[llvm] [LoopDeletion] RAUW single-entry header phis after breakLoopBackedge. (PR #106046)
via llvm-commits
llvm-commits at lists.llvm.org
Mon Aug 26 01:52:10 PDT 2024
llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-llvm-transforms
Author: Florian Hahn (fhahn)
<details>
<summary>Changes</summary>
breakLoopBackedge leaves single-entry phi nodes, which can be replaced by their single incoming value. This helps to remove redundant phis when deleting loops before loop-vectorize. This still leaves some additional follow-up simplifications on the table.
(https://github.com/llvm/llvm-project/blob/main/llvm/lib/Passes/PassBuilderPipelines.cpp#L1502)
---
Full diff: https://github.com/llvm/llvm-project/pull/106046.diff
5 Files Affected:
- (modified) llvm/lib/Transforms/Utils/LoopUtils.cpp (+5)
- (modified) llvm/test/Transforms/LoopDeletion/D108848-regression.ll (+2-2)
- (modified) llvm/test/Transforms/LoopDeletion/eval_first_iteration.ll (+41-41)
- (modified) llvm/test/Transforms/LoopDeletion/pr49967.ll (+1-1)
- (modified) llvm/test/Transforms/LoopDeletion/zero-btc.ll (+3-3)
``````````diff
diff --git a/llvm/lib/Transforms/Utils/LoopUtils.cpp b/llvm/lib/Transforms/Utils/LoopUtils.cpp
index f1f2d522f1cbaa..4783a16bcc8d23 100644
--- a/llvm/lib/Transforms/Utils/LoopUtils.cpp
+++ b/llvm/lib/Transforms/Utils/LoopUtils.cpp
@@ -759,6 +759,11 @@ void llvm::breakLoopBackedge(Loop *L, DominatorTree &DT, ScalarEvolution &SE,
DomTreeUpdater DTU(&DT, DomTreeUpdater::UpdateStrategy::Eager);
Header->removePredecessor(Latch, true);
+ for (PHINode &PN : Header->phis()) {
+ if (PN.getNumIncomingValues() == 1)
+ PN.replaceAllUsesWith(PN.getIncomingValue(0));
+ }
+
IRBuilder<> Builder(BI);
auto *NewBI = Builder.CreateBr(ExitBB);
// Transfer the metadata to the new branch instruction (minus the
diff --git a/llvm/test/Transforms/LoopDeletion/D108848-regression.ll b/llvm/test/Transforms/LoopDeletion/D108848-regression.ll
index 536e5d1523326c..5b855ba409e5cf 100644
--- a/llvm/test/Transforms/LoopDeletion/D108848-regression.ll
+++ b/llvm/test/Transforms/LoopDeletion/D108848-regression.ll
@@ -12,10 +12,10 @@ define i32 @main() {
; CHECK-NEXT: call void @foo()
; CHECK-NEXT: [[DOTB:%.*]] = load i1, ptr @a, align 4
; CHECK-NEXT: [[CONV1:%.*]] = select i1 [[DOTB]], i32 -128, i32 1
-; CHECK-NEXT: [[CMP2_NOT:%.*]] = icmp ugt i32 [[CONV1]], [[D_015]]
