Chris Lattner
efa13b2edd
implement support for sinking a load out the bottom of a block that
...
has no stores between the load and the end of block. This works
great and sinks hundreds of stores, but we can't turn it on because
machineinstrs don't have volatility information and we don't want to
sink volatile stores :(
llvm-svn: 45894
2008-01-12 00:17:41 +00:00
Chris Lattner
bfffa4f21e
Simplify the side effect stuff a bit more and make licm/sinking
...
both work right according to the new flags.
This removes the TII::isReallySideEffectFree predicate, and adds
TII::isInvariantLoad.
It removes NeverHasSideEffects+MayHaveSideEffects and adds
UnmodeledSideEffects as machine instr flags. Now the clients
can decide everything they need.
I think isRematerializable can be implemented in terms of the
flags we have now, though I will let others tackle that.
llvm-svn: 45843
2008-01-10 23:08:24 +00:00
Chris Lattner
e5b817779c
Clamp down on sinking of lots of instructions.
...
llvm-svn: 45841
2008-01-10 22:35:15 +00:00
Duncan Sands
2c89976416
Output sinl for a long double FSIN node, not sin.
...
Likewise fix up a bunch of other libcalls. While
there I remove NEG_F32 and NEG_F64 since they are
not used anywhere. This fixes 9 Ada ACATS failures.
llvm-svn: 45833
2008-01-10 10:28:30 +00:00
Evan Cheng
444d24972f
Only remat loads from immutable stack slots.
...
llvm-svn: 45831
2008-01-10 08:24:38 +00:00
Evan Cheng
6e03db7604
Simplify some code.
...
llvm-svn: 45830
2008-01-10 08:22:10 +00:00
Owen Anderson
59c3242247
Don't use LiveVariables::VarInfo::DefInst.
...
llvm-svn: 45815
2008-01-10 03:12:54 +00:00
Dale Johannesen
fdd4b3846f
Emit unused EH frames for weak definitions on Darwin,
...
because assembler/linker can't cope with weak absolutes.
PR 1880.
llvm-svn: 45811
2008-01-10 02:03:30 +00:00
Owen Anderson
a8f32828c8
Get rid of all uses of LiveVariables::VarInfo::DefInst in favor of the equivalent API from
...
MachineRegisterInfo. Once all clients are switched over, the former will be going away.
llvm-svn: 45805
2008-01-10 01:36:43 +00:00
Owen Anderson
e2b710013f
Add more comments explaining the basics of how the decision of when to rename and when to insert
...
copies is made.
llvm-svn: 45799
2008-01-10 00:47:01 +00:00
Owen Anderson
a0e5b9a317
Get rid of the isKillInst predicate. LiveVariables already provides this information.
...
llvm-svn: 45797
2008-01-10 00:33:11 +00:00
Owen Anderson
b5be87349c
Copies need to be inserted before the first terminator, not at the end of the block.
...
llvm-svn: 45791
2008-01-10 00:01:41 +00:00
Evan Cheng
ba0214a6cb
Special copy SUnit's do not have SDNode's.
...
llvm-svn: 45787
2008-01-09 23:01:55 +00:00
Owen Anderson
62bb891e23
Clean up StrongPHIElimination a bit, and add some more comments to the internal structures. There's
...
still more work to do on this front.
llvm-svn: 45783
2008-01-09 22:40:54 +00:00
Owen Anderson
9555739636
StrongPHIElim: Now with even fewer trivial bugs!
...
llvm-svn: 45775
2008-01-09 10:41:39 +00:00
Owen Anderson
c937ae34a5
Fix an infinite recursion bug in InsertCopies.
...
llvm-svn: 45774
2008-01-09 10:32:30 +00:00
Owen Anderson
01e1f23391
Fix some simple bugs. StrongPHIElimination now does not crash on 164.gzip.
...
llvm-svn: 45773
2008-01-09 06:19:05 +00:00
Chris Lattner
c93ad7d569
Make load->store deletion a bit smarter. This allows us to compile this:
...
void test(long long *P) { *P ^= 1; }
into just:
_test:
movl 4(%esp), %eax
xorl $1, (%eax)
ret
instead of code like this:
_test:
movl 4(%esp), %ecx
xorl $1, (%ecx)
movl 4(%ecx), %edx
movl %edx, 4(%ecx)
ret
llvm-svn: 45762
2008-01-08 23:08:06 +00:00
Owen Anderson
3d5485728a
Rename registers that do not need copies.
...
llvm-svn: 45759
2008-01-08 21:54:52 +00:00
Owen Anderson
23abe71f4d
Actually insert copies now!
...
llvm-svn: 45738
2008-01-08 05:16:15 +00:00
Owen Anderson
6f06a8e8d2
Oops, missed one.
...
llvm-svn: 45719
2008-01-07 21:32:09 +00:00
Owen Anderson
692d2acef8
Make some predicates static.
...
llvm-svn: 45718
2008-01-07 21:30:40 +00:00
Gordon Henriksen
fb55daea95
Pruning includes.
...
llvm-svn: 45700
2008-01-07 13:30:38 +00:00
Chris Lattner
f4f5495b06
remove #includage
...
llvm-svn: 45697
2008-01-07 07:42:25 +00:00
Chris Lattner
f83aae613c
rename TargetInstrDescriptor -> TargetInstrDesc.
...
Make MachineInstr::getDesc return a reference instead
of a pointer, since it can never be null.
llvm-svn: 45695
2008-01-07 07:27:27 +00:00
Chris Lattner
e78ce25794
simplify some code.
...
llvm-svn: 45693
2008-01-07 06:47:00 +00:00
Chris Lattner
57e851edfe
Rename all the M_* flags to be namespace qualified enums, and switch
...
all clients over to using predicates instead of these flags directly.
These are now private values which are only to be used to statically
initialize the tables.
llvm-svn: 45692
2008-01-07 06:42:05 +00:00
Chris Lattner
c745aa59b3
add more and significantly better comments to the rest of the machineinstr
...
flags that can be set. Add predicates for the ones lacking it, and switch
some clients over to using the predicates instead of Flags directly.
llvm-svn: 45690
2008-01-07 06:21:53 +00:00
Chris Lattner
18038a0aac
simplify some code using new predicates
...
llvm-svn: 45689
2008-01-07 05:40:58 +00:00
Chris Lattner
9b987de2c5
rename hasVariableOperands() -> isVariadic(). Add some comments.
...
Evan, please review the comments I added to getNumDefs to make sure
that they are accurate, thx.
llvm-svn: 45687
2008-01-07 05:19:29 +00:00
Chris Lattner
9d38dfa4a5
Move a bunch more accessors from TargetInstrInfo to TargetInstrDescriptor
...
llvm-svn: 45680
2008-01-07 03:13:06 +00:00
Chris Lattner
96d0a93f8e
remove some uses of MachineOpCode, move getSchedClass
...
into TargetInstrDescriptor from TargetInstrInfo.
llvm-svn: 45678
2008-01-07 02:46:03 +00:00
Chris Lattner
93e1e6ee12
Add predicates methods to TargetOperandInfo, and switch all clients
...
over to using them, instead of diddling Flags directly. Change the
various flags from const variables to enums.
llvm-svn: 45677
2008-01-07 02:39:19 +00:00
Gordon Henriksen
edbfece273
Setting GlobalDirective in TargetAsmInfo by default rather than
...
providing a misleading facility. It's used once in the MIPS backend
and hardcoded as "\t.globl\t" everywhere else.
llvm-svn: 45676
2008-01-07 02:31:11 +00:00
Chris Lattner
f7f96d818f
Rename MachineInstr::getInstrDescriptor -> getDesc(), which reflects
...
that it is cheap and efficient to get.
Move a variety of predicates from TargetInstrInfo into
TargetInstrDescriptor, which makes it much easier to query a predicate
when you don't have TII around. Now you can use MI->getDesc()->isBranch()
instead of going through TII, and this is much more efficient anyway. Not
all of the predicates have been moved over yet.
Update old code that used MI->getInstrDescriptor()->Flags to use the
new predicates in many places.
llvm-svn: 45674
2008-01-07 01:56:04 +00:00
Owen Anderson
2e866e9cdf
Update CodeGen for MRegisterInfo --> TargetInstrInfo changes.
...
llvm-svn: 45673
2008-01-07 01:35:56 +00:00
Gordon Henriksen
759ed9d805
Ammending r45669 with a missing file.
...
llvm-svn: 45671
2008-01-07 01:33:09 +00:00
Gordon Henriksen
db4f51e1b9
With this patch, the LowerGC transformation becomes the
...
ShadowStackCollector, which additionally has reduced overhead with
no sacrifice in portability.
