Bail out jump threading on indirect branches only #117778
Merged
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Remove check for PHI in pred as pointed out in llvm#103688 Reduced the testcase to remove redundant phi in pred Fixes: 102351
|
@llvm/pr-subscribers-llvm-transforms Author: AdityaK (hiraditya) ChangesRemove check for PHI in pred as pointed out in #103688 Fixes: #102351 Full diff: https://github.com/llvm/llvm-project/pull/117778.diff 2 Files Affected:
diff --git a/llvm/lib/Transforms/Utils/Local.cpp b/llvm/lib/Transforms/Utils/Local.cpp
index d574095d75c58c..ec01e940a94c57 100644
--- a/llvm/lib/Transforms/Utils/Local.cpp
+++ b/llvm/lib/Transforms/Utils/Local.cpp
@@ -1034,8 +1034,7 @@ CanRedirectPredsOfEmptyBBToSucc(BasicBlock *BB, BasicBlock *Succ,
return false;
if (any_of(BBPreds, [](const BasicBlock *Pred) {
- return isa<PHINode>(Pred->begin()) &&
- isa<IndirectBrInst>(Pred->getTerminator());
+ return isa<IndirectBrInst>(Pred->getTerminator());
}))
return false;
diff --git a/llvm/test/Transforms/SimplifyCFG/switch-branch-fold-indirectbr-102351.ll b/llvm/test/Transforms/SimplifyCFG/switch-branch-fold-indirectbr-102351.ll
index 03aee68fa4248c..d3713be8358db4 100644
--- a/llvm/test/Transforms/SimplifyCFG/switch-branch-fold-indirectbr-102351.ll
+++ b/llvm/test/Transforms/SimplifyCFG/switch-branch-fold-indirectbr-102351.ll
@@ -1,104 +1,81 @@
-; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --prefix-filecheck-ir-name pref --version 5
; RUN: opt < %s -passes=simplifycfg -S | FileCheck %s
-target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
-target triple = "x86_64-unknown-linux-gnu"
-
-define dso_local noundef i32 @main() {
-; CHECK-LABEL: define dso_local noundef i32 @main() {
+define i32 @foo.1(i32 %arg, ptr %arg1) {
+; CHECK-LABEL: define i32 @foo.1(
+; CHECK-SAME: i32 [[ARG:%.*]], ptr [[ARG1:%.*]]) {
; CHECK-NEXT: [[BB:.*]]:
; CHECK-NEXT: [[ALLOCA:%.*]] = alloca [2 x ptr], align 16
-; CHECK-NEXT: store ptr blockaddress(@main, %[[BB4:.*]]), ptr [[ALLOCA]], align 16, !tbaa [[TBAA0:![0-9]+]]
+; CHECK-NEXT: store ptr blockaddress(@foo.1, %[[BB8:.*]]), ptr [[ALLOCA]], align 16
; CHECK-NEXT: [[GETELEMENTPTR:%.*]] = getelementptr inbounds [2 x ptr], ptr [[ALLOCA]], i64 0, i64 1
-; CHECK-NEXT: store ptr blockaddress(@main, %[[BB10:.*]]), ptr [[GETELEMENTPTR]], align 8, !tbaa [[TBAA0]]
-; CHECK-NEXT: br label %[[BB1:.*]]
-; CHECK: [[BB1]]:
-; CHECK-NEXT: [[PHI:%.*]] = phi i32 [ 0, %[[BB]] ], [ [[PHI8:%.*]], %[[BB7:.*]] ]
-; CHECK-NEXT: [[PHI2:%.*]] = phi i32 [ 0, %[[BB]] ], [ [[PHI9:%.*]], %[[BB7]] ]
-; CHECK-NEXT: switch i32 [[PHI]], label %[[BB7]] [
-; CHECK-NEXT: i32 0, label %[[BB12:.*]]
-; CHECK-NEXT: i32 1, label %[[BB4]]
-; CHECK-NEXT: i32 2, label %[[BB6:.*]]
+; CHECK-NEXT: store ptr blockaddress(@foo.1, %[[BB16:.*]]), ptr [[GETELEMENTPTR]], align 8
+; CHECK-NEXT: br label %[[PREFBB2:.*]]
