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29 Commits

Author SHA1 Message Date
Chris Lattner 75bac9f786 Comment out debug code :) 
Select [mem] += Val operations.  For constants, we used to get:

  mov %ECX, -32768
  add %ECX, DWORD PTR [l4_match_start]
  mov DWORD PTR [l4_match_start], %ECX

Now we get:

  add DWORD PTR [l4_match_start], -32768

For other values we used to get:

  mov %EBP, %EDI   ;; because the add destroys the value
  add %EBP, DWORD PTR [l4_input_len]
  mov DWORD PTR [l4_input_len], %EBP

now we get:

  add DWORD PTR [l4_input_len], %EDI

Both of these use less registers than the alternative, are faster and smaller.

llvm-svn: 19488
 2005-01-11 23:21:30 +00:00
Chris Lattner 8aa10fcd1b Treat int constants as not requiring a register, since they are almost always 
folded into an instruction.

llvm-svn: 19486
 2005-01-11 22:29:12 +00:00
Chris Lattner 62b22420be * Factor a bunch of binary operator cases into shared code. 
* Fold loads into Add, sub, and, or, xor and mul when possible.
* Codegen shl X, 1 as add X, X

llvm-svn: 19483
 2005-01-11 21:19:59 +00:00
Chris Lattner 8cf9cdae3d Fold multiplies by 3,5,9 into addressing modes when possible. 
llvm-svn: 19480
 2005-01-11 19:37:02 +00:00
Chris Lattner b74ec4cd24 Instead of generating stuff like this: 
mov %ECX, %EAX
        add %ECX, 32768
        mov %SI, WORD PTR [2*%ECX + l13_prev]

Generate this:

        mov %SI, WORD PTR [2*%ECX + l13_prev + 65536]

This occurs when you have a GEP instruction where an index is
"something + imm".

llvm-svn: 19472
 2005-01-11 06:36:20 +00:00
Chris Lattner c07164e909 Implement MEMCPY natively in terms of rep movs* 
llvm-svn: 19468
 2005-01-11 06:19:26 +00:00
Chris Lattner 36f7848b26 Implement memset -> rep stos* 
llvm-svn: 19467
 2005-01-11 06:14:36 +00:00
Chris Lattner a19f84240f Announce that we don't support mem ops yet. 
llvm-svn: 19466
 2005-01-11 05:57:36 +00:00
Chris Lattner 378262d33b Teach the address selector to make 'reg+reg' addressing modes. 
llvm-svn: 19457
 2005-01-11 04:40:19 +00:00
Chris Lattner 9d7cf998ca Emit NOT instructions. 
llvm-svn: 19455
 2005-01-11 04:31:30 +00:00
Chris Lattner 37ed28558f Fix a bug emitting branches that broke a lot of programs. 
llvm-svn: 19452
 2005-01-11 04:06:27 +00:00
Chris Lattner e44e6d16fb Be more careful where we set ContainsFPCode. We were missing a set in the 
int -> FP casting code.  Note that we don't have to set it for FP operations
that take FP values as operands: whatever produces the FP value will set the
flag.

llvm-svn: 19451
 2005-01-11 03:50:45 +00:00
Chris Lattner 8fea42bd6d Fix a major bug in setcc/cmov folding, where we accidentally 
inverted the sense of the comparison.

llvm-svn: 19450
 2005-01-11 03:37:59 +00:00
Chris Lattner 0d1f82ac2f Take register pressure into account when we have to decide whether to 
evaluate the LHS or the RHS of an operation first.  This causes good things
to happen.  For example, instead of compiling a loop to this:

.LBBstrength_result7_1: # loopentry
        movl 16(%esp), %edi
        movl (%edi), %edi             ;;; LOAD
        movl (%ecx), %ebx
        movl $2, (%eax,%ebx,4)
        movl (%edx), %ebx
        movl %esi, %ebp
        addl $21, %ebp
        addl $42, %esi
        cmpl $0, %edi                 ;;; USE
        cmovne %esi, %ebp
        cmpl %ebp, %ebx
        movl %ebp, %esi
        jg .LBBstrength_result7_1

We now compile it to this:

.LBBstrength_result7_1: # loopentry
        movl %edi, %ebx
        addl $42, %ebx
        addl $21, %edi
        movl (%ecx), %ebp              ;; LOAD
        cmpl $0, %ebp                  ;; USE
        cmovne %ebx, %edi
        movl (%edx), %ebx
        movl $2, (%eax,%ebx,4)
        movl (%esi), %ebx
        cmpl %edi, %ebx
        jg .LBBstrength_result7_1

Which reduces register pressure enough (in this case) to avoid spilling in the
loop.

As another example, consider the CodeGen/X86/regpressure.ll testcase.  We
used to generate this code for both cases:

regpressure1:
        subl $32, %esp
        movl %esi, 12(%esp)
        movl %edi, 8(%esp)
        movl %ebx, 4(%esp)
        movl %ebp, (%esp)
        movl 36(%esp), %ecx
        movl (%ecx), %eax
        movl 4(%ecx), %edx
        movl %edx, 24(%esp)
        movl 8(%ecx), %edx
        movl %edx, 16(%esp)
        movl 12(%ecx), %edx
        movl 16(%ecx), %esi
        movl 20(%ecx), %edi
        movl 24(%ecx), %ebx
        movl %ebx, 28(%esp)
        movl 28(%ecx), %ebx
        movl 32(%ecx), %ebp
        movl %ebp, 20(%esp)
        movl 36(%ecx), %ecx
        imull 24(%esp), %eax
        imull 16(%esp), %eax
        imull %edx, %eax
        imull %esi, %eax
        imull %edi, %eax
        imull 28(%esp), %eax
        imull %ebx, %eax
        imull 20(%esp), %eax
        imull %ecx, %eax
        movl (%esp), %ebp
        movl 4(%esp), %ebx
        movl 8(%esp), %edi
        movl 12(%esp), %esi
        addl $32, %esp
        ret

This code is basically trying to do all of the loads first, then execute all
of the multiplies.  Because we run out of registers, lots of spill code happens.
We now generate this code for both cases:

regpressure1:
        movl 4(%esp), %ecx
        movl (%ecx), %eax
        movl 4(%ecx), %edx
        imull %edx, %eax
        movl 8(%ecx), %edx
        imull %edx, %eax
        movl 12(%ecx), %edx
        imull %edx, %eax
        movl 16(%ecx), %edx
        imull %edx, %eax
        movl 20(%ecx), %edx
        imull %edx, %eax
        movl 24(%ecx), %edx
        imull %edx, %eax
        movl 28(%ecx), %edx
        imull %edx, %eax
        movl 32(%ecx), %edx
        imull %edx, %eax
        movl 36(%ecx), %ecx
        imull %ecx, %eax
        ret

which is much nicer (when we fold loads into the muls it will be even better).
The old instruction selector used to produce the good code for regpressure1
but not for regpressure2, as it depended on the order of operations in the
LLVM code.

llvm-svn: 19449
 2005-01-11 03:11:44 +00:00
Chris Lattner 1d13a92af4 Fold setcc instructions into selects. 
llvm-svn: 19438
 2005-01-10 22:10:13 +00:00
Chris Lattner 750d38b5b7 Implement 8-bit multiply for X86. 
llvm-svn: 19435
 2005-01-10 20:55:48 +00:00
Chris Lattner cf8fd0c0db Codegen (Reg|imm)+&GV as an LEA, because we cannot put it into the immediate field 
of an ADDri (due to current restrictions on MachineOperand :( ).  This allows
us to generate:

        leal Data+16000, %edx

instead of:

        movl $Data, %edx
        addl $16000, %edx

llvm-svn: 19420
 2005-01-09 20:20:29 +00:00
Chris Lattner 66d3430236 Fix copy and pasto's for FP -> Int. This fixes fldry 
llvm-svn: 19418
 2005-01-09 19:49:59 +00:00
Chris Lattner 282781c797 Initial implementation of FP->INT and INT->FP casts 
Also, fix zero_extend from bool to i8, which fixes Shootout/objinst.

llvm-svn: 19414
 2005-01-09 18:52:44 +00:00
Chris Lattner 9f59d28d67 Implement varargs and returnaddress/frameaddress intrinsics. With this 
patch, all of SingleSource/UnitTests passes.

llvm-svn: 19408
 2005-01-09 00:01:27 +00:00
Chris Lattner 313ddb59c9 Okay 15th time is the charm. Looking at the vector size is useless as it 
gets clobbered by a previous statement.  This fixes all calls finally.

llvm-svn: 19399
 2005-01-08 20:51:36 +00:00
Chris Lattner f5bbe85879 Okay, my off by one was actually off by two. This fixes Generic/2003-07-07-BadLongConst.ll 
llvm-svn: 19398
 2005-01-08 20:39:31 +00:00
Chris Lattner a183eb75eb Fix off by one error 
llvm-svn: 19396
 2005-01-08 20:31:34 +00:00
Chris Lattner b52e041c80 Adjust to changes in LowerCallTo interface 
Minor bugfixes

llvm-svn: 19376
 2005-01-08 19:28:19 +00:00
Chris Lattner 88c8a23891 Reimplementation of the X86 pattern isel. This is still missing many large 
pieces, but can already do amazing things in some cases.

llvm-svn: 19334
 2005-01-07 07:49:41 +00:00
Chris Lattner ce413c8c9f This file is now dead. 
llvm-svn: 19333
 2005-01-07 07:49:05 +00:00
Chris Lattner 1d088db15e Disable the pattern isel 
llvm-svn: 15787
 2004-08-15 23:02:17 +00:00
Misha Brukman cf7d3af07f Fix file header as it has been renamed. 
llvm-svn: 15239
 2004-07-26 18:45:48 +00:00
Misha Brukman bca562404c Renamed files to have the `X86' prefix for uniqueness purposes. 
All CVS history was renamed, the *,v were copied over.  No worries.

llvm-svn: 15238
 2004-07-26 18:43:11 +00:00