[LoopUnroll] Use poison instead of undef for another preheader value

5 files changed, 20 insertions, 20 deletions

diff --git a/llvm/lib/Transforms/Utils/LoopUnrollRuntime.cpp b/llvm/lib/Transforms/Utils/LoopUnrollRuntime.cpp
index 01b653f..7ab0c5a 100644
--- a/llvm/lib/Transforms/Utils/LoopUnrollRuntime.cpp
+++ b/llvm/lib/Transforms/Utils/LoopUnrollRuntime.cpp
@@ -126,7 +126,7 @@ static void ConnectProlog(Loop *L, Value *BECount, unsigned Count,
                            PreHeader);
       } else {
         // Succ is LatchExit.
-        NewPN->addIncoming(UndefValue::get(PN.getType()), PreHeader);
+        NewPN->addIncoming(PoisonValue::get(PN.getType()), PreHeader);
       }
 
       Value *V = PN.getIncomingValueForBlock(Latch);
diff --git a/llvm/test/DebugInfo/unrolled-loop-remainder.ll b/llvm/test/DebugInfo/unrolled-loop-remainder.ll
index 6a7fe77..f2bd855 100644
--- a/llvm/test/DebugInfo/unrolled-loop-remainder.ll
+++ b/llvm/test/DebugInfo/unrolled-loop-remainder.ll
@@ -58,7 +58,7 @@ define i32 @func_c() local_unnamed_addr #0 !dbg !14 {
 ; CHECK-NEXT:    [[DOTUNR1_PH:%.*]] = phi i32 [ [[ADD_PROL]], [[FOR_BODY_PROL]] ], [ [[ADD_PROL_1]], [[FOR_BODY_PROL_1]] ], [ [[ADD_PROL_2]], [[FOR_BODY_PROL_2]] ]
 ; CHECK-NEXT:    br label [[FOR_BODY_PROL_LOOPEXIT]], !dbg [[DBG24]]
 ; CHECK:       for.body.prol.loopexit:
-; CHECK-NEXT:    [[DOTLCSSA_UNR:%.*]] = phi ptr [ undef, [[FOR_BODY_LR_PH]] ], [ [[DOTLCSSA_UNR_PH]], [[FOR_BODY_PROL_LOOPEXIT_UNR_LCSSA]] ]
+; CHECK-NEXT:    [[DOTLCSSA_UNR:%.*]] = phi ptr [ poison, [[FOR_BODY_LR_PH]] ], [ [[DOTLCSSA_UNR_PH]], [[FOR_BODY_PROL_LOOPEXIT_UNR_LCSSA]] ]
 ; CHECK-NEXT:    [[DOTUNR:%.*]] = phi ptr [ [[A_PROMOTED]], [[FOR_BODY_LR_PH]] ], [ [[DOTUNR_PH]], [[FOR_BODY_PROL_LOOPEXIT_UNR_LCSSA]] ]
 ; CHECK-NEXT:    [[DOTUNR1:%.*]] = phi i32 [ [[DOTPR]], [[FOR_BODY_LR_PH]] ], [ [[DOTUNR1_PH]], [[FOR_BODY_PROL_LOOPEXIT_UNR_LCSSA]] ]
 ; CHECK-NEXT:    [[TMP11:%.*]] = icmp ult i32 [[TMP3]], 3, !dbg [[DBG24]]
diff --git a/llvm/test/Transforms/LoopUnroll/runtime-exit-phi-scev-invalidation.ll b/llvm/test/Transforms/LoopUnroll/runtime-exit-phi-scev-invalidation.ll
index f93750e..a97b394 100644
--- a/llvm/test/Transforms/LoopUnroll/runtime-exit-phi-scev-invalidation.ll
+++ b/llvm/test/Transforms/LoopUnroll/runtime-exit-phi-scev-invalidation.ll
@@ -186,7 +186,7 @@ define void @pr56286(i64 %x, ptr %src, ptr %dst, ptr %ptr.src) !prof !0 {
 ; CHECK-NEXT:    [[INNER_1_IV_UNR_PH:%.*]] = phi i64 [ [[INNER_1_IV_NEXT_PROL]], [[INNER_1_LATCH_PROL]] ]
