diff options
| author | Hal Finkel <hfinkel@anl.gov> | 2012-03-31 14:45:15 +0000 |
|---|---|---|
| committer | Hal Finkel <hfinkel@anl.gov> | 2012-03-31 14:45:15 +0000 |
| commit | 5b00ceaeeabff8c25abb09926343c3fcb06053d8 (patch) | |
| tree | 871027bb491aa31258b3949de78554eee8caea81 /lib/Target/PowerPC/PPCISelLowering.h | |
| parent | f5f256cffd7535d31dc24e7c9166f2084fe66e47 (diff) | |
Fix dynamic linking on PPC64.
Dynamic linking on PPC64 has had problems since we had to move the top-down
hazard-detection logic post-ra. For dynamic linking to work there needs to be
a nop placed after every call. It turns out that it is really hard to guarantee
that nothing will be placed in between the call (bl) and the nop during post-ra
scheduling. Previous attempts at fixing this by placing logic inside the
hazard detector only partially worked.
This is now fixed in a different way: call+nop codegen-only instructions. As far
as CodeGen is concerned the pair is now a single instruction and cannot be split.
This solution works much better than previous attempts.
The scoreboard hazard detector is also renamed to be more generic, there is currently
no cpu-specific logic in it.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153816 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Target/PowerPC/PPCISelLowering.h')
| -rw-r--r-- | lib/Target/PowerPC/PPCISelLowering.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/lib/Target/PowerPC/PPCISelLowering.h b/lib/Target/PowerPC/PPCISelLowering.h index 2e046c4693..e79229f49b 100644 --- a/lib/Target/PowerPC/PPCISelLowering.h +++ b/lib/Target/PowerPC/PPCISelLowering.h @@ -95,7 +95,9 @@ namespace llvm { EXTSW_32, /// CALL - A direct function call. - CALL_Darwin, CALL_SVR4, + /// CALL_NOP_SVR4 is a call with the special NOP which follows 64-bit + /// SVR4 calls. + CALL_Darwin, CALL_SVR4, CALL_NOP_SVR4, /// NOP - Special NOP which follows 64-bit SVR4 calls. NOP, |