Commit Graph

30 Commits

Author SHA1 Message Date
Richard Sandiford
2e015ef9bb [SystemZ] Use MVC for simple load/store pairs
Look for patterns of the form (store (load ...), ...) in which the two
locations are known not to partially overlap.  (Identical locations are OK.)
These sequences are better implemented by MVC unless either the load or
the store could use RELATIVE LONG instructions.

The testcase showed that we weren't using LHRL and LGHRL for extload16,
only sextloadi16.  The patch fixes that too.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185919 91177308-0d34-0410-b5e6-96231b3b80d8
2013-07-09 09:46:39 +00:00
Richard Sandiford
fa487e83a8 [SystemZ] Fold more spills
Add a mapping from register-based <INSN>R instructions to the corresponding
memory-based <INSN>.  Use it to cut down on the number of spill loads.

Some instructions extend their operands from smaller fields, so this
required a new TSFlags field to say how big the unextended operand is.

This optimisation doesn't trigger for C(G)R and CL(G)R because in practice
we always combine those instructions with a branch.  Adding a test for every
other case probably seems excessive, but it did catch a missed optimisation
for DSGF (fixed in r185435).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185529 91177308-0d34-0410-b5e6-96231b3b80d8
2013-07-03 10:10:02 +00:00
Richard Sandiford
722e9e6d0a [SystemZ] Add conditional store patterns
Add pseudo conditional store instructions, so that we use:

    branch foo:
    store
foo:

instead of:

    load
    branch foo:
    move
foo:
    store

z196 has real 32-bit and 64-bit conditional stores, but we don't use
any z196 instructions yet.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185065 91177308-0d34-0410-b5e6-96231b3b80d8
2013-06-27 09:27:40 +00:00
Richard Sandiford
dbd8eb26ce [SystemZ] Rename PSW to CC
Addresses a review comment from Ulrich Weigand.  No functional change intended.

I'm not sure whether the old TODO that this patch touches still holds,
but that's something we'd get to when adding a targetted scheduling
description.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@182474 91177308-0d34-0410-b5e6-96231b3b80d8
2013-05-22 13:38:45 +00:00
Richard Sandiford
055ac429cc [SystemZ] Match operands to fields by name rather than by order
The SystemZ port currently relies on the order of the instruction operands
matching the order of the instruction field lists.  This isn't desirable
for disassembly, where the two are matched only by name.  E.g. the R1 and R2
fields of an RR instruction should have corresponding R1 and R2 operands.

The main complication is that addresses are compound operands,
and as far as I know there is no mechanism to allow individual
suboperands to be selected by name in "let Inst{...} = ..." assignments.
Luckily it doesn't really matter though.  The SystemZ instruction
encoding groups all address fields together in a predictable order,
so it's just as valid to see the entire compound address operand as
a single field.  That's the approach taken in this patch.

Matching by name in turn means that the operands to COPY SIGN and
CONVERT TO FIXED instructions can be given in natural order.
(It was easier to do this at the same time as the rename,
since otherwise the intermediate step was too confusing.)

No functional change intended.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@181769 91177308-0d34-0410-b5e6-96231b3b80d8
2013-05-14 09:28:21 +00:00
Ulrich Weigand
1d09d56fe1 [SystemZ] Add back end
This adds the actual lib/Target/SystemZ target files necessary to
implement the SystemZ target.  Note that at this point, the target
cannot yet be built since the configure bits are missing.  Those
will be provided shortly by a follow-on patch.

This version of the patch incorporates feedback from reviews by
Chris Lattner and Anton Korobeynikov.  Thanks to all reviewers!

Patch by Richard Sandiford.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@181203 91177308-0d34-0410-b5e6-96231b3b80d8
2013-05-06 16:15:19 +00:00
Dan Gohman
29074ccf6c Remove the SystemZ backend.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142878 91177308-0d34-0410-b5e6-96231b3b80d8
2011-10-24 23:48:32 +00:00
Eric Christopher
be4e066ff9 Remove isTwoAddress from SystemZ.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106467 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-21 20:25:57 +00:00
Chris Lattner
a591ff53d9 Improve systemz to model cmp and ucmp nodes as returning
their flags correctly.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@99738 91177308-0d34-0410-b5e6-96231b3b80d8
2010-03-28 05:21:52 +00:00
Dan Gohman
bc9d98b52d The mayHaveSideEffects flag is no longer used.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97348 91177308-0d34-0410-b5e6-96231b3b80d8
2010-02-27 23:47:46 +00:00
Dan Gohman
533297b58d Rename usesCustomDAGSchedInserter to usesCustomInserter, and update a
bunch of associated comments, because it doesn't have anything to do
with DAGs or scheduling. This is another step in decoupling MachineInstr
emitting from scheduling.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85517 91177308-0d34-0410-b5e6-96231b3b80d8
2009-10-29 18:10:34 +00:00
Dan Gohman
aa123224c4 Update SystemZ to use PSW following the way x86 uses EFLAGS. Besides
eliminating a use of MVT::Flag, this is needed for an upcoming CodeGen
change.

