[llvm] 13e62f0 - [LoopInterchange] Enable it by default (#124911)

[via llvm-commits]

Author: Sjoerd Meijer
Date: 2026-06-01T08:44:57+01:00
New Revision: 13e62f031fcfba57d525727e39e2e7e53c245435

URL: https://github.com/llvm/llvm-project/commit/13e62f031fcfba57d525727e39e2e7e53c245435
DIFF: https://github.com/llvm/llvm-project/commit/13e62f031fcfba57d525727e39e2e7e53c245435.diff

LOG: [LoopInterchange] Enable it by default (#124911)

This enables loop-interchange, which was first discussed here:
https://discourse.llvm.org/t/enabling-loop-interchange/82589

All bugs have been fixed, including DependenceAnalysis, and all
components have at least one maintainer; default enablement is
now meeting the requirements in the Developer's policy.

This has been a major effort by different people, many thanks to:
- Ryotaro Kasuga,
- Madhur Amilkanthwar,
- Sebastian Pop,
- Ehsan Amiri,
- Michael Kruse,
- Nikita Popov,
- Sjoerd Meijer.

Added: 
    

Modified: 
    llvm/lib/Passes/PassBuilderPipelines.cpp
    llvm/test/Other/new-pm-defaults.ll
    llvm/test/Other/new-pm-thinlto-postlink-defaults.ll
    llvm/test/Other/new-pm-thinlto-postlink-pgo-defaults.ll
    llvm/test/Other/new-pm-thinlto-postlink-samplepgo-defaults.ll

Removed: 
    


################################################################################
diff  --git a/llvm/lib/Passes/PassBuilderPipelines.cpp b/llvm/lib/Passes/PassBuilderPipelines.cpp
index b0dc4371bf321..174bda9fafff0 100644
--- a/llvm/lib/Passes/PassBuilderPipelines.cpp
+++ b/llvm/lib/Passes/PassBuilderPipelines.cpp
@@ -212,7 +212,7 @@ static cl::opt<bool> RunNewGVN("enable-newgvn", cl::init(false), cl::Hidden,
                                cl::desc("Run the NewGVN pass"));
 
 static cl::opt<bool>
-    EnableLoopInterchange("enable-loopinterchange", cl::init(false), cl::Hidden,
+    EnableLoopInterchange("enable-loopinterchange", cl::init(true), cl::Hidden,
                           cl::desc("Enable the LoopInterchange Pass"));
 
 static cl::opt<bool> EnableUnrollAndJam("enable-unroll-and-jam",

diff  --git a/llvm/test/Other/new-pm-defaults.ll b/llvm/test/Other/new-pm-defaults.ll
index 3a5ecc13ecc20..914c61110148c 100644
--- a/llvm/test/Other/new-pm-defaults.ll
+++ b/llvm/test/Other/new-pm-defaults.ll
@@ -242,6 +242,7 @@
 ; CHECK-O-NEXT: Running pass: LCSSAPass
 ; CHECK-O-NEXT: Running pass: LoopRotatePass
 ; CHECK-O-NEXT: Running pass: LoopDeletionPass
+; CHECK-O-NEXT: Running pass: LoopInterchange
 ; CHECK-O-NEXT: Running pass: LoopDistributePass
 ; CHECK-O-NEXT: Running analysis: LoopAccessAnalysis on foo
 ; CHECK-O-NEXT: Running pass: InjectTLIMappings

diff  --git a/llvm/test/Other/new-pm-thinlto-postlink-defaults.ll b/llvm/test/Other/new-pm-thinlto-postlink-defaults.ll
index c16ec4800b6bc..dbbd10eaa8775 100644
--- a/llvm/test/Other/new-pm-thinlto-postlink-defaults.ll
+++ b/llvm/test/Other/new-pm-thinlto-postlink-defaults.ll
@@ -169,6 +169,7 @@
 ; CHECK-POSTLINK-O-NEXT: Running pass: LCSSAPass
 ; CHECK-POSTLINK-O-NEXT: Running pass: LoopRotatePass
 ; CHECK-POSTLINK-O-NEXT: Running pass: LoopDeletionPass
+; CHECK-POSTLINK-O-NEXT: Running pass: LoopInterchangePass
 ; CHECK-POSTLINK-O-NEXT: Running pass: LoopDistributePass
 ; CHECK-POSTLINK-O-NEXT: Running analysis: LoopAccessAnalysis on foo
 ; CHECK-POSTLINK-O-NEXT: Running pass: InjectTLIMappings

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 15f11914bbde2..eab1f2a257c1a 100644
--- a/llvm/test/Other/new-pm-thinlto-postlink-pgo-defaults.ll
+++ b/llvm/test/Other/new-pm-thinlto-postlink-pgo-defaults.ll
@@ -154,6 +154,7 @@
 ; CHECK-O-NEXT: Running pass: LCSSAPass on foo
 ; CHECK-O-NEXT: Running pass: LoopRotatePass
 ; CHECK-O-NEXT: Running pass: LoopDeletionPass
+; CHECK-O-NEXT: Running pass: LoopInterchangePass
 ; CHECK-O-NEXT: Running pass: LoopDistributePass
 ; CHECK-O-NEXT: Running analysis: LoopAccessAnalysis on foo
 ; CHECK-O-NEXT: Running pass: InjectTLIMappings

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 8eac5cf56a106..339e346fdf439 100644
--- a/llvm/test/Other/new-pm-thinlto-postlink-samplepgo-defaults.ll
+++ b/llvm/test/Other/new-pm-thinlto-postlink-samplepgo-defaults.ll
@@ -161,6 +161,7 @@
 ; CHECK-O-NEXT: Running pass: LCSSAPass
 ; CHECK-O-NEXT: Running pass: LoopRotatePass
 ; CHECK-O-NEXT: Running pass: LoopDeletionPass
+; CHECK-O-NEXT: Running pass: LoopInterchangePass
 ; CHECK-O-NEXT: Running pass: LoopDistributePass
 ; CHECK-O-NEXT: Running analysis: LoopAccessAnalysis
 ; CHECK-O-NEXT: Running pass: InjectTLIMappings