================
@@ -749,6 +749,11 @@ def TuningUseGLMDivSqrtCosts
: SubtargetFeature<"use-glm-div-sqrt-costs", "UseGLMDivSqrtCosts", "true",
"Use Goldmont specific floating point div/sqrt costs">;
+// Starting with Redwood Cove architecture, the branch has branch taken hint
+// (i.e., instruction prefix 3EH).
+def TuningBranchHint: SubtargetFeature<"branch-hint", "HasBranchHint", "true",
----------------
KanRobert wrote:
See Intel SDM
```
— Branch hints1:
• 2EH—Branch not taken (used only with Jcc instructions).
• 3EH—Branch taken (used only with Jcc instructions).
1. Some earlier microarchitectures used these as branch hints, but recent
generations have not and they are reserved for future hint usage.
```
https://github.com/llvm/llvm-project/pull/97721
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