David Majnemer cd4fbcd1bb InstSimplify: Simplify (X - (0 - Y)) if the second sub is NUW ...

If the NUW bit is set for 0 - Y, we know that all values for Y other
than 0 would produce a poison value.  This allows us to replace (0 - Y)
with 0 in the expression (X - (0 - Y)) which will ultimately leave us
with X.

This partially fixes PR20189.

llvm-svn: 214384

2014-07-31 04:49:18 +00:00

..

2010-12-20-Boolean.ll

Update Transforms tests to use CHECK-LABEL for easier debugging. No functionality change.

2013-07-14 01:42:54 +00:00

2011-01-14-Thread.ll

Update Transforms tests to use CHECK-LABEL for easier debugging. No functionality change.

2013-07-14 01:42:54 +00:00

2011-02-01-Vector.ll

Update Transforms tests to use CHECK-LABEL for easier debugging. No functionality change.

2013-07-14 01:42:54 +00:00

2011-09-05-InsertExtractValue.ll

Update Transforms tests to use CHECK-LABEL for easier debugging. No functionality change.

2013-07-14 01:42:54 +00:00

2011-10-27-BinOpCrash.ll

Reapply commit 143028 with a fix: the problem was casting a ConstantExpr Mul

2011-10-27 19:16:21 +00:00

2011-11-23-MaskedBitsCrash.ll

Fix a crash in which a multiplication was being reported as being both negative

2011-11-23 16:26:47 +00:00

2013-04-19-ConstantFoldingCrash.ll

ConstantFolding: ComputeMaskedBits wants the scalar size for vectors.

2013-04-19 16:56:24 +00:00

AndOrXor.ll

InstSimplify: Simplify (X - (0 - Y)) if the second sub is NUW

2014-07-31 04:49:18 +00:00

apint-or.ll

Move optimization of some cases of (A & C1)|(B & C2) from instcombine to instsimplify. Patch by Rahul Jain, plus some last minute changes by me -- you can blame me for any bugs.

2014-06-19 03:51:46 +00:00

ashr-nop.ll

Move ashr optimization from InstCombineShift to InstSimplify.

2014-07-17 06:28:15 +00:00

assume.ll

Add @llvm.assume, lowering, and some basic properties

2014-07-25 21:13:35 +00:00

call-callconv.ll

[SimplifyLibCalls] Library call simplification doen't work if the call site

2013-02-08 18:00:14 +00:00

call.ll

Verify that we don't optimize null return checks to the nothrow_t version of operator new.

2013-09-24 18:37:49 +00:00

compare.ll

Add a dereferenceable attribute

2014-07-18 15:51:28 +00:00

dead-code-removal.ll

RecursivelyDeleteTriviallyDeadInstructions() could remove

2014-04-26 05:58:11 +00:00

exact-nsw-nuw.ll

Update Transforms tests to use CHECK-LABEL for easier debugging. No functionality change.

2013-07-14 01:42:54 +00:00

fast-math.ll

Update Transforms tests to use CHECK-LABEL for easier debugging. No functionality change.

2013-07-14 01:42:54 +00:00

fdiv.ll

Update Transforms tests to use CHECK-LABEL for easier debugging. No functionality change.

2013-07-14 01:42:54 +00:00

floating-point-arithmetic.ll

Update Transforms tests to use CHECK-LABEL for easier debugging. No functionality change.

2013-07-14 01:42:54 +00:00

maxmin.ll

Update Transforms tests to use CHECK-LABEL for easier debugging. No functionality change.

2013-07-14 01:42:54 +00:00

past-the-end.ll

Add a testcase for some past-the-end address subtleties.

2013-02-01 19:37:52 +00:00

phi.ll

Update Transforms tests to use CHECK-LABEL for easier debugging. No functionality change.

2013-07-14 01:42:54 +00:00

ptr_diff.ll

Update Transforms tests to use CHECK-LABEL for easier debugging. No functionality change.

2013-07-14 01:42:54 +00:00

reassociate.ll

Update Transforms tests to use CHECK-LABEL for easier debugging. No functionality change.

2013-07-14 01:42:54 +00:00

rem.ll

Update Transforms tests to use CHECK-LABEL for easier debugging. No functionality change.

2013-07-14 01:42:54 +00:00

undef.ll

InstSimplify: Make shift, select and GEP simplifications vector-aware.

2014-01-24 17:09:53 +00:00

vector_gep.ll

InstSimplify: Make shift, select and GEP simplifications vector-aware.

2014-01-24 17:09:53 +00:00