[all-commits] [llvm/llvm-project] 3fd4d1: [BOLT][ICP] Use PC-relative instructions for x86 P...

[Jinjie Huang via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 3fd4d1fa4ddfc9aca3522c58247962eeb8f21cd8
      https://github.com/llvm/llvm-project/commit/3fd4d1fa4ddfc9aca3522c58247962eeb8f21cd8
  Author: Jinjie Huang <huangjinjie at bytedance.com>
  Date:   2026-09-10 (Thu, 10 Sep 2026)

  Changed paths:
    M bolt/lib/Target/X86/X86MCPlusBuilder.cpp
    A bolt/test/X86/icp-pic.s

  Log Message:
  -----------
  [BOLT][ICP] Use PC-relative instructions for x86 PIC binaries in ICP (#216587)

Currently, BOLT x86 ICP optimization inserts an immediate-to-register
comparison instruction, which forces the use of 32-bit signed (32S)
relocations due to ABI limitations. This behavior does not align well
with the conventions of PIC/PIE binaries and **makes it highly prone to
JITLink relocation overflow errors when dealing with large binaries.**

Therefore, this patch introduces an additional lea instruction for the
x86 architecture to leverage PC-relative (32PC) addressing. This change
is intended to apply by default to PIC binaries, or when specific
options are provided.



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