llvm-project

Commit Graph

Author	SHA1	Message	Date
Benjamin Kramer	599a4bb6ea	LoopRotation: Make the brute force DomTree update more brute force. We update until we hit a fixpoint. This is probably slow but also slightly simplifies the code. It should also fix the occasional invalid domtrees observed when building with expensive checking. I couldn't find a case where this had a measurable slowdown, but if someone finds a pathological case where it does we may have to find a cleverer way of updating dominators here. Thanks to Duncan for the test case. llvm-svn: 163091	2012-09-02 11:57:22 +00:00
Benjamin Kramer	17ce7117d0	Fix test case. llvm-svn: 162913	2012-08-30 15:42:45 +00:00
Benjamin Kramer	afdfdb5cff	LoopRotate: Also rotate loops with multiple exits. The old PHI updating code in loop-rotate was replaced with SSAUpdater a while ago, it has no problems with comples PHIs. What had to be fixed is detecting whether a loop was already rotated and updating dominators when multiple exits were present. This change increases overall code size a bit, mostly due to additional loop unrolling opportunities. Passes test-suite and selfhost with -verify-dom-info. Fixes PR7447. Thanks to Andy for the input on the domtree updating code. llvm-svn: 162912	2012-08-30 15:39:42 +00:00

Author

SHA1

Message

Date

Benjamin Kramer

599a4bb6ea

LoopRotation: Make the brute force DomTree update more brute force.

We update until we hit a fixpoint. This is probably slow but also
slightly simplifies the code. It should also fix the occasional
invalid domtrees observed when building with expensive checking.

I couldn't find a case where this had a measurable slowdown, but
if someone finds a pathological case where it does we may have
to find a cleverer way of updating dominators here.

Thanks to Duncan for the test case.

llvm-svn: 163091

2012-09-02 11:57:22 +00:00

Benjamin Kramer

17ce7117d0

Fix test case.

llvm-svn: 162913

2012-08-30 15:42:45 +00:00

Benjamin Kramer

afdfdb5cff

LoopRotate: Also rotate loops with multiple exits.

The old PHI updating code in loop-rotate was replaced with SSAUpdater a while
ago, it has no problems with comples PHIs. What had to be fixed is detecting
whether a loop was already rotated and updating dominators when multiple exits
were present.

This change increases overall code size a bit, mostly due to additional loop
unrolling opportunities. Passes test-suite and selfhost with -verify-dom-info.
Fixes PR7447.

Thanks to Andy for the input on the domtree updating code.

llvm-svn: 162912

2012-08-30 15:39:42 +00:00

3 Commits