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shader: support returning 32-bit LDS compare-exchange (DS_CMPST_RTN_B32) (#1578)

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* shader: support DS_CMPST_RTN_B32

Assassin's Creed Valhalla (PPSA01490, #281) stops on DS opcode 0x30 in a
compute shader. DS compares DATA and stores DATA2, the opposite of
BUFFER_ATOMIC_CMPSWAP, so the 32-bit atomic path swaps the two for this
opcode, as the 64-bit form does.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* shader: reject unsupported GDS compare-store variant

---------

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
Co-authored-by: nmzik <Nmzik@mail.ru>
This commit is contained in:
Nawid3333Claude Opus 5.5nmzik
 authored and GitHub committed 2026-10-17 04:37:16 +02:00
1 parent 0fd41ae206
commit e93b4b0378
10 files changed
+97 -3
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src/graphics/shader/recompiler/frontend/decode/ShaderDecoder.cpp
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@@ -718,6 +718,7 @@ std::string InstructionToString(const Instruction& inst) {
case Opcode::DS_MAX_U32:
case Opcode::DS_MAX_RTN_U32:
case Opcode::DS_MAX_RTN_U64:
case Opcode::DS_CMPST_RTN_B32:
case Opcode::DS_CMPST_RTN_B64:
case Opcode::DS_AND_B32:
case Opcode::DS_AND_RTN_B32: