[AArch64] Lower jump table cases threshold to 10 #143632
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@llvm/pr-subscribers-backend-aarch64 Author: Guy David (guy-david) ChangesPrevious stabs at this setting (#71166) hypertuned it for SPEC2017, but Clang's own compilation can benefit from a slightly lower threshold, yielding a 0.3% improvement in compile time, while still not regressing SPEC. Most notable benefactors of this change are:
Test Suite: Full diff: https://github.com/llvm/llvm-project/pull/143632.diff 1 Files Affected:
diff --git a/llvm/lib/Target/AArch64/AArch64Subtarget.cpp b/llvm/lib/Target/AArch64/AArch64Subtarget.cpp
index a28e6bad0dca0..68ed10570a52f 100644
--- a/llvm/lib/Target/AArch64/AArch64Subtarget.cpp
+++ b/llvm/lib/Target/AArch64/AArch64Subtarget.cpp
@@ -73,7 +73,7 @@ static cl::opt<AArch64PAuth::AuthCheckMethod>
cl::values(AUTH_CHECK_METHOD_CL_VALUES_LR));
static cl::opt<unsigned> AArch64MinimumJumpTableEntries(
- "aarch64-min-jump-table-entries", cl::init(13), cl::Hidden,
+ "aarch64-min-jump-table-entries", cl::init(10), cl::Hidden,
cl::desc("Set minimum number of entries to use a jump table on AArch64"));
static cl::opt<unsigned> AArch64StreamingHazardSize(
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Previous stabs at this setting hypertuned it for SPEC2017, but Clang's own compilation can benefit from a slightly lower threshold, yielding a 0.3% improvement in compile time, while still not regressing SPEC. Most notable benefactors of this change are: - llvm::Instruction::getNumSuccessors (11 cases) - llvm::Instruction::getSuccessor (11 cases)
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david-arm
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Jun 18, 2025
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LLVM Buildbot has detected a new failure on builder Full details are available at: https://lab.llvm.org/buildbot/#/builders/162/builds/24866 Here is the relevant piece of the build log for the reference |
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Previous stabs at this setting (#71166) hypertuned it for SPEC2017, but Clang's own compilation can benefit from a slightly lower threshold, yielding a 0.3% improvement in compile time, while still not regressing SPEC.
Most notable beneficiaries of this change are:
llvm::Instruction::getNumSuccessors(11 cases)llvm::Instruction::getSuccessor(11 cases)Test Suite with a bootstrapped build: