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<div class="moz-cite-prefix">r284993.<br>
<br>
-Eli<br>
<br>
On 10/24/2016 10:22 AM, James Molloy wrote:<br>
</div>
<blockquote
cite="mid:CALCTSA2U-js-COSzebh_r2Z6eoX1u1Kfnf3Cyy0TYyb7_SRp8g@mail.gmail.com"
type="cite">Hi Eli, <br>
<br>
Sorry about that! I'm on vacation for a few days with no SVN
access- if it's blocking you please feel free to revert and I'll
look at it on Thursday. <br>
<br>
Thanks,<br>
<br>
James<br>
<div class="gmail_quote">
<div dir="ltr">On Mon, 24 Oct 2016 at 19:20, Friedman, Eli via
llvm-commits <<a moz-do-not-send="true"
href="mailto:llvm-commits@lists.llvm.org">llvm-commits@lists.llvm.org</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">On
10/22/2016 2:58 AM, James Molloy via llvm-commits wrote:<br
class="gmail_msg">
> Author: jamesm<br class="gmail_msg">
> Date: Sat Oct 22 04:58:37 2016<br class="gmail_msg">
> New Revision: 284917<br class="gmail_msg">
><br class="gmail_msg">
> URL: <a moz-do-not-send="true"
href="http://llvm.org/viewvc/llvm-project?rev=284917&view=rev"
rel="noreferrer" class="gmail_msg" target="_blank">http://llvm.org/viewvc/llvm-project?rev=284917&view=rev</a><br
class="gmail_msg">
> Log:<br class="gmail_msg">
> [ARM] Fix crash in ConstantIslands<br class="gmail_msg">
><br class="gmail_msg">
> tPCRelJT may not be the first instruction in a block.
Check that instead of dereferencing a broken iterator.<br
class="gmail_msg">
<br class="gmail_msg">
Thanks for the fix... but this exposes more problems.<br
class="gmail_msg">
<br class="gmail_msg">
It looks like the jump tables being generated by this
optimization<br class="gmail_msg">
aren't properly aligned; with -no-integrated-as, I'm getting
errors like<br class="gmail_msg">
"Error: invalid immediate for address calculation (value =<br
class="gmail_msg">
0x00000006)". I haven't reduced a testcase yet, but it's
triggering on<br class="gmail_msg">
a bunch of SPEC tests, so it shouldn't be hard to reproduce.<br
class="gmail_msg">
<br class="gmail_msg">
-Eli<br class="gmail_msg">
<br class="gmail_msg">
<br class="gmail_msg">
><br class="gmail_msg">
> Added:<br class="gmail_msg">
> llvm/trunk/test/CodeGen/ARM/constant-island-crash.ll<br
class="gmail_msg">
> Modified:<br class="gmail_msg">
> llvm/trunk/lib/Target/ARM/ARMConstantIslandPass.cpp<br
class="gmail_msg">
><br class="gmail_msg">
> Modified:
llvm/trunk/lib/Target/ARM/ARMConstantIslandPass.cpp<br
class="gmail_msg">
> URL: <a moz-do-not-send="true"
href="http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/ARM/ARMConstantIslandPass.cpp?rev=284917&r1=284916&r2=284917&view=diff"
rel="noreferrer" class="gmail_msg" target="_blank">http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/ARM/ARMConstantIslandPass.cpp?rev=284917&r1=284916&r2=284917&view=diff</a><br
class="gmail_msg">
>
==============================================================================<br
class="gmail_msg">
> --- llvm/trunk/lib/Target/ARM/ARMConstantIslandPass.cpp
(original)<br class="gmail_msg">
> +++ llvm/trunk/lib/Target/ARM/ARMConstantIslandPass.cpp
Sat Oct 22 04:58:37 2016<br class="gmail_msg">
> @@ -2048,7 +2048,9 @@ bool
ARMConstantIslands::optimizeThumb2J<br class="gmail_msg">
> // %base = tLEApcrelJT<br class="gmail_msg">
> // %t = tLDRr %idx, %base<br class="gmail_msg">
> unsigned BaseReg =
User.MI->getOperand(0).getReg();<br class="gmail_msg">
> -<br class="gmail_msg">
> +<br class="gmail_msg">
> + if (User.MI->getIterator() ==
User.MI->getParent()->begin())<br class="gmail_msg">
> + continue;<br class="gmail_msg">
> MachineInstr *Shift = User.MI->getPrevNode();<br
class="gmail_msg">
> if (Shift->getOpcode() != ARM::tLSLri ||<br
class="gmail_msg">
