wiki:GcnInstrsFlat

Version 5 (modified by trac, 8 years ago) (diff)

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GCN ISA FLAT instructions

These instructions allow to access to main memory, LDS and VGPR registers. FLAT instructions fetch address from 2 vector registers that hold 64-bit address. FLAT instruction presents only in GCN 1.1 architecture.

List of fields for the FLAT encoding (GCN 1.1):

Bits Name Description
16 GLC Operation globally coherent
17 SLC System level coherent
18-24 OPCODE Operation code
25-31 ENCODING Encoding type. Must be 0b110111
32-39 VADDR Vector address registers
40-47 VDATA Vector data register
55 TFE Texture Fail Enable ???
56-63 VDST Vector destination register

Instruction syntax: INSTRUCTION VDST, VADDR(2) [MODIFIERS]
Instruction syntax: INSTRUCTION VADDR(2), VDATA [MODIFIERS]

Modifiers can be supplied in any order. Modifiers list: SLC, GLC, TFE. The TFE flag requires additional the VDATA register.

FLAT instruction can complete out of order with each other. This can be caused by different resources from/to that instruction can load/store. FLAT instruction increase VMCNT if access to main memory, or LKGMCNT if accesses to LDS.

Instructions by opcode

List of the FLAT instructions by opcode (GCN 1.1/1.2):

