[PATCH] D152434: [BBUtils] Don't add 'then' block to a loop if it's terminated with unreachable
Dmitry Makogon via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Thu Jun 8 05:04:37 PDT 2023
dmakogon created this revision.
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`SplitBlockAndInsertIfThen` utility creates two new blocks, they're called `ThenBlock` and `Tail` (true and false destinations of a conditional branch correspondingly). The function has a bool parameter `Unreachable`, and if it's set, then `ThenBlock` is terminated with an unreachable.
At the end of the function the new blocks are added to the loop of the split block. However, in case `ThenBlock` is terminated with an unreachable, it cannot belong to any loop.
https://reviews.llvm.org/D152434
Files:
llvm/lib/Transforms/Utils/BasicBlockUtils.cpp
llvm/test/Transforms/SimpleLoopUnswitch/guards.ll
llvm/test/Transforms/SimpleLoopUnswitch/nontrivial-unswitch-skip-selects-in-guards.ll
Index: llvm/test/Transforms/SimpleLoopUnswitch/nontrivial-unswitch-skip-selects-in-guards.ll
===================================================================
--- llvm/test/Transforms/SimpleLoopUnswitch/nontrivial-unswitch-skip-selects-in-guards.ll
+++ llvm/test/Transforms/SimpleLoopUnswitch/nontrivial-unswitch-skip-selects-in-guards.ll
@@ -7,9 +7,6 @@
declare void @llvm.experimental.guard(i1, ...)
declare void @widget()
-; XFAIL: *
-; REQUIRES: asserts
-
define void @foo(ptr addrspace(1) %arg, i64 %arg1) personality ptr @pluto {
; CHECK-LABEL: @foo(
; CHECK-NEXT: bb:
Index: llvm/test/Transforms/SimpleLoopUnswitch/guards.ll
===================================================================
--- llvm/test/Transforms/SimpleLoopUnswitch/guards.ll
+++ llvm/test/Transforms/SimpleLoopUnswitch/guards.ll
@@ -2,9 +2,6 @@
; RUN: opt -passes='simple-loop-unswitch<nontrivial>' -simple-loop-unswitch-guards -S < %s | FileCheck %s
; RUN: opt -passes='loop-mssa(simple-loop-unswitch<nontrivial>),verify<loops>' -simple-loop-unswitch-guards -verify-memoryssa -S < %s | FileCheck %s
-; XFAIL: *
-; REQUIRES: asserts
-
declare void @llvm.experimental.guard(i1, ...)
define void @test_simple_case(i1 %cond, i32 %N) {
Index: llvm/lib/Transforms/Utils/BasicBlockUtils.cpp
===================================================================
--- llvm/lib/Transforms/Utils/BasicBlockUtils.cpp
+++ llvm/lib/Transforms/Utils/BasicBlockUtils.cpp
@@ -1518,7 +1518,9 @@
if (LI) {
if (Loop *L = LI->getLoopFor(Head)) {
- L->addBasicBlockToLoop(ThenBlock, *LI);
+ // unreachable-terminated blocks cannot belong to any loop.
+ if (!Unreachable)
+ L->addBasicBlockToLoop(ThenBlock, *LI);
L->addBasicBlockToLoop(Tail, *LI);
}
}
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