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archived-llvm/test/Transforms/LoopStrengthReduce
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Max Kazantsev b074309e70 [LSR] Fix Shadow IV in case of integer overflow 
When LSR processes code like

  int accumulator = 0;
  for (int i = 0; i < N; i++) {
    accummulator += i;
    use((double) accummulator);
  }

It may decide to replace integer `accumulator` with a double Shadow IV to get rid
of casts.  The problem with that is that the `accumulator`'s value may overflow.
Starting from this moment, the behavior of integer and double accumulators
will differ.

This patch strenghtens up the conditions of Shadow IV mechanism applicability.
We only allow it for IVs that are proved to be `AddRec`s with `nsw`/`nuw` flag.

Differential Revision: https://reviews.llvm.org/D37209


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@311986 91177308-0d34-0410-b5e6-96231b3b80d8
2017-08-29 07:32:20 +00:00
..
AArch64
Reapply [LSR] Create fewer redundant instructions.
2016-06-06 19:10:46 +00:00
AMDGPU
AMDGPU: Mark all unspecified CC functions in tests as amdgpu_kernel
2017-03-21 21:39:51 +00:00
ARM
ARM: handle post-indexed NEON ops where the offset isn't the access width.
2017-04-20 19:54:02 +00:00
NVPTX
[NVPTX] truncating 64-bit to 32-bit is free
2015-08-20 20:59:02 +00:00
X86
[LSR] Fix Shadow IV in case of integer overflow
2017-08-29 07:32:20 +00:00
2005-08-15-AddRecIV.ll
[opaque pointer type] Add textual IR support for explicit type parameter to load instruction
2015-02-27 21:17:42 +00:00
2005-08-17-OutOfLoopVariant.ll
[opaque pointer type] Add textual IR support for explicit type parameter to load instruction
2015-02-27 21:17:42 +00:00
2005-09-12-UsesOutOutsideOfLoop.ll
…
2007-04-23-UseIterator.ll
[opaque pointer type] Add textual IR support for explicit type parameter to getelementptr instruction
2015-02-27 19:29:02 +00:00
2008-08-13-CmpStride.ll
[opaque pointer type] Add textual IR support for explicit type parameter to the call instruction
2015-04-16 23:24:18 +00:00
2008-09-09-Overflow.ll
[opaque pointer type] Add textual IR support for explicit type parameter to the call instruction
2015-04-16 23:24:18 +00:00
2009-01-13-nonconstant-stride-outside-loop.ll
[opaque pointer type] Add textual IR support for explicit type parameter to the call instruction
2015-04-16 23:24:18 +00:00
2009-04-28-no-reduce-mul.ll
[opaque pointer type] Add textual IR support for explicit type parameter to gep operator
2015-03-13 18:20:45 +00:00
2011-07-19-CritEdgeBreakCrash.ll
[opaque pointer type] Add textual IR support for explicit type parameter to load instruction
2015-02-27 21:17:42 +00:00
2011-10-03-CritEdgeMerge.ll
Make DataLayout Non-Optional in the Module
2015-03-04 18:43:29 +00:00
2011-10-06-ReusePhi.ll
[LSR] canonicalize Prod*(1<<C) to Prod<<C
2015-06-24 19:28:40 +00:00
2011-10-13-SCEVChain.ll
[opaque pointer type] Add textual IR support for explicit type parameter to getelementptr instruction
2015-02-27 19:29:02 +00:00
2011-10-14-IntPtr.ll
[opaque pointer type] Add textual IR support for explicit type parameter to getelementptr instruction
2015-02-27 19:29:02 +00:00
2011-12-19-PostincQuadratic.ll
[opaque pointer type] Add textual IR support for explicit type parameter to load instruction
2015-02-27 21:17:42 +00:00
2012-01-02-nopreheader.ll
[opaque pointer type] Add textual IR support for explicit type parameter to getelementptr instruction
2015-02-27 19:29:02 +00:00
2012-01-16-nopreheader.ll
[opaque pointer type] Add textual IR support for explicit type parameter to getelementptr instruction
2015-02-27 19:29:02 +00:00
2012-03-15-nopreheader.ll
[opaque pointer type] Add textual IR support for explicit type parameter to load instruction
2015-02-27 21:17:42 +00:00
2012-03-26-constexpr.ll
[opaque pointer type] Add textual IR support for explicit type parameter to load instruction
2015-02-27 21:17:42 +00:00
2012-07-13-ExpandUDiv.ll
[opaque pointer type] Add textual IR support for explicit type parameter to load instruction
2015-02-27 21:17:42 +00:00
2012-07-18-LimitReassociate.ll
[opaque pointer type] Add textual IR support for explicit type parameter to the call instruction
2015-04-16 23:24:18 +00:00
2013-01-05-IndBr.ll
Update Transforms tests to use CHECK-LABEL for easier debugging. No functionality change.
2013-07-14 01:42:54 +00:00
2013-01-14-ReuseCast.ll
[LSR] Narrow search space by filtering non-optimal formulae with the same ScaledReg and Scale.
2017-07-06 15:52:14 +00:00
addrec-gep-address-space.ll
[opaque pointer type] Add textual IR support for explicit type parameter to load instruction
2015-02-27 21:17:42 +00:00
addrec-gep.ll
[opaque pointer type] Add textual IR support for explicit type parameter to load instruction
2015-02-27 21:17:42 +00:00
address-space-loop.ll
[opaque pointer type] Add textual IR support for explicit type parameter to load instruction
2015-02-27 21:17:42 +00:00
count-to-zero.ll
Make DataLayout Non-Optional in the Module
2015-03-04 18:43:29 +00:00
dead-phi.ll
…
different-type-ivs.ll
[opaque pointer type] Add textual IR support for explicit type parameter to the call instruction
2015-04-16 23:24:18 +00:00
dominate-assert.ll
Move the personality function from LandingPadInst to Function
2015-06-17 20:52:32 +00:00
dont_insert_redundant_ops.ll
[opaque pointer type] Add textual IR support for explicit type parameter to getelementptr instruction
2015-02-27 19:29:02 +00:00
dont_reduce_bytes.ll
[opaque pointer type] Add textual IR support for explicit type parameter to getelementptr instruction
2015-02-27 19:29:02 +00:00
dont_reverse.ll
Make DataLayout Non-Optional in the Module
2015-03-04 18:43:29 +00:00
dont-hoist-simple-loop-constants.ll
[opaque pointer type] Add textual IR support for explicit type parameter to getelementptr instruction
2015-02-27 19:29:02 +00:00
ephemeral.ll
[LSR] don't attempt to promote ephemeral values to indvars
2015-07-13 03:28:53 +00:00
exit_compare_live_range.ll
Tests: rewrite 'opt ... %s' to 'opt ... < %s' so that opt does not emit a ModuleID
2012-12-30 01:28:40 +00:00
funclet.ll
[LoopStrengthReduce] Don't rewrite PHIs with incoming values from CatchSwitches
2016-02-03 21:30:34 +00:00
hoist-parent-preheader.ll
[opaque pointer type] Add textual IR support for explicit type parameter to getelementptr instruction
2015-02-27 19:29:02 +00:00
illegal-addr-modes.ll
[ARM, Thumb1] Prevent ARMTargetLowering::isLegalAddressingMode from accepting illegal modes
2017-08-24 10:00:25 +00:00
invariant_value_first_arg.ll
[opaque pointer type] Add textual IR support for explicit type parameter to getelementptr instruction
2015-02-27 19:29:02 +00:00
invariant_value_first.ll
[opaque pointer type] Add textual IR support for explicit type parameter to getelementptr instruction
2015-02-27 19:29:02 +00:00
ivchain.ll
[PM] Convert Loop Strength Reduce pass to new PM
2016-07-18 21:41:50 +00:00
negative-scale.ll
[NoTTI] reject negative scale in addressing mode
2015-05-08 18:07:24 +00:00
nested-reduce.ll
Make DataLayout Non-Optional in the Module
2015-03-04 18:43:29 +00:00
nonintegral.ll
[SCEVExpander] Try harder to avoid introducing inttoptr
2017-05-27 03:22:55 +00:00
nonlinear-postinc.ll