+; CHECK-NEXT: [[CMP2_NOT:%.*]] = icmp ugt i32 [[CONV1]], 0
; CHECK-NEXT: br i1 [[CMP2_NOT]], label [[CLEANUP:%.*]], label [[FOR_INC8:%.*]]
; CHECK: for.inc8:
-; CHECK-NEXT: [[INC9:%.*]] = add nuw nsw i32 [[D_015]], 1
+; CHECK-NEXT: [[INC9:%.*]] = add nuw nsw i32 0, 1
; CHECK-NEXT: [[EXITCOND_NOT:%.*]] = icmp eq i32 [[INC9]], 19
; CHECK-NEXT: br label [[CLEANUP]]
; CHECK: cleanup:
diff --git a/llvm/test/Transforms/LoopDeletion/eval_first_iteration.ll b/llvm/test/Transforms/LoopDeletion/eval_first_iteration.ll
index 715f1287c57757..4acaabfcb439f6 100644
--- a/llvm/test/Transforms/LoopDeletion/eval_first_iteration.ll
+++ b/llvm/test/Transforms/LoopDeletion/eval_first_iteration.ll
@@ -287,8 +287,8 @@ define i32 @test_multiple_pred(i32 %limit) {
; CHECK-NEXT: br i1 [[IS_POSITIVE]], label [[IF_TRUE:%.*]], label [[IF_FALSE:%.*]]
; CHECK: if.true:
; CHECK-NEXT: switch i32 [[LIMIT]], label [[FAILURE_LOOPEXIT:%.*]] [
-; CHECK-NEXT: i32 100, label [[BACKEDGE]]
-; CHECK-NEXT: i32 200, label [[BACKEDGE]]
+; CHECK-NEXT: i32 100, label [[BACKEDGE]]
+; CHECK-NEXT: i32 200, label [[BACKEDGE]]
; CHECK-NEXT: ]
; CHECK: if.false:
; CHECK-NEXT: br label [[BACKEDGE]]
@@ -344,14 +344,14 @@ define i32 @test_ne_const() {
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[SUM:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ]
-; CHECK-NEXT: [[SUB:%.*]] = sub i32 4, [[SUM]]
+; CHECK-NEXT: [[SUB:%.*]] = sub i32 4, 0
; CHECK-NEXT: [[IS_POSITIVE:%.*]] = icmp sgt i32 [[SUB]], 0
; CHECK-NEXT: br i1 [[IS_POSITIVE]], label [[BACKEDGE:%.*]], label [[IF_FALSE:%.*]]
; CHECK: if.false:
; CHECK-NEXT: br label [[BACKEDGE]]
; CHECK: backedge:
; CHECK-NEXT: [[MERGE_PHI:%.*]] = phi i32 [ 0, [[IF_FALSE]] ], [ [[SUB]], [[LOOP]] ]
-; CHECK-NEXT: [[SUM_NEXT:%.*]] = add i32 [[SUM]], [[MERGE_PHI]]
+; CHECK-NEXT: [[SUM_NEXT:%.*]] = add i32 0, [[MERGE_PHI]]
; CHECK-NEXT: [[LOOP_COND:%.*]] = icmp ne i32 [[SUM_NEXT]], 4
; CHECK-NEXT: br label [[DONE:%.*]]
; CHECK: done:
@@ -393,14 +393,14 @@ define i32 @test_slt_const() {
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[SUM:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ]
-; CHECK-NEXT: [[SUB:%.*]] = sub i32 4, [[SUM]]
+; CHECK-NEXT: [[SUB:%.*]] = sub i32 4, 0
; CHECK-NEXT: [[IS_POSITIVE:%.*]] = icmp sgt i32 [[SUB]], 0
; CHECK-NEXT: br i1 [[IS_POSITIVE]], label [[BACKEDGE:%.*]], label [[IF_FALSE:%.*]]
; CHECK: if.false:
; CHECK-NEXT: br label [[BACKEDGE]]
