Incorrect AMD Zen CPU core temps

[unlimitedsola]

Note: Contains AI generated content, all content has been reviewed and vetted by me.

Describe the bug

On AMD multi-CCD CPUs (e.g. Ryzen 5950X), btop++ incorrectly maps per-CCD temperature sensors to CPU cores. Tccd1 is shown for even-numbered cores (0, 2, 4, 6, ...) and Tccd2 for odd-numbered cores (1, 3, 5, 7, ...), when the correct mapping is Tccd1 → cores 0–7 (and their SMT siblings 16–23) and Tccd2 → cores 8–15 (and their SMT siblings 24–31).

The root cause is in get_core_mapping(): the code uses the physical core ID directly as a sensor index when it is smaller than the number of sensors, then cycles n++ through sensors for the rest — producing an alternating pattern instead of grouping cores by CCD.

To Reproduce

1. Run btop++ on a system with an AMD multi-CCD CPU (e.g. Ryzen 5900X, 5950X, Threadripper)
2. Enable core temperature display
3. Observe that the temperature displayed per-core alternates between two values rather than showing the same temperature for all cores within a physical CCD

Expected behavior

Cores belonging to the same CCD should all display the temperature from that CCD's sensor. For example, on a Ryzen 5950X:

• Cores 0–7 and 16–23 → Tccd1
• Cores 8–15 and 24–31 → Tccd2

Screenshots

Current (note that the core with 100% utilization is not reporting the correct temp):

Expected (will provide PR):

Info

• btop++ version:

  btop version: 1.4.6
  Compiled with: g++ (15.2.1)
  Configured with: make STATIC= GPU_SUPPORT=true RSMI_STATIC=
  

• Architecture: x86_64
• Platform: Arch Linux
• (Linux) Kernel: 6.19.8-arch1-1
• sensors output:

  k10temp-pci-00c3
  Adapter: PCI adapter
  Tctl:         +68.2°C
  Tccd1:        +50.8°C
  Tccd2:        +45.0°C
  

• lscpu output:

  Architecture:                x86_64
    CPU op-mode(s):            32-bit, 64-bit
    Address sizes:             48 bits physical, 48 bits virtual
    Byte Order:                Little Endian
  CPU(s):                      32
    On-line CPU(s) list:       0-31
  Vendor ID:                   AuthenticAMD
    Model name:                AMD Ryzen 9 5950X 16-Core Processor
      CPU family:              25
      Model:                   33
      Thread(s) per core:      2
      Core(s) per socket:      16
      Socket(s):               1
      Stepping:                0
      Frequency boost:         enabled
      CPU(s) scaling MHz:      63%
      CPU max MHz:             5086.1812
      CPU min MHz:             582.1540
      BogoMIPS:                6799.59
      Flags:                   <...>