Compile-time constant arrays are copied for variable indexing, rather indexing through their original name

Consider the following HLSL shader with an initialized static const int array (derived from a real-life compute shader that generates perlin noise):

Texture2D texture0;
SamplerState sampler0;

cbuffer FrameData
{
int g_index;
};

struct PixelInput
{
float4 position : SV_POSITION;
float4 color0 : COLOR0;
float4 color1 : COLOR1;
};

static const int values[512] = {
0x000, 0x001, 0x002, 0x003, 0x004, 0x005, 0x006, 0x007, 0x008, 0x009, 0x00a, 0x00b, 0x00c, 0x00d, 0x00e, 0x00f,
0x1b0, 0x1b1, 0x1b2, 0x1b3, 0x1b4, 0x1b5, 0x1b6, 0x1b7, 0x1b8, 0x1b9, 0x1ba, 0x1bb, 0x1bc, 0x1bd, 0x1be, 0x1bf,
0x0e0, 0x0e1, 0x0e2, 0x0e3, 0x0e4, 0x0e5, 0x0e6, 0x0e7, 0x0e8, 0x0e9, 0x0ea, 0x0eb, 0x0ec, 0x0ed, 0x0ee, 0x0ef,
0x050, 0x051, 0x052, 0x053, 0x054, 0x055, 0x056, 0x057, 0x058, 0x059, 0x05a, 0x05b, 0x05c, 0x05d, 0x05e, 0x05f,
0x1f0, 0x1f1, 0x1f2, 0x1f3, 0x1f4, 0x1f5, 0x1f6, 0x1f7, 0x1f8, 0x1f9, 0x1fa, 0x1fb, 0x1fc, 0x1fd, 0x1fe, 0x1ff,
0x010, 0x011, 0x012, 0x013, 0x014, 0x015, 0x016, 0x017, 0x018, 0x019, 0x01a, 0x01b, 0x01c, 0x01d, 0x01e, 0x01f,
0x0b0, 0x0b1, 0x0b2, 0x0b3, 0x0b4, 0x0b5, 0x0b6, 0x0b7, 0x0b8, 0x0b9, 0x0ba, 0x0bb, 0x0bc, 0x0bd, 0x0be, 0x0bf,
0x170, 0x171, 0x172, 0x173, 0x174, 0x175, 0x176, 0x177, 0x178, 0x179, 0x17a, 0x17b, 0x17c, 0x17d, 0x17e, 0x17f,
0x0f0, 0x0f1, 0x0f2, 0x0f3, 0x0f4, 0x0f5, 0x0f6, 0x0f7, 0x0f8, 0x0f9, 0x0fa, 0x0fb, 0x0fc, 0x0fd, 0x0fe, 0x0ff,
0x020, 0x021, 0x022, 0x023, 0x024, 0x025, 0x026, 0x027, 0x028, 0x029, 0x02a, 0x02b, 0x02c, 0x02d, 0x02e, 0x02f,
0x1d0, 0x1d1, 0x1d2, 0x1d3, 0x1d4, 0x1d5, 0x1d6, 0x1d7, 0x1d8, 0x1d9, 0x1da, 0x1db, 0x1dc, 0x1dd, 0x1de, 0x1df
0x070, 0x071, 0x072, 0x073, 0x074, 0x075, 0x076, 0x077, 0x078, 0x079, 0x07a, 0x07b, 0x07c, 0x07d, 0x07e, 0x07f,
0x090, 0x091, 0x092, 0x093, 0x094, 0x095, 0x096, 0x097, 0x098, 0x099, 0x09a, 0x09b, 0x09c, 0x09d, 0x09e, 0x09f,
0x040, 0x041, 0x042, 0x043, 0x044, 0x045, 0x046, 0x047, 0x048, 0x049, 0x04a, 0x04b, 0x04c, 0x04d, 0x04e, 0x04f,
0x0c0, 0x0c1, 0x0c2, 0x0c3, 0x0c4, 0x0c5, 0x0c6, 0x0c7, 0x0c8, 0x0c9, 0x0ca, 0x0cb, 0x0cc, 0x0cd, 0x0ce, 0x0cf,
0x0d0, 0x0d1, 0x0d2, 0x0d3, 0x0d4, 0x0d5, 0x0d6, 0x0d7, 0x0d8, 0x0d9, 0x0da, 0x0db, 0x0dc, 0x0dd, 0x0de, 0x0df,
0x100, 0x101, 0x102, 0x103, 0x104, 0x105, 0x106, 0x107, 0x108, 0x109, 0x10a, 0x10b, 0x10c, 0x10d, 0x10e, 0x10f,
0x110, 0x111, 0x112, 0x113, 0x114, 0x115, 0x116, 0x117, 0x118, 0x119, 0x11a, 0x11b, 0x11c, 0x11d, 0x11e, 0x11f,
0x120, 0x121, 0x122, 0x123, 0x124, 0x125, 0x126, 0x127, 0x128, 0x129, 0x12a, 0x12b, 0x12c, 0x12d, 0x12e, 0x12f,
0x130, 0x131, 0x132, 0x133, 0x134, 0x135, 0x136, 0x137, 0x138, 0x139, 0x13a, 0x13b, 0x13c, 0x13d, 0x13e, 0x13f,
0x030, 0x031, 0x032, 0x033, 0x034, 0x035, 0x036, 0x037, 0x038, 0x039, 0x03a, 0x03b, 0x03c, 0x03d, 0x03e, 0x03f,
0x080, 0x081, 0x082, 0x083, 0x084, 0x085, 0x086, 0x087, 0x088, 0x089, 0x08a, 0x08b, 0x08c, 0x08d, 0x08e, 0x08f,
0x140, 0x141, 0x142, 0x143, 0x144, 0x145, 0x146, 0x147, 0x148, 0x149, 0x14a, 0x14b, 0x14c, 0x14d, 0x14e, 0x14f,
0x1c0, 0x1c1, 0x1c2, 0x1c3, 0x1c4, 0x1c5, 0x1c6, 0x1c7, 0x1c8, 0x1c9, 0x1ca, 0x1cb, 0x1cc, 0x1cd, 0x1ce, 0x1cf,
0x150, 0x151, 0x152, 0x153, 0x154, 0x155, 0x156, 0x157, 0x158, 0x159, 0x15a, 0x15b, 0x15c, 0x15d, 0x15e, 0x15f,
0x160, 0x161, 0x162, 0x163, 0x164, 0x165, 0x166, 0x167, 0x168, 0x169, 0x16a, 0x16b, 0x16c, 0x16d, 0x16e, 0x16f,
0x180, 0x181, 0x182, 0x183, 0x184, 0x185, 0x186, 0x187, 0x188, 0x189, 0x18a, 0x18b, 0x18c, 0x18d, 0x18e, 0x18f,
0x190, 0x191, 0x192, 0x193, 0x194, 0x195, 0x196, 0x197, 0x198, 0x199, 0x19a, 0x19b, 0x19c, 0x19d, 0x19e, 0x19f,
0x060, 0x061, 0x062, 0x063, 0x064, 0x065, 0x066, 0x067, 0x068, 0x069, 0x06a, 0x06b, 0x06c, 0x06d, 0x06e, 0x06f,
0x1a0, 0x1a1, 0x1a2, 0x1a3, 0x1a4, 0x1a5, 0x1a6, 0x1a7, 0x1a8, 0x1a9, 0x1aa, 0x1ab, 0x1ac, 0x1ad, 0x1ae, 0x1af,
0x1e0, 0x1e1, 0x1e2, 0x1e3, 0x1e4, 0x1e5, 0x1e6, 0x1e7, 0x1e8, 0x1e9, 0x1ea, 0x1eb, 0x1ec, 0x1ed, 0x1ee, 0x1ef,
0x0a0, 0x0a1, 0x0a2, 0x0a3, 0x0a4, 0x0a5, 0x0a6, 0x0a7, 0x0a8, 0x0a9, 0x0aa, 0x0ab, 0x0ac, 0x0ad, 0x0ae, 0x0af,
};

