llvm-project

626e2d23 - [AArch64] Avoid raw_svector_ostream for SubtargetMap keys (#196003)

[AArch64] Avoid raw_svector_ostream for SubtargetMap keys (#196003) AArch64TargetMachine::getSubtargetImpl builds a StringMap key on every subtarget lookup. This showed up through repeated TTI queries while profiling sqlite on aarch64-O0-g. Building the key directly with SmallString appends and utostr instead of raw_svector_ostream improves compile-time. We used to do this until 07e7168048b1. CTMark geomean: - stage1-aarch64-O3: -0.16% - stage1-aarch64-O0-g: -0.18% https://llvm-compile-time-tracker.com/compare.php?from=c9d713aa48a714d20b8502d06b9feb24829e6f22&to=e7ff83884193ee70cf3a69778b891fb729e0bcba&stat=instructions%3Au Assisted-by: codex