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7 Commits

Author SHA1 Message Date
Simon Pilgrim 1cdbfe44b1 [DAGCombiner] Add ComputeNumSignBits vector demanded elements support to ASHR and INSERT_VECTOR_ELT 
Followup to D31311

llvm-svn: 299221
 2017-03-31 14:21:50 +00:00
Simon Pilgrim c3e5c3c5bc [X86][SSE] Add extra computeNumSignBits test case for D31311. 
llvm-svn: 298774
 2017-03-25 15:43:36 +00:00
Simon Pilgrim 1c048ab6ba [X86][SSE] Extract elements from narrower shuffle masks. 
Add support for widening narrow shuffle masks so we can directly extract from the relevant input vector of the shuffle.

llvm-svn: 298616
 2017-03-23 16:09:34 +00:00
Simon Pilgrim d341290b5c [X86][SSE] Add computeNumSignBits test for sitofp of (extended) i64 extracted element 
llvm-svn: 298592
 2017-03-23 13:18:09 +00:00
Simon Pilgrim 128a10a41d [X86][SSE] Fix load folding for (V)CVTDQ2PD 
This only requires a 64-bit memory source, not the whole 128-bits. But the 128-bit case is still supported via X86InstrInfo::foldMemoryOperandImpl

llvm-svn: 297523
 2017-03-10 22:35:07 +00:00
Simon Pilgrim 7dedbfa89d [SelectionDAG] Add support for BUILD_VECTOR to ComputeNumSignBits 
llvm-svn: 297492
 2017-03-10 18:36:46 +00:00
Simon Pilgrim e54cd65399 [X86][SSE] Added tests showing missed truncations for sitofp conversion 
SelectionDAG::ComputeNumSignBits is poor at build_vector handling, meaning that we can't see that all the vXi64 sources are in fact sign extended i32 or smaller.

llvm-svn: 297486
 2017-03-10 18:01:53 +00:00