[llvm] r210789 - Disable the load/store optimization pass for Thumb-1.

James Molloy james at jamesmolloy.co.uk
Mon Jun 16 01:06:29 PDT 2014 

Sure. I'll fix it after I've had my morning coffee. Bad things can happen
if I commit before then.


On 15 June 2014 21:07, Eric Christopher <echristo at gmail.com> wrote:

> On Sun, Jun 15, 2014 at 11:41 AM, James Molloy <james at jamesmolloy.co.uk>
> wrote:
> > Hi Eric,
> >
> > Sure. Sorry, I didn't know there was a preferred way of doing this. The
> > reason I did it like I did was simply that was how it was disabled before
> > Moritz reenabled it!
> >
>
> No worries. Mind fixing it? :)
>
> -eric
>
> > I'll bear in mind for the future.
> > Cheers,
> >
> > James
> >
> >
> > On 15 June 2014 02:48, Eric Christopher <echristo at gmail.com> wrote:
> >>
> >>
> >> On Jun 14, 2014 6:39 PM, "David Blaikie" <dblaikie at gmail.com> wrote:
> >> >
> >> > I know already, but it might be useful to explain why (especially
> >> > given that there are other examples of similar code there already).
> >> >
> >>
> >> Good idea. :)
> >>
> >> > My half-baked attempt: James: the subtarget may vary from function to
> >> > function (in Eric's glorious ifunc future) and he'd like to have just
> >> > one pass pipeline that can be used for all functions, even across
> >> > subtarget variations. While the world isn't there yet, it'd be nice to
> >> > avoid making more work.
> >> >
> >> > Eric - are there passes that already do this? Precedent to point to
> >> > for an example of the way you think will work? Or is it all backwards
> >> > for now?
> >>
> >> X86, PPC, aarch64, and I thought arm all did it this way. I fixed them a
> >> while back.
> >>
> >> -eric
> >>
> >> >
> >> > - David
> >> >
> >> > On Sat, Jun 14, 2014 at 6:27 PM, Eric Christopher <echristo at gmail.com
> >
> >> > wrote:
> >> > > Please don't do this in this way, just have the pass return that it
> >> > > did no
> >> > > work rather than conditionally including it in the pipeline.
> >> > >
> >> > > Thanks. :)
> >> > >
> >> > > -eric
> >> > >
> >> > > On Jun 12, 2014 8:29 AM, "James Molloy" <james.molloy at arm.com>
> wrote:
> >> > >>
> >> > >> Author: jamesm
> >> > >> Date: Thu Jun 12 10:18:33 2014
> >> > >> New Revision: 210789
> >> > >>
> >> > >> URL: http://llvm.org/viewvc/llvm-project?rev=210789&view=rev
> >> > >> Log:
> >> > >> Disable the load/store optimization pass for Thumb-1.
> >> > >>
> >> > >> Moritz's changes have improved codegen a lot, but further testing
> >> > >> showed
> >> > >> significant correctness problems. Disable by default until these
> have
> >> > >> been
> >> > >> worked out.
> >> > >>
> >> > >> Patch by Moritz Roth!
> >> > >>
> >> > >> Modified:
> >> > >>     llvm/trunk/lib/Target/ARM/ARMTargetMachine.cpp
> >> > >>     llvm/trunk/test/CodeGen/Thumb/2014-06-10-thumb1-ldst-opt-bug.ll
> >> > >>     llvm/trunk/test/CodeGen/Thumb/dyn-stackalloc.ll
> >> > >>     llvm/trunk/test/CodeGen/Thumb/thumb-ldm.ll
> >> > >>     llvm/trunk/test/CodeGen/Thumb/thumb-memcpy-ldm-stm.ll
> >> > >>
> >> > >> Modified: llvm/trunk/lib/Target/ARM/ARMTargetMachine.cpp
> >> > >> URL:
> >> > >>
> >> > >>
> http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/ARM/ARMTargetMachine.cpp?rev=210789&r1=210788&r2=210789&view=diff
> >> > >>
> >> > >>
> >> > >>