; CHECK: backedge:
; CHECK-NEXT: [[MERGE_PHI:%.*]] = phi i32 [ 0, [[IF_FALSE]] ], [ [[SUB]], [[LOOP]] ]
-; CHECK-NEXT: [[SUM_NEXT:%.*]] = add i32 [[SUM]], [[MERGE_PHI]]
+; CHECK-NEXT: [[SUM_NEXT:%.*]] = add i32 0, [[MERGE_PHI]]
; CHECK-NEXT: [[LOOP_COND:%.*]] = icmp slt i32 [[SUM_NEXT]], 4
; CHECK-NEXT: br label [[DONE:%.*]]
; CHECK: done:
@@ -442,14 +442,14 @@ define i32 @test_ult_const() {
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[SUM:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ]
-; CHECK-NEXT: [[SUB:%.*]] = sub i32 4, [[SUM]]
+; CHECK-NEXT: [[SUB:%.*]] = sub i32 4, 0
; CHECK-NEXT: [[IS_POSITIVE:%.*]] = icmp sgt i32 [[SUB]], 0
; CHECK-NEXT: br i1 [[IS_POSITIVE]], label [[BACKEDGE:%.*]], label [[IF_FALSE:%.*]]
; CHECK: if.false:
; CHECK-NEXT: br label [[BACKEDGE]]
; CHECK: backedge:
; CHECK-NEXT: [[MERGE_PHI:%.*]] = phi i32 [ 0, [[IF_FALSE]] ], [ [[SUB]], [[LOOP]] ]
-; CHECK-NEXT: [[SUM_NEXT:%.*]] = add i32 [[SUM]], [[MERGE_PHI]]
+; CHECK-NEXT: [[SUM_NEXT:%.*]] = add i32 0, [[MERGE_PHI]]
; CHECK-NEXT: [[LOOP_COND:%.*]] = icmp ult i32 [[SUM_NEXT]], 4
; CHECK-NEXT: br label [[DONE:%.*]]
; CHECK: done:
@@ -491,14 +491,14 @@ define i32 @test_sgt_const() {
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[SUM:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ]
-; CHECK-NEXT: [[SUB:%.*]] = sub i32 4, [[SUM]]
+; CHECK-NEXT: [[SUB:%.*]] = sub i32 4, 0
; CHECK-NEXT: [[IS_POSITIVE:%.*]] = icmp sgt i32 [[SUB]], 0
; CHECK-NEXT: br i1 [[IS_POSITIVE]], label [[BACKEDGE:%.*]], label [[IF_FALSE:%.*]]
; CHECK: if.false:
; CHECK-NEXT: br label [[BACKEDGE]]
; CHECK: backedge:
; CHECK-NEXT: [[MERGE_PHI:%.*]] = phi i32 [ 0, [[IF_FALSE]] ], [ [[SUB]], [[LOOP]] ]
-; CHECK-NEXT: [[SUM_NEXT:%.*]] = add i32 [[SUM]], [[MERGE_PHI]]
+; CHECK-NEXT: [[SUM_NEXT:%.*]] = add i32 0, [[MERGE_PHI]]
; CHECK-NEXT: [[LOOP_COND:%.*]] = icmp sgt i32 [[SUM_NEXT]], 4
; CHECK-NEXT: br label [[DONE:%.*]]
; CHECK: done:
@@ -540,14 +540,14 @@ define i32 @test_ugt_const() {
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[SUM:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ]
-; CHECK-NEXT: [[SUB:%.*]] = sub i32 4, [[SUM]]
+; CHECK-NEXT: [[SUB:%.*]] = sub i32 4, 0
; CHECK-NEXT: [[IS_POSITIVE:%.*]] = icmp sgt i32 [[SUB]], 0
; CHECK-NEXT: br i1 [[IS_POSITIVE]], label [[BACKEDGE:%.*]], label [[IF_FALSE:%.*]]
; CHECK: if.false:
