clang-p2996

Files

Sanjay Patel 26725bdc50 [InstCombine] add folds for icmp with xor mask constant

These are the folds in Alive;
Name: xor_ult
Pre: isPowerOf2(-C1)
%xor = xor i8 %x, C1
%r = icmp ult i8 %xor, C1
=>
%r = icmp ugt i8 %x, ~C1

Name: xor_ugt
Pre: isPowerOf2(C1+1)
%xor = xor i8 %x, C1
%r = icmp ugt i8 %xor, C1
=>
%r = icmp ugt i8 %x, C1

https://rise4fun.com/Alive/Vty

The ugt case in its simplest form was already handled by DemandedBits,
but that's not ideal as shown in the multi-use test.

I'm not sure if these are all of the symmetrical folds, but I adjusted 
the existing code for one of the folds to try to show the similarities.

There's no obvious connection, but this is another preliminary step 
for PR14613...
https://bugs.llvm.org/show_bug.cgi?id=14613

llvm-svn: 341997

2018-09-11 22:00:15 +00:00

CMakeLists.txt

InstCombine/AMDGPU: Add dimension-aware image intrinsics to SimplifyDemanded

2018-06-21 13:37:31 +00:00

InstCombineAddSub.cpp

[InstCombine] Use dyn_cast instead of match(m_Constant). NFC

2018-09-11 16:51:26 +00:00

InstCombineAndOrXor.cpp

[InstCombine] Fold (min/max ~X, Y) -> ~(max/min X, ~Y) when Y is freely invertible

2018-09-07 16:19:50 +00:00

InstCombineCalls.cpp

[InstCombine] canonicalize fneg with llvm.sin