[LoopUnroll] Make test more robust by removing undef.

Replace a uses of undef in the tests. The undef causes runtime checks
to be trivially fold/removeable, which does defeat the purpose of the test.

1 files changed, 16 insertions, 15 deletions

diff --git a/llvm/test/Transforms/LoopUnroll/runtime-loop-multiexit-dom-verify.ll b/llvm/test/Transforms/LoopUnroll/runtime-loop-multiexit-dom-verify.ll
index d8ad6fe3a831..2c63d9269359 100644
--- a/llvm/test/Transforms/LoopUnroll/runtime-loop-multiexit-dom-verify.ll
+++ b/llvm/test/Transforms/LoopUnroll/runtime-loop-multiexit-dom-verify.ll
@@ -649,28 +649,29 @@ otherexitB:                                              ; preds = %innerH
 
 ; Blocks reachable from exits (not_zero44) have the IDom as the block within the loop (Header).
 ; Update the IDom to the preheader.
-define void @test6() {
+define void @test6(i64 %start) {
 ; CHECK-LABEL: @test6(
 ; CHECK-NEXT:  entry:
-; CHECK-NEXT:    [[SMAX:%.*]] = call i64 @llvm.smax.i64(i64 undef, i64 616)
-; CHECK-NEXT:    [[TMP0:%.*]] = add i64 [[SMAX]], -1
-; CHECK-NEXT:    [[TMP1:%.*]] = sub i64 [[TMP0]], undef
-; CHECK-NEXT:    [[TMP2:%.*]] = lshr i64 [[TMP1]], 1
-; CHECK-NEXT:    [[TMP3:%.*]] = add nuw i64 [[TMP2]], 1
-; CHECK-NEXT:    [[XTRAITER:%.*]] = and i64 [[TMP3]], 3
+; CHECK-NEXT:    [[TMP0:%.*]] = add i64 [[START:%.*]], 2
+; CHECK-NEXT:    [[SMAX:%.*]] = call i64 @llvm.smax.i64(i64 [[TMP0]], i64 616)
+; CHECK-NEXT:    [[TMP1:%.*]] = add i64 [[SMAX]], -1
+; CHECK-NEXT:    [[TMP2:%.*]] = sub i64 [[TMP1]], [[START]]
+; CHECK-NEXT:    [[TMP3:%.*]] = lshr i64 [[TMP2]], 1
+; CHECK-NEXT:    [[TMP4:%.*]] = add nuw i64 [[TMP3]], 1
+; CHECK-NEXT:    [[XTRAITER:%.*]] = and i64 [[TMP4]], 3
 ; CHECK-NEXT:    [[LCMP_MOD:%.*]] = icmp ne i64 [[XTRAITER]], 0
 ; CHECK-NEXT:    br i1 [[LCMP_MOD]], label [[HEADER_PROL_PREHEADER:%.*]], label [[HEADER_PROL_LOOPEXIT:%.*]]
 ; CHECK:       header.prol.preheader:
 ; CHECK-NEXT:    br label [[HEADER_PROL:%.*]]
 ; CHECK:       header.prol:
-; CHECK-NEXT:    [[INDVARS_IV_PROL:%.*]] = phi i64 [ undef, [[HEADER_PROL_PREHEADER]] ], [ [[INDVARS_IV_NEXT_PROL:%.*]], [[LATCH_PROL:%.*]] ]
+; CHECK-NEXT:    [[INDVARS_IV_PROL:%.*]] = phi i64 [ [[START]], [[HEADER_PROL_PREHEADER]] ], [ [[INDVARS_IV_NEXT_PROL:%.*]], [[LATCH_PROL:%.*]] ]
 ; CHECK-NEXT:    [[PROL_ITER:%.*]] = phi i64 [ 0, [[HEADER_PROL_PREHEADER]] ], [ [[PROL_ITER_NEXT:%.*]], [[LATCH_PROL]] ]
 ; CHECK-NEXT:    [[IV_I32_PROL:%.*]] = trunc i64 [[INDVARS_IV_PROL]] to i32
 ; CHECK-NEXT:    [[C1_PROL:%.*]] = call i1 @unknown(i32 [[IV_I32_PROL]])
