| ... | @@ -460,4 +460,72 @@ pub const Instruction = union(enum) { | ... | @@ -460,4 +460,72 @@ pub const Instruction = union(enum) { |
| 460 | .disp30 = udisp, | 460 | .disp30 = udisp, |
| 461 | } }; | 461 | } }; |
| 462 | } | 462 | } |
| | 463 | |
| | 464 | fn format2a(rd: Register, op2: u3, imm: i22) Instruction { |
| | 465 | const umm = @bitCast(u22, imm); |
| | 466 | return Instruction{ |
| | 467 | .format_2a = .{ |
| | 468 | .rd = rd.enc(), |
| | 469 | .op2 = op2, |
| | 470 | .imm22 = umm, |
| | 471 | }, |
| | 472 | }; |
| | 473 | } |
| | 474 | |
| | 475 | fn format2b(a: u1, cond: u4, op2: u3, disp: i24) Instruction { |
| | 476 | // In SPARC, branch target needs to be aligned to 4 bytes. |
| | 477 | assert(disp % 4 == 0); |
| | 478 | |
| | 479 | // Discard the last two bits since those are implicitly zero. |
| | 480 | const udisp = @truncate(u22, @bitCast(u24, disp) >> 2); |
| | 481 | return Instruction{ |
| | 482 | .format_2b = .{ |
| | 483 | .a = a, |
| | 484 | .cond = cond, |
| | 485 | .op2 = op2, |
| | 486 | .disp22 = udisp, |
| | 487 | }, |
| | 488 | }; |
| | 489 | } |
| | 490 | |
| | 491 | fn format2c(a: u1, cond: u4, op2: u3, cc1: u1, cc0: u1, p: u1, disp: i21) Instruction { |
| | 492 | // In SPARC, branch target needs to be aligned to 4 bytes. |
| | 493 | assert(disp % 4 == 0); |
| | 494 | |
| | 495 | // Discard the last two bits since those are implicitly zero. |
| | 496 | const udisp = @truncate(u19, @bitCast(u21, disp) >> 2); |
| | 497 | return Instruction{ |
| | 498 | .format_2c = .{ |
| | 499 | .a = a, |
| | 500 | .cond = cond, |
| | 501 | .op2 = op2, |
| | 502 | .cc1 = cc1, |
| | 503 | .cc0 = cc0, |
| | 504 | .p = p, |
| | 505 | .disp19 = udisp, |
| | 506 | }, |
| | 507 | }; |
| | 508 | } |
| | 509 | |
| | 510 | fn format2d(a: u1, rcond: u3, op2: u3, p: u1, rs1: Register, disp: i18) Instruction { |
| | 511 | // In SPARC, branch target needs to be aligned to 4 bytes. |
| | 512 | assert(disp % 4 == 0); |
| | 513 | |
| | 514 | // Discard the last two bits since those are implicitly zero, |
| | 515 | // and split it into low and high parts. |
| | 516 | const udisp = @truncate(u16, @bitCast(u18, disp) >> 2); |
| | 517 | const udisp_hi = @truncate(u2, (udisp & 0b1100_0000_0000_0000) >> 14); |
| | 518 | const udisp_lo = @truncate(u14, udisp & 0b0011_1111_1111_1111); |
| | 519 | return Instruction{ |
| | 520 | .format_2a = .{ |
| | 521 | .a = a, |
| | 522 | .rcond = rcond, |
| | 523 | .op2 = op2, |
| | 524 | .p = p, |
| | 525 | .rs1 = rs1.enc(), |
| | 526 | .d16hi = udisp_hi, |
| | 527 | .d16lo = udisp_lo, |
| | 528 | }, |
| | 529 | }; |
| | 530 | } |
| 463 | }; | 531 | }; |
Koakuma <koachan@protonmail.com> 2022-03-13 21:54:44+07:00