+; CHECK: [[PREFBB2]]:
+; CHECK-NEXT: [[PHI:%.*]] = phi i32 [ 0, %[[BB]] ], [ [[PHI14:%.*]], %[[BB13:.*]] ]
+; CHECK-NEXT: [[PHI3:%.*]] = phi i32 [ 0, %[[BB]] ], [ [[PHI15:%.*]], %[[BB13]] ]
+; CHECK-NEXT: switch i32 [[PHI]], label %[[BB13]] [
+; CHECK-NEXT: i32 0, label %[[PREFBB18:.*]]
+; CHECK-NEXT: i32 1, label %[[BB8]]
+; CHECK-NEXT: i32 2, label %[[PREFBB11:.*]]
; CHECK-NEXT: ]
-; CHECK: [[BB4]]:
-; CHECK-NEXT: [[PHI5:%.*]] = phi i32 [ [[PHI13:%.*]], %[[BB12]] ], [ [[PHI2]], %[[BB1]] ]
-; CHECK-NEXT: br label %[[BB7]]
-; CHECK: [[BB6]]:
-; CHECK-NEXT: [[CALL:%.*]] = call i32 @foo(i32 noundef [[PHI2]])
-; CHECK-NEXT: [[ADD:%.*]] = add nsw i32 [[PHI2]], 1
-; CHECK-NEXT: br label %[[BB12]]
-; CHECK: [[BB7]]:
-; CHECK-NEXT: [[PHI8]] = phi i32 [ [[PHI]], %[[BB1]] ], [ 2, %[[BB4]] ]
-; CHECK-NEXT: [[PHI9]] = phi i32 [ [[PHI2]], %[[BB1]] ], [ [[PHI5]], %[[BB4]] ]
-; CHECK-NEXT: br label %[[BB1]], !llvm.loop [[LOOP4:![0-9]+]]
-; CHECK: [[BB10]]:
-; CHECK-NEXT: [[CALL11:%.*]] = call i32 @foo(i32 noundef [[PHI13]])
+; CHECK: [[BB8]]:
+; CHECK-NEXT: [[PHI10:%.*]] = phi i32 [ [[ARG]], %[[PREFBB18]] ], [ [[PHI3]], %[[PREFBB2]] ]
+; CHECK-NEXT: br label %[[BB13]]
+; CHECK: [[PREFBB11]]:
+; CHECK-NEXT: [[CALL:%.*]] = call i32 @wombat(i32 noundef [[PHI3]])
+; CHECK-NEXT: [[ADD:%.*]] = add nsw i32 [[PHI3]], 1
+; CHECK-NEXT: br label %[[PREFBB18]]
+; CHECK: [[BB13]]:
+; CHECK-NEXT: [[PHI14]] = phi i32 [ [[PHI]], %[[PREFBB2]] ], [ 2, %[[BB8]] ]
+; CHECK-NEXT: [[PHI15]] = phi i32 [ [[PHI3]], %[[PREFBB2]] ], [ [[PHI10]], %[[BB8]] ]
+; CHECK-NEXT: br label %[[PREFBB2]]
+; CHECK: [[BB16]]:
+; CHECK-NEXT: [[CALL17:%.*]] = call i32 @wombat(i32 noundef [[ARG]])
; CHECK-NEXT: ret i32 0
-; CHECK: [[BB12]]:
-; CHECK-NEXT: [[PHI13]] = phi i32 [ [[ADD]], %[[BB6]] ], [ [[PHI2]], %[[BB1]] ]
-; CHECK-NEXT: [[SEXT:%.*]] = sext i32 [[PHI13]] to i64
-; CHECK-NEXT: [[GETELEMENTPTR14:%.*]] = getelementptr inbounds [2 x ptr], ptr [[ALLOCA]], i64 0, i64 [[SEXT]]
-; CHECK-NEXT: [[LOAD:%.*]] = load ptr, ptr [[GETELEMENTPTR14]], align 8, !tbaa [[TBAA0]]
-; CHECK-NEXT: indirectbr ptr [[LOAD]], [label %[[BB4]], label %bb10]
+; CHECK: [[PREFBB18]]:
+; CHECK-NEXT: [[LOAD:%.*]] = load ptr, ptr [[ARG1]], align 8
+; CHECK-NEXT: indirectbr ptr [[LOAD]], [label %[[BB8]], label %bb16]
;
bb:
%alloca = alloca [2 x ptr], align 16
- store ptr blockaddress(@main, %bb4), ptr %alloca, align 16, !tbaa !0
+ store ptr blockaddress(@foo.1, %bb8), ptr %alloca, align 16
%getelementptr = getelementptr inbounds [2 x ptr], ptr %alloca, i64 0, i64 1
- store ptr blockaddress(@main, %bb10), ptr %getelementptr, align 8, !tbaa !0
- br label %bb1
+ store ptr blockaddress(@foo.1, %bb16), ptr %getelementptr, align 8
+ br label %bb2
-bb1: ; preds = %bb7, %bb
- %phi = phi i32 [ 0, %bb ], [ %phi8, %bb7 ]
- %phi2 = phi i32 [ 0, %bb ], [ %phi9, %bb7 ]
- switch i32 %phi, label %bb7 [
- i32 0, label %bb3
- i32 1, label %bb4
- i32 2, label %bb6
+bb2: ; preds = %bb13, %bb
+ %phi = phi i32 [ 0, %bb ], [ %phi14, %bb13 ]
+ %phi3 = phi i32 [ 0, %bb ], [ %phi15, %bb13 ]
+ switch i32 %phi, label %bb13 [
+ i32 0, label %bb5
+ i32 1, label %bb8
+ i32 2, label %bb11
]
-bb3: ; preds = %bb1
- br label %bb12
+bb5: ; preds = %bb2
+ br label %bb18
-bb4: ; preds = %bb12, %bb1
- %phi5 = phi i32 [ %phi13, %bb12 ], [ %phi2, %bb1 ]
- br label %bb7
+bb8: ; preds = %bb18, %bb2
+ %phi10 = phi i32 [ %arg, %bb18 ], [ %phi3, %bb2 ]
+ br label %bb13
-bb6: ; preds = %bb1
- %call = call i32 @foo(i32 noundef %phi2)
- %add = add nsw i32 %phi2, 1
- br label %bb12
+bb11: ; preds = %bb2
+ %call = call i32 @wombat(i32 noundef %phi3)
+ %add = add nsw i32 %phi3, 1
+ br label %bb18
-bb7: ; preds = %bb4, %bb1
- %phi8 = phi i32 [ %phi, %bb1 ], [ 2, %bb4 ]
- %phi9 = phi i32 [ %phi2, %bb1 ], [ %phi5, %bb4 ]
- br label %bb1, !llvm.loop !4
+bb13: ; preds = %bb8, %bb2
+ %phi14 = phi i32 [ %phi, %bb2 ], [ 2, %bb8 ]
+ %phi15 = phi i32 [ %phi3, %bb2 ], [ %phi10, %bb8 ]
+ br label %bb2
-bb10: ; preds = %bb12
- %call11 = call i32 @foo(i32 noundef %phi13)
+bb16: ; preds = %bb18
+ %call17 = call i32 @wombat(i32 noundef %arg)
ret i32 0
-bb12: ; preds = %bb6, %bb3
- %phi13 = phi i32 [ %add, %bb6 ], [ %phi2, %bb3 ]
- %sext = sext i32 %phi13 to i64
- %getelementptr14 = getelementptr inbounds [2 x ptr], ptr %alloca, i64 0, i64 %sext
- %load = load ptr, ptr %getelementptr14, align 8, !tbaa !0
- indirectbr ptr %load, [label %bb4, label %bb10]
+bb18: ; preds = %bb11, %bb5
+ %load = load ptr, ptr %arg1, align 8
+ indirectbr ptr %load, [label %bb8, label %bb16]
}
-declare i32 @foo(i32)
-
-!0 = !{!1, !1, i64 0}
-!1 = !{!"any pointer", !2, i64 0}
-!2 = !{!"omnipotent char", !3, i64 0}
-!3 = !{!"Simple C++ TBAA"}
-!4 = !{!5, !5, i64 0}
-!5 = !{!"int", !2, i64 0}
-;.
-; CHECK: [[TBAA0]] = !{[[META1:![0-9]+]], [[META1]], i64 0}
-; CHECK: [[META1]] = !{!"any pointer", [[META2:![0-9]+]], i64 0}
-; CHECK: [[META2]] = !{!"omnipotent char", [[META3:![0-9]+]], i64 0}
-; CHECK: [[META3]] = !{!"Simple C++ TBAA"}
-; CHECK: [[LOOP4]] = !{[[META5:![0-9]+]], [[META5]], i64 0}
-; CHECK: [[META5]] = !{!"int", [[META2]], i64 0}
-;.
+declare i32 @wombat(i32)
|
|
LLVM Buildbot has detected a new failure on builder Full details are available at: https://lab.llvm.org/buildbot/#/builders/185/builds/9222 Here is the relevant piece of the build log for the reference |
|
/pull-request #117869 |
tru
pushed a commit
to llvmbot/llvm-project
that referenced
this pull request
Dec 2, 2024
Remove check for PHI in pred as pointed out in llvm#103688 Reduced the testcase to remove redundant phi in pred Fixes: llvm#102351 (cherry picked from commit 39601a6)
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Remove check for PHI in pred as pointed out in #103688
Reduced the testcase to remove redundant phi in pred
Fixes: #102351