; CHECK-NEXT: br label [[BACKEDGE]]
; CHECK: backedge:
; CHECK-NEXT: [[MERGE_PHI:%.*]] = phi i32 [ 0, [[IF_FALSE]] ], [ [[SUB]], [[LOOP]] ]
-; CHECK-NEXT: [[SUM_NEXT:%.*]] = add i32 [[SUM]], [[MERGE_PHI]]
+; CHECK-NEXT: [[SUM_NEXT:%.*]] = add i32 0, [[MERGE_PHI]]
; CHECK-NEXT: [[LOOP_COND:%.*]] = icmp ugt i32 [[SUM_NEXT]], 4
; CHECK-NEXT: br label [[DONE:%.*]]
; CHECK: done:
@@ -589,19 +589,19 @@ define i32 @test_multiple_pred_const() {
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[SUM:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ]
-; CHECK-NEXT: [[SUB:%.*]] = sub i32 4, [[SUM]]
+; CHECK-NEXT: [[SUB:%.*]] = sub i32 4, 0
; CHECK-NEXT: [[IS_POSITIVE:%.*]] = icmp sgt i32 [[SUB]], 0
; CHECK-NEXT: br i1 [[IS_POSITIVE]], label [[IF_TRUE:%.*]], label [[IF_FALSE:%.*]]
; CHECK: if.true:
; CHECK-NEXT: switch i32 4, label [[FAILURE:%.*]] [
-; CHECK-NEXT: i32 100, label [[BACKEDGE:%.*]]
-; CHECK-NEXT: i32 200, label [[BACKEDGE]]
+; CHECK-NEXT: i32 100, label [[BACKEDGE:%.*]]
+; CHECK-NEXT: i32 200, label [[BACKEDGE]]
; CHECK-NEXT: ]
; CHECK: if.false:
; CHECK-NEXT: br label [[BACKEDGE]]
; CHECK: backedge:
; CHECK-NEXT: [[MERGE_PHI:%.*]] = phi i32 [ 0, [[IF_FALSE]] ], [ [[SUB]], [[IF_TRUE]] ], [ [[SUB]], [[IF_TRUE]] ]
-; CHECK-NEXT: [[SUM_NEXT:%.*]] = add i32 [[SUM]], [[MERGE_PHI]]
+; CHECK-NEXT: [[SUM_NEXT:%.*]] = add i32 0, [[MERGE_PHI]]
; CHECK-NEXT: [[LOOP_COND:%.*]] = icmp ne i32 [[SUM_NEXT]], 4
; CHECK-NEXT: br label [[DONE:%.*]]
; CHECK: done:
@@ -649,7 +649,7 @@ define i32 @test_multiple_pred_2(i1 %cond, i1 %cond2) {
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[SUM:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ]
-; CHECK-NEXT: [[SUB:%.*]] = sub i32 4, [[SUM]]
+; CHECK-NEXT: [[SUB:%.*]] = sub i32 4, 0
; CHECK-NEXT: [[IS_POSITIVE:%.*]] = icmp sgt i32 [[SUB]], 0
; CHECK-NEXT: br i1 [[IS_POSITIVE]], label [[IF_TRUE:%.*]], label [[IF_FALSE:%.*]]
; CHECK: if.true:
@@ -666,7 +666,7 @@ define i32 @test_multiple_pred_2(i1 %cond, i1 %cond2) {
; CHECK-NEXT: br label [[BACKEDGE]]
; CHECK: backedge:
; CHECK-NEXT: [[MERGE_PHI:%.*]] = phi i32 [ 0, [[IF_FALSE_1]] ], [ 0, [[IF_FALSE_2]] ], [ [[SUB]], [[IF_TRUE_1]] ], [ [[SUB]], [[IF_TRUE_2]] ]
-; CHECK-NEXT: [[SUM_NEXT:%.*]] = add i32 [[SUM]], [[MERGE_PHI]]
+; CHECK-NEXT: [[SUM_NEXT:%.*]] = add i32 0, [[MERGE_PHI]]
; CHECK-NEXT: [[LOOP_COND:%.*]] = icmp ne i32 [[SUM_NEXT]], 4
