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Re: [Tinycc-devel] Jupm Optimizations regession bug
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From: |
Michael Matz |
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Subject: |
Re: [Tinycc-devel] Jupm Optimizations regession bug |
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Date: |
Wed, 3 Feb 2021 04:42:20 +0100 (CET) |
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User-agent: |
Alpine 2.21 (LSU 202 2017-01-01) |
Hello,
On Tue, 2 Feb 2021, Kyryl Melekhin wrote:
Hello Grischka and Tcc community,
I have found a regression bug in Tcc code gen (X86_64).
Caused by this commit: 8227db3a23fd3cf11840eaa25eab5f3f5f813ac7
This may have triggered the problem, but I think only by chance. The bug
is really in the VLA save/restore tracking. I've fixed it in
https://repo.or.cz/tinycc.git/commitdiff/fbef90a7039 .
Sadly I don't have a small test case to reproduce it.
See the testcase I've added in above commit. It shows the problematic
situation, mimicing the one in your vi.c (nice thing, that :) ).
Many thanks for the report.
Ciao,
Michael.