Opcode Mnemonic (GCN1.1) Mnemonic (GCN1.2)
8 (0x8) FLAT_LOAD_UBYTE --
9 (0x9) FLAT_LOAD_SBYTE --
10 (0xa) FLAT_LOAD_USHORT --
11 (0xb) FLAT_LOAD_SSHORT --
12 (0xc) FLAT_LOAD_DWORD --
13 (0xd) FLAT_LOAD_DWORDX2 --
14 (0xe) FLAT_LOAD_DWORDX4 --
15 (0xf) FLAT_LOAD_DWORDX3 --
16 (0x10) -- FLAT_LOAD_UBYTE
17 (0x11) -- FLAT_LOAD_SBYTE
18 (0x12) -- FLAT_LOAD_USHORT
19 (0x13) -- FLAT_LOAD_SSHORT
20 (0x14) -- FLAT_LOAD_DWORD
21 (0x15) -- FLAT_LOAD_DWORDX2
22 (0x16) -- FLAT_LOAD_DWORDX3
23 (0x17) -- FLAT_LOAD_DWORDX4
24 (0x18) FLAT_STORE_BYTE FLAT_STORE_BYTE
26 (0x1a) FLAT_STORE_SHORT FLAT_STORE_SHORT
28 (0x1c) FLAT_STORE_DWORD FLAT_STORE_DWORD
29 (0x1d) FLAT_STORE_DWORDX2 FLAT_STORE_DWORDX2
30 (0x1e) FLAT_STORE_DWORDX4 FLAT_STORE_DWORDX3
31 (0x1f) FLAT_STORE_DWORDX3 FLAT_STORE_DWORDX4
48 (0x30) FLAT_ATOMIC_SWAP --
49 (0x31) FLAT_ATOMIC_CMPSWAP --
50 (0x32) FLAT_ATOMIC_ADD --
51 (0x33) FLAT_ATOMIC_SUB --
53 (0x35) FLAT_ATOMIC_SMIN --
54 (0x36) FLAT_ATOMIC_UMIN --
55 (0x37) FLAT_ATOMIC_SMAX --
56 (0x38) FLAT_ATOMIC_UMAX --
57 (0x39) FLAT_ATOMIC_AND --
58 (0x3a) FLAT_ATOMIC_OR --
59 (0x3b) FLAT_ATOMIC_XOR --
60 (0x3c) FLAT_ATOMIC_INC --
61 (0x3d) FLAT_ATOMIC_DEC --
62 (0x3e) FLAT_ATOMIC_FCMPSWAP --
63 (0x3f) FLAT_ATOMIC_FMIN --
64 (0x40) FLAT_ATOMIC_FMAX FLAT_ATOMIC_SWAP
65 (0x41) -- FLAT_ATOMIC_CMPSWAP
66 (0x42) -- FLAT_ATOMIC_ADD
67 (0x43) -- FLAT_ATOMIC_SUB
68 (0x44) -- FLAT_ATOMIC_SMIN
69 (0x45) -- FLAT_ATOMIC_UMIN
70 (0x46) -- FLAT_ATOMIC_SMAX
71 (0x47) -- FLAT_ATOMIC_UMAX
72 (0x48) -- FLAT_ATOMIC_AND
73 (0x49) -- FLAT_ATOMIC_OR
74 (0x4a) -- FLAT_ATOMIC_XOR
75 (0x4b) -- FLAT_ATOMIC_INC
76 (0x4c) -- FLAT_ATOMIC_DEC
80 (0x50) FLAT_ATOMIC_SWAP_X2 --
81 (0x51) FLAT_ATOMIC_CMPSWAP_X2 --
82 (0x52) FLAT_ATOMIC_ADD_X2 --
83 (0x53) FLAT_ATOMIC_SUB_X2 --
85 (0x55) FLAT_ATOMIC_SMIN_X2 --
86 (0x56) FLAT_ATOMIC_UMIN_X2 --
87 (0x57) FLAT_ATOMIC_SMAX_X2 --
88 (0x58) FLAT_ATOMIC_UMAX_X2 --
89 (0x59) FLAT_ATOMIC_AND_X2 --
90 (0x5a) FLAT_ATOMIC_OR_X2 --
91 (0x5b) FLAT_ATOMIC_XOR_X2 --
92 (0x5c) FLAT_ATOMIC_INC_X2 --
93 (0x5d) FLAT_ATOMIC_DEC_X2 --
94 (0x5e) FLAT_ATOMIC_FCMPSWAP_X2 --
95 (0x5f) FLAT_ATOMIC_FMIN_X2 --
96 (0x60) FLAT_ATOMIC_FMAX_X2 FLAT_ATOMIC_SWAP_X2
97 (0x61) -- FLAT_ATOMIC_CMPSWAP_X2
98 (0x62) -- FLAT_ATOMIC_ADD_X2
99 (0x63) -- FLAT_ATOMIC_SUB_X2
100 (0x64) -- FLAT_ATOMIC_SMIN_X2
101 (0x65) -- FLAT_ATOMIC_UMIN_X2
102 (0x66) -- FLAT_ATOMIC_SMAX_X2
103 (0x67) -- FLAT_ATOMIC_UMAX_X2
104 (0x68) -- FLAT_ATOMIC_AND_X2
105 (0x69) -- FLAT_ATOMIC_OR_X2
106 (0x6a) -- FLAT_ATOMIC_XOR_X2
107 (0x6b) -- FLAT_ATOMIC_INC_X2
108 (0x6c) -- FLAT_ATOMIC_DEC_X2

Instruction set

Alphabetically sorted instruction list:

FLAT_ATOMIC_ADD

Opcode: 50 (0x32) for GCN 1.1; 66 (0x42) for GCN 1.2
Syntax: FLAT_ATOMIC_ADD VDST, VADDR(2), VDATA
Description: Add VDATA to value of VADDR address, and store result to this address. If GLC flag is set then return previous value from this address to VDST, otherwise keep VDST value. Operation is atomic.
Operation:
UINT32* VM = (UINT32*)VADDR UINT32 P = *VM; *VM = *VM + VDATA; VDST = (GLC) ? P : VDST // atomic

FLAT_ATOMIC_ADD_X2

Opcode: 82 (0x52) for GCN 1.1; 98 (0x62) for GCN 1.2
Syntax: FLAT_ATOMIC_ADD_X2 VDST(2), VADDR(2), VDATA(2)
Description: Add 64-bit VDATA to 64-bit value of VADDR address, and store result to this address. If GLC flag is set then return previous value from resource to VDST, otherwise keep VDST value. Operation is atomic.
Operation:
UINT64* VM = (UINT64*)VADDR UINT64 P = *VM; *VM = *VM + VDATA; VDST = (GLC) ? P : VDST // atomic

