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Implement VCNT instruction (#1963)

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* Implement VCNT based on AArch64 CNT

Add tests

* Update PTC version

* Address LDj's comments

* Explicit size in encoding
* Tighter tests
* Replace SoftFallback with IR helper

Co-authored-by: LDj3SNuD <35856442+LDj3SNuD@users.noreply.github.com>

* Reduce one BitwiseAnd from IR fallback

Based on popcount64b from https://en.wikipedia.org/wiki/Hamming_weight#Efficient_implementation

* Rename parameter and add assert

Co-authored-by: LDj3SNuD <35856442+LDj3SNuD@users.noreply.github.com>

Co-authored-by: LDj3SNuD <35856442+LDj3SNuD@users.noreply.github.com>
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mageven 2021-02-22 20:56:13 +05:30 • committed by GitHub
parent dc0adb533d
commit 9bda7b4699
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9 changed files with 81 additions and 11 deletions
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ARMeilleure/Decoders/OpCodeTable.cs
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@ -814,6 +814,7 @@ namespace ARMeilleure.Decoders
SetA32("111100111x11xx01xxxx0x100xx0xxxx", InstName.Vclt, InstEmit32.Vclt_Z, OpCode32SimdCmpZ.Create);
SetA32("<<<<11101x11010xxxxx101x01x0xxxx", InstName.Vcmp, InstEmit32.Vcmp, OpCode32SimdS.Create);
SetA32("<<<<11101x11010xxxxx101x11x0xxxx", InstName.Vcmpe, InstEmit32.Vcmpe, OpCode32SimdS.Create);
SetA32("111100111x110000xxxx01010xx0xxxx", InstName.Vcnt, InstEmit32.Vcnt, OpCode32SimdCmpZ.Create);
SetA32("<<<<11101x110111xxxx101x11x0xxxx", InstName.Vcvt, InstEmit32.Vcvt_FD, OpCode32SimdS.Create); // FP 32 and 64, scalar.
SetA32("<<<<11101x11110xxxxx101x11x0xxxx", InstName.Vcvt, InstEmit32.Vcvt_FI, OpCode32SimdCvtFI.Create); // FP32 to int.
SetA32("<<<<11101x111000xxxx101xx1x0xxxx", InstName.Vcvt, InstEmit32.Vcvt_FI, OpCode32SimdCvtFI.Create); // Int to FP32.