| Version 2 (modified by trac, 8 years ago) (diff) |
|---|
GCN ISA SOP2 instructions
Encoding
The basic encoding of the SOP2 instructions needs 4 bytes (dword). List of fields:
| Bits | Name | Description |
|---|---|---|
| 0-7 | SSRC0 | First scalar source operand. Refer to operand encoding |
| 8-15 | SSRC1 | Second scalar source operand. Refer to operand encoding |
| 16-22 | SDST | Destination scalar operand. Refer to operand encoding |
| 23-29 | OPCODE | Operation code |
| 30-31 | ENCODING | Encoding type. Must be 0b10 |
Syntax for all instructions: INSTRUCTION SDST, SSRC0, SSRC1
Example: s_and_b32 s0, s1, s2
List of the instructions by opcode:
| Opcode | Mnemonic |
|---|---|
| 0 | S_ADD_U32 |
| 1 | S_SUB_U32 |
| 2 | S_ADD_I32 |
| 3 | S_SUB_I32 |
| 4 | S_ADDC_U32 |
| 5 | S_SUBB_U32 |
| 6 | S_MIN_I32 |
| 7 | S_MIN_U32 |
| 8 | S_MAX_I32 |
| 9 | S_MAX_U32 |
| 10 | S_CSELECT_B32 |
| 11 | S_CSELECT_B64 |
| 14 | S_AND_B32 |
| 15 | S_AND_B64 |
| 16 | S_OR_B32 |
| 17 | S_OR_B64 |
| 18 | S_XOR_B32 |
| 19 | S_XOR_B64 |
Instruction set
Alphabetically sorted instruction list:
S_ADDC_U32
Opcode: 4 (0x4)
Syntax: S_ADDC_U32 SDST, SSRC0, SSRC1
Descrition: Add SSRC0 to SSRC1 with SCC value and store result into SDST and store
carry-out flag into SCC.
Operation:
temp = (UINT64)SSRC0 + (UINT64)SSRC1 + SCC
SDST = temp
SCC = temp>>32
S_ADD_I32
Opcode: 2 (0x2)
Syntax: S_ADD_I32 SDST, SSRC0, SSRC1
Description: Add SSRC0 to SSRC1 and store result into SDST and store overflow flag into SCC.
Operation:
SDST = SSRC0 + SSRC1
temp = (UINT64)SSRC0 + (UINT64)SSRC1
SCC = temp>((1LL<<31)-1) || temp>(-1LL<<31)
S_ADD_U32
Opcode: 0 (0x0)
Syntax: S_ADD_U32 SDST, SSRC0, SSRC1
Description: Add SSRC0 to SSRC1 and store result into SDST and store carry-out into SCC.
Operation:
SDST = SSRC0 + SSRC1
SCC = ((UINT64)SSRC0 + (UINT64)SSRC1)>>32
S_AND_B32
Opcode: 14 (0xe)
Syntax: S_AND_B32 SDST, SSRC0, SSRC1
Description: Do bitwise AND operation on SSRC0 and SSRC1 and store it to SDST, and store
1 to SCC if result is not zero, otherwise store 0 to SCC.
Operation:
SDST = SSRC0 & SSRC1
SCC = (SSRC0 & SSRC1)!=0
S_AND_B64
Opcode: 15 (0xf)
Syntax: S_AND_B64 SDST(2), SSRC0(2), SSRC1(2)
Description: Do bitwise AND operation on SSRC0 and SSRC1 and store it to SDST, and store
1 to SCC if result is not zero, otherwise store 0 to SCC.
Operation:
SDST = SSRC0 & SSRC1
SCC = (SSRC0 & SSRC1)!=0
S_ANDN2_B32
Opcode: 20 (0x14)
Syntax: S_ANDN2_B32 SDST, SSRC0, SSRC1
Description: Do bitwise AND operation on SSRC0 and negated SSRC1 and store it to SDST,
and store 1 to SCC if result is not zero, otherwise store 0 to SCC.
Operation:
SDST = SSRC0 & ~SSRC1
SCC = (SSRC0 & ~SSRC1)!=0
S_ANDN2_B64
Opcode: 21 (0x15)
Syntax: S_ANDN2_B64 SDST(2), SSRC0(2), SSRC1(2)
Description: Do bitwise AND operation on SSRC0 and bitwise negated SSRC1 and store
it to SDST, and store 1 to SCC if result is not zero, otherwise store 0 to SCC.
Operation:
SDST = SSRC0 & ~SSRC1
SCC = (SSRC0 & ~SSRC1)!=0
S_CSELECT_B32
Opcode: 10 (0xa)
Syntax: S_CSELECT_B32 SDST, SSRC0, SSRC1
Description: If SCC is 1 then store SSRC0 into SDST, otherwise store SSRC1 into SDST.
SCC has not been changed.
Operation:
SDST = SCC ? SSRC0 : SSRC1
S_CSELECT_B64
Opcode: 11 (0xb)
Syntax: S_CSELECT_B32 SDST(2), SSRC0(2), SSRC1(2)
Description: If SCC is 1 then store 64-bit SSRC0 into SDST, otherwise store
64-bit SSRC1 into SDST. SCC has not been changed.
