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shader_recompiler: Fix BitCount64 and FindILsb64 (#1978)

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squidbus
2024-12-30 20:10:29 -08:00
committed by GitHub
parent 62780e4e43
commit 284f473a52
2 changed files with 19 additions and 5 deletions
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19
src/shader_recompiler/backend/spirv/emit_spirv_integer.cpp
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@@ -202,7 +202,14 @@ Id EmitBitCount32(EmitContext& ctx, Id value) {
}
Id EmitBitCount64(EmitContext& ctx, Id value) {
return ctx.OpBitCount(ctx.U64, value);
// Vulkan restricts some bitwise operations to 32-bit only, so decompose into
// two 32-bit values and add the result.
const Id unpacked{ctx.OpBitcast(ctx.U32[2], value)};
const Id lo{ctx.OpCompositeExtract(ctx.U32[1], unpacked, 0U)};
const Id hi{ctx.OpCompositeExtract(ctx.U32[1], unpacked, 1U)};
const Id lo_count{ctx.OpBitCount(ctx.U32[1], lo)};
const Id hi_count{ctx.OpBitCount(ctx.U32[1], hi)};
return ctx.OpIAdd(ctx.U32[1], lo_count, hi_count);
}
Id EmitBitwiseNot32(EmitContext& ctx, Id value) {
@@ -222,7 +229,15 @@ Id EmitFindILsb32(EmitContext& ctx, Id value) {
}
Id EmitFindILsb64(EmitContext& ctx, Id value) {
return ctx.OpFindILsb(ctx.U64, value);
// Vulkan restricts some bitwise operations to 32-bit only, so decompose into
// two 32-bit values and select the correct result.
const Id unpacked{ctx.OpBitcast(ctx.U32[2], value)};
const Id lo{ctx.OpCompositeExtract(ctx.U32[1], unpacked, 0U)};
const Id hi{ctx.OpCompositeExtract(ctx.U32[1], unpacked, 1U)};
const Id lo_lsb{ctx.OpFindILsb(ctx.U32[1], lo)};
const Id hi_lsb{ctx.OpFindILsb(ctx.U32[1], hi)};
const Id found_lo{ctx.OpINotEqual(ctx.U32[1], lo_lsb, ctx.ConstU32(u32(-1)))};
return ctx.OpSelect(ctx.U32[1], found_lo, lo_lsb, hi_lsb);
}
Id EmitSMin32(EmitContext& ctx, Id a, Id b) {