[llvm] [SystemZ] Remove getInliningThresholdMultiplier() override (PR #94612)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-backend-systemz

Author: Nikita Popov (nikic)

<details>
<summary>Changes</summary>

Using this TTI hook is only appropriate for GPU targets that need to maximally flatten all functions.

The inlining threshold multiplier should not be increased for ordinary targets -- while this may increase benchmark scores, it can also result in large code size increases and runaway inlining, resulting in build OOM/timeouts.

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Full diff: https://github.com/llvm/llvm-project/pull/94612.diff


1 Files Affected:

- (modified) llvm/lib/Target/SystemZ/SystemZTargetTransformInfo.h (-1) 


``````````diff
diff --git a/llvm/lib/Target/SystemZ/SystemZTargetTransformInfo.h b/llvm/lib/Target/SystemZ/SystemZTargetTransformInfo.h
index 3cf4a69ac2818..18effe6950e6c 100644
--- a/llvm/lib/Target/SystemZ/SystemZTargetTransformInfo.h
+++ b/llvm/lib/Target/SystemZ/SystemZTargetTransformInfo.h
@@ -38,7 +38,6 @@ class SystemZTTIImpl : public BasicTTIImplBase<SystemZTTIImpl> {
   /// \name Scalar TTI Implementations
   /// @{
 
-  unsigned getInliningThresholdMultiplier() const { return 3; }
   unsigned adjustInliningThreshold(const CallBase *CB) const;
 
   InstructionCost getIntImmCost(const APInt &Imm, Type *Ty,

``````````

</details>


https://github.com/llvm/llvm-project/pull/94612