> ==============================================================================
> >> > >> --- llvm/trunk/lib/Target/ARM/ARMTargetMachine.cpp (original)
> >> > >> +++ llvm/trunk/lib/Target/ARM/ARMTargetMachine.cpp Thu Jun 12
> >> > >> 10:18:33
> >> > >> 2014
> >> > >> @@ -265,7 +265,8 @@ bool ARMPassConfig::addInstSelector() {
> >> > >>  }
> >> > >>
> >> > >>  bool ARMPassConfig::addPreRegAlloc() {
> >> > >> -  if (getOptLevel() != CodeGenOpt::None)
> >> > >> +  // FIXME: Temporarily disabling Thumb-1 pre-RA Load/Store
> >> > >> optimization
> >> > >> pass
> >> > >> +  if (getOptLevel() != CodeGenOpt::None &&
> >> > >> !getARMSubtarget().isThumb1Only())
> >> > >>      addPass(createARMLoadStoreOptimizationPass(true));
> >> > >>    if (getOptLevel() != CodeGenOpt::None &&
> >> > >> getARMSubtarget().isCortexA9())
> >> > >>      addPass(createMLxExpansionPass());
> >> > >> @@ -280,8 +281,11 @@ bool ARMPassConfig::addPreRegAlloc() {
> >> > >>
> >> > >>  bool ARMPassConfig::addPreSched2() {
> >> > >>    if (getOptLevel() != CodeGenOpt::None) {
> >> > >> -    addPass(createARMLoadStoreOptimizationPass());
> >> > >> -    printAndVerify("After ARM load / store optimizer");
> >> > >> +    // FIXME: Temporarily disabling Thumb-1 post-RA Load/Store
> >> > >> optimization pass
> >> > >> +    if (!getARMSubtarget().isThumb1Only()) {
> >> > >> +      addPass(createARMLoadStoreOptimizationPass());
> >> > >> +      printAndVerify("After ARM load / store optimizer");
> >> > >> +    }
> >> > >>
> >> > >>      if (getARMSubtarget().hasNEON())
> >> > >>
>  addPass(createExecutionDependencyFixPass(&ARM::DPRRegClass));
> >> > >>
> >> > >> Modified:
> >> > >> llvm/trunk/test/CodeGen/Thumb/2014-06-10-thumb1-ldst-opt-bug.ll
> >> > >> URL:
> >> > >>
> >> > >>
> http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/Thumb/2014-06-10-thumb1-ldst-opt-bug.ll?rev=210789&r1=210788&r2=210789&view=diff
> >> > >>
> >> > >>
> >> > >>
> ==============================================================================
> >> > >> --- llvm/trunk/test/CodeGen/Thumb/2014-06-10-thumb1-ldst-opt-bug.ll
> >> > >> (original)
> >> > >> +++ llvm/trunk/test/CodeGen/Thumb/2014-06-10-thumb1-ldst-opt-bug.ll
> >> > >> Thu
> >> > >> Jun 12 10:18:33 2014
> >> > >> @@ -1,4 +1,5 @@
> >> > >>  ; RUN: llc < %s -mtriple=thumbv6m-eabi -o - | FileCheck %s
> >> > >> +; XFAIL: *
> >> > >>
> >> > >>  define void @foo(i32* %A) #0 {
> >> > >>  entry:
> >> > >>
> >> > >> Modified: llvm/trunk/test/CodeGen/Thumb/dyn-stackalloc.ll
> >> > >> URL:
> >> > >>
> >> > >>
> http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/Thumb/dyn-stackalloc.ll?rev=210789&r1=210788&r2=210789&view=diff
> >> > >>
> >> > >>
> >> > >>
> ==============================================================================
> >> > >> --- llvm/trunk/test/CodeGen/Thumb/dyn-stackalloc.ll (original)
> >> > >> +++ llvm/trunk/test/CodeGen/Thumb/dyn-stackalloc.ll Thu Jun 12
> >> > >> 10:18:33
> >> > >> 2014
> >> > >> @@ -1,5 +1,5 @@
> >> > >> -; RUN: llc < %s -mtriple=thumb-apple-darwin
> -disable-cgp-branch-opts
> >> > >> -disable-post-ra | FileCheck %s -check-prefix=CHECK
> >> > >> -check-prefix=RA_GREEDY
> >> > >> -; RUN: llc < %s -mtriple=thumb-apple-darwin
> -disable-cgp-branch-opts
> >> > >> -disable-post-ra -regalloc=basic | FileCheck %s -check-prefix=CHECK
