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357f5b0cc3
llvm-mirror/lib
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Craig Topper 357f5b0cc3 [X86] Add a DAG combine to transform (i8 (bitcast (v8i1 (extract_subvector (v16i1 X), 0)))) -> (i8 (trunc (i16 (bitcast (v16i1 X))))) on KNL target 
Without AVX512DQ we don't have KMOVB so we can't really copy 8-bits of a k-register to a GPR. We have to copy 16 bits instead. We do this even if the DAG copy is from v8i1->v16i1. If we detect the (i8 (bitcast (v8i1 (extract_subvector (v16i1 X), 0)))) we should rewrite the types to match the copy we do support. By doing this, we can help known bits to propagate without losing the upper 8 bits of the input to the extract_subvector. This allows some zero extends to be removed since we have an isel pattern to use kmovw for (zero_extend (i16 (bitcast (v16i1 X))).

Differential Revision: https://reviews.llvm.org/D66489

llvm-svn: 369434
2019-08-20 20:20:04 +00:00
..
Analysis [CaptureTracker] Let subclasses provide dereferenceability information 2019-08-19 21:56:38 +00:00
AsmParser [llvm] Migrate llvm::make_unique to std::make_unique 2019-08-15 15:54:37 +00:00
BinaryFormat [Dwarf] Complete the list of type tags. 2019-08-13 17:00:54 +00:00
Bitcode [llvm] Migrate llvm::make_unique to std::make_unique 2019-08-15 15:54:37 +00:00
Bitstream
CodeGen [GlobalISel] Handle multiple registers in dbg.value intrinsic 2019-08-20 16:28:37 +00:00
DebugInfo [DWARF] Fix reading 64-bit DWARF type units. 2019-08-20 12:52:32 +00:00
Demangle
ExecutionEngine [cmake] Link in LLVMPasses due to dependency by LLVMOrcJIT; NFC 2019-08-19 23:12:48 +00:00
Fuzzer
FuzzMutate [llvm] Migrate llvm::make_unique to std::make_unique 2019-08-15 15:54:37 +00:00
IR Link libpthread into LLVMCore.so 2019-08-15 18:06:30 +00:00
IRReader
LineEditor
Linker Linker: Add support for GlobalIFunc. 2019-08-08 22:09:18 +00:00
LTO [NewPM][PassInstrumentation] IR printing support for (Thin)LTO 2019-08-15 17:47:44 +00:00
MC [WebAssembly][lld] Fix crash when applying relocations to debug sections 2019-08-20 18:39:24 +00:00
MCA [llvm] Migrate llvm::make_unique to std::make_unique 2019-08-15 15:54:37 +00:00
Object [yaml2obj/obj2yaml][MachO] Allow setting custom section data 2019-08-20 08:49:07 +00:00
ObjectYAML [yaml2obj/obj2yaml][MachO] Allow setting custom section data 2019-08-20 08:49:07 +00:00
Option [llvm] Migrate llvm::make_unique to std::make_unique 2019-08-15 15:54:37 +00:00
Passes Title: Loop Cache Analysis 2019-08-09 13:56:29 +00:00
ProfileData [llvm] Migrate llvm::make_unique to std::make_unique 2019-08-15 15:54:37 +00:00
Remarks [llvm] Migrate llvm::make_unique to std::make_unique 2019-08-15 15:54:37 +00:00
Support Recommit "MemoryBuffer: Add a missing error-check to getOpenFileImpl" 2019-08-20 12:08:52 +00:00
TableGen [llvm] Migrate llvm::make_unique to std::make_unique 2019-08-15 15:54:37 +00:00
Target [X86] Add a DAG combine to transform (i8 (bitcast (v8i1 (extract_subvector (v16i1 X), 0)))) -> (i8 (trunc (i16 (bitcast (v16i1 X))))) on KNL target 2019-08-20 20:20:04 +00:00
Testing
TextAPI [TextAPI] Update reader to be supported by lib/Object 2019-08-16 15:30:48 +00:00
ToolDrivers
Transforms [InstCombine] add helper function for icmp+zext/sext; NFC 2019-08-20 18:15:17 +00:00
WindowsManifest [llvm] Migrate llvm::make_unique to std::make_unique 2019-08-15 15:54:37 +00:00
XRay [llvm] Migrate llvm::make_unique to std::make_unique 2019-08-15 15:54:37 +00:00
CMakeLists.txt
LLVMBuild.txt