 ; CHECK-NEXT:    br label [[INNER_1_HEADER_PROL_LOOPEXIT]]
 ; CHECK:       inner.1.header.prol.loopexit:
-; CHECK-NEXT:    [[L_1_LCSSA_UNR:%.*]] = phi i32 [ undef, [[OUTER_HEADER]] ], [ [[L_1_LCSSA_UNR_PH]], [[INNER_1_HEADER_PROL_LOOPEXIT_UNR_LCSSA]] ]
+; CHECK-NEXT:    [[L_1_LCSSA_UNR:%.*]] = phi i32 [ poison, [[OUTER_HEADER]] ], [ [[L_1_LCSSA_UNR_PH]], [[INNER_1_HEADER_PROL_LOOPEXIT_UNR_LCSSA]] ]
 ; CHECK-NEXT:    [[INNER_1_IV_UNR:%.*]] = phi i64 [ [[X]], [[OUTER_HEADER]] ], [ [[INNER_1_IV_UNR_PH]], [[INNER_1_HEADER_PROL_LOOPEXIT_UNR_LCSSA]] ]
 ; CHECK-NEXT:    [[TMP4:%.*]] = icmp ult i64 [[TMP3]], 7
 ; CHECK-NEXT:    br i1 [[TMP4]], label [[OUTER_MIDDLE:%.*]], label [[OUTER_HEADER_NEW:%.*]], !prof [[PROF3]]
diff --git a/llvm/test/Transforms/LoopUnroll/runtime-loop-multiple-exits.ll b/llvm/test/Transforms/LoopUnroll/runtime-loop-multiple-exits.ll
index e918627..272e47b 100644
--- a/llvm/test/Transforms/LoopUnroll/runtime-loop-multiple-exits.ll
+++ b/llvm/test/Transforms/LoopUnroll/runtime-loop-multiple-exits.ll
@@ -595,7 +595,7 @@ define i32 @test2(ptr nocapture %a, i64 %n) {
 ; PROLOG-NEXT:    %sum.02.unr.ph = phi i32 [ %add.prol, %for.body.prol ]
 ; PROLOG-NEXT:    br label %header.prol.loopexit
 ; PROLOG:       header.prol.loopexit:
-; PROLOG-NEXT:    %sum.0.lcssa.unr = phi i32 [ undef, %entry ], [ %sum.0.lcssa.unr.ph, %header.prol.loopexit.unr-lcssa ]
+; PROLOG-NEXT:    %sum.0.lcssa.unr = phi i32 [ poison, %entry ], [ %sum.0.lcssa.unr.ph, %header.prol.loopexit.unr-lcssa ]
 ; PROLOG-NEXT:    %indvars.iv.unr = phi i64 [ 0, %entry ], [ %indvars.iv.unr.ph, %header.prol.loopexit.unr-lcssa ]
 ; PROLOG-NEXT:    %sum.02.unr = phi i32 [ 0, %entry ], [ %sum.02.unr.ph, %header.prol.loopexit.unr-lcssa ]
 ; PROLOG-NEXT:    %3 = icmp ult i64 %1, 7
@@ -713,7 +713,7 @@ define i32 @test2(ptr nocapture %a, i64 %n) {
 ; PROLOG-BLOCK-NEXT:    %2 = load i32, ptr %a, align 4
 ; PROLOG-BLOCK-NEXT:    br label %header.prol.loopexit
 ; PROLOG-BLOCK:       header.prol.loopexit:
-; PROLOG-BLOCK-NEXT:    %sum.0.lcssa.unr = phi i32 [ undef, %entry ], [ %2, %for.body.prol ]
+; PROLOG-BLOCK-NEXT:    %sum.0.lcssa.unr = phi i32 [ poison, %entry ], [ %2, %for.body.prol ]
 ; PROLOG-BLOCK-NEXT:    %indvars.iv.unr = phi i64 [ 0, %entry ], [ 1, %for.body.prol ]
 ; PROLOG-BLOCK-NEXT:    %sum.02.unr = phi i32 [ 0, %entry ], [ %2, %for.body.prol ]
 ; PROLOG-BLOCK-NEXT:    %3 = icmp ult i64 %1, 1
@@ -1440,7 +1440,7 @@ define i32 @hdr_latch_same_exit(ptr nocapture %a, i64 %n, i1 %cond) {
 ; PROLOG-NEXT:    %sum.02.unr.ph = phi i32 [ %add.prol, %latch.prol ]
 ; PROLOG-NEXT:    br label %header.prol.loopexit
 ; PROLOG:       header.prol.loopexit:
-; PROLOG-NEXT:    %result.unr = phi i32 [ undef, %entry ], [ %result.unr.ph, %header.prol.loopexit.unr-lcssa ]
+; PROLOG-NEXT:    %result.unr = phi i32 [ poison, %entry ], [ %result.unr.ph, %header.prol.loopexit.unr-lcssa ]
 ; PROLOG-NEXT:    %indvars.iv.unr = phi i64 [ 0, %entry ], [ %indvars.iv.unr.ph, %header.prol.loopexit.unr-lcssa ]
 ; PROLOG-NEXT:    %sum.02.unr = phi i32 [ 0, %entry ], [ %sum.02.unr.ph, %header.prol.loopexit.unr-lcssa ]
 ; PROLOG-NEXT:    %3 = icmp ult i64 %1, 7
@@ -1561,7 +1561,7 @@ define i32 @hdr_latch_same_exit(ptr nocapture %a, i64 %n, i1 %cond) {
 ; PROLOG-BLOCK-NEXT:    %2 = load i32, ptr %a, align 4
 ; PROLOG-BLOCK-NEXT:    br label %header.prol.loopexit
 ; PROLOG-BLOCK:       header.prol.loopexit:
-; PROLOG-BLOCK-NEXT:    %result.unr = phi i32 [ undef, %entry ], [ %2, %latch.prol ]
+; PROLOG-BLOCK-NEXT:    %result.unr = phi i32 [ poison, %entry ], [ %2, %latch.prol ]
 ; PROLOG-BLOCK-NEXT:    %indvars.iv.unr = phi i64 [ 0, %entry ], [ 1, %latch.prol ]
 ; PROLOG-BLOCK-NEXT:    %sum.02.unr = phi i32 [ 0, %entry ], [ %2, %latch.prol ]
 ; PROLOG-BLOCK-NEXT:    %3 = icmp ult i64 %1, 1
@@ -1880,7 +1880,7 @@ define i32 @otherblock_latch_same_exit(ptr nocapture %a, i64 %n, i1 %cond) {
 ; PROLOG-NEXT:    %sum.02.unr.ph = phi i32 [ %add.prol, %latch.prol ]
 ; PROLOG-NEXT:    br label %header.prol.loopexit
 ; PROLOG:       header.prol.loopexit:
-; PROLOG-NEXT:    %result.unr = phi i32 [ undef, %entry ], [ %result.unr.ph, %header.prol.loopexit.unr-lcssa ]
+; PROLOG-NEXT:    %result.unr = phi i32 [ poison, %entry ], [ %result.unr.ph, %header.prol.loopexit.unr-lcssa ]
 ; PROLOG-NEXT:    %indvars.iv.unr = phi i64 [ 0, %entry ], [ %indvars.iv.unr.ph, %header.prol.loopexit.unr-lcssa ]
 ; PROLOG-NEXT:    %sum.02.unr = phi i32 [ 0, %entry ], [ %sum.02.unr.ph, %header.prol.loopexit.unr-lcssa ]
 ; PROLOG-NEXT:    %3 = icmp ult i64 %1, 7
@@ -2001,7 +2001,7 @@ define i32 @otherblock_latch_same_exit(ptr nocapture %a, i64 %n, i1 %cond) {
 ; PROLOG-BLOCK-NEXT:    %2 = load i32, ptr %a, align 4
 ; PROLOG-BLOCK-NEXT:    br label %header.prol.loopexit
 ; PROLOG-BLOCK:       header.prol.loopexit:
-; PROLOG-BLOCK-NEXT:    %result.unr = phi i32 [ undef, %entry ], [ %2, %latch.prol ]
+; PROLOG-BLOCK-NEXT:    %result.unr = phi i32 [ poison, %entry ], [ %2, %latch.prol ]
 ; PROLOG-BLOCK-NEXT:    %indvars.iv.unr = phi i64 [ 0, %entry ], [ 1, %latch.prol ]
 ; PROLOG-BLOCK-NEXT:    %sum.02.unr = phi i32 [ 0, %entry ], [ %2, %latch.prol ]
 ; PROLOG-BLOCK-NEXT:    %3 = icmp ult i64 %1, 1
@@ -2321,7 +2321,7 @@ define i32 @otherblock_latch_same_exit2(ptr nocapture %a, i64 %n, i1 %cond) {
 ; PROLOG-NEXT:    %sum.02.unr.ph = phi i32 [ %add.prol, %latch.prol ]
 ; PROLOG-NEXT:    br label %header.prol.loopexit
 ; PROLOG:       header.prol.loopexit:
-; PROLOG-NEXT:    %result.unr = phi i32 [ undef, %entry ], [ %result.unr.ph, %header.prol.loopexit.unr-lcssa ]
+; PROLOG-NEXT:    %result.unr = phi i32 [ poison, %entry ], [ %result.unr.ph, %header.prol.loopexit.unr-lcssa ]
 ; PROLOG-NEXT:    %indvars.iv.unr = phi i64 [ 0, %entry ], [ %indvars.iv.unr.ph, %header.prol.loopexit.unr-lcssa ]
 ; PROLOG-NEXT:    %sum.02.unr = phi i32 [ 0, %entry ], [ %sum.02.unr.ph, %header.prol.loopexit.unr-lcssa ]
 ; PROLOG-NEXT:    %3 = icmp ult i64 %1, 7
@@ -2442,7 +2442,7 @@ define i32 @otherblock_latch_same_exit2(ptr nocapture %a, i64 %n, i1 %cond) {
 ; PROLOG-BLOCK-NEXT:    %2 = load i32, ptr %a, align 4
 ; PROLOG-BLOCK-NEXT:    br label %header.prol.loopexit
 ; PROLOG-BLOCK:       header.prol.loopexit:
-; PROLOG-BLOCK-NEXT:    %result.unr = phi i32 [ undef, %entry ], [ %2, %latch.prol ]
+; PROLOG-BLOCK-NEXT:    %result.unr = phi i32 [ poison, %entry ], [ %2, %latch.prol ]
 ; PROLOG-BLOCK-NEXT:    %indvars.iv.unr = phi i64 [ 0, %entry ], [ 1, %latch.prol ]
 ; PROLOG-BLOCK-NEXT:    %sum.02.unr = phi i32 [ 0, %entry ], [ %2, %latch.prol ]
 ; PROLOG-BLOCK-NEXT:    %3 = icmp ult i64 %1, 1
@@ -2763,7 +2763,7 @@ define i32 @otherblock_latch_same_exit3(ptr nocapture %a, i64 %n, i1 %cond) {
 ; PROLOG-NEXT:    %sum.02.unr.ph = phi i32 [ %add.prol, %latch.prol ]
 ; PROLOG-NEXT:    br label %header.prol.loopexit
 ; PROLOG:       header.prol.loopexit:
-; PROLOG-NEXT:    %result.unr = phi i32 [ undef, %entry ], [ %result.unr.ph, %header.prol.loopexit.unr-lcssa ]
+; PROLOG-NEXT:    %result.unr = phi i32 [ poison, %entry ], [ %result.unr.ph, %header.prol.loopexit.unr-lcssa ]
 ; PROLOG-NEXT:    %indvars.iv.unr = phi i64 [ 0, %entry ], [ %indvars.iv.unr.ph, %header.prol.loopexit.unr-lcssa ]
 ; PROLOG-NEXT:    %sum.02.unr = phi i32 [ 0, %entry ], [ %sum.02.unr.ph, %header.prol.loopexit.unr-lcssa ]
 ; PROLOG-NEXT:    %3 = icmp ult i64 %1, 7
@@ -2884,7 +2884,7 @@ define i32 @otherblock_latch_same_exit3(ptr nocapture %a, i64 %n, i1 %cond) {
 ; PROLOG-BLOCK:       latch.prol:
 ; PROLOG-BLOCK-NEXT:    br label %header.prol.loopexit
 ; PROLOG-BLOCK:       header.prol.loopexit:
-; PROLOG-BLOCK-NEXT:    %result.unr = phi i32 [ undef, %entry ], [ %2, %latch.prol ]
+; PROLOG-BLOCK-NEXT:    %result.unr = phi i32 [ poison, %entry ], [ %2, %latch.prol ]
 ; PROLOG-BLOCK-NEXT:    %indvars.iv.unr = phi i64 [ 0, %entry ], [ 1, %latch.prol ]
 ; PROLOG-BLOCK-NEXT:    %sum.02.unr = phi i32 [ 0, %entry ], [ %2, %latch.prol ]
 ; PROLOG-BLOCK-NEXT:    %3 = icmp ult i64 %1, 1
@@ -3171,7 +3171,7 @@ define void @unique_exit(i32 %N, i32 %M) {
 ; PROLOG-NEXT:    br label %header.prol.loopexit
 ; PROLOG:       header.prol.loopexit:
 ; PROLOG-NEXT:    %i4.unr = phi i32 [ 0, %preheader ], [ %i4.unr.ph, %header.prol.loopexit.unr-lcssa ]
-; PROLOG-NEXT:    %i2.ph.unr = phi i32 [ undef, %preheader ], [ %i2.ph.unr.ph, %header.prol.loopexit.unr-lcssa ]
+; PROLOG-NEXT:    %i2.ph.unr = phi i32 [ poison, %preheader ], [ %i2.ph.unr.ph, %header.prol.loopexit.unr-lcssa ]
 ; PROLOG-NEXT:    %2 = icmp ult i32 %1, 7
 ; PROLOG-NEXT:    br i1 %2, label %latchExit, label %preheader.new
 ; PROLOG:       preheader.new:
@@ -3243,7 +3243,7 @@ define void @unique_exit(i32 %N, i32 %M) {
 ; PROLOG-BLOCK-NEXT:    br label %header.prol.loopexit
 ; PROLOG-BLOCK:       header.prol.loopexit:
 ; PROLOG-BLOCK-NEXT:    %i4.unr = phi i32 [ 0, %preheader ], [ 1, %latch.prol ]
-; PROLOG-BLOCK-NEXT:    %i2.ph.unr = phi i32 [ undef, %preheader ], [ -1, %latch.prol ]
+; PROLOG-BLOCK-NEXT:    %i2.ph.unr = phi i32 [ poison, %preheader ], [ -1, %latch.prol ]
 ; PROLOG-BLOCK-NEXT:    %2 = icmp ult i32 %1, 1
 ; PROLOG-BLOCK-NEXT:    br i1 %2, label %latchExit, label %preheader.new
 ; PROLOG-BLOCK:       preheader.new:
@@ -3544,7 +3544,7 @@ define i64 @test5(i64 %trip, i64 %add, i1 %cond) {
 ; PROLOG:       loop_header.prol.loopexit:
 ; PROLOG-NEXT:    %iv.unr = phi i64 [ 0, %entry ], [ %iv.unr.ph, %loop_header.prol.loopexit.unr-lcssa ]
 ; PROLOG-NEXT:    %sum.unr = phi i64 [ 0, %entry ], [ %sum.unr.ph, %loop_header.prol.loopexit.unr-lcssa ]
-; PROLOG-NEXT:    %sum.next.lcssa.unr = phi i64 [ undef, %entry ], [ %sum.next.lcssa.unr.ph, %loop_header.prol.loopexit.unr-lcssa ]
+; PROLOG-NEXT:    %sum.next.lcssa.unr = phi i64 [ poison, %entry ], [ %sum.next.lcssa.unr.ph, %loop_header.prol.loopexit.unr-lcssa ]
 ; PROLOG-NEXT:    %2 = icmp ult i64 %1, 7
