diff --git a/llvm/test/Analysis/ScalarEvolution/implied-via-addition.ll b/llvm/test/Analysis/ScalarEvolution/implied-via-addition.ll new file mode 100644 index 0000000000000..7ab6221d0da53 --- /dev/null +++ b/llvm/test/Analysis/ScalarEvolution/implied-via-addition.ll @@ -0,0 +1,111 @@ +; NOTE: Assertions have been autogenerated by utils/update_analyze_test_checks.py UTC_ARGS: --version 5 +; RUN: opt < %s -disable-output -passes="print" \ +; RUN: -scalar-evolution-classify-expressions=0 2>&1 | FileCheck %s + +define void @implied1(i32 %n) { +; Prove that (n s> 1) ===> (n - 1 s> 0). +; CHECK-LABEL: 'implied1' +; CHECK-NEXT: Determining loop execution counts for: @implied1 +; CHECK-NEXT: Loop %header: backedge-taken count is (-2 + %n) +; CHECK-NEXT: Loop %header: constant max backedge-taken count is i32 2147483645 +; CHECK-NEXT: Loop %header: symbolic max backedge-taken count is (-2 + %n) +; CHECK-NEXT: Loop %header: Trip multiple is 1 +; +entry: + %cmp1 = icmp sgt i32 %n, 1 + %n.minus.1 = sub nsw i32 %n, 1 + call void @llvm.assume(i1 %cmp1) + br label %header + +header: + %indvar = phi i32 [ %indvar.next, %header ], [ 0, %entry ] + %indvar.next = add i32 %indvar, 1 + %exitcond = icmp sgt i32 %n.minus.1, %indvar.next + br i1 %exitcond, label %header, label %exit + +exit: + ret void +} + +define void @implied1_neg(i32 %n) { +; Prove that (n s> 0) =\=> (n - 1 s> 0). +; CHECK-LABEL: 'implied1_neg' +; CHECK-NEXT: Determining loop execution counts for: @implied1_neg +; CHECK-NEXT: Loop %header: backedge-taken count is (-1 + (1 smax (-1 + %n))) +; CHECK-NEXT: Loop %header: constant max backedge-taken count is i32 2147483645 +; CHECK-NEXT: Loop %header: symbolic max backedge-taken count is (-1 + (1 smax (-1 + %n))) +; CHECK-NEXT: Loop %header: Trip multiple is 1 +; +entry: + %cmp1 = icmp sgt i32 %n, 0 + %n.minus.1 = sub nsw i32 %n, 1 + call void @llvm.assume(i1 %cmp1) + br label %header + +header: + %indvar = phi i32 [ %indvar.next, %header ], [ 0, %entry ] + %indvar.next = add i32 %indvar, 1 + %exitcond = icmp sgt i32 %n.minus.1, %indvar.next + br i1 %exitcond, label %header, label %exit + +exit: + ret void +} + +define void @implied2(i32 %n) { +; Prove that (n u>= -1) ===> (n + 1 u>= 0). +; CHECK-LABEL: 'implied2' +; CHECK-NEXT: Determining loop execution counts for: @implied2 +; CHECK-NEXT: Loop %header: Unpredictable backedge-taken count. +; CHECK-NEXT: Loop %header: Unpredictable constant max backedge-taken count. +; CHECK-NEXT: Loop %header: Unpredictable symbolic max backedge-taken count. +; CHECK-NEXT: Loop %header: Predicated backedge-taken count is (1 + (zext i32 %n to i64)) +; CHECK-NEXT: Predicates: +; CHECK-NEXT: {1,+,1}<%header> Added Flags: +; CHECK-NEXT: Loop %header: Predicated constant max backedge-taken count is i64 4294967296 +; CHECK-NEXT: Predicates: +; CHECK-NEXT: {1,+,1}<%header> Added Flags: +; CHECK-NEXT: Loop %header: Predicated symbolic max backedge-taken count is (1 + (zext i32 %n to i64)) +; CHECK-NEXT: Predicates: +; CHECK-NEXT: {1,+,1}<%header> Added Flags: +; +entry: + %cmp1 = icmp uge i32 %n, -1 + %n.1 = add nuw i32 %n, 1 + call void @llvm.assume(i1 %cmp1) + br label %header + +header: + %indvar = phi i32 [ %indvar.next, %header ], [ 0, %entry ] + %indvar.next = add i32 %indvar, 1 + %exitcond = icmp uge i32 %n.1, %indvar.next + br i1 %exitcond, label %header, label %exit + +exit: + ret void +} + +define void @implied2_neg(i32 %n) { +; Prove that (n u>= -1) =\=> (n - 1 s>= 0). +; CHECK-LABEL: 'implied2_neg' +; CHECK-NEXT: Determining loop execution counts for: @implied2_neg +; CHECK-NEXT: Loop %header: backedge-taken count is (-1 + (1 smax %n)) +; CHECK-NEXT: Loop %header: constant max backedge-taken count is i32 2147483646 +; CHECK-NEXT: Loop %header: symbolic max backedge-taken count is (-1 + (1 smax %n)) +; CHECK-NEXT: Loop %header: Trip multiple is 1 +; +entry: + %cmp1 = icmp uge i32 %n, -1 + %n.minus.1 = sub nuw nsw i32 %n, 1 + call void @llvm.assume(i1 %cmp1) + br label %header + +header: + %indvar = phi i32 [ %indvar.next, %header ], [ 0, %entry ] + %indvar.next = add i32 %indvar, 1 + %exitcond = icmp sge i32 %n.minus.1, %indvar.next + br i1 %exitcond, label %header, label %exit + +exit: + ret void +}