diff options
Diffstat (limited to 'llvm/lib/Target/ARM/README-Thumb.txt')
| -rw-r--r-- | llvm/lib/Target/ARM/README-Thumb.txt | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/llvm/lib/Target/ARM/README-Thumb.txt b/llvm/lib/Target/ARM/README-Thumb.txt new file mode 100644 index 00000000000..e9e943d0ae2 --- /dev/null +++ b/llvm/lib/Target/ARM/README-Thumb.txt @@ -0,0 +1,17 @@ +//===---------------------------------------------------------------------===// +// Random ideas for the ARM backend (Thumb specific). +//===---------------------------------------------------------------------===// + +* Add support for compiling functions in both ARM and Thumb mode, then taking + the smallest. +* Add support for compiling individual basic blocks in thumb mode, when in a + larger ARM function. This can be used for presumed cold code, like paths + to abort (failure path of asserts), EH handling code, etc. + +* Thumb doesn't have normal pre/post increment addressing modes, but you can + load/store 32-bit integers with pre/postinc by using load/store multiple + instrs with a single register. + +* Make better use of high registers r8, r10, r11, r12 (ip). Some variants of add + and cmp instructions can use high registers. Also, we can use them as + temporaries to spill values into. |
