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shader_recompiler: Fix buffer atomic bounds check.

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This commit is contained in:
squidbus 2025-02-15 20:43:52 -08:00
parent 7c3c0183e9
commit e7906f603e
1 changed files with 25 additions and 8 deletions
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33
src/shader_recompiler/backend/spirv/emit_spirv_atomic.cpp
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@ -21,6 +21,28 @@ Id SharedAtomicU32(EmitContext& ctx, Id offset, Id value,
return (ctx.*atomic_func)(ctx.U32[1], pointer, scope, semantics, value);
}
Id BufferAtomicU32BoundsCheck(EmitContext& ctx, Id index, Id buffer_size, auto emit_func) {
if (Sirit::ValidId(buffer_size)) {
// Bounds checking enabled, wrap in a conditional branch to make sure that
// the atomic is not mistakenly executed when the index is out of bounds.
const Id in_bounds = ctx.OpULessThan(ctx.U1[1], index, buffer_size);
const Id ib_label = ctx.OpLabel();
const Id oob_label = ctx.OpLabel();
const Id end_label = ctx.OpLabel();
ctx.OpBranchConditional(in_bounds, ib_label, oob_label);
ctx.AddLabel(ib_label);
const Id ib_result = emit_func();
ctx.OpBranch(end_label);
ctx.AddLabel(oob_label);
const Id oob_result = ctx.u32_zero_value;
ctx.OpBranch(end_label);
ctx.AddLabel(end_label);
return ctx.OpPhi(ctx.U32[1], ib_result, ib_label, oob_result, oob_label);
}
// Bounds checking not enabled, just perform the atomic operation.
return emit_func();
}
Id BufferAtomicU32(EmitContext& ctx, IR::Inst* inst, u32 handle, Id address, Id value,
Id (Sirit::Module::*atomic_func)(Id, Id, Id, Id, Id)) {
const auto& buffer = ctx.buffers[handle];
@ -31,14 +53,9 @@ Id BufferAtomicU32(EmitContext& ctx, IR::Inst* inst, u32 handle, Id address, Id
const auto [id, pointer_type] = buffer[EmitContext::BufferAlias::U32];
const Id ptr = ctx.OpAccessChain(pointer_type, id, ctx.u32_zero_value, index);
const auto [scope, semantics]{AtomicArgs(ctx)};
const Id result = (ctx.*atomic_func)(ctx.U32[1], ptr, scope, semantics, value);
if (Sirit::ValidId(buffer.size_dwords)) {
const Id in_bounds = ctx.OpULessThan(ctx.U1[1], index, buffer.size_dwords);
return ctx.OpSelect(ctx.U32[1], in_bounds, result, ctx.u32_zero_value);
} else {
return result;
}
return BufferAtomicU32BoundsCheck(ctx, index, buffer.size_dwords, [&] {
return (ctx.*atomic_func)(ctx.U32[1], ptr, scope, semantics, value);
});
}
Id ImageAtomicU32(EmitContext& ctx, IR::Inst* inst, u32 handle, Id coords, Id value,