FLAT_ATOMIC_AND

Opcode: 57 (0x39) for GCN 1.1; 72 (0x48) for GCN 1.2
Syntax: FLAT_ATOMIC_AND VDST, VADDR(2), VDATA
Description: Do bitwise AND on VDATA and value of VADDR address, and store result to this address. If GLC flag is set then return previous value from this address to VDST, otherwise keep VDST value. Operation is atomic.
Operation:
UINT32* VM = (UINT32*)VADDR UINT32 P = *VM; *VM = *VM & VDATA; VDST = (GLC) ? P : VDST // atomic

FLAT_ATOMIC_AND_X2

Opcode: 89 (0x59) for GCN 1.1; 104 (0x68) for GCN 1.2
Syntax: FLAT_ATOMIC_AND_X2 VDST(2), VADDR(2), VDATA(2)
Description: Do 64-bit bitwise AND on VDATA and value of VADDR address, and store result to this address. If GLC flag is set then return previous value from this address to VDST, otherwise keep VDST value. Operation is atomic.
Operation:
UINT64* VM = (UINT64*)VADDR UINT64 P = *VM; *VM = *VM & VDATA; VDST = (GLC) ? P : VDST // atomic

FLAT_ATOMIC_CMPSWAP

Opcode: 49 (0x31) for GCN 1.1; 65 (0x41) for GCN 1.2
Syntax: FLAT_ATOMIC_CMPSWAP VDST, VADDR(2), VDATA(2)
Description: Store lower VDATA dword into VADDR address if previous value from that address is equal VDATA>>32, otherwise keep old value from address. If GLC flag is set then return previous value from resource to VDST, otherwise keep VDST value. Operation is atomic.
Operation:
UINT32* VM = (UINT32*)VADDR UINT32 P = *VM; *VM = *VM==(VDATA>>32) ? VDATA&0xffffffff : *VM // part of atomic VDST = (GLC) ? P : VDST // last part of atomic

FLAT_ATOMIC_CMPSWAP_X2

Opcode: 81 (0x51) for GCN 1.1; 97 (0x61) for GCN 1.2
Syntax: FLAT_ATOMIC_CMPSWAP_X2 VDST(2), VADDR(2), VDATA(4)
Description: Store lower VDATA 64-bit word into VADDR address if previous value from resource is equal VDATA>>64, otherwise keep old value from VADDR. If GLC flag is set then return previous value from VADDR to VDST, otherwise keep VDST value. Operation is atomic.
Operation:
UINT64* VM = (UINT64*)VADDR UINT64 P = *VM; *VM = *VM==(VDATA[2:3]) ? VDATA[0:1] : *VM // part of atomic VDST = (GLC) ? P : VDST // last part of atomic

FLAT_ATOMIC_DEC

Opcode: 61 (0x3d) for GCN 1.1; 76 (0x4c) for GCN 1.2
Syntax: FLAT_ATOMIC_DEC VDST, VADDR(2), VDATA
Description: Compare value from VADDR address and if less or equal than VDATA and this value is not zero, then decrement value from VADDR address, otherwise store VDATA to this address. If GLC flag is set then return previous value from this address to VDST, otherwise keep VDST value. Operation is atomic.
Operation:
UINT32* VM = (UINT32*)VADDR UINT32 P = *VM; *VM = (*VM <= VDATA && *VM!=0) ? *VM-1 : VDATA // atomic VDST = (GLC) ? P : VDST // atomic

FLAT_ATOMIC_DEC_X2

Opcode: 93 (0x5d) for GCN 1.1; 108 (0x6c) for GCN 1.2
Syntax: FLAT_ATOMIC_DEC_X2 VDST(2), VADDR(2), VDATA(2)
Description: Compare 64-bit value from VADDR address and if less or equal than VDATA and this value is not zero, then decrement value from VADDR address, otherwise store VDATA to this address. If GLC flag is set then return previous value from this address to VDST, otherwise keep VDST value. Operation is atomic.
Operation:
UINT64* VM = (UINT64*)VADDR UINT64 P = *VM; *VM = (*VM <= VDATA && *VM!=0) ? *VM-1 : VDATA // atomic VDST = (GLC) ? P : VDST // atomic

