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Use shift operations for dynamic bit extraction for better performance

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MaranBr 2026-04-02 14:53:58 +02:00 • committed by crueter
parent a8e40bac07
commit e6cd1033e9
1 changed files with 6 additions and 4 deletions
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10
src/shader_recompiler/backend/spirv/emit_spirv_image.cpp
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@ -285,11 +285,13 @@ Id IsScaled(EmitContext& ctx, const IR::Value& index, Id member_index, u32 base_
if (base_index != 0) { if (base_index != 0) {
index_value = ctx.OpIAdd(ctx.U32[1], index_value, ctx.Const(base_index)); index_value = ctx.OpIAdd(ctx.U32[1], index_value, ctx.Const(base_index));
} }
const Id word_index{ctx.OpUDiv(ctx.U32[1], index_value, ctx.Const(32u))}; const Id word_index{ctx.OpShiftRightLogical(ctx.U32[1], index_value, ctx.Const(5u))};
const Id pointer{ctx.OpAccessChain(push_constant_u32, ctx.rescaling_push_constants, member_index, word_index)};
const Id word{ctx.OpLoad(ctx.U32[1], pointer)};
const Id bit_index{ctx.OpBitwiseAnd(ctx.U32[1], index_value, ctx.Const(31u))}; const Id bit_index{ctx.OpBitwiseAnd(ctx.U32[1], index_value, ctx.Const(31u))};
bit = ctx.OpBitFieldUExtract(ctx.U32[1], word, bit_index, ctx.Const(1u)); const Id pointer{ctx.OpAccessChain(push_constant_u32, ctx.rescaling_push_constants,
member_index, word_index)};
const Id word{ctx.OpLoad(ctx.U32[1], pointer)};
const Id bit_index_mask{ctx.OpShiftLeft(ctx.U32[1], ctx.Const(1u), bit_index)};
bit = ctx.OpBitwiseAnd(ctx.U32[1], word, bit_index_mask);
} }
return ctx.OpINotEqual(ctx.U1, bit, ctx.u32_zero_value); return ctx.OpINotEqual(ctx.U1, bit, ctx.u32_zero_value);
} }