RFR: 8279651: [vectorapi] Implement the missing intrinsics for casting from integrals on x64 [v6]

[Vladimir Kozlov]

On Tue, 11 Jan 2022 13:40:54 GMT, Quan Anh Mai <duke at openjdk.java.net> wrote:

>> Hi,
>> 
>> This patch implements the remaining casts from integral types on x64.
>> 
>> Thank you very much.
>
> Quan Anh Mai has updated the pull request incrementally with two additional commits since the last revision:
> 
>  - Merge branch 'vLongToFD' of github.com:MeryKitty/jdk into vLongToFD
>  - use movmskpd instead of ptest

I got failure in next tests when run with `-XX:UseAVX=3 -XX:+UnlockDiagnosticVMOptions -XX:+UseKNLSetting`:

compiler/vectorapi/reshape/TestVectorCastAVX512.java
compiler/codegen/TestLongDoubleVect.java
jdk/incubator/vector/VectorMaxConversionTests.java
jdk/incubator/vector/Vector64ConversionTests.java#id0
jdk/incubator/vector/Vector128ConversionTests.java
jdk/incubator/vector/Vector256ConversionTests.java

#  Internal Error (/workspace/open/src/hotspot/cpu/x86/assembler_x86.cpp:2703), pid=31504, tid=31619
#  Error: assert(VM_Version::supports_avx512dq()) failed

Current CompileTask:
C2:   1647  456             jdk.incubator.vector.AbstractVector$$Lambda$147/0x0000000801087788::apply (15 bytes)

Stack: [0x00007f8fc59a7000,0x00007f8fc5aa8000],  sp=0x00007f8fc5aa2720,  free space=1005k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V  [libjvm.so+0x66a494]  Assembler::kortestbl(KRegisterImpl*, KRegisterImpl*)+0x134
V  [libjvm.so+0x8b3ba1]  C2_MacroAssembler::vector_castL2FD(XMMRegisterImpl*, XMMRegisterImpl*, XMMRegisterImpl*, XMMRegisterImpl*, RegisterImpl*, KRegisterImpl*, BasicType, int, int)+0x141
V  [libjvm.so+0x4316a0]  vcastLtoFD_evexNode::emit(CodeBuffer&, PhaseRegAlloc*) const+0x280
V  [libjvm.so+0x16484f8]  PhaseOutput::scratch_emit_size(Node const*)+0x438
V  [libjvm.so+0x163e968]  PhaseOutput::shorten_branches(unsigned int*)+0x2e8
V  [libjvm.so+0x165159a]  PhaseOutput::Output()+0xc6a
V  [libjvm.so+0xa93197]  Compile::Code_Gen()+0x427
V  [libjvm.so+0xa9f50e]  Compile::Compile(ciEnv*, ciMethod*, int, Options, DirectiveSet*)+0x166e

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PR: https://git.openjdk.java.net/jdk/pull/7002