This unfortunately requires SystemZ to switch to the list-burr
scheduler, in order to handle the physreg defs properly, however
that's what LLVM has available at this time.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85357 91177308-0d34-0410-b5e6-96231b3b80d8
2009-10-28 00:55:57 +00:00
Anton Korobeynikov
162da3c7b4 Add fcopysign instructions
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79664 91177308-0d34-0410-b5e6-96231b3b80d8
2009-08-21 20:02:37 +00:00
Anton Korobeynikov
74e2dc446c All FP instructions have 12 bit memory displacement field
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76058 91177308-0d34-0410-b5e6-96231b3b80d8
2009-07-16 14:33:27 +00:00
Anton Korobeynikov
8b75813687 Fix instruction mnemonics for some fp_to_sint operations
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76048 91177308-0d34-0410-b5e6-96231b3b80d8
2009-07-16 14:29:26 +00:00
Anton Korobeynikov
05a0b8bc66 Handle bitconverts
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76042 91177308-0d34-0410-b5e6-96231b3b80d8
2009-07-16 14:27:01 +00:00
Anton Korobeynikov
4971e1ebb7 Emit proper rounding mode for fp_to_sint
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76037 91177308-0d34-0410-b5e6-96231b3b80d8
2009-07-16 14:25:12 +00:00
Anton Korobeynikov
1ada84daaf Make FP zero to be legal FP immediate via LOAD ZERO
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76034 91177308-0d34-0410-b5e6-96231b3b80d8
2009-07-16 14:24:16 +00:00
Anton Korobeynikov
5753f47f5b Loads are not two-address in any way
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76033 91177308-0d34-0410-b5e6-96231b3b80d8
2009-07-16 14:24:01 +00:00
Anton Korobeynikov
a61a4f669b Add LOAD NEGATIVE instruction
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76032 91177308-0d34-0410-b5e6-96231b3b80d8
2009-07-16 14:23:44 +00:00
Anton Korobeynikov
03f60001df LOAD COMPLEMENT instruction is not really two-addr
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76031 91177308-0d34-0410-b5e6-96231b3b80d8
2009-07-16 14:23:30 +00:00
Anton Korobeynikov
6495063386 Add multiple add/sub instructions
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76030 91177308-0d34-0410-b5e6-96231b3b80d8
2009-07-16 14:23:16 +00:00
Anton Korobeynikov
85c5c3f138 Proper FP extloads
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76028 91177308-0d34-0410-b5e6-96231b3b80d8
2009-07-16 14:22:46 +00:00
Anton Korobeynikov
299dc78d67 Add proper PWS impdef's
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76027 91177308-0d34-0410-b5e6-96231b3b80d8
2009-07-16 14:22:30 +00:00
Anton Korobeynikov
da723d7d91 Propagate FP select_cc to dag inserters
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76026 91177308-0d34-0410-b5e6-96231b3b80d8
2009-07-16 14:22:15 +00:00
Anton Korobeynikov
55e96fb1c6 Implement fp_to_sint
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76025 91177308-0d34-0410-b5e6-96231b3b80d8
2009-07-16 14:21:57 +00:00
Anton Korobeynikov
c79465df08 Add fabs
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76023 91177308-0d34-0410-b5e6-96231b3b80d8
2009-07-16 14:21:27 +00:00
Anton Korobeynikov
f1e82ce480 Add fneg
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76022 91177308-0d34-0410-b5e6-96231b3b80d8
2009-07-16 14:21:12 +00:00
Anton Korobeynikov
1d0ec0b4fc More sint_to_fp stuff
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76020 91177308-0d34-0410-b5e6-96231b3b80d8
2009-07-16 14:20:39 +00:00
Anton Korobeynikov
7aa03ac827 Add bunch of FP instructions
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76019 91177308-0d34-0410-b5e6-96231b3b80d8
2009-07-16 14:20:24 +00:00