diff options
Diffstat (limited to 'src/cmd/internal/obj')
| -rw-r--r-- | src/cmd/internal/obj/loong64/asm.go | 8 | ||||
| -rw-r--r-- | src/cmd/internal/obj/loong64/doc.go | 21 |
2 files changed, 27 insertions, 2 deletions
diff --git a/src/cmd/internal/obj/loong64/asm.go b/src/cmd/internal/obj/loong64/asm.go index 1d10ad67d9..76ad8e8779 100644 --- a/src/cmd/internal/obj/loong64/asm.go +++ b/src/cmd/internal/obj/loong64/asm.go @@ -425,7 +425,7 @@ var optab = []Optab{ {APRELD, C_SOREG, C_U5CON, C_NONE, C_NONE, C_NONE, 47, 4, 0, 0}, {APRELDX, C_SOREG, C_DCON, C_U5CON, C_NONE, C_NONE, 48, 20, 0, 0}, - {AALSLV, C_U2CON, C_REG, C_REG, C_REG, C_NONE, 64, 4, 0, 0}, + {AALSLV, C_U3CON, C_REG, C_REG, C_REG, C_NONE, 64, 4, 0, 0}, {obj.APCALIGN, C_U12CON, C_NONE, C_NONE, C_NONE, C_NONE, 0, 0, 0, 0}, {obj.APCDATA, C_32CON, C_NONE, C_NONE, C_32CON, C_NONE, 0, 0, 0, 0}, @@ -2742,8 +2742,12 @@ func (c *ctxt0) asmout(p *obj.Prog, o *Optab, out []uint32) { o1 = OP_RR(c.oprr(p.As), uint32(p.To.Reg), uint32(p.RegTo2)) case 64: // alsl rd, rj, rk, sa2 + sa := p.From.Offset - 1 + if sa > 3 { + c.ctxt.Diag("The shift amount is too large.") + } r := p.GetFrom3().Reg - o1 = OP_2IRRR(c.opirrr(p.As), uint32(p.From.Offset), uint32(r), uint32(p.Reg), uint32(p.To.Reg)) + o1 = OP_2IRRR(c.opirrr(p.As), uint32(sa), uint32(r), uint32(p.Reg), uint32(p.To.Reg)) case 65: // mov sym@GOT, r ==> pcalau12i + ld.d o1 = OP_IR(c.opir(APCALAU12I), uint32(0), uint32(p.To.Reg)) diff --git a/src/cmd/internal/obj/loong64/doc.go b/src/cmd/internal/obj/loong64/doc.go index a990b23089..64bb41ae5a 100644 --- a/src/cmd/internal/obj/loong64/doc.go +++ b/src/cmd/internal/obj/loong64/doc.go @@ -268,6 +268,27 @@ Note: In the following sections 3.1 to 3.6, "ui4" (4-bit unsigned int immediate) bits[11:1]: block size, the value range is [16, 1024], and it must be an integer multiple of 16 bits[20:12]: block num, the value range is [1, 256] bits[36:21]: stride, the value range is [0, 0xffff] + +4. ShiftAdd instructions + Mapping between Go and platform assembly: + Go assembly | platform assembly + ALSL.W/WU/V $Imm, Rj, Rk, Rd | alsl.w/wu/d rd, rj, rk, $imm + + Instruction encoding format is as follows: + + | 31 ~ 17 | 16 ~ 15 | 14 ~ 10 | 9 ~ 5 | 4 ~ 0 | + | opcode | sa2 | rk | rj | rd | + + The alsl.w/wu/v series of instructions shift the data in rj left by sa+1, add the value + in rk, and write the result to rd. + + To allow programmers to directly write the desired shift amount in assembly code, we actually write + the value of sa2+1 in the assembly code and then include the value of sa2 in the instruction encoding. + + For example: + + Go assembly | instruction Encoding + ALSLV $4, r4, r5, R6 | 002d9486 */ package loong64 |