[LICM] Adding the test as a precommit for the D113289

diff --git a/llvm/test/Transforms/LICM/hoist-load-without-store.ll b/llvm/test/Transforms/LICM/hoist-load-without-store.ll
new file mode 100644 (file)
index 0000000..b464f6b
--- /dev/null
+++ b/llvm/test/Transforms/LICM/hoist-load-without-store.ll
@@ -0,0 +1,66 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt -licm -S < %s | FileCheck %s
+
+;; C reproducer:
+;; void f(int *ptr, int n) {
+;;   for (int i = 0; i < n; ++i) {
+;;     int x = *ptr;
+;;     if (x)
+;;       break;
+;;
+;;     *ptr = x + 1;
+;;   }
+;; }
+
+define dso_local void @f(i32* nocapture %ptr, i32 %n) {
+; CHECK-LABEL: @f(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[CMP7:%.*]] = icmp slt i32 0, [[N:%.*]]
+; CHECK-NEXT:    br i1 [[CMP7]], label [[FOR_BODY_LR_PH:%.*]], label [[CLEANUP1:%.*]]
+; CHECK:       for.body.lr.ph:
+; CHECK-NEXT:    br label [[FOR_BODY:%.*]]
+; CHECK:       for.body:
+; CHECK-NEXT:    [[I_08:%.*]] = phi i32 [ 0, [[FOR_BODY_LR_PH]] ], [ [[INC:%.*]], [[IF_END:%.*]] ]
+; CHECK-NEXT:    [[TMP0:%.*]] = load i32, i32* [[PTR:%.*]], align 4
+; CHECK-NEXT:    [[TOBOOL_NOT:%.*]] = icmp eq i32 [[TMP0]], 0
+; CHECK-NEXT:    br i1 [[TOBOOL_NOT]], label [[IF_END]], label [[FOR_BODY_CLEANUP1_CRIT_EDGE:%.*]]
+; CHECK:       if.end:
+; CHECK-NEXT:    store i32 1, i32* [[PTR]], align 4
+; CHECK-NEXT:    [[INC]] = add nuw nsw i32 [[I_08]], 1
+; CHECK-NEXT:    [[CMP:%.*]] = icmp slt i32 [[INC]], [[N]]
+; CHECK-NEXT:    br i1 [[CMP]], label [[FOR_BODY]], label [[FOR_COND_CLEANUP1_CRIT_EDGE:%.*]]
+; CHECK:       for.body.cleanup1_crit_edge:
+; CHECK-NEXT:    br label [[CLEANUP1]]
+; CHECK:       for.cond.cleanup1_crit_edge:
+; CHECK-NEXT:    br label [[CLEANUP1]]
+; CHECK:       cleanup1:
+; CHECK-NEXT:    ret void
+;
+entry:
+  %cmp7 = icmp slt i32 0, %n
+  br i1 %cmp7, label %for.body.lr.ph, label %cleanup1
+
+for.body.lr.ph:                                   ; preds = %entry
+  br label %for.body
+
+for.body:                                         ; preds = %for.body.lr.ph, %if.end
+  %i.08 = phi i32 [ 0, %for.body.lr.ph ], [ %inc, %if.end ]
+  %0 = load i32, i32* %ptr, align 4
+  %tobool.not = icmp eq i32 %0, 0
+  br i1 %tobool.not, label %if.end, label %for.body.cleanup1_crit_edge
+
+if.end:                                           ; preds = %for.body
+  store i32 1, i32* %ptr, align 4
+  %inc = add nuw nsw i32 %i.08, 1
+  %cmp = icmp slt i32 %inc, %n
+  br i1 %cmp, label %for.body, label %for.cond.cleanup1_crit_edge
+
+for.body.cleanup1_crit_edge:                      ; preds = %for.body
+  br label %cleanup1
+
+for.cond.cleanup1_crit_edge:                      ; preds = %if.end
+  br label %cleanup1
+
+cleanup1:                                         ; preds = %for.cond.cleanup1_crit_edge, %for.body.cleanup1_crit_edge, %entry
+  ret void
+}