[all-commits] [llvm/llvm-project] 3479c5: PowerPC32:PIC: Update to bcl to fix branch predict...

[Lei Huang via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 3479c574667eec375cc4ed91e0d63aa2d408b62c
      https://github.com/llvm/llvm-project/commit/3479c574667eec375cc4ed91e0d63aa2d408b62c
  Author: Lei Huang <lei at ca.ibm.com>
  Date:   2025-04-07 (Mon, 07 Apr 2025)

  Changed paths:
    M llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp
    M llvm/test/CodeGen/PowerPC/mcm-5.ll
    A llvm/test/CodeGen/PowerPC/ppc32-pic-bcl.ll
    M llvm/test/CodeGen/PowerPC/ppc32-pic-large.ll
    M llvm/test/CodeGen/PowerPC/ppc32-pic.ll

  Log Message:
  -----------
  PowerPC32:PIC: Update to bcl to fix branch prediction mis-predict issue (#134140)

Update `bl` to `bcl 20, 31, .+4` for 32bit PIC code gen so the link
stack is 
not corrupted and cause mis-predict for the branch predictor.

fixes: https://github.com/llvm/llvm-project/issues/128644



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