STTILECFG

STTILECFG — Store Tile Configuration

Opcode/ Instruction	Op/ En	64/32 bit Mode Support	CPUID Feature Flag	Description
VEX.128.66.0F38.W0 49 !(11):000:bbb STTILECFG m512	A	V/N.E.	AMX_TILE	Store tile configuration in m512.

Instruction Operand Encoding

Op/En	Tuple	Operand 1	Operand 2	Operand 3	Operand 4
A	N/A	ModRM:r/m (w)	N/A	N/A	N/A

Description

The STTILECFG instruction takes a pointer to a 64-byte memory location (described in Table 3-56 in the “LDTI-

tion of the tiles that were configured. In order to configure tiles, the AMX_TILE bit in CPUID must be set and the operating system has to have enabled the tiles architecture.

If the tiles are not configured, then STTILECFG stores 64B of zeros to the indicated memory location.

Any attempt to execute the STTILECFG instruction inside an Intel TSX transaction will result in a transaction abort.

Operation

STTILECFG mem

if TILES_CONFIGURED == 0:
    //write 64 bytes of zeros at mem pointer
    buf[0..63] ← 0
    write_memory(mem, 64, buf)
else:
    buf.byte[0] ← tilecfg.palette_id
    buf.byte[1] ← tilecfg.start_row
    buf.byte[2..15] ← 0
    p ← 16
    for n in 0 ... palette_table[tilecfg.palette_id].max_names-1:
        buf.word[p/2] ← tilecfg.t[n].colsb
        p ← p + 2
    if p < 47:
        buf.byte[p..47] ← 0
    p ← 48
    for n in 0 ... palette_table[tilecfg.palette_id].max_names-1:
        buf.byte[p++] ← tilecfg.t[n].rows
    if p < 63:
        buf.byte[p..63] ← 0
    write_memory(mem, 64, buf)

Intel C/C++ Compiler Intrinsic Equivalent

STTILECFGvoid _tile_storeconfig(void *);

Flags Affected

None.

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Source: Intel® 64 and IA-32 Architectures Software Developer's Manual, Combined Volumes (Order Number 325462-091US, March 2026)
Generated: 7-6-2026