I'm trying to understand the output from the register allocator: (GHC version 7.9.20140626 for i386-unknown-linux): RegAllocLinear.allocRegsAndSpill: no spill candidates
allocating vreg: VirtualRegI n1nD assignment: [(n1nD,InMem 0),(n1nE,InReg (RealRegSingle 2)),(n1nF,InReg (RealRegSingle 3))] freeRegs: FreeRegs 4282318848 initFreeRegs: FreeRegs 4282318861 Without understanding exactly what's wrong, the message above suggests that we're trying to allocate a reg for n1nD, but there's already an assignment for that virtual reg, is that right? On Thu, Jun 26, 2014 at 3:05 PM, Johan Tibell <johan.tib...@gmail.com> wrote: > Herbert pushed my revert for me a minute ago. Everyone should be good once > they sync. > > > On Thu, Jun 26, 2014 at 2:51 PM, Johan Tibell <johan.tib...@gmail.com> > wrote: > >> I guess you don't have 04dd7cb3423f1940242fdfe2ea2e3b8abd68a177 (which I >> pushed this morning) which is fine. You should be in a good state now when >> d8abf85f8ca176854e9d5d0b12371c4bc402aac3 is reverted. >> >> >> On Thu, Jun 26, 2014 at 2:49 PM, Simon Peyton Jones < >> simo...@microsoft.com> wrote: >> >>> git revert d8abf85f8ca176854e9d5d0b12371c4bc402aac3 >>> >>> [master f958079] Revert "Add more primops for atomic ops on byte arrays" >>> >>> 23 files changed, 86 insertions(+), 1016 deletions(-) >>> >>> rewrite compiler/nativeGen/CPrim.hs (62%) >>> >>> delete mode 100644 libraries/ghc-prim/cbits/atomic.c >>> >>> delete mode 100644 testsuite/tests/concurrent/should_run/AtomicPrimops.hs >>> >>> delete mode 100644 >>> testsuite/tests/concurrent/should_run/AtomicPrimops.stdout >>> >>> HEAD $ git revert 04dd7cb3423f1940242fdfe2ea2e3b8abd68a177 >>> >>> fatal: bad object 04dd7cb3423f1940242fdfe2ea2e3b8abd68a177 >>> >>> HEAD $ >>> >>> What now? >>> >>> Simon >>> >>> >>> >>> *From:* Johan Tibell [mailto:johan.tib...@gmail.com] >>> *Sent:* 26 June 2014 13:25 >>> *To:* Simon Peyton Jones >>> *Cc:* Karel Gardas; ghc-devs >>> *Subject:* Re: Two days old build breakage on i386. >>> >>> >>> >>> Just to make sure this is the same breakage, are you on an i386 Windows >>> machine? If so git revert d8abf85f8ca176854e9d5d0b12371c4bc402aac3 >>> and 04dd7cb3423f1940242fdfe2ea2e3b8abd68a177 to get unstuck. >>> >>> >>> >>> On Thu, Jun 26, 2014 at 2:13 PM, Simon Peyton Jones < >>> simo...@microsoft.com> wrote: >>> >>> Aaaargh! Once again the Windows build is broken. I am utterly stalled. >>> >>> Moreover -fregs-graph and -fregs-iterative now *silently* do nothing. >>> At least they should elicit warnings saying that they are disabled pending >>> the fix to X and Y. >>> >>> Please can someone bisect to find out which patch is the culprit? >>> >>> I wish we had a more systematic way to find this out. I hate being the >>> main person who gets stuck because some unrelated change has broken the >>> Windows build. (Thanks for Karel, who got to it a day before me.) >>> >>> Thanks >>> >>> Simon >>> >>> >>> | -----Original Message----- >>> | From: ghc-devs [mailto:ghc-devs-boun...@haskell.org] On Behalf Of >>> Karel >>> | Gardas >>> | Sent: 26 June 2014 09:56 >>> | To: ghc-devs; Johan Tibell >>> | Subject: Two days old build breakage on i386. >>> | >>> | >>> | Hello, >>> | >>> | builders running on i386 building for this platform caught issue which >>> | shows as a build breakage: >>> | >>> | ghc-stage1: panic! (the 'impossible' happened) >>> | (GHC version 7.9.20140624 for i386-unknown-linux): >>> | RegAllocLinear.allocRegsAndSpill: no spill candidates >>> | allocating vreg: VirtualRegI n1Q6 >>> | assignment: [(c1PV,InMem 2),(n1Q5,InBoth (RealRegSingle 3) >>> | 0),(n1Q6,InMem 1),(n1Q7,InMem 3),(n1Q9,InReg (RealRegSingle 2))] >>> | freeRegs: FreeRegs 4282318848 >>> | initFreeRegs: FreeRegs 4282318861 >>> | Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug >>> | make[1]: *** >>> | [libraries/ghc-prim/dist-install/build/GHC/PrimopWrappers.o] Error 1 >>> | libraries/ghc-prim/ghc.mk:4: recipe for target >>> | 'libraries/ghc-prim/dist-install/build/GHC/PrimopWrappers.o' failed >>> | >>> | Have a look for example on linux-i386 buildot log here: >>> | >>> http://haskell.inf.elte.hu/builders/validator1-linux-x86-head/18/7.html >>> | >>> | Anyway, this happens on Linux, FreeBSD and Solaris buildbots on i386 so >>> | it's OS independent and probably 32bit/i386 platform specific and it's >>> | two days old breakage now. The last two night builds fail on all >>> | mentioned buildbots. I'm not sure but perhaps: >>> | >>> | commit d8abf85f8ca176854e9d5d0b12371c4bc402aac3 >>> | Author: Johan Tibell <johan.tib...@gmail.com> >>> | Date: Mon Jun 9 11:43:21 2014 +0200 >>> | >>> | triggers that issue? I'm not claiming that the commit is actual >>> culprit, >>> | this may be just recently un-hidden issue in linear regs allocator on >>> | i386! >>> | >>> | Thanks! >>> | Karel >>> >>> | _______________________________________________ >>> | ghc-devs mailing list >>> | ghc-devs@haskell.org >>> | http://www.haskell.org/mailman/listinfo/ghc-devs >>> >>> >>> >> >> >
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