Ticket #3170 (closed bug: fixed)

Opened 4 years ago

Last modified 4 years ago

-fregs-graph: GraphOps.coalesceNodes: can't coalesce the same node.

Reported by: igloo Owned by: benl
Priority: high Milestone: 6.12.1
Component: Compiler Version: 6.10.2
Keywords: Cc:
Operating System: Unknown/Multiple Architecture: Unknown/Multiple
Type of failure: Difficulty: Unknown
Test Case: Blocked By:
Blocking: Related Tickets:

Description

If -fregs-graph is used then the build fails when compiling PrimOps.cmm: 

$ /home/ian/ghc/darcs/ghc/ghc/stage1-inplace/ghc  -Werror -H64m -O0 -fasm -optc-O2 -I../includes -I. -Iparallel -Ism -Ieventlog -DCOMPILING_RTS -package-name rts -static  -I../gmp/gmpbuild -I../libffi/build/include -I. -dcmm-lint     -c PrimOps.cmm -o PrimOps.o -fregs-graph
ghc: panic! (the 'impossible' happened)
  (GHC version 6.11.20090409 for x86_64-unknown-linux):
        GraphOps.coalesceNodes: can't coalesce the same node.

Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug

This blocks #2790.

Change History

Changed 4 years ago by benl

  • owner set to benl
  • status changed from new to assigned

Changed 4 years ago by benl

  • status changed from assigned to closed
  • resolution set to fixed

Sat Apr 18 18:22:53 EST 2009 Ben.Lippmeier@…

  • Fix #3170: Allow coalescing of the same node during register allocation. The x86 code generator sometimes generates nop moves like movl %vI_a %vI_a, but we'll just ignore them for coalescing purposes instead of emitting an error. It shouldn't hurt anything.
Note: See TracTickets for help on using tickets.