 ; CHECK-NEXT:    br i1 [[C1_PROL]], label [[LATCH_PROL]], label [[OTHEREXIT_LOOPEXIT1:%.*]]
 ; CHECK:       latch.prol:
 ; CHECK-NEXT:    [[INDVARS_IV_NEXT_PROL]] = add nsw i64 [[INDVARS_IV_PROL]], 2
-; CHECK-NEXT:    [[TMP4:%.*]] = icmp slt i64 [[INDVARS_IV_NEXT_PROL]], 616
+; CHECK-NEXT:    [[TMP5:%.*]] = icmp slt i64 [[INDVARS_IV_NEXT_PROL]], 616
 ; CHECK-NEXT:    [[PROL_ITER_NEXT]] = add i64 [[PROL_ITER]], 1
 ; CHECK-NEXT:    [[PROL_ITER_CMP:%.*]] = icmp ne i64 [[PROL_ITER_NEXT]], [[XTRAITER]]
 ; CHECK-NEXT:    br i1 [[PROL_ITER_CMP]], label [[HEADER_PROL]], label [[HEADER_PROL_LOOPEXIT_UNR_LCSSA:%.*]], !llvm.loop [[LOOP9:![0-9]+]]
@@ -678,9 +679,9 @@ define void @test6() {
 ; CHECK-NEXT:    [[INDVARS_IV_UNR_PH:%.*]] = phi i64 [ [[INDVARS_IV_NEXT_PROL]], [[LATCH_PROL]] ]
 ; CHECK-NEXT:    br label [[HEADER_PROL_LOOPEXIT]]
 ; CHECK:       header.prol.loopexit:
-; CHECK-NEXT:    [[INDVARS_IV_UNR:%.*]] = phi i64 [ undef, [[ENTRY:%.*]] ], [ [[INDVARS_IV_UNR_PH]], [[HEADER_PROL_LOOPEXIT_UNR_LCSSA]] ]
-; CHECK-NEXT:    [[TMP5:%.*]] = icmp ult i64 [[TMP2]], 3
-; CHECK-NEXT:    br i1 [[TMP5]], label [[LATCHEXIT:%.*]], label [[ENTRY_NEW:%.*]]
+; CHECK-NEXT:    [[INDVARS_IV_UNR:%.*]] = phi i64 [ [[START]], [[ENTRY:%.*]] ], [ [[INDVARS_IV_UNR_PH]], [[HEADER_PROL_LOOPEXIT_UNR_LCSSA]] ]
+; CHECK-NEXT:    [[TMP6:%.*]] = icmp ult i64 [[TMP3]], 3
+; CHECK-NEXT:    br i1 [[TMP6]], label [[LATCHEXIT:%.*]], label [[ENTRY_NEW:%.*]]
 ; CHECK:       entry.new:
 ; CHECK-NEXT:    br label [[HEADER:%.*]]
 ; CHECK:       header:
@@ -705,8 +706,8 @@ define void @test6() {
 ; CHECK-NEXT:    br i1 [[C1_3]], label [[LATCH_3]], label [[OTHEREXIT_LOOPEXIT]]
 ; CHECK:       latch.3:
 ; CHECK-NEXT:    [[INDVARS_IV_NEXT_3]] = add nsw i64 [[INDVARS_IV_NEXT_2]], 2
-; CHECK-NEXT:    [[TMP6:%.*]] = icmp slt i64 [[INDVARS_IV_NEXT_3]], 616
-; CHECK-NEXT:    br i1 [[TMP6]], label [[HEADER]], label [[LATCHEXIT_UNR_LCSSA:%.*]], !llvm.loop [[LOOP10:![0-9]+]]
+; CHECK-NEXT:    [[TMP7:%.*]] = icmp slt i64 [[INDVARS_IV_NEXT_3]], 616
+; CHECK-NEXT:    br i1 [[TMP7]], label [[HEADER]], label [[LATCHEXIT_UNR_LCSSA:%.*]], !llvm.loop [[LOOP10:![0-9]+]]
 ; CHECK:       latchexit.unr-lcssa:
 ; CHECK-NEXT:    br label [[LATCHEXIT]]
 ; CHECK:       latchexit:
@@ -728,7 +729,7 @@ entry:
   br label %header
 
 header:                                          ; preds = %latch, %entry
-  %indvars.iv = phi i64 [ undef, %entry ], [ %indvars.iv.next, %latch ]
+  %indvars.iv = phi i64 [ %start, %entry ], [ %indvars.iv.next, %latch ]
   %iv.i32 = trunc i64 %indvars.iv to i32
   %c1 = call i1 @unknown(i32 %iv.i32)
   br i1 %c1, label %latch, label %otherexit