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Commit Graph

Author	SHA1	Message	Date
Evan Cheng	2a2947885a	Follow up to r165072. Try a different approach: only move the load when it's going to be folded into the call. rdar://12437604 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@165287 91177308-0d34-0410-b5e6-96231b3b80d8	2012-10-05 01:48:22 +00:00
Evan Cheng	2b87e06d26	Fix a serious X86 instruction selection bug. In X86DAGToDAGISel::PreprocessISelDAG(), isel is moving load inside callseq_start / callseq_end so it can be folded into a call. This can create a cycle in the DAG when the call is glued to a copytoreg. We have been lucky this hasn't caused too many issues because the pre-ra scheduler has special handling of call sequences. However, it has caused a crash in a specific tailcall case. rdar://12393897 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@165072 91177308-0d34-0410-b5e6-96231b3b80d8	2012-10-02 23:49:13 +00:00

Author

SHA1

Message

Date

Evan Cheng

2a2947885a

Follow up to r165072. Try a different approach: only move the load when it's going to be folded into the call. rdar://12437604

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@165287 91177308-0d34-0410-b5e6-96231b3b80d8

2012-10-05 01:48:22 +00:00

Evan Cheng

2b87e06d26

Fix a serious X86 instruction selection bug. In

X86DAGToDAGISel::PreprocessISelDAG(), isel is moving load inside
callseq_start / callseq_end so it can be folded into a call. This can
create a cycle in the DAG when the call is glued to a copytoreg. We
have been lucky this hasn't caused too many issues because the pre-ra
scheduler has special handling of call sequences. However, it has
caused a crash in a specific tailcall case.

rdar://12393897


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@165072 91177308-0d34-0410-b5e6-96231b3b80d8

2012-10-02 23:49:13 +00:00

2 Commits