> Shift->getOperand(3).getImm() != 2 ||<br
class="gmail_msg">
><br class="gmail_msg">
> Added:
llvm/trunk/test/CodeGen/ARM/constant-island-crash.ll<br
class="gmail_msg">
> URL: <a moz-do-not-send="true"
href="http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/ARM/constant-island-crash.ll?rev=284917&view=auto"
rel="noreferrer" class="gmail_msg" target="_blank">http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/ARM/constant-island-crash.ll?rev=284917&view=auto</a><br
class="gmail_msg">
>
==============================================================================<br
class="gmail_msg">
> --- llvm/trunk/test/CodeGen/ARM/constant-island-crash.ll
(added)<br class="gmail_msg">
> +++ llvm/trunk/test/CodeGen/ARM/constant-island-crash.ll
Sat Oct 22 04:58:37 2016<br class="gmail_msg">
> @@ -0,0 +1,43 @@<br class="gmail_msg">
> +; RUN: llc < %s<br class="gmail_msg">
> +; No FileCheck - testing for crash.<br class="gmail_msg">
> +<br class="gmail_msg">
> +target datalayout =
"e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"<br
class="gmail_msg">
> +target triple = "thumbv5e-none-linux-gnueabi"<br
class="gmail_msg">
> +<br class="gmail_msg">
> +%struct.blam = type { [4 x %struct.eggs], [6 x [15 x
i16]], [6 x i32], i32, i32, i32, i32, i32, i32, %struct.eggs,
[4 x %struct.eggs], [4 x %struct.eggs], [4 x i32], i32, i32,
i32, [4 x %struct.eggs], [4 x %struct.eggs], i32,
%struct.eggs, i32 }<br class="gmail_msg">
> +%struct.eggs = type { i32, i32 }<br class="gmail_msg">
> +<br class="gmail_msg">
> +define void @spam(%struct.blam* %arg, i32 %arg1) {<br
class="gmail_msg">
> +bb:<br class="gmail_msg">
> + %tmp = getelementptr inbounds %struct.blam,
%struct.blam* %arg, i32 undef, i32 2, i32 %arg1<br
class="gmail_msg">
> + switch i32 %arg1, label %bb8 [<br class="gmail_msg">
> + i32 0, label %bb2<br class="gmail_msg">
> + i32 1, label %bb3<br class="gmail_msg">
> + i32 2, label %bb4<br class="gmail_msg">
> + i32 3, label %bb5<br class="gmail_msg">
> + i32 4, label %bb6<br class="gmail_msg">
> + i32 5, label %bb7<br class="gmail_msg">
> + ]<br class="gmail_msg">
> +<br class="gmail_msg">
> +bb2: ;
preds = %bb<br class="gmail_msg">
> + unreachable<br class="gmail_msg">
> +<br class="gmail_msg">
> +bb3: ;
preds = %bb<br class="gmail_msg">
> + unreachable<br class="gmail_msg">
> +<br class="gmail_msg">
> +bb4: ;
preds = %bb<br class="gmail_msg">
> + unreachable<br class="gmail_msg">
> +<br class="gmail_msg">
> +bb5: ;
preds = %bb<br class="gmail_msg">
> + unreachable<br class="gmail_msg">
> +<br class="gmail_msg">
> +bb6: ;
preds = %bb<br class="gmail_msg">
> + unreachable<br class="gmail_msg">
> +<br class="gmail_msg">
> +bb7: ;
preds = %bb<br class="gmail_msg">
> + unreachable<br class="gmail_msg">
> +<br class="gmail_msg">
> +bb8: ;
preds = %bb<br class="gmail_msg">
> + store i32 1, i32* %tmp, align 4<br class="gmail_msg">
> + unreachable<br class="gmail_msg">
> +}<br class="gmail_msg">
><br class="gmail_msg">
><br class="gmail_msg">
> _______________________________________________<br
class="gmail_msg">
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class="gmail_msg">
<br class="gmail_msg">
--<br class="gmail_msg">
Employee of Qualcomm Innovation Center, Inc.<br
class="gmail_msg">
Qualcomm Innovation Center, Inc. is a member of Code Aurora
Forum, a Linux Foundation Collaborative Project<br
class="gmail_msg">
<br class="gmail_msg">
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</blockquote>
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</blockquote>
<br>
<p><br>
</p>
<pre class="moz-signature" cols="72">--
Employee of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project</pre>
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