qbt
Optimizing middle/back end for triscv. Takes pretty heavy inspiration from QBE: https://c9x.me/compile/
Instruction documentation is TODO, please see src/parser.y for current list of
instructions. They may still change in the near future.
ABI
Currently I'm assuming the ABI to be according to the following table, but this is not quite set in stone yet.
| Register | Name |
|----------|------|
| x0 | x0
| x1 | sp
| x2 | fp
| x3 | gp
| x4 | a0
| x5 | a1
| x6 | a2
| x7 | a3
| x8 | a4
| x9 | a5
| x10 | a6
| x11 | t0
| x12 | t1
| x13 | t2
| x14 | t3
| x15 | t4
| x16 | t5
| x17 | t6
| x18 | s0
| x19 | s1
| x20 | s2
| x21 | s3
| x22 | s4
| x23 | s5
| x24 | s6
| x25 | tp
| x26 | ra
| x27 | a7
| x28 | a8
| x29 | a9
| x30 | a10
| x31 | a11
| x32 | a12
| x33 | a13
| x34 | a14
| x35 | a15
| x36 | a16
| x37 | a17
| x38 | a19
| x39 | a20
| x40 | a20
| x41 | a21
| x42 | a22
| x43 | a23
| x44 | tmp0
| x45 | t7
| x46 | t8
| x47 | t9
| x48 | t10
| x49 | t11
| x50 | t12
| x51 | t13
| x52 | t14
| x53 | t15
| x54 | t16
| x55 | t17
| x56 | t18
| x57 | t19
| x58 | t20
| x59 | t21
| x60 | t22
| x61 | t23
| x62 | tmp1
| x63 | s7
| x64 | s8
| x65 | s9
| x66 | s10
| x67 | s11
| x68 | s12
| x69 | s13
| x70 | s14
| x71 | s15
| x72 | s16
| x73 | s17
| x74 | s18
| x75 | s19
| x76 | s20
| x77 | s21
| x78 | s22
| x79 | s23
| x80 | tmp2