[llvm] Reapply "[DFAJumpThreading] Enable DFAJumpThread by default." (PR #169183)

[Usman Nadeem via llvm-commits]

https://github.com/UsmanNadeem created https://github.com/llvm/llvm-project/pull/169183

None

>From 1f865eb8642ca56168a12ef4fad250788082b8c1 Mon Sep 17 00:00:00 2001
From: Usman Nadeem <mnadeem at qti.qualcomm.com>
Date: Sat, 22 Nov 2025 11:02:31 -0800
Subject: [PATCH] Revert "Revert "[DFAJumpThreading] Enable DFAJumpThread by
 default." (#167352)"

This reverts commit 7e043364cf1f267380b2be955901b28ede9ca8eb.
---
 llvm/lib/Passes/PassBuilderPipelines.cpp                      | 2 +-
 llvm/test/Other/new-pm-defaults.ll                            | 1 +
 llvm/test/Other/new-pm-thinlto-postlink-defaults.ll           | 1 +
 llvm/test/Other/new-pm-thinlto-postlink-pgo-defaults.ll       | 1 +
 llvm/test/Other/new-pm-thinlto-postlink-samplepgo-defaults.ll | 1 +
 llvm/test/Other/new-pm-thinlto-prelink-defaults.ll            | 1 +
 llvm/test/Other/new-pm-thinlto-prelink-pgo-defaults.ll        | 1 +
 llvm/test/Other/new-pm-thinlto-prelink-samplepgo-defaults.ll  | 1 +
 8 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/llvm/lib/Passes/PassBuilderPipelines.cpp b/llvm/lib/Passes/PassBuilderPipelines.cpp
index dd73c04959732..2fe963b3b68d9 100644
--- a/llvm/lib/Passes/PassBuilderPipelines.cpp
+++ b/llvm/lib/Passes/PassBuilderPipelines.cpp
@@ -228,7 +228,7 @@ static cl::opt<bool> EnableLoopHeaderDuplication(
 static cl::opt<bool>
     EnableDFAJumpThreading("enable-dfa-jump-thread",
                            cl::desc("Enable DFA jump threading"),
-                           cl::init(false), cl::Hidden);
+                           cl::init(true), cl::Hidden);
 