> >> > >> -check-prefix=RA_BASIC
> >> > >> +; RUN: llc < %s -mtriple=thumb-apple-darwin
> -disable-cgp-branch-opts
> >> > >> -disable-post-ra | FileCheck %s
> >> > >> +; RUN: llc < %s -mtriple=thumb-apple-darwin
> -disable-cgp-branch-opts
> >> > >> -disable-post-ra -regalloc=basic | FileCheck %s
> >> > >>
> >> > >>         %struct.state = type { i32, %struct.info*, float**, i32,
> i32,
> >> > >> i32,
> >> > >> i32, i32, i32, i32, i32, i32, i64, i64, i64, i64, i64, i64, i8* }
> >> > >>         %struct.info = type { i32, i32, i32, i32, i32, i32, i32,
> i8*
> >> > >> }
> >> > >> @@ -45,8 +45,7 @@ define void @t2(%struct.comment* %vc, i8
> >> > >>  ; CHECK: sub sp, #
> >> > >>  ; CHECK: mov r[[R0:[0-9]+]], sp
> >> > >>  ; CHECK: str r{{[0-9+]}}, [r[[R0]]
> >> > >> -; RA_GREEDY: str r{{[0-9+]}}, [r[[R0]]
> >> > >> -; RA_BASIC: stm r[[R0]]!
> >> > >> +; CHECK: str r{{[0-9+]}}, [r[[R0]]
> >> > >>  ; CHECK-NOT: ldr r0, [sp
> >> > >>  ; CHECK: mov r[[R1:[0-9]+]], sp
> >> > >>  ; CHECK: subs r[[R2:[0-9]+]], r[[R1]], r{{[0-9]+}}
> >> > >>
> >> > >> Modified: llvm/trunk/test/CodeGen/Thumb/thumb-ldm.ll
> >> > >> URL:
> >> > >>
> >> > >>
> http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/Thumb/thumb-ldm.ll?rev=210789&r1=210788&r2=210789&view=diff
> >> > >>
> >> > >>
> >> > >>
> ==============================================================================
> >> > >> --- llvm/trunk/test/CodeGen/Thumb/thumb-ldm.ll (original)
> >> > >> +++ llvm/trunk/test/CodeGen/Thumb/thumb-ldm.ll Thu Jun 12 10:18:33
> >> > >> 2014
> >> > >> @@ -1,4 +1,5 @@
> >> > >>  ; RUN: llc < %s -mtriple=thumbv6m-eabi -o - | FileCheck %s
> >> > >> +; XFAIL: *
> >> > >>
> >> > >>  @X = external global [0 x i32]          ; <[0 x i32]*> [#uses=5]
> >> > >>
> >> > >>
> >> > >> Modified: llvm/trunk/test/CodeGen/Thumb/thumb-memcpy-ldm-stm.ll
> >> > >> URL:
> >> > >>
> >> > >>
> http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/Thumb/thumb-memcpy-ldm-stm.ll?rev=210789&r1=210788&r2=210789&view=diff
> >> > >>
> >> > >>
> >> > >>
> ==============================================================================
> >> > >> --- llvm/trunk/test/CodeGen/Thumb/thumb-memcpy-ldm-stm.ll
> (original)
> >> > >> +++ llvm/trunk/test/CodeGen/Thumb/thumb-memcpy-ldm-stm.ll Thu Jun
> 12
> >> > >> 10:18:33 2014
> >> > >> @@ -1,4 +1,5 @@
> >> > >>  ; RUN: llc -mtriple=thumbv6m-eabi %s -o - | FileCheck %s
> >> > >> +; XFAIL: *
> >> > >>
> >> > >>  @d = external global [64 x i32]
> >> > >>  @s = external global [64 x i32]
> >> > >>
> >> > >>
> >> > >> _______________________________________________
> >> > >> llvm-commits mailing list
> >> > >> llvm-commits at cs.uiuc.edu
> >> > >> http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits
> >> > >
> >> > >
> >> > > _______________________________________________
> >> > > llvm-commits mailing list
> >> > > llvm-commits at cs.uiuc.edu
> >> > > http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits
> >> > >
> >>
> >>
> >> _______________________________________________
> >> llvm-commits mailing list
> >> llvm-commits at cs.uiuc.edu
> >> http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits
> >>
> >
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/llvm-commits/attachments/20140616/ec6968b8/attachment.html>

More information about the llvm-commits mailing list