BUFFER_ATOMIC_FCMPSWAP

Opcode: 62 (0x3e) for GCN 1.1
Syntax: FLAT_ATOMIC_FCMPSWAP VDST, VADDR(1:2), VDATA(2)
Description: Store lower VDATA dword into VADDR address if previous single floating point value from address is equal singe floating point value VDATA>>32, otherwise keep old value from VADDR address. If GLC flag is set then return previous value from this address to VDST, otherwise keep VDST value. Operation is atomic.
Operation:
FLOAT* VM = (FLOAT*)VADDR FLOAT P = *VM; *VM = *VM==ASFLOAT(VDATA>>32) ? VDATA&0xffffffff : *VM // part of atomic VDST[0] = (GLC) ? P : VDST // last part of atomic

FLAT_ATOMIC_FCMPSWAP_X2

Opcode: 94 (0x5e) for GCN 1.1
Syntax: FLAT_ATOMIC_FCMPSWAP_X2 VDATA(2), VADDR(2), SRSRC(4), SOFFSET
Description: Store lower VDATA 64-bit word into VADDR address if previous double floating point value from address is equal singe floating point value VDATA>>32, otherwise keep old value from VADDR address. If GLC flag is set then return previous value from address to VDST, otherwise keep VDST value. Operation is atomic.
Operation:
DOUBLE* VM = (DOUBLE*)VMADDR DOUBLE P = *VM; *VM = *VM==ASDOUBLE(VDATA[2:3]) ? VDATA[0:1] : *VM // part of atomic VDST = (GLC) ? P : VDST // last part of atomic

FLAT_ATOMIC_FMAX

Opcode: 64 (0x40) for GCN 1.1
Syntax: FLAT_ATOMIC_FMAX VDST, VADDR(2), VDATA
Description: Choose greatest single floating point value from VDATA and from VADDR address, and store result to this address. If GLC flag is set then return previous value from address to VDST, otherwise keep VDST value. Operation is atomic.
Operation:
FLOAT* VM = (FLOAT*)VADDR UINT32 P = *VM; *VM = MAX(*VM, ASFLOAT(VDATA)); VDST = (GLC) ? P : VDST // atomic

BUFFER_ATOMIC_FMAX_X2

Opcode: 96 (0x60) for GCN 1.1
Syntax: FLAT_ATOMIC_FMAX_X2 VDST(2), VADDR(2), VDATA(2)
Description: Choose greatest double floating point value from VDATA and from VADDR address, and store result to this address. If GLC flag is set then return previous value from address to VDST, otherwise keep VDST value. Operation is atomic.
Operation:
DOUBLE* VM = (DOUBLE*)VADDR UINT64 P = *VM; *VM = MAX(*VM, ASDOUBLE(VDATA)); VDST = (GLC) ? P : VDST // atomic

FLAT_ATOMIC_FMIN

Opcode: 63 (0x3f) for GCN 1.1
Syntax: FLAT_ATOMIC_FMIN VDST, VADDR(2), VDATA
Description: Choose smallest single floating point value from VDATA and from VADDR address, and store result to this address. If GLC flag is set then return previous value from address to VDST, otherwise keep VDST value. Operation is atomic.
Operation:
FLOAT* VM = (FLOAT*)VADDR UINT32 P = *VM; *VM = MIN(*VM, ASFLOAT(VDATA)); VDST = (GLC) ? P : VDST // atomic

BUFFER_ATOMIC_FMIN_X2

Opcode: 95 (0x5f) for GCN 1.1
Syntax: FLAT_ATOMIC_FMIN_X2 VDST(2), VADDR(2), VDATA(2)
Description: Choose smallest double floating point value from VDATA and from VADDR address, and store result to this address. If GLC flag is set then return previous value from address to VDST, otherwise keep VDST value. Operation is atomic.
Operation:
DOUBLE* VM = (DOUBLE*)VADDR UINT64 P = *VM; *VM = MIN(*VM, ASDOUBLE(VDATA)); VDST = (GLC) ? P : VDST // atomic