Considering a function @fun with 8 loop-local roots,
ShadowStackCollector introduces the following overhead
(x86):
; shadowstack prologue
movl L_llvm_gc_root_chain$non_lazy_ptr, %eax
movl (%eax), %ecx
movl $___gc_fun, 20(%esp)
movl $0, 24(%esp)
movl $0, 28(%esp)
movl $0, 32(%esp)
movl $0, 36(%esp)
movl $0, 40(%esp)
movl $0, 44(%esp)
movl $0, 48(%esp)
movl $0, 52(%esp)
movl %ecx, 16(%esp)
leal 16(%esp), %ecx
movl %ecx, (%eax)
; shadowstack loop overhead
(none)
; shadowstack epilogue
movl 48(%esp), %edx
movl %edx, (%ecx)
; shadowstack metadata
.align 3
___gc_fun: # __gc_fun
.long 8
.space 4
In comparison to LowerGC:
; lowergc prologue
movl L_llvm_gc_root_chain$non_lazy_ptr, %eax
movl (%eax), %ecx
movl %ecx, 48(%esp)
movl $8, 52(%esp)
movl $0, 60(%esp)
movl $0, 56(%esp)
movl $0, 68(%esp)
movl $0, 64(%esp)
movl $0, 76(%esp)
movl $0, 72(%esp)
movl $0, 84(%esp)
movl $0, 80(%esp)
movl $0, 92(%esp)
movl $0, 88(%esp)
movl $0, 100(%esp)
movl $0, 96(%esp)
movl $0, 108(%esp)
movl $0, 104(%esp)
movl $0, 116(%esp)
movl $0, 112(%esp)
; lowergc loop overhead
leal 44(%esp), %eax
movl %eax, 56(%esp)
leal 40(%esp), %eax
movl %eax, 64(%esp)
leal 36(%esp), %eax
movl %eax, 72(%esp)
leal 32(%esp), %eax
movl %eax, 80(%esp)
leal 28(%esp), %eax
movl %eax, 88(%esp)
leal 24(%esp), %eax
movl %eax, 96(%esp)
leal 20(%esp), %eax
movl %eax, 104(%esp)
leal 16(%esp), %eax
movl %eax, 112(%esp)
; lowergc epilogue
movl 48(%esp), %edx
movl %edx, (%ecx)
; lowergc metadata
(none)
llvm-svn: 45670
2008-01-07 01:30:53 +00:00
Gordon Henriksen
88a41c672b
Enabling the target-independent garbage collection infrastructure by hooking it
...
up to the various compiler pipelines.
This doesn't actually add support for any GC algorithms, which means it
temporarily breaks a few tests. To be fixed shortly.
llvm-svn: 45669
2008-01-07 01:30:38 +00:00
Chris Lattner
14310afe42
rename isLoad -> isSimpleLoad due to evan's desire to have such a predicate.
...
llvm-svn: 45667
2008-01-06 23:38:27 +00:00
Chris Lattner
5489888580
rename isStore -> mayStore to more accurately reflect what it captures.
...
llvm-svn: 45656
2008-01-06 08:36:04 +00:00
Duncan Sands
63b3355183
Remove an unused variable.
...
llvm-svn: 45655
2008-01-06 07:43:13 +00:00
Chris Lattner
60aa495a41
make this build with newer gcc's
...
llvm-svn: 45637
2008-01-05 23:29:51 +00:00
Nate Begeman
a6e9de35ae
If custom lowering of insert element fails, the result Val will be 0.
...
Don't overwrite a variable used by the fallthrough code path in this
case.
llvm-svn: 45630
2008-01-05 20:47:37 +00:00
Chris Lattner
9f51583a6a
Fix build issue on certain compilers.
...
llvm-svn: 45629
2008-01-05 20:15:42 +00:00
Chris Lattner
0d444b96ac
The current impl is really trivial, add some comments about how it can be made better.
...
llvm-svn: 45625
2008-01-05 06:47:58 +00:00
Chris Lattner
9428a7d97f
allow sinking to be enabled for the jit
...
llvm-svn: 45624
2008-01-05 06:14:16 +00:00
Chris Lattner
9e7943159e
don't sink anything with side effects, this makes lots of stuff work, but sinks almost nothing.
...
llvm-svn: 45617
2008-01-05 02:33:22 +00:00
Chris Lattner
377c720459
fix a common crash.
...
llvm-svn: 45614
2008-01-05 01:39:17 +00:00
Owen Anderson
8c8c5906f8
I should not be allowed to commit when sleepy.
...
llvm-svn: 45608
2008-01-05 00:48:55 +00:00