RV32M, RV64M Instructions¶
mul¶
| 31-27 | 26-25 | 24-20 | 19-15 | 14-12 | 11-7 | 6-2 | 1-0 |
| 00000 | 01 | rs2 | rs1 | 000 | rd | 01100 | 11 |
| Format: | mul rd,rs1,rs2
|
|---|---|
| Description: | performs an XLEN-bit \(\times\) XLEN-bit multiplication of signed rs1 by signed rs2 and places the lower XLEN bits in the destination register.
|
| Implementation: | x[rd] = x[rs1] × x[rs2]
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mulh¶
| 31-27 | 26-25 | 24-20 | 19-15 | 14-12 | 11-7 | 6-2 | 1-0 |
| 00000 | 01 | rs2 | rs1 | 001 | rd | 01100 | 11 |
| Format: | mulh rd,rs1,rs2
|
|---|---|
| Description: | performs an XLEN-bit \(\times\) XLEN-bit multiplication of signed rs1 by signed rs2 and places the upper XLEN bits in the destination register.
|
| Implementation: | x[rd] = (x[rs1] s×s x[rs2]) >>s XLEN
|
mulhsu¶
| 31-27 | 26-25 | 24-20 | 19-15 | 14-12 | 11-7 | 6-2 | 1-0 |
| 00000 | 01 | rs2 | rs1 | 010 | rd | 01100 | 11 |
| Format: | mulhsu rd,rs1,rs2
|
|---|---|
| Description: | performs an XLEN-bit \(\times\) XLEN-bit multiplication of signed rs1 by unsigned rs2 and places the upper XLEN bits in the destination register.
|
| Implementation: | x[rd] = (x[rs1] s \(\times\) x[rs2]) >>s XLEN
|
mulhu¶
| 31-27 | 26-25 | 24-20 | 19-15 | 14-12 | 11-7 | 6-2 | 1-0 |
| 00000 | 01 | rs2 | rs1 | 011 | rd | 01100 | 11 |
| Format: | mulhu rd,rs1,rs2
|
|---|---|
| Description: | performs an XLEN-bit \(\times\) XLEN-bit multiplication of unsigned rs1 by unsigned rs2 and places the upper XLEN bits in the destination register.
|
| Implementation: | x[rd] = (x[rs1] u \(\times\) x[rs2]) >>u XLEN
|
div¶
| 31-27 | 26-25 | 24-20 | 19-15 | 14-12 | 11-7 | 6-2 | 1-0 |
| 00000 | 01 | rs2 | rs1 | 100 | rd | 01100 | 11 |
| Format: | div rd,rs1,rs2
|
|---|---|
| Description: | perform an XLEN bits by XLEN bits signed integer division of rs1 by rs2, rounding towards zero.
|
| Implementation: | x[rd] = x[rs1] /s x[rs2]
|
divu¶
| 31-27 | 26-25 | 24-20 | 19-15 | 14-12 | 11-7 | 6-2 | 1-0 |
| 00000 | 01 | rs2 | rs1 | 101 | rd | 01100 | 11 |
| Format: | divu rd,rs1,rs2
|
|---|---|
| Description: | perform an XLEN bits by XLEN bits unsigned integer division of rs1 by rs2, rounding towards zero.
|
| Implementation: | x[rd] = x[rs1] /u x[rs2]
|
rem¶
| 31-27 | 26-25 | 24-20 | 19-15 | 14-12 | 11-7 | 6-2 | 1-0 |
| 00000 | 01 | rs2 | rs1 | 110 | rd | 01100 | 11 |
| Format: | rem rd,rs1,rs2
|
|---|---|
| Description: | perform an XLEN bits by XLEN bits signed integer reminder of rs1 by rs2.
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| Implementation: | x[rd] = x[rs1] %s x[rs2]
|
remu¶
| 31-27 | 26-25 | 24-20 | 19-15 | 14-12 | 11-7 | 6-2 | 1-0 |
| 00000 | 01 | rs2 | rs1 | 111 | rd | 01100 | 11 |
| Format: | remu rd,rs1,rs2
|
|---|---|
| Description: | perform an XLEN bits by XLEN bits unsigned integer reminder of rs1 by rs2.
|
| Implementation: | x[rd] = x[rs1] %u x[rs2]
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