; CHECK-NEXT: br label [[DONE:%.*]]
; CHECK: done:
@@ -723,7 +723,7 @@ define i32 @test_multiple_pred_poison_1(i1 %cond, i1 %cond2) {
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[SUM:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ]
-; CHECK-NEXT: [[SUB:%.*]] = sub i32 4, [[SUM]]
+; CHECK-NEXT: [[SUB:%.*]] = sub i32 4, 0
; CHECK-NEXT: [[IS_POSITIVE:%.*]] = icmp sgt i32 [[SUB]], 0
; CHECK-NEXT: br i1 [[IS_POSITIVE]], label [[IF_TRUE:%.*]], label [[IF_FALSE:%.*]]
; CHECK: if.true:
@@ -740,7 +740,7 @@ define i32 @test_multiple_pred_poison_1(i1 %cond, i1 %cond2) {
; CHECK-NEXT: br label [[BACKEDGE]]
; CHECK: backedge:
; CHECK-NEXT: [[MERGE_PHI:%.*]] = phi i32 [ 0, [[IF_FALSE_1]] ], [ 0, [[IF_FALSE_2]] ], [ [[SUB]], [[IF_TRUE_1]] ], [ poison, [[IF_TRUE_2]] ]
-; CHECK-NEXT: [[SUM_NEXT:%.*]] = add i32 [[SUM]], [[MERGE_PHI]]
+; CHECK-NEXT: [[SUM_NEXT:%.*]] = add i32 0, [[MERGE_PHI]]
; CHECK-NEXT: [[LOOP_COND:%.*]] = icmp ne i32 [[SUM_NEXT]], 4
; CHECK-NEXT: br label [[DONE:%.*]]
; CHECK: done:
@@ -796,7 +796,7 @@ define i32 @test_multiple_pred_poison_2(i1 %cond, i1 %cond2) {
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[SUM:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ]
-; CHECK-NEXT: [[SUB:%.*]] = sub i32 4, [[SUM]]
+; CHECK-NEXT: [[SUB:%.*]] = sub i32 4, 0
; CHECK-NEXT: [[IS_POSITIVE:%.*]] = icmp sgt i32 [[SUB]], 0
; CHECK-NEXT: br i1 [[IS_POSITIVE]], label [[IF_TRUE:%.*]], label [[IF_FALSE:%.*]]
; CHECK: if.true:
@@ -813,7 +813,7 @@ define i32 @test_multiple_pred_poison_2(i1 %cond, i1 %cond2) {
; CHECK-NEXT: br label [[BACKEDGE]]
; CHECK: backedge:
; CHECK-NEXT: [[MERGE_PHI:%.*]] = phi i32 [ 0, [[IF_FALSE_1]] ], [ 0, [[IF_FALSE_2]] ], [ poison, [[IF_TRUE_1]] ], [ [[SUB]], [[IF_TRUE_2]] ]
-; CHECK-NEXT: [[SUM_NEXT:%.*]] = add i32 [[SUM]], [[MERGE_PHI]]
+; CHECK-NEXT: [[SUM_NEXT:%.*]] = add i32 0, [[MERGE_PHI]]
; CHECK-NEXT: [[LOOP_COND:%.*]] = icmp ne i32 [[SUM_NEXT]], 4
; CHECK-NEXT: br label [[DONE:%.*]]
; CHECK: done:
@@ -869,7 +869,7 @@ define i32 @test_multiple_pred_poison_3(i1 %cond, i1 %cond2) {
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[SUM:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ]
-; CHECK-NEXT: [[SUB:%.*]] = sub i32 4, [[SUM]]
+; CHECK-NEXT: [[SUB:%.*]] = sub i32 4, 0
; CHECK-NEXT: [[IS_POSITIVE:%.*]] = icmp sgt i32 [[SUB]], 0
; CHECK-NEXT: br i1 [[IS_POSITIVE]], label [[IF_TRUE:%.*]], label [[IF_FALSE:%.*]]
