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shader: support DS_READ_U16_D16_HI (#356)

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Decode the high-half D16 LDS read and route it through the existing unsigned-short load lowering. Represent the destination as a high-half partial write so the low 16 bits of the VGPR remain intact. Add captured-instruction decode coverage and a Vulkan execution regression that verifies the preserved half.

Co-authored-by: SueryRD <the.ai.tester2@gmail.com>
This commit is contained in:
GodsWill Dev
2026-08-29 02:39:45 -04:00
committed by GitHub
parent 715539804b
commit 18b6c9059b
5 changed files with 45 additions and 3 deletions
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tests/ShaderRecompilerComputeTests.cpp
+29
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@@ -12018,6 +12018,7 @@ CoverageClass ClassifyOpcode(ShaderOpcode opcode,
case Opcode::DS_READ_I16:
case Opcode::DS_READ_U16:
case Opcode::DS_READ_U16_D16:
case Opcode::DS_READ_U16_D16_HI:
case Opcode::DS_READ2_B32:
case Opcode::DS_READ_B32:
case Opcode::DS_READ_B64:
@@ -18038,6 +18039,33 @@ TestCase DsReadU16D16CapturedPreservesHighHalf() {
return test;
}
TestCase DsReadU16D16HiCapturedPreservesLowHalf() {
using O = ShaderOpcode;
std::vector<u32> code;
AppendVMovU32(&code, 1, 0);
AppendVMovLiteral(&code, 2, 0x89abcdefu);
code.push_back(EncodeDs0(0x0d));
code.push_back(EncodeDs1(0, 2, 1)); // ds_write_b32 v2, v1
AppendVMovLiteral(&code, 5, 0x12345678u);
AppendVMovU32(&code, 6, 0);
code.push_back(0xda9c0000u);
code.push_back(0x05000006u); // captured ds_read_u16_d16_hi v5, v6
AppendStoreVgpr(&code, 5, 0);
AppendEnd(&code);
TestCase test{"DsReadU16D16HiCapturedPreservesLowHalf",
code,
std::vector<u32>(1, 0),
{0xcdef5678u},
{O::V_MOV_B32, O::DS_WRITE_B32, O::DS_READ_U16_D16_HI,
O::BUFFER_STORE_DWORD, O::S_ENDPGM}};
test.decoded_counts = {{"DS_READ_U16_D16_HI", 1}};
return test;
}
TestCase DsReadWrite2Variants() {
using O = ShaderOpcode;
@@ -20556,6 +20584,7 @@ std::vector<TestCase> MakeCases() {
AddCase(FlatStoreVariants);
AddCase(DsReadWriteVariants);
AddCase(DsReadU16D16CapturedPreservesHighHalf);
AddCase(DsReadU16D16HiCapturedPreservesLowHalf);
AddCase(DsAppendConsumeUsesEncodedLdsSelector);
AddCase(DsAppendUsesEncodedGdsSelector);
AddCase(DsGdsSubdwordAndAtomicWrites);