 ; PROLOG-NEXT:    br i1 %2, label %latchexit, label %entry.new
 ; PROLOG:       entry.new:
@@ -3671,7 +3671,7 @@ define i64 @test5(i64 %trip, i64 %add, i1 %cond) {
 ; PROLOG-BLOCK:       loop_header.prol.loopexit:
 ; PROLOG-BLOCK-NEXT:    %iv.unr = phi i64 [ 0, %entry ], [ 1, %loop_latch.prol ]
 ; PROLOG-BLOCK-NEXT:    %sum.unr = phi i64 [ 0, %entry ], [ %add, %loop_latch.prol ]
-; PROLOG-BLOCK-NEXT:    %sum.next.lcssa.unr = phi i64 [ undef, %entry ], [ %add, %loop_latch.prol ]
+; PROLOG-BLOCK-NEXT:    %sum.next.lcssa.unr = phi i64 [ poison, %entry ], [ %add, %loop_latch.prol ]
 ; PROLOG-BLOCK-NEXT:    %2 = icmp ult i64 %1, 1
 ; PROLOG-BLOCK-NEXT:    br i1 %2, label %latchexit, label %entry.new
 ; PROLOG-BLOCK:       entry.new:
@@ -3991,7 +3991,7 @@ define i32 @test6(ptr nocapture %a, i64 %n, i1 %cond, i32 %x) {
 ; PROLOG-NEXT:    %sum.02.unr.ph = phi i32 [ %add.prol, %latch.prol ]
 ; PROLOG-NEXT:    br label %header.prol.loopexit
 ; PROLOG:       header.prol.loopexit:
-; PROLOG-NEXT:    %sum.0.lcssa.unr = phi i32 [ undef, %entry ], [ %sum.0.lcssa.unr.ph, %header.prol.loopexit.unr-lcssa ]
+; PROLOG-NEXT:    %sum.0.lcssa.unr = phi i32 [ poison, %entry ], [ %sum.0.lcssa.unr.ph, %header.prol.loopexit.unr-lcssa ]
 ; PROLOG-NEXT:    %indvars.iv.unr = phi i64 [ 0, %entry ], [ %indvars.iv.unr.ph, %header.prol.loopexit.unr-lcssa ]
 ; PROLOG-NEXT:    %sum.02.unr = phi i32 [ 0, %entry ], [ %sum.02.unr.ph, %header.prol.loopexit.unr-lcssa ]
 ; PROLOG-NEXT:    %2 = icmp ult i64 %1, 7
@@ -4114,7 +4114,7 @@ define i32 @test6(ptr nocapture %a, i64 %n, i1 %cond, i32 %x) {
 ; PROLOG-BLOCK-NEXT:    %load.prol = load i32, ptr %a, align 4
 ; PROLOG-BLOCK-NEXT:    br label %header.prol.loopexit
 ; PROLOG-BLOCK:       header.prol.loopexit:
-; PROLOG-BLOCK-NEXT:    %sum.0.lcssa.unr = phi i32 [ undef, %entry ], [ %load.prol, %latch.prol ]
+; PROLOG-BLOCK-NEXT:    %sum.0.lcssa.unr = phi i32 [ poison, %entry ], [ %load.prol, %latch.prol ]
 ; PROLOG-BLOCK-NEXT:    %indvars.iv.unr = phi i64 [ 0, %entry ], [ 1, %latch.prol ]
 ; PROLOG-BLOCK-NEXT:    %sum.02.unr = phi i32 [ 0, %entry ], [ %load.prol, %latch.prol ]
 ; PROLOG-BLOCK-NEXT:    %2 = icmp ult i64 %1, 1
diff --git a/llvm/test/Transforms/LoopUnroll/tripcount-overflow.ll b/llvm/test/Transforms/LoopUnroll/tripcount-overflow.ll
index 972a2bf..1481286 100644
--- a/llvm/test/Transforms/LoopUnroll/tripcount-overflow.ll
+++ b/llvm/test/Transforms/LoopUnroll/tripcount-overflow.ll
@@ -57,7 +57