; CHECK: if.true:
@@ -886,7 +886,7 @@ define i32 @test_multiple_pred_poison_3(i1 %cond, i1 %cond2) {
; CHECK-NEXT: br label [[BACKEDGE]]
; CHECK: backedge:
; CHECK-NEXT: [[MERGE_PHI:%.*]] = phi i32 [ 0, [[IF_FALSE_1]] ], [ 0, [[IF_FALSE_2]] ], [ poison, [[IF_TRUE_1]] ], [ poison, [[IF_TRUE_2]] ]
-; CHECK-NEXT: [[SUM_NEXT:%.*]] = add i32 [[SUM]], [[MERGE_PHI]]
+; CHECK-NEXT: [[SUM_NEXT:%.*]] = add i32 0, [[MERGE_PHI]]
; CHECK-NEXT: [[LOOP_COND:%.*]] = icmp ne i32 [[SUM_NEXT]], 4
; CHECK-NEXT: br label [[DONE:%.*]]
; CHECK: done:
@@ -985,7 +985,7 @@ define i32 @test_select_const(i32 %x) {
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[SUM:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ]
-; CHECK-NEXT: [[SUB:%.*]] = sub i32 4, [[SUM]]
+; CHECK-NEXT: [[SUB:%.*]] = sub i32 4, 0
; CHECK-NEXT: [[IS_POSITIVE:%.*]] = icmp sgt i32 [[SUB]], 0
; CHECK-NEXT: [[SEL:%.*]] = select i1 [[IS_POSITIVE]], i32 [[SUB]], i32 [[X:%.*]]
; CHECK-NEXT: [[SEL_COND:%.*]] = icmp sgt i32 [[SEL]], 0
@@ -994,7 +994,7 @@ define i32 @test_select_const(i32 %x) {
; CHECK-NEXT: br label [[BACKEDGE]]
; CHECK: backedge:
; CHECK-NEXT: [[MERGE_PHI:%.*]] = phi i32 [ 0, [[IF_FALSE]] ], [ [[SUB]], [[LOOP]] ]
-; CHECK-NEXT: [[SUM_NEXT:%.*]] = add i32 [[SUM]], [[MERGE_PHI]]
+; CHECK-NEXT: [[SUM_NEXT:%.*]] = add i32 0, [[MERGE_PHI]]
; CHECK-NEXT: [[LOOP_COND:%.*]] = icmp ne i32 [[SUM_NEXT]], 4
; CHECK-NEXT: br label [[DONE:%.*]]
; CHECK: done:
@@ -1037,11 +1037,11 @@ define i32 @test_switch_ne_default() {
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[SUM:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ]
-; CHECK-NEXT: [[SUB:%.*]] = sub i32 4, [[SUM]]
+; CHECK-NEXT: [[SUB:%.*]] = sub i32 4, 0
; CHECK-NEXT: switch i32 [[SUB]], label [[DEFAULT:%.*]] [
-; CHECK-NEXT: i32 0, label [[ONZERO:%.*]]
-; CHECK-NEXT: i32 1, label [[ONONE:%.*]]
-; CHECK-NEXT: i32 2, label [[ONTWO:%.*]]
+; CHECK-NEXT: i32 0, label [[ONZERO:%.*]]
+; CHECK-NEXT: i32 1, label [[ONONE:%.*]]
+; CHECK-NEXT: i32 2, label [[ONTWO:%.*]]
; CHECK-NEXT: ]
; CHECK: default:
; CHECK-NEXT: br label [[BACKEDGE:%.*]]
@@ -1053,7 +1053,7 @@ define i32 @test_switch_ne_default() {
; CHECK-NEXT: br label [[BACKEDGE]]
; CHECK: backedge:
; CHECK-NEXT: [[MERGE_PHI:%.*]] = phi i32 [ [[SUB]], [[DEFAULT]] ], [ 0, [[ONZERO]] ], [ 1, [[ONONE]] ], [ 2, [[ONTWO]] ]
-; CHECK-NEXT: [[SUM_NEXT:%.*]] = add i32 [[SUM]], [[MERGE_PHI]]