Non-affine post-inc SCEV expansions have more code which must be
2010-03-02 01:59:21 +00:00
ops_after_indvar.ll
[opaque pointer type] Add textual IR support for explicit type parameter to getelementptr instruction
2015-02-27 19:29:02 +00:00
phi_node_update_multiple_preds.ll
[opaque pointer type] Add textual IR support for explicit type parameter to getelementptr instruction
2015-02-27 19:29:02 +00:00
post-inc-icmpzero.ll
Re-enable "[SCEV] Do not fold dominated SCEVUnknown into AddRecExpr start"
2017-05-26 06:47:04 +00:00
post-inc-optsize.ll
[LSR] Don't try and create post-inc expressions on non-rotated loops
2016-08-15 07:53:03 +00:00
pr2537.ll
add newlines at the end of files.
2010-04-07 22:53:17 +00:00
pr2570.ll
[opaque pointer type] Add textual IR support for explicit type parameter to load instruction
2015-02-27 21:17:42 +00:00
pr3086.ll
[opaque pointer type] Add textual IR support for explicit type parameter to load instruction
2015-02-27 21:17:42 +00:00
pr3399.ll
[opaque pointer type] Add textual IR support for explicit type parameter to load instruction
2015-02-27 21:17:42 +00:00
pr3571.ll
[opaque pointer type] Add textual IR support for explicit type parameter to load instruction
2015-02-27 21:17:42 +00:00
pr12018.ll
Remove the obsolete offset parameter from @llvm.dbg.value
2017-07-28 20:21:02 +00:00
pr12048.ll
[opaque pointer type] Add textual IR support for explicit type parameter to getelementptr instruction
2015-02-27 19:29:02 +00:00
pr12691.ll
Make DataLayout Non-Optional in the Module
2015-03-04 18:43:29 +00:00
pr18165.ll
[opaque pointer type] Add textual IR support for explicit type parameter to the call instruction
2015-04-16 23:24:18 +00:00
pr25541.ll
[IR] Reformulate LLVM's EH funclet IR
2015-12-12 05:38:55 +00:00
pr27056.ll
Fix PR33514
2017-08-04 18:46:13 +00:00
pr31627.ll
[LoopStrengthReduce] Don't bother rewriting PHIs in catchswitch blocks
2017-01-13 22:24:27 +00:00
preserve-gep-loop-variant.ll
[opaque pointer type] Add textual IR support for explicit type parameter to getelementptr instruction
2015-02-27 19:29:02 +00:00
related_indvars.ll
[opaque pointer type] Add textual IR support for explicit type parameter to getelementptr instruction
2015-02-27 19:29:02 +00:00
remove_indvar.ll
Make DataLayout Non-Optional in the Module
2015-03-04 18:43:29 +00:00
scaling_factor_cost_crash.ll
[opaque pointer type] Add textual IR support for explicit type parameter to getelementptr instruction
2015-02-27 19:29:02 +00:00
scev-insertpt-bug.ll
Reapply [LSR] Create fewer redundant instructions.
2016-06-06 19:10:46 +00:00
sext-ind-var.ll
[SCEV] Preserve NSW information for sext(subtract).
2017-08-04 20:19:46 +00:00
share_code_in_preheader.ll
[opaque pointer type] Add textual IR support for explicit type parameter to load instruction
2015-02-27 21:17:42 +00:00
share_ivs.ll
…
shl.ll
[LSR] canonicalize Prod*(1<<C) to Prod<<C
2015-06-24 19:28:40 +00:00
uglygep-address-space.ll
[opaque pointer type] Add textual IR support for explicit type parameter to load instruction
2015-02-27 21:17:42 +00:00
uglygep.ll
[opaque pointer type] Add textual IR support for explicit type parameter to load instruction
2015-02-27 21:17:42 +00:00
use_postinc_value_outside_loop.ll
[opaque pointer type] Add textual IR support for explicit type parameter to getelementptr instruction
2015-02-27 19:29:02 +00:00
var_stride_used_by_compare.ll
[opaque pointer type] Add textual IR support for explicit type parameter to getelementptr instruction
2015-02-27 19:29:02 +00:00
variable_stride.ll
Make DataLayout Non-Optional in the Module
2015-03-04 18:43:29 +00:00