int GetValue(int i)
{
return values[i & 255];
}

float4 main(PixelInput input) : SV_TARGET
{
int v = GetValue(g_index);
return lerp(input.color0, input.color1, v / 511.0);
}

Here is the SPIR-V that is generated for GetValue. Note that the initialized static const int array is generated as a function scope variable that is initialized at runtime:

%GetValue_i1_ = OpFunction %int None %8
%i = OpFunctionParameter %_ptr_Function_int
%11 = OpLabel
%indexable = OpVariable %_ptr_Function__arr_int_uint_512 Function
%536 = OpLoad %int %i
%537 = OpBitwiseAnd %int %536 %int_255
OpStore %indexable %535
%540 = OpAccessChain %_ptr_Function_int %indexable %537
%541 = OpLoad %int %540
OpReturnValue %541
OpFunctionEnd

While this is functionally correct, it seems runtime-inefficient. Would it be correct to instead generate the static const int as an initialized variable in the UniformConstant storage class?

Reproduce the HLSL example and inspect the generated SPIR-V for the GetValue entry point, especially the function-scope array and its initialization. Determine whether UniformConstant is valid for this static const array and what storage class preserves the intended behavior without runtime copying; done means the generated representation is correct and runtime-efficient.

Written by the indexing model from the issue text.