+; CHECK-NEXT: [[SUM_NEXT:%.*]] = add i32 0, [[MERGE_PHI]]
; CHECK-NEXT: [[LOOP_COND:%.*]] = icmp ne i32 [[SUM_NEXT]], 4
; CHECK-NEXT: br label [[DONE:%.*]]
; CHECK: done:
@@ -1102,11 +1102,11 @@ define i32 @test_switch_ne_one_case() {
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[SUM:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ]
-; CHECK-NEXT: [[SUB:%.*]] = sub i32 4, [[SUM]]
+; CHECK-NEXT: [[SUB:%.*]] = sub i32 4, 0
; CHECK-NEXT: switch i32 [[SUB]], label [[DEFAULT:%.*]] [
-; CHECK-NEXT: i32 0, label [[ONZERO:%.*]]
-; CHECK-NEXT: i32 1, label [[ONONE:%.*]]
-; CHECK-NEXT: i32 4, label [[ONTWO:%.*]]
+; CHECK-NEXT: i32 0, label [[ONZERO:%.*]]
+; CHECK-NEXT: i32 1, label [[ONONE:%.*]]
+; CHECK-NEXT: i32 4, label [[ONTWO:%.*]]
; CHECK-NEXT: ]
; CHECK: default:
; CHECK-NEXT: br label [[BACKEDGE:%.*]]
@@ -1118,7 +1118,7 @@ define i32 @test_switch_ne_one_case() {
; CHECK-NEXT: br label [[BACKEDGE]]
; CHECK: backedge:
; CHECK-NEXT: [[MERGE_PHI:%.*]] = phi i32 [ 2, [[DEFAULT]] ], [ 0, [[ONZERO]] ], [ 1, [[ONONE]] ], [ [[SUB]], [[ONTWO]] ]
-; CHECK-NEXT: [[SUM_NEXT:%.*]] = add i32 [[SUM]], [[MERGE_PHI]]
+; CHECK-NEXT: [[SUM_NEXT:%.*]] = add i32 0, [[MERGE_PHI]]
; CHECK-NEXT: [[LOOP_COND:%.*]] = icmp ne i32 [[SUM_NEXT]], 4
; CHECK-NEXT: br label [[DONE:%.*]]
; CHECK: done:
@@ -1167,11 +1167,11 @@ define i32 @test_switch_ne_one_case_identical_jumps() {
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[SUM:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ]
-; CHECK-NEXT: [[SUB:%.*]] = sub i32 2, [[SUM]]
+; CHECK-NEXT: [[SUB:%.*]] = sub i32 2, 0
; CHECK-NEXT: switch i32 [[SUB]], label [[DEFAULT:%.*]] [
-; CHECK-NEXT: i32 0, label [[FIRST_BLOCK:%.*]]
-; CHECK-NEXT: i32 1, label [[BACKEDGE:%.*]]
-; CHECK-NEXT: i32 2, label [[BACKEDGE]]
+; CHECK-NEXT: i32 0, label [[FIRST_BLOCK:%.*]]
+; CHECK-NEXT: i32 1, label [[BACKEDGE:%.*]]
+; CHECK-NEXT: i32 2, label [[BACKEDGE]]
; CHECK-NEXT: ]
; CHECK: default:
; CHECK-NEXT: br label [[BACKEDGE]]
@@ -1179,7 +1179,7 @@ define i32 @test_switch_ne_one_case_identical_jumps() {
; CHECK-NEXT: br label [[BACKEDGE]]
; CHECK: backedge:
; CHECK-NEXT: [[MERGE_PHI:%.*]] = phi i32 [ 0, [[DEFAULT]] ], [ 1, [[FIRST_BLOCK]] ], [ [[SUB]], [[LOOP]] ], [ [[SUB]], [[LOOP]] ]
-; CHECK-NEXT: [[SUM_NEXT:%.*]] = add i32 [[SUM]], [[MERGE_PHI]]
+; CHECK-NEXT: [[SUM_NEXT:%.*]] = add i32 0, [[MERGE_PHI]]
