paste error 2005-09-29 21:11:57 +00:00
PPCTargetMachine.cpp Rename PPC32*.h to PPC*.h 2005-10-14 23:59:06 +00:00
PPCTargetMachine.h Rename PPC32*.h to PPC*.h 2005-10-14 23:59:06 +00:00
README.txt Add note about future optimization noted in the ppc compiler writer's guide 2005-09-06 15:30:48 +00:00

TODO:
* gpr0 allocation
* implement do-loop -> bdnz transform
* implement powerpc-64 for darwin
* use stfiwx in float->int
* be able to combine sequences like the following into 2 instructions:
	lis r2, ha16(l2__ZTV4Cell)
	la r2, lo16(l2__ZTV4Cell)(r2)
	addi r2, r2, 8

* Teach LLVM how to codegen this:
unsigned short foo(float a) { return a; }
as:
_foo:
        fctiwz f0,f1
        stfd f0,-8(r1)
        lhz r3,-2(r1)
        blr
not:
_foo:
        fctiwz f0, f1
        stfd f0, -8(r1)
        lwz r2, -4(r1)
        rlwinm r3, r2, 0, 16, 31
        blr


* Support 'update' load/store instructions.  These are cracked on the G5, but
  are still a codesize win.

* Add a custom legalizer for the GlobalAddress node, to move the funky darwin
  stub stuff from the instruction selector to the legalizer (exposing low-level
  operations to the dag for optzn.  For example, we want to codegen this:

        int A = 0;
        void B() { A++; }
  as:
        lis r9,ha16(_A)
        lwz r2,lo16(_A)(r9)
        addi r2,r2,1
        stw r2,lo16(_A)(r9)
  not:
        lis r2, ha16(_A)
        lwz r2, lo16(_A)(r2)
        addi r2, r2, 1
        lis r3, ha16(_A)
        stw r2, lo16(_A)(r3)

* 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:
	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

===-------------------------------------------------------------------------===

* Codegen this:

   void test2(int X) {
     if (X == 0x12345678) bar();
   }

    as:

       xoris r0,r3,0x1234
       cmpwi cr0,r0,0x5678
       beq cr0,L6

    not:

        lis r2, 4660
        ori r2, r2, 22136 
        cmpw cr0, r3, r2  
        bne .LBB_test2_2

===-------------------------------------------------------------------------===

Lump the constant pool for each function into ONE pic object, and reference
pieces of it as offsets from the start.  For functions like this (contrived
to have lots of constants obviously):

double X(double Y) { return (Y*1.23 + 4.512)*2.34 + 14.38; }

We generate:

_X:
        lis r2, ha16(.CPI_X_0)
        lfd f0, lo16(.CPI_X_0)(r2)
        lis r2, ha16(.CPI_X_1)
        lfd f2, lo16(.CPI_X_1)(r2)
        fmadd f0, f1, f0, f2
        lis r2, ha16(.CPI_X_2)
        lfd f1, lo16(.CPI_X_2)(r2)
        lis r2, ha16(.CPI_X_3)
        lfd f2, lo16(.CPI_X_3)(r2)
        fmadd f1, f0, f1, f2
        blr

It would be better to materialize .CPI_X into a register, then use immediates
off of the register to avoid the lis's.  This is even more important in PIC 
mode.

===-------------------------------------------------------------------------===

Implement Newton-Rhapson method for improving estimate instructions to the
correct accuracy, and implementing divide as multiply by reciprocal when it has
more than one use.  Itanium will want this too.