Operation:
SDST = SCC ? SSRC0 : SSRC1
S_MIN_I32
Opcode: 6 (0x6)
Syntax: S_MIN_I32 SDST, SSRC0, SSRC1
Description: Choose smallest signed value value from SSRC0 and SSRC1 and store its into SDST,
and store 1 to SCC if SSSRC0 value has been choosen, otherwise store 0 to SCC
Operation:
SDST = (INT32)SSSRC0<(INT32)SSSRC1 ? SSSRC0 : SSSRC1
SCC = (INT32)SSSRC0<(INT32)SSSRC1
S_MIN_U32
Opcode: 7 (0x7)
Syntax: S_MIN_U32 SDST, SSRC0, SSRC1
Description: Choose smallest unsigned value value from SSRC0 and SSRC1 and store its into SDST,
and store 1 to SCC if SSSRC0 value has been choosen, otherwise store 0 to SCC
Operation:
SDST = (UINT32)SSSRC0<(UINT32)SSSRC1 ? SSSRC0 : SSSRC1
SCC = (UINT32)SSSRC0<(UINT32)SSSRC1
S_MAX_I32
Opcode: 8 (0x9)
Syntax: S_MIN_I32 SDST, SSRC0, SSRC1
Description: Choose largest signed value value from SSRC0 and SSRC1 and store its into SDST,
and store 1 to SCC if SSSRC0 value has been choosen, otherwise store 0 to SCC
Operation:
SDST = (INT32)SSSRC0>(INT32)SSSRC1 ? SSSRC0 : SSSRC1
SCC = (INT32)SSSRC0>(INT32)SSSRC1
S_MAX_U32
Opcode: 9 (0x9)
Syntax: S_MAX_U32 SDST, SSRC0, SSRC1
Description: Choose largest unsigned value value from SSRC0 and SSRC1 and store its into SDST,
and store 1 to SCC if SSSRC0 value has been choosen, otherwise store 0 to SCC
Operation:
SDST = (UINT32)SSSRC0>(UINT32)SSSRC1 ? SSSRC0 : SSSRC1
SCC = (UINT32)SSSRC0>(UINT32)SSSRC1
S_OR_B32
Opcode: 16 (0x10)
Syntax: S_OR_B32 SDST, SSRC0, SSRC1
Description: Do bitwise OR operation on SSRC0 and SSRC1 and store it to SDST, and store
1 to SCC if result is not zero, otherwise store 0 to SCC.
Operation:
SDST = SSRC0 | SSRC1
SCC = (SSRC0 | SSRC1)!=0
S_OR_B64
Opcode: 17 (0x11)
Syntax: S_OR_B64 SDST(2), SSRC0(2), SSRC1(2)
Description: Do bitwise OR operation on SSRC0 and SSRC1 and store it to SDST, and store
1 to SCC if result is not zero, otherwise store 0 to SCC.
Operation:
SDST = SSRC0 | SSRC1
SCC = (SSRC0 | SSRC1)!=0
S_ORN2_B32
Opcode: 22 (0x16)
Syntax: S_ORN2_B32 SDST, SSRC0, SSRC1
Description: Do bitwise OR operation on SSRC0 and negated SSRC1 and store it to SDST,
and store 1 to SCC if result is not zero, otherwise store 0 to SCC.
Operation:
SDST = SSRC0 | ~SSRC1
SCC = (SSRC0 | ~SSRC1)!=0
S_ORN2_B64
Opcode: 23 (0x17)
Syntax: S_ORN2_B64 SDST(2), SSRC0(2), SSRC1(2)
Description: Do bitwise OR operation on SSRC0 and negated SSRC1 and store it to SDST,
and store 1 to SCC if result is not zero, otherwise store 0 to SCC.
Operation:
SDST = SSRC0 | ~SSRC1
SCC = (SSRC0 | ~SSRC1)!=0
S_SUBB_U32
Opcode: 5 (0x5)
Syntax: S_SUBB_U32 SDST, SSRC0, SSRC1
Descrition: Subtract SSRC0 to SSRC1 with SCC value and store result into SDST and store
carry-out flag into SCC.
Operation:
temp = (UINT64)SSRC0 - (UINT64)SSRC1 - SCC
SDST = temp
SCC = temp>>32
S_SUB_I32
Opcode: 3 (0x3)
Syntax: S_SUB_I32 SDST, SSRC0, SSRC1
Description: Subtract SSRC0 to SSRC1 and store result into SDST and
store overflow flag into SCC. SCC register value can be BROKEN for some
architectures (GCN1.0)
Operation:
SDST = SSRC0 - SSRC1
temp = (UINT64)SSRC0 - (UINT64)SSRC1
SCC = temp>((1LL<<31)-1) || temp>(-1LL<<31)
S_SUB_U32
Opcode: 1 (0x1)
Syntax: S_SUB_U32 SDST, SSRC0, SSRC1
Description: Subtract SSRC0 to SSRC1 and store result into SDST and store borrow into SCC.
Operation:
SDST = SSRC0 - SSRC1
SCC = ((INT64)SSRC0 - (INT64)SSRC1)>>32
S_XOR_B32
Opcode: 18 (0x12)
Syntax: S_XOR_B32 SDST, SSRC0, SSRC1
Description: Do bitwise XOR operation on SSRC0 and SSRC1 and store it to SDST, and store
1 to SCC if result is not zero, otherwise store 0 to SCC.
Operation:
SDST = SSRC0 ^ SSRC1
SCC = (SSRC0 ^ SSRC1)!=0
S_XOR_B64
Opcode: 19 (0x13)
Syntax: S_XOR_B64 SDST(2), SSRC0(2), SSRC1(2)
Description: Do bitwise XOR operation on SSRC0 and SSRC1 and store it to SDST, and store
1 to SCC if result is not zero, otherwise store 0 to SCC.
Operation:
SDST = SSRC0 ^ SSRC1
SCC = (SSRC0 ^ SSRC1)!=0