 static cl::opt<bool>
     EnableHotColdSplit("hot-cold-split",
diff --git a/llvm/test/Other/new-pm-defaults.ll b/llvm/test/Other/new-pm-defaults.ll
index 1f437a662cc96..b59d4cf6af998 100644
--- a/llvm/test/Other/new-pm-defaults.ll
+++ b/llvm/test/Other/new-pm-defaults.ll
@@ -208,6 +208,7 @@
 ; CHECK-O-NEXT: Running analysis: DemandedBitsAnalysis
 ; CHECK-O-NEXT: Running pass: InstCombinePass
 ; CHECK-EP-PEEPHOLE-NEXT: Running pass: NoOpFunctionPass
+; CHECK-O23SZ-NEXT: Running pass: DFAJumpThreadingPass
 ; CHECK-O23SZ-NEXT: Running pass: JumpThreadingPass
 ; CHECK-O23SZ-NEXT: Running analysis: LazyValueAnalysis
 ; CHECK-O23SZ-NEXT: Running pass: CorrelatedValuePropagationPass
diff --git a/llvm/test/Other/new-pm-thinlto-postlink-defaults.ll b/llvm/test/Other/new-pm-thinlto-postlink-defaults.ll
index 2d8b8f1b22091..c1d8b42505c84 100644
--- a/llvm/test/Other/new-pm-thinlto-postlink-defaults.ll
+++ b/llvm/test/Other/new-pm-thinlto-postlink-defaults.ll
@@ -133,6 +133,7 @@
 ; CHECK-O-NEXT: Running pass: BDCEPass
 ; CHECK-O-NEXT: Running analysis: DemandedBitsAnalysis
 ; CHECK-O-NEXT: Running pass: InstCombinePass
+; CHECK-O23SZ-NEXT: Running pass: DFAJumpThreadingPass
 ; CHECK-O23SZ-NEXT: Running pass: JumpThreadingPass
 ; CHECK-O23SZ-NEXT: Running analysis: LazyValueAnalysis
 ; CHECK-O23SZ-NEXT: Running pass: CorrelatedValuePropagationPass
diff --git a/llvm/test/Other/new-pm-thinlto-postlink-pgo-defaults.ll b/llvm/test/Other/new-pm-thinlto-postlink-pgo-defaults.ll
index 7cacc17c7ab9a..45f090252eaf7 100644
--- a/llvm/test/Other/new-pm-thinlto-postlink-pgo-defaults.ll
+++ b/llvm/test/Other/new-pm-thinlto-postlink-pgo-defaults.ll
@@ -118,6 +118,7 @@
 ; CHECK-O-NEXT: Running pass: BDCEPass
 ; CHECK-O-NEXT: Running analysis: DemandedBitsAnalysis
 ; CHECK-O-NEXT: Running pass: InstCombinePass
+; CHECK-O23SZ-NEXT: Running pass: DFAJumpThreadingPass
 ; CHECK-O23SZ-NEXT: Running pass: JumpThreadingPass
 ; CHECK-O23SZ-NEXT: Running analysis: LazyValueAnalysis
 ; CHECK-O23SZ-NEXT: Running pass: CorrelatedValuePropagationPass
diff --git a/llvm/test/Other/new-pm-thinlto-postlink-samplepgo-defaults.ll b/llvm/test/Other/new-pm-thinlto-postlink-samplepgo-defaults.ll
index ef6cd8354ae3d..4c330f44d30cc 100644
--- a/llvm/test/Other/new-pm-thinlto-postlink-samplepgo-defaults.ll
+++ b/llvm/test/Other/new-pm-thinlto-postlink-samplepgo-defaults.ll
@@ -127,6 +127,7 @@
 ; CHECK-O-NEXT: Running pass: BDCEPass
 ; CHECK-O-NEXT: Running analysis: DemandedBitsAnalysis
 ; CHECK-O-NEXT: Running pass: InstCombinePass
+; CHECK-O23SZ-NEXT: Running pass: DFAJumpThreadingPass
 ; CHECK-O23SZ-NEXT: Running pass: JumpThreadingPass
 ; CHECK-O23SZ-NEXT: Running analysis: LazyValueAnalysis
 ; CHECK-O23SZ-NEXT: Running pass: CorrelatedValuePropagationPass
diff --git a/llvm/test/Other/new-pm-thinlto-prelink-defaults.ll b/llvm/test/Other/new-pm-thinlto-prelink-defaults.ll
index dd6acd2c51ee7..b61edc805108d 100644
--- a/llvm/test/Other/new-pm-thinlto-prelink-defaults.ll
+++ b/llvm/test/Other/new-pm-thinlto-prelink-defaults.ll
@@ -165,6 +165,7 @@
 ; CHECK-O-NEXT: Running pass: BDCEPass
 ; CHECK-O-NEXT: Running analysis: DemandedBitsAnalysis
 ; CHECK-O-NEXT: Running pass: InstCombinePass
+; CHECK-O23SZ-NEXT: Running pass: DFAJumpThreadingPass
 ; CHECK-O23SZ-NEXT: Running pass: JumpThreadingPass
 ; CHECK-O23SZ-NEXT: Running analysis: LazyValueAnalysis
 ; CHECK-O23SZ-NEXT: Running pass: CorrelatedValuePropagationPass
diff --git a/llvm/test/Other/new-pm-thinlto-prelink-pgo-defaults.ll b/llvm/test/Other/new-pm-thinlto-prelink-pgo-defaults.ll
index ee054527e20bd..acf8c053d0f82 100644
--- a/llvm/test/Other/new-pm-thinlto-prelink-pgo-defaults.ll
+++ b/llvm/test/Other/new-pm-thinlto-prelink-pgo-defaults.ll
@@ -167,6 +167,7 @@
 ; CHECK-O-NEXT: Running pass: BDCEPass
 ; CHECK-O-NEXT: Running analysis: DemandedBitsAnalysis
 ; CHECK-O-NEXT: Running pass: InstCombinePass
+; CHECK-O23SZ-NEXT: Running pass: DFAJumpThreadingPass
 ; CHECK-O23SZ-NEXT: Running pass: JumpThreadingPass
 ; CHECK-O23SZ-NEXT: Running analysis: LazyValueAnalysis
 ; CHECK-O23SZ-NEXT: Running pass: CorrelatedValuePropagationPass
diff --git a/llvm/test/Other/new-pm-thinlto-prelink-samplepgo-defaults.ll b/llvm/test/Other/new-pm-thinlto-prelink-samplepgo-defaults.ll
index fd95e94f3c8b9..6b3c5ca7605de 100644
--- a/llvm/test/Other/new-pm-thinlto-prelink-samplepgo-defaults.ll
+++ b/llvm/test/Other/new-pm-thinlto-prelink-samplepgo-defaults.ll
@@ -131,6 +131,7 @@
 ; CHECK-O-NEXT: Running pass: BDCEPass
 ; CHECK-O-NEXT: Running analysis: DemandedBitsAnalysis
 ; CHECK-O-NEXT: Running pass: InstCombinePass
+; CHECK-O23SZ-NEXT: Running pass: DFAJumpThreadingPass
 ; CHECK-O23SZ-NEXT: Running pass: JumpThreadingPass
 ; CHECK-O23SZ-NEXT: Running analysis: LazyValueAnalysis
 ; CHECK-O23SZ-NEXT: Running pass: CorrelatedValuePropagationPass