FLAT_ATOMIC_INC

Opcode: 60 (0x3c) for GCN 1.1; 75 (0x4b) for GCN 1.2
Syntax: FLT_ATOMIC_INC VDST, VADDR(2), VDATA
Description: Compare value from VADDR address and if less than VDATA, then increment value from address, otherwise store zero to address. If GLC flag is set then return previous value from this address to VDST, otherwise keep VDST value. Operation is atomic.
Operation:
UINT32* VM = (UINT32*)VADDR UINT32 P = *VM; *VM = (*VM < VDATA) ? *VM+1 : 0; VDST = (GLC) ? P : VDST // atomic

FLAT_ATOMIC_INC_X2

Opcode: 92 (0x5c) for GCN 1.1; 107 (0x9b) for GCN 1.2
Syntax: FLAT_ATOMIC_INC_X2 VDST(2), VADDR(2), VADDR(2)
Description: Compare 64-bit value from VADDR address and if less than VDATA, then increment value from address, otherwise store zero to address. If GLC flag is set then return previous value from this address to VDST, otherwise keep VDST value. Operation is atomic.
Operation:
UINT64* VM = (UINT64*)VADDR UINT64 P = *VM; *VM = (*VM < VDATA) ? *VM+1 : 0; VDST = (GLC) ? P : VDST // atomic

FLAT_ATOMIC_OR

Opcode: 58 (0x3a) for GCN 1.1; 73 (0x49) for GCN 1.2
Syntax: FLAT_ATOMIC_OR VDST, VADDR(2), VDATA
Description: Do bitwise OR on VDATA and value of VADDR address, and store result to this address. If GLC flag is set then return previous value from this address to VDST, otherwise keep VDST value. Operation is atomic.
Operation:
UINT32* VM = (UINT32*)VADDR UINT32 P = *VM; *VM = *VM | VDATA; VDST = (GLC) ? P : VDST // atomic

FLAT_ATOMIC_OR_X2

Opcode: 90 (0x5a) for GCN 1.1; 105 (0x69) for GCN 1.2
Syntax: FLAT_ATOMIC_OR_X2 VDST(2), VADDR(2), VDATA(2)
Description: Do 64-bit bitwise OR on VDATA and value of VADDR address, and store result to this address. If GLC flag is set then return previous value from this address to VDST, otherwise keep VDST value. Operation is atomic.
Operation:
UINT64* VM = (UINT64*)VADDR UINT64 P = *VM; *VM = *VM | VDATA; VDST = (GLC) ? P : VDST // atomic

FLAT_ATOMIC_SMAX

Opcode: 55 (0x37) for GCN 1.1; 70 (0x46) for GCN 1.2
Syntax: FLAT_ATOMIC_SMAX VDST, VADDR(2), VDATA
Description: Choose greatest signed 32-bit value from VDATA and from VADDR address, and store result to this address. If GLC flag is set then return previous value from this address to VDST, otherwise keep VDST value. Operation is atomic.
Operation:
INT32* VM = (INT32*)VADDR UINT32 P = *VM; *VM = MAX(*VM, (INT32)VDATA); VDST = (GLC) ? P : VDST // atomic

FLAT_ATOMIC_SMAX_X2

Opcode: 87 (0x57) for GCN 1.1; 102 (0x66) for GCN 1.2
Syntax: FLAT_ATOMIC_SMAX_X2 VDST(2), VADDR(2), VDATA(2)
Description: Choose greatest signed 64-bit value from VDATA and from VADDR address, and store result to this address. If GLC flag is set then return previous value from this address to VDST, otherwise keep VDST value. Operation is atomic.
Operation:
INT64* VM = (INT64*)VADDR UINT64 P = *VM; *VM = MAX(*VM, (INT64)VDATA); VDST = (GLC) ? P : VDST // atomic

