[all-commits] [llvm/llvm-project] 2bf473: [GlobalOpt] Don't query TTI on a llvm.memcpy decla...

[Craig Topper via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 2bf473bd546e65f8fc2f0d5006b8c8ef07259e24
      https://github.com/llvm/llvm-project/commit/2bf473bd546e65f8fc2f0d5006b8c8ef07259e24
  Author: Craig Topper <craig.topper at sifive.com>
  Date:   2025-02-19 (Wed, 19 Feb 2025)

  Changed paths:
    M llvm/lib/Transforms/IPO/GlobalOpt.cpp

  Log Message:
  -----------
  [GlobalOpt] Don't query TTI on a llvm.memcpy declaration. (#127760)

Querying TTI creates a Subtarget object, but an llvm.memcpy declaration
doesn't have target-cpu and target-feature attributes like functions
with definitions. This can cause a warning to be printed on RISC-V
because the target-abi in the Module requires floating point, but the
subtarget features don't enable floating point. So far we've only seen
this in LTO when an -mcpu is not supplied for the TargetMachine.

To fix this, get TTI for the calling function instead.

Fixes the issue reported here
https://github.com/llvm/llvm-project/issues/69780#issuecomment-2665273161



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