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Date: Mon, 21 Mar 2022 08:12:25 +0100 (CET)
From: Richard Biener <rguenther@suse.de>
To: gcc-patches@gcc.gnu.org
cc: Roger Sayle <roger@eyesopen.com>
Subject: Re: [r12-7687 Regression] FAIL: gcc.target/i386/bt-5.c
 scan-assembler-times bt[lq][ \t] 7 on Linux/x86_64
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On Thu, 17 Mar 2022, sunil.k.pandey wrote:

> On Linux/x86_64,
> 
> 3a7ba8fd0cda387809e4902328af2473662b6a4a is the first bad commit
> commit 3a7ba8fd0cda387809e4902328af2473662b6a4a
> Author: Richard Biener <rguenther@suse.de>
> Date:   Thu Mar 17 08:10:59 2022 +0100
> 
>     tree-optimization/104960 - unsplit edges after late sinking
> 
> caused
> 
> FAIL: gcc.target/i386/bt-5.c scan-assembler-not sar[lq][ \t]
> FAIL: gcc.target/i386/bt-5.c scan-assembler-times bt[lq][ \t] 7

Btw, I've seen this as well and the "only" change is swapped edges
out of a conditional from the split/unsplit dance.  I was hoping
somebody more familiar with the change intruducing that testcase
was going to investigate but in the end it's probably RTL expansion
presenting slightly different RTL IL to ifcvt.

Richard.