#8275: Loopification breaks profiling ----------------------------------------+---------------------------------- Reporter: jstolarek | Owner: Type: bug | Status: new Priority: high | Milestone: 7.10.1 Component: Profiling | Version: 7.7 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Building GHC failed | Unknown/Multiple Test Case: | Difficulty: Unknown Blocking: 8298 | Blocked By: | Related Tickets: ----------------------------------------+---------------------------------- Changes (by ezyang): * priority: highest => high * milestone: => 7.10.1 Old description:
Profiling is currently broken in HEAD. Setting `BuildFlavour = prof` in `build.mk` leads to a segfault during build. After reverting d61c3ac186c94021c851f7a2a6d20631e35fc1ba (loopification performed in the code generator) everything builds without problems.
We want the loop to begin after the stack check but before the heap check. Now if LDV code is placed before the stack check then of course
New description: Profiling is currently broken in HEAD. Setting `BuildFlavour = prof` in `build.mk` leads to a segfault during build. After reverting d61c3ac186c94021c851f7a2a6d20631e35fc1ba (loopification performed in the code generator) everything builds without problems. I am going to lower the priority since loopification is now no longer by default, and it looks like loopification by default will not make it to GHC 7.8. -- Comment: this requirement cannot be fulfilled. One way to deal with this, at the cost of increased code size, is to place a second copy of the LDV code in the function epilogue right before the loopification jump back. However, it might be OK to move the LDV check after the stack/heap checks. Simon Marlow might be able to better say. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8275#comment:16 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler