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Re: [Tinycc-devel] Jupm Optimizations regession bug

From: Michael Matz
Subject: Re: [Tinycc-devel] Jupm Optimizations regession bug
Date: Wed, 3 Feb 2021 04:42:20 +0100 (CET)
User-agent: Alpine 2.21 (LSU 202 2017-01-01)


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.


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