FLAT_ATOMIC_SMIN

Opcode: 53 (0x35) for GCN 1.1; 68 (0x44) for GCN 1.2
Syntax: FLAT_ATOMIC_SMIN VDST, VADDR(2), VDATA
Description: Choose smallest signed 32-bit value from VDATA and from VADDR address, and store result to this address. If GLC flag is set then return previous value from this address to VDST, otherwise keep VDST value. Operation is atomic.
Operation:
INT32* VM = (INT32*)VADDR UINT32 P = *VM; *VM = MIN(*VM, (INT32)VDATA); VDST = (GLC) ? P : VDST // atomic

FLAT_ATOMIC_SMIN_X2

Opcode: 85 (0x55) for GCN 1.1; 100 (0x64) for GCN 1.2
Syntax: FLAT_ATOMIC_SMIN_X2 VDST(2), VADDR(2), VDATA(2)
Description: Choose smallest signed 64-bit value from VDATA and from VADDR address, and store result to this address. If GLC flag is set then return previous value from this address to VDST, otherwise keep VDST value. Operation is atomic.
Operation:
INT64* VM = (INT64*)VADDR UINT64 P = *VM; *VM = MIN(*VM, (INT64)VDATA); VDST = (GLC) ? P : VDST // atomic

FLAT_ATOMIC_SUB

Opcode: 51 (0x33) for GCN 1.1; 67 (0x43) for GCN 1.2
Syntax: FLAT_ATOMIC_SUB VDST, VADDR(2), VDATA
Description: Subtract VDATA from value of VADDR address, and store result to this address. If GLC flag is set then return previous value from this address to VDST, otherwise keep VDST value. Operation is atomic.
Operation:
UINT32* VM = (UINT32*)VADDR UINT32 P = *VM; *VM = *VM - VDATA; VDST = (GLC) ? P : VDST // atomic

FLAT_ATOMIC_SUB_X2

Opcode: 83 (0x53) for GCN 1.1; 99 (0x63) for GCN 1.2
Syntax: FLAT_ATOMIC_SUB_X2 VDST(2), VADDR(2), VDATA(2)
Description: Subtract 64-bit VDATA from 64-bit value of VADDR address, and store result to this address. If GLC flag is set then return previous value from resource to VDST, otherwise keep VDST value. Operation is atomic.
Operation:
UINT64* VM = (UINT64*)VADDR UINT64 P = *VM; *VM = *VM - VDATA; VDST = (GLC) ? P : VDST // atomic

FLAT_ATOMIC_SWAP

Opcode: 48 (0x30) for GCN 1.1; 64 (0x40) for GCN 1.2
Syntax: FLAT_ATOMIC_SWAP VDST, VADDR(2), VDATA Description: Store VDATA dword into VADDR address. If GLC flag is set then return previous value from VADDR address to VDST, otherwise keep old value from VDST. Operation is atomic.
Operation:
UINT32* VM = (UINT32*)VADDR UINT32 P = *VM; *VM = VDATA; VDST = (GLC) ? P : VDST // atomic

FLAT_ATOMIC_SWAP_X2

Opcode: 80 (0x50) for GCN 1.1; 96 (0x60) for GCN 1.2
Syntax: FLAT_ATOMIC_SWAP_X2 VDST(2), VADDR(2), VDATA(2) Description: Store VDATA 64-bit word into VADDR address. If GLC flag is set then return previous value from VADDR address to VDST, otherwise keep old value from VDST. Operation is atomic.
Operation:
UINT64* VM = (UINT64*)VADDR UINT64 P = *VM; *VM = VDATA; VDST = (GLC) ? P : VDST // atomic

FLAT_ATOMIC_UMAX

Opcode: 56 (0x38) for GCN 1.1; 71 (0x47) for GCN 1.2
Syntax: FLAT_ATOMIC_UMAX VDST, VADDR(2), VDATA
Description: Choose greatest unsigned 32-bit value from VDATA and from VADDR address, and store result to this address. If GLC flag is set then return previous value from this address to VDST, otherwise keep VDST value. Operation is atomic.
Operation:
UINT32* VM = (UINT32*)VADDR UINT32 P = *VM; *VM = MAX(*VM, (UINT32)VDATA); VDST = (GLC) ? P : VDST // atomic