; CHECK-NEXT: [[LOOP_COND:%.*]] = icmp ne i32 [[SUM_NEXT]], 2
; CHECK-NEXT: br label [[DONE:%.*]]
; CHECK: done:
diff --git a/llvm/test/Transforms/LoopDeletion/pr49967.ll b/llvm/test/Transforms/LoopDeletion/pr49967.ll
index b0bc33b7e6631d..7cc56d599bec68 100644
--- a/llvm/test/Transforms/LoopDeletion/pr49967.ll
+++ b/llvm/test/Transforms/LoopDeletion/pr49967.ll
@@ -16,7 +16,7 @@ define void @test() {
; CHECK: for.body63:
; CHECK-NEXT: [[I58_010:%.*]] = phi i16 [ 32, [[VECTOR_PH]] ]
; CHECK-NEXT: store i16 undef, ptr undef, align 1
-; CHECK-NEXT: [[INC89:%.*]] = add nuw nsw i16 [[I58_010]], 1
+; CHECK-NEXT: [[INC89:%.*]] = add nuw nsw i16 32, 1
; CHECK-NEXT: [[EXITCOND12_NOT:%.*]] = icmp eq i16 [[INC89]], 33
; CHECK-NEXT: br label [[FOR_COND_CLEANUP62:%.*]]
; CHECK: for.cond.cleanup150.loopexit:
diff --git a/llvm/test/Transforms/LoopDeletion/zero-btc.ll b/llvm/test/Transforms/LoopDeletion/zero-btc.ll
index 933b7f65768f94..308e20743cfc00 100644
--- a/llvm/test/Transforms/LoopDeletion/zero-btc.ll
+++ b/llvm/test/Transforms/LoopDeletion/zero-btc.ll
@@ -32,7 +32,7 @@ define void @test_bottom_tested() {
; CHECK: loop:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ]
; CHECK-NEXT: store i32 0, ptr @G, align 4
-; CHECK-NEXT: [[IV_INC:%.*]] = add i32 [[IV]], 1
+; CHECK-NEXT: [[IV_INC:%.*]] = add i32 0, 1
; CHECK-NEXT: [[BE_TAKEN:%.*]] = icmp ne i32 [[IV_INC]], 1
; CHECK-NEXT: br label [[EXIT:%.*]]
; CHECK: exit:
@@ -90,7 +90,7 @@ define void @test_multi_exit1() {
; CHECK: loop:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ]
; CHECK-NEXT: store i32 0, ptr @G, align 4
-; CHECK-NEXT: [[IV_INC:%.*]] = add i32 [[IV]], 1
+; CHECK-NEXT: [[IV_INC:%.*]] = add i32 0, 1
; CHECK-NEXT: [[BE_TAKEN:%.*]] = icmp ne i32 [[IV_INC]], 1
; CHECK-NEXT: br i1 [[BE_TAKEN]], label [[LATCH:%.*]], label [[EXIT:%.*]]
; CHECK: latch:
@@ -155,7 +155,7 @@ define void @test_multi_exit3(i1 %cond1) {
; CHECK-NEXT: br i1 [[COND1:%.*]], label [[LATCH:%.*]], label [[EXIT:%.*]]
; CHECK: latch:
; CHECK-NEXT: store i32 1, ptr @G, align 4
-; CHECK-NEXT: [[IV_INC:%.*]] = add i32 [[IV]], 1
+; CHECK-NEXT: [[IV_INC:%.*]] = add i32 0, 1
; CHECK-NEXT: [[BE_TAKEN:%.*]] = icmp ne i32 [[IV_INC]], 1
; CHECK-NEXT: br label [[EXIT]]
; CHECK: exit:
``````````
</details>
https://github.com/llvm/llvm-project/pull/106046
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