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decode/arithmetic_half: Fix HADD2 and HMUL2 absolute and negation bits

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The encoding for negation and absolute value was wrong.
Extracting is now done manually. Similar instructions having different
encodings is the rule, not the exception. To keep sanity and readability
I preferred to extract the desired bit manually.

This is implemented against nxas:
8dbc389957/table.h (L68)

That is itself tested against nvdisasm (Nvidia's official disassembler).
This commit is contained in:
ReinUsesLisp 2020-04-20 03:24:00 -03:00
parent 3fa8a21647
commit 3e808936a8
2 changed files with 37 additions and 16 deletions
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2
src/video_core/engines/shader_bytecode.h
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@ -817,11 +817,9 @@ union Instruction {
BitField<32, 1, u64> saturate;
BitField<49, 2, HalfMerge> merge;
BitField<43, 1, u64> negate_a;
BitField<44, 1, u64> abs_a;
BitField<47, 2, HalfType> type_a;
BitField<31, 1, u64> negate_b;
BitField<30, 1, u64> abs_b;
BitField<28, 2, HalfType> type_b;