FLAT_ATOMIC_UMAX_X2

Opcode: 88 (0x58) for GCN 1.1; 103 (0x67) for GCN 1.2
Syntax: FLAT_ATOMIC_UMAX_X2 VDST(2), VADDR(2), VDATA(2)
Description: Choose greatest unsigned 64-bit value from VDATA and from VADDR address, and store result to this address. If GLC flag is set then return previous value from this address to VDST, otherwise keep VDST value. Operation is atomic.
Operation:
UINT64* VM = (UINT64*)VADDR UINT64 P = *VM; *VM = MAX(*VM, (UINT64)VDATA); VDST = (GLC) ? P : VDST // atomic

FLAT_ATOMIC_UMIN

Opcode: 54 (0x36) for GCN 1.1; 69 (0x45) for GCN 1.2
Syntax: FLAT_ATOMIC_UMIN VDST, VADDR(2), VDATA
Description: Choose smallest unsigned 32-bit value from VDATA and from VADDR address, and store result to this address. If GLC flag is set then return previous value from this address to VDST, otherwise keep VDST value. Operation is atomic.
Operation:
UINT32* VM = (UINT32*)VADDR UINT32 P = *VM; *VM = MIN(*VM, (UINT32)VDATA); VDST = (GLC) ? P : VDST // atomic

FLAT_ATOMIC_UMIN_X2

Opcode: 86 (0x56) for GCN 1.1; 101 (0x65) for GCN 1.2
Syntax: FLAT_ATOMIC_UMIN_X2 VDST(2), VADDR(2), VDATA(2)
Description: Choose smallest unsigned 64-bit value from VDATA and from VADDR address, and store result to this address. If GLC flag is set then return previous value from this address to VDST, otherwise keep VDST value. Operation is atomic.
Operation:
UINT64* VM = (UINT64*)VADDR UINT64 P = *VM; *VM = MIN(*VM, (UINT64)VDATA); VDST = (GLC) ? P : VDST // atomic

FLAT_ATOMIC_XOR

Opcode: 59 (0x3b) for GCN 1.1; 74 (0x4a) for GCN 1.2
Syntax: FLAT_ATOMIC_XOR VDST, VADDR(2), VDATA
Description: Do bitwise XOR on VDATA and value of VADDR address, and store result to this address. If GLC flag is set then return previous value from this address to VDST, otherwise keep VDST value. Operation is atomic.
Operation:
UINT32* VM = (UINT32*)VADDR UINT32 P = *VM; *VM = *VM ^ VDATA; VDST = (GLC) ? P : VDST // atomic

FLAT_ATOMIC_XOR_X2

Opcode: 91 (0x5b) for GCN 1.1; 106 (0x6a) for GCN 1.2
Syntax: FLAT_ATOMIC_XOR_X2 VDST(2), VADDR(2), VDATA(2)
Description: Do 64-bit bitwise XOR on VDATA and value of VADDR address, and store result to this address. If GLC flag is set then return previous value from this address to VDST, otherwise keep VDST value. Operation is atomic.
Operation:
UINT64* VM = (UINT64*)VADDR UINT64 P = *VM; *VM = *VM ^ VDATA; VDST = (GLC) ? P : VDST // atomic

FLAT_LOAD_DWORD

Opcode: 12 (0xc) for GCN 1.1; 20 (0x14) for GCN 1.2
Syntax: FLAT_LOAD_DWORD VDST, VADDR(2)
Description Load dword to VDST from VADDR address.
Operation:
VDST = *(UINT32*)VADDR

FLAT_LOAD_DWORDX2

Opcode: 13 (0xd) for GCN 1.1; 21 (0x15) for GCN 1.2
Syntax: FLAT_LOAD_DWORDX2 VDST(, VADDR(2)
Description Load two dwords to VDST from VADDR address.
Operation:
VDST = *(UINT64*)VADDR

FLAT_LOAD_DWORDX3

Opcode: 15 (0xf) for GCN 1.1; 22 (0x16) for GCN 1.2
Syntax: FLAT_LOAD_DWORDX3 VDST(3), VADDR(2)
Description Load three dwords to VDST from VADDR address.
Operation:
VDST[0] = *(UINT32*)VADDR VDST[1] = *(UINT32*)(VADDR+4) VDST[2] = *(UINT32*)(VADDR+8)

