Craig Topper 1ecdae15ce [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

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@369434 91177308-0d34-0410-b5e6-96231b3b80d8

2019-08-20 20:20:04 +00:00

..

AArch64

MemTag: stack initializer merging.

2019-08-19 20:47:09 +00:00

AMDGPU

Revert "AMDGPU: Fix iterator error when lowering SI_END_CF"

2019-08-20 17:45:25 +00:00

ARC

[lit] Delete empty lines at the end of lit.local.cfg NFC

2019-06-17 09:51:07 +00:00

ARM

Reland "[ARM] push LR before __gnu_mcount_nc"

2019-08-16 23:30:16 +00:00

AVR

[AVR] Fix tests after r363757

2019-07-04 06:12:47 +00:00

BPF

[BPF] Fix bpf llvm-objdump issues.

2019-08-17 22:12:00 +00:00

Generic

[GlobalISel] Handle multiple registers in dbg.value intrinsic

2019-08-20 16:28:37 +00:00

Hexagon

[CodeGen] Add EarlyIfConvert test missed in previous commit

2019-08-20 16:34:47 +00:00

Inputs

[CodeGen] Add stack protector tests where the guard gets re-assigned

2019-07-17 20:46:16 +00:00

Lanai

[SDAG] commute setcc operands to match a subtract

2019-07-10 23:23:54 +00:00

Mips

[mips] Remove redundant case in the test. NFC

2019-08-14 16:27:07 +00:00

MIR

[DebugInfo] Allow bundled calls in the MIR's call site info

2019-08-19 12:41:22 +00:00

MSP430

[lit] Delete empty lines at the end of lit.local.cfg NFC

2019-06-17 09:51:07 +00:00

NVPTX

[NVPTX] Fix PR41651

2019-07-30 19:52:01 +00:00

PowerPC

[PeepholeOptimizer] Don't assume bitcast def always has input

2019-08-19 14:19:04 +00:00

RISCV

[RISCV] Lower inline asm constraint A for RISC-V

2019-08-16 10:28:34 +00:00

SPARC

[lit] Delete empty lines at the end of lit.local.cfg NFC

2019-06-17 09:51:07 +00:00

SystemZ

[SystemZ] Regenerate <8 x i31> store test

2019-07-29 09:49:23 +00:00

Thumb

Revert r368339 "[MBP] Disable aggressive loop rotate in plain mode"

2019-08-12 14:23:13 +00:00

Thumb2

[ARM] Select vaddva

2019-08-20 16:33:34 +00:00

WebAssembly

Revert r368276 "[TargetLowering] SimplifyDemandedBits - call SimplifyMultipleUseDemandedBits for ISD::EXTRACT_VECTOR_ELT"

2019-08-13 09:33:25 +00:00

WinCFGuard

…

WinEH

IR: print value numbers for unnamed function arguments

2019-08-03 14:28:34 +00:00

X86

[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

XCore

[lit] Delete empty lines at the end of lit.local.cfg NFC

2019-06-17 09:51:07 +00:00