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| author | Quentin Carbonneaux <quentin@c9x.me> | 2019-03-12 21:15:21 +0100 |
|---|---|---|
| committer | Quentin Carbonneaux <quentin@c9x.me> | 2019-03-13 22:02:29 +0100 |
| commit | b777cd6c4becf0d834f8fa549315fa11918a53be (patch) | |
| tree | 10e19572ac0f336c5248565323d6a9c71dceeed1 /fold.c | |
| parent | fd65f4275be6dc6603be9610e88c55b8bfc1dc62 (diff) | |
| download | roux-b777cd6c4becf0d834f8fa549315fa11918a53be.tar.gz | |
simple heuristic to reuse stack slots
On test/spill1.ssa, the stack frame of
the function f() goes from 56 bytes to
40 bytes. That's a reduction of close
to 30%.
This patch also opens the door to
folding operations on spill slots.
For example
movl $15, %r15d
addl -X(%rbp), %r15d
movl %r15d, -X(%rbp)
should become
add $15, -X(%rbp)
when %r15d is not used afterwards.
Diffstat (limited to 'fold.c')
0 files changed, 0 insertions, 0 deletions