FLAT_LOAD_DWORDX4

Opcode: 13 (0xe) for GCN 1.1; 23 (0x17) for GCN 1.2
Syntax: FLAT_LOAD_DWORDX4 VDST(4), VADDR(2)
Description Load four dwords to VDST from VADDR address.
Operation:
VDST[0] = *(UINT32*)VADDR VDST[1] = *(UINT32*)(VADDR+4) VDST[2] = *(UINT32*)(VADDR+8) VDST[3] = *(UINT32*)(VADDR+12)

FLAT_LOAD_SBYTE

Opcode: 9 (0x9) for GCN 1.1; 17 (0x11) for GCN 1.2
Syntax: FLAT_LOAD_SBYTE VDST, VADDR(2)
Description: Load byte to VDST from VADDR address with sign extending.
Operation:
VDST = *(INT8*)VADDR

FLAT_LOAD_SSHORT

Opcode: 11 (0xb) for GCN 1.1; 19 (0x13) for GCN 1.2
Syntax: FLAT_LOAD_SSHORT VDST, VADDR(2)
Description: Load 16-bit word to VDST from VADDR address with sign extending.
Operation:
VDST = *(INT16*)VADDR

FLAT_LOAD_UBYTE

Opcode: 8 (0x8) for GCN 1.1; 16 (0x10) for GCN 1.2
Syntax: FLAT_LOAD_UBYTE VDST, VADDR(2)
Description: Load byte to VDST from VADDR address with zero extending.
Operation:
VDST = *(UINT8*)VADDR

FLAT_LOAD_USHORT

Opcode: 10 (0xa) for GCN 1.1; 18 (0x12) for GCN 1.2
Syntax: FLAT_LOAD_USHORT VDST, VADDR(1:2)
Description: Load 16-bit word to VDST from VADDR address with zero extending.
Operation:
VDST = *(UINT16*)VADDR

FLAT_STORE_BYTE

Opcode: 24 (0x18)
Syntax: FLAT_STORE_BYTE VADDR(2), VDATA
Description: Store byte from VDATA to VADDR address.
Operation:
*(UINT8*)VADDR = VDATA&0xff

FLAT_STORE_DWORD

Opcode: 28 (0x1c)
Syntax: FLAT_STORE_DWORD VADDR(2), VDATA
Description: Store dword from VDATA to VADDR address.
Operation:
*(UINT32*)VADDR = VDATA

FLAT_STORE_DWORDX2

Opcode: 29 (0x1d)
Syntax: FLAT_STORE_DWORDX2 VADDR(2), VDATA(2)
Description: Store two dwords from VDATA to VADDR address.
Operation:
*(UINT64*)VADDR = VDATA

FLAT_STORE_DWORDX3

Opcode: 31 (0x1f) for GCN 1.1; 30 (0x1e) for GCN 1.2
Syntax: FLAT_STORE_DWORDX3 VADDR(2), VDATA(3)
Description: Store three dwords from VDATA to VADDR address.
Operation:
*(UINT32*)(VADDR) = VDATA[0] *(UINT32*)(VADDR+4) = VDATA[1] *(UINT32*)(VADDR+8) = VDATA[2]

FLAT_STORE_DWORDX4

Opcode: 30 (0x1e) for GCN 1.1; 31 (0x1d) for GCN 1.2
Syntax: FLAT_STORE_DWORDX4 VADDR(2), VDATA(4)
Description: Store four dwords from VDATA to VADDR address.
Operation:
*(UINT32*)(VADDR) = VDATA[0] *(UINT32*)(VADDR+4) = VDATA[1] *(UINT32*)(VADDR+8) = VDATA[2] *(UINT32*)(VADDR+12) = VDATA[3]

FLAT_STORE_SHORT

Opcode: 26 (0x1a)
Syntax: FLAT_STORE_SHORT VADDR(2), VDATA
Description: Store 16-bit word from VDATA to VADDR address.
Operation:
*(UINT16*)VADDR = VDATA&0xffff