https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123960
Bug ID: 123960
Summary: Incorrect pointer address calculation on x64.
Product: gcc
Version: 15.2.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: sz.tarnowski at gmail dot com
Target Milestone: ---
Created attachment 63577
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=63577&action=edit
example code
Following code leads to Segmentation fault due to incorrect calculation during
operation on pointer.
ptr = memory + -((unsigned int)*ptr);
Works perfect when improved to:
ptr = memory -((unsigned int)*ptr);
This code was generated by Ghidra as part of assembly code intepretation.
The result is unexpected "roll-over" on 32 bit (lowest bit of high 32b word).
Sample result of attached example.
0x55f13fb78310 allocated
0x55f13fb78311 incremented
0x55f23fb78310 after magic
