diff options
Diffstat (limited to 'lisc')
| -rw-r--r-- | lisc/FP (renamed from lisc/fpintro.txt) | 20 |
1 files changed, 15 insertions, 5 deletions
diff --git a/lisc/fpintro.txt b/lisc/FP index 9bfaf24..f448015 100644 --- a/lisc/fpintro.txt +++ b/lisc/FP @@ -1,8 +1,8 @@ Instructions classification: -FP : add, sub, mul, copy, par, arg +FP : add, sub, mul, sdiv, copy, par, arg Maybe : and, or, xor, cmp(6) -Non FP: sdiv, udiv, srem, urem, store(4), - load(7), ext(7), alloc(5), parc, argc, call +Non FP: udiv, srem, urem, store(4), load(7), + ext(7), alloc(5), parc, argc, call 15 bits for operations 32768 -1 bit for s,d 16384 @@ -10,10 +10,10 @@ Non FP: sdiv, udiv, srem, urem, store(4), New conversion instructions: - Bitcast conversion between fp and ints. cast - Convert fp to/from int. ftosi sitof (only signed at first, truncation) - - Convert single to/from double stod dtos + - Convert single to/from double fconv Summary: - Add cast, ftosi sitof, stod dtos + Add cast, ftosi sitof, fconv Add a 'floating point' bit to instructions Conversions from/to unsigned types are hard! I need to find a reference for that. @@ -21,3 +21,13 @@ Summary: Problem with "cls" field: for comparisons, this field is for the argument of the instruction, but, in the case of Load (for example), it is about the result. + +Roadmap in isel. + Make sure all floating point immediates are accessed + through a memory load. The load can be fused in some + instructions (add, sub, mul, div). This should be + handled similarly to the large integer constants. + + Complete ABI implementation, we should only need the + movsd instruction to transfer between sse registers and + memory. |