[all-commits] [llvm/llvm-project] 391cbd: Reland [RISCV] Check SP-relative offset in needsFr...

[Garvit Gupta via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 391cbd232dfded7d9af778f9a1fdb04982a15a42
      https://github.com/llvm/llvm-project/commit/391cbd232dfded7d9af778f9a1fdb04982a15a42
  Author: Garvit Gupta <garvgupt at qti.qualcomm.com>
  Date:   2026-06-09 (Tue, 09 Jun 2026)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVRegisterInfo.cpp
    M llvm/test/CodeGen/RISCV/GlobalISel/vararg.ll
    M llvm/test/CodeGen/RISCV/local-stack-slot-allocation.ll

  Log Message:
  -----------
  Reland [RISCV] Check SP-relative offset in needsFrameBaseReg when FP offset overflows (#202499)

When a frame pointer is present, needsFrameBaseReg previously only
checked the FP-relative offset to decide if a virtual base register was
needed. If the worst-case FP offset exceeded the 12-bit immediate range,
a base register was always materialized, even when the SP-relative
offset would fit.

Since getFrameIndexReference can now select SP over FP when the offset
fits in the compressed instruction immediate range, also check the
SP-relative offset before deciding a base register is needed. This
avoids unnecessary base register materialization and results in some
code size savings.

Reland of b5d577d3faef.



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