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e165a78551
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14124 Commits

Author SHA1 Message Date
Evan Cheng
e165a78551 Refactor scheduler code. Move register-reduction list scheduler to a 
separate file. Added an initial implementation of top-down register pressure
reduction list scheduler.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28226 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-05-11 23:55:42 +00:00
Chris Lattner
e993cc27ad Significantly revamp allocation of machine code to use free lists, real 
allocation policies and much more.  All this complexity, and we have no
functionality change, woo! :)


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28225 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-05-11 23:08:08 +00:00
Chris Lattner
8c8c66a8cd Refactor some code, making it simpler. 
When doing the initial pass of constant folding, if we get a constantexpr,
simplify the constant expr like we would do if the constant is folded in the
normal loop.

This fixes the missed-optimization regression in
Transforms/InstCombine/getelementptr.ll last night.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28224 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-05-11 17:11:52 +00:00
Evan Cheng
f4df680ad4 Add MOV16_rm / MOV32_rm and MOV16_mr / MOV32_mr to isLoadFromStackSlot and isStoreToStackSlot 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28223 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-05-11 07:33:49 +00:00
Evan Cheng
993141402f Set weight of zero length intervals to infinite to prevent them from being 
spilled.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28220 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-05-11 07:29:24 +00:00
Evan Cheng
5d02eafaf2 Backing out previous check-in. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28219 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-05-11 07:28:16 +00:00
Evan Cheng
1f300190f3 If the live interval legnth is essentially zero, i.e. in every live range 
the use follows def immediately, it doesn't make sense to spill it and
hope it will be easier to allocate for this LI.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28217 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-05-10 22:30:41 +00:00
Chris Lattner
f4f5a77fdc Two changes: 
1. Implement InstCombine/deadcode.ll by not adding instructions in unreachable
   blocks (due to constants in conditional branches/switches) to the worklist.
   This causes them to be deleted before instcombine starts up, leading to
   better optimization.

2. In the prepass over instructions, do trivial constprop/dce as we go.  This
   has the effect of improving the effectiveness of #1.  In addition, it
   *significantly* speeds up instcombine on test cases with large amounts of
   constant folding code (for example, that produced by code specialization
   or partial evaluation).  In one example, it speeds up instcombine from
   0.0589s to 0.0224s with a release build (a 2.6x speedup).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28215 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-05-10 19:00:36 +00:00
Chris Lattner
3e6a35076e Fix the PowerPC JIT-only failure on UnitTests/Vector/sumarray-dbl, which is 
really a bad codegen bug that LLC happens to get lucky with. I must chat with
Nate for the proper fix.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28213 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-05-10 06:38:32 +00:00
Evan Cheng
90db0358bb Templatify RegReductionPriorityQueue 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28212 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-05-10 06:16:44 +00:00
Chris Lattner
e46749cce0 Add an assertion for a common error 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28210 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-05-10 04:32:43 +00:00
Nate Begeman
ec57fd91af Fix PR773 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28207 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-05-09 18:20:51 +00:00
Chris Lattner
c8d37c6e14 Fix a regression in my patch from last night that broke the llvmgcc4 build on 
ppc


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28205 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-05-09 16:41:59 +00:00
Chris Lattner
219f1b535d Indent .data/.text in the .s file 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28204 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-05-09 16:15:00 +00:00
Evan Cheng
b63b067925 Add pseudo dependency to force a def&use operand to be scheduled last (unless 
the distance between the def and another use is much longer). This is under
option control for now "-sched-lower-defnuse".


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28201 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-05-09 07:13:34 +00:00
Evan Cheng
60e8c71c9f Debugging info 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28200 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-05-09 06:55:15 +00:00
Evan Cheng
8399c5cbe4 Remove a completed entry. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28199 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-05-09 06:54:05 +00:00
Evan Cheng
e73701df94 PR 770 - permit coallescing of registers in subset register classes. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28197 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-05-09 06:37:48 +00:00
Chris Lattner
7faec9b93a Implement MASM sections correctly, without a "has masm sections flag" and a bunch of special case code. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28194 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-05-09 05:33:48 +00:00
Chris Lattner
a7090ae7a3 Oh yeah, there are two of these now, unify both. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28192 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-05-09 05:24:50 +00:00
Chris Lattner
b81cb6133e Setting SwitchToSectionDirective properly in the MASM backend permits a bunch 
of code to be unified.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28191 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-05-09 05:23:12 +00:00
Chris Lattner
c9260a1556 MASM doesn't have one of these. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28190 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-05-09 05:21:47 +00:00
Chris Lattner
23b9eac4cb Don't prefix section directives with a tab. Doing so causes blank lines to 
be emitted to the .s file.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28189 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-05-09 05:19:59 +00:00
Chris Lattner
13f161c518 Make the masm codepath work like the normal code path. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28188 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-05-09 05:15:58 +00:00
Chris Lattner
e7027d5339 Preserve prior behavior 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28187 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-05-09 05:15:24 +00:00
Chris Lattner
4ca4bb1ed2 The MASM asmprinter has been fixed, these hacks are no longer needed. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28186 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-05-09 05:13:34 +00:00
Chris Lattner
dad9c5a14f Fix the MASM asmprinter's lies. It does not want to emit code to .text/.data 
it wants it emitted to _text/_data.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28185 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-05-09 05:12:53 +00:00
Chris Lattner
4632d7a570 Split SwitchSection into SwitchTo{Text|Data}Section methods. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28184 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-05-09 04:59:56 +00:00
Chris Lattner
4c15e33946 Some notes and thoughts to myself 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28182 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-05-09 04:58:46 +00:00
Chris Lattner
8d89e7bdbc Patch to make some xforms preserve each other. Patch contributed by 
Domagoj Babic!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28181 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-05-09 04:13:41 +00:00
Chris Lattner
e7fd553b3b Move some methods out of line so that MutexGuard.h isn't needed in a public header. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28179 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-05-08 22:00:52 +00:00
Chris Lattner
9fd868ae0a Another bad case I noticed 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28177 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-05-08 21:39:45 +00:00
Chris Lattner
8ef67ac3c3 add a note 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28176 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-05-08 21:24:21 +00:00
Chris Lattner
4b37e87ab9 Make the case I just checked in stronger. Now we compile this: 
short test2(short X, short x) {
  int Y = (short)(X+x);
  return Y >> 1;
}

to:

_test2:
        add r2, r3, r4
        extsh r2, r2
        srawi r3, r2, 1
        blr

instead of:

_test2:
        add r2, r3, r4
        extsh r2, r2
        srwi r2, r2, 1
        extsh r3, r2
        blr


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28175 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-05-08 21:18:59 +00:00
Chris Lattner
eaeda56649 Implement and_sext.ll:test3, generating: 
_test4:
        srawi r3, r3, 16
        blr

instead of:

_test4:
        srwi r2, r3, 16
        extsh r3, r2
        blr

for:

short test4(unsigned X) {
  return (X >> 16);
}


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28174 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-05-08 20:59:41 +00:00
Nate Begeman
7514620052 Yet more readme updating 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28172 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-05-08 20:54:02 +00:00
Chris Lattner
a850446a0b Compile this: 
short test4(unsigned X) {
  return (X >> 16);
}

to:

_test4:
        movl 4(%esp), %eax
        sarl $16, %eax
        ret

instead of:

_test4:
        movl $-65536, %eax
        andl 4(%esp), %eax
        sarl $16, %eax
        ret


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28171 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-05-08 20:51:54 +00:00
Nate Begeman
fcf64a91d6 New note about something bad happening in target independent optimizers 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28170 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-05-08 20:08:28 +00:00
Nate Begeman
d8624ed07f Proving once again that I am not as smart as the compiler 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28169 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-05-08 19:09:24 +00:00
Nate Begeman
4667f2cbad Fold more shifts into inserts, and update the README 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28168 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-05-08 17:38:32 +00:00
Chris Lattner
2cfd6746ae Fold shifts with undef operands. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28167 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-05-08 17:29:49 +00:00
Chris Lattner
1b7371331f When tracking demanded bits, if any bits from the sext of an SRA are demanded, 
then so is the input sign bit.  This fixes mediabench/g721 on X86.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28166 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-05-08 17:22:53 +00:00
Nate Begeman
17c275ff2c Make emission of jump tables a bit less conservative; they are now required 
to be only 31.25% dense, rather than 75% dense.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28165 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-05-08 16:51:36 +00:00
Evan Cheng
403be7eafc Fixing truncate. Previously we were emitting truncate from r16 to r8 as 
movw. That is we promote the destination operand to r16. So
        %CH = TRUNC_R16_R8 %BP
is emitted as
        movw %bp, %cx.

This is incorrect. If %cl is live, it would be clobbered.
Ideally we want to do the opposite, that is emitted it as
        movb ??, %ch
But this is not possible since %bp does not have a r8 sub-register.

We are now defining a new register class R16_ which is a subclass of R16
containing only those 16-bit registers that have r8 sub-registers (i.e.
AX - DX). We isel the truncate to two instructions, a MOV16to16_ to copy the
value to the R16_ class, followed by a TRUNC_R16_R8.

Due to bug 770, the register colaescer is not going to coalesce between R16 and
R16_. That will be fixed later so we can eliminate the MOV16to16_. Right now, it
can only be eliminated if we are lucky that source and destination registers are
the same.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28164 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-05-08 08:01:26 +00:00
Nate Begeman
93376b083e Update some stuff now that the new rlwimi code has gone in 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28162 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-05-08 02:52:38 +00:00
Nate Begeman
5c742681ed Fix PR772 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28161 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-05-08 01:35:01 +00:00
Evan Cheng
74811450b2 Typo's 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28158 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-05-07 10:10:20 +00:00
Jeff Cohen
e564de2d37 Unlike Unix, Windows won't let a file be implicitly replaced via renaming without explicit permission. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28157 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-05-07 02:51:51 +00:00
Nate Begeman
77f361f5b3 New rlwimi implementation, which is superior to the old one. There are 
still a couple missed optimizations, but we now generate all the possible
rlwimis for multiple inserts into the same bitfield.  More regression tests
to come.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28156 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-05-07 00:23:38 +00:00
Chris Lattner
822db93e57 Use ComputeMaskedBits to determine # sign bits as a fallback. This allows us 
to handle all kinds of stuff, including silly things like:
sextinreg(setcc,i16) -> setcc.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28155 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-05-06 23:48:13 +00:00