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| author | Evan Cheng <evan.cheng@apple.com> | 2009-04-17 01:29:40 +0000 |
|---|---|---|
| committer | Evan Cheng <evan.cheng@apple.com> | 2009-04-17 01:29:40 +0000 |
| commit | 276b77e66c538264d79b78c00bbad9f890f58011 (patch) | |
| tree | f668c05c94b70225a5bc83d12f1e1912cb485226 /lib/CodeGen/MachineFunction.cpp | |
| parent | d10a4ce5825d0981107c0106c49089b9e5792e40 (diff) | |
Teach spiller to unfold instructions which modref spill slot when a scratch
register is available and when it's profitable.
e.g.
xorq %r12<kill>, %r13
addq %rax, -184(%rbp)
addq %r13, -184(%rbp)
==>
xorq %r12<kill>, %r13
movq -184(%rbp), %r12
addq %rax, %r12
addq %r13, %r12
movq %r12, -184(%rbp)
Two more instructions, but fewer memory accesses. It can also open up
opportunities for more optimizations.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@69341 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/MachineFunction.cpp')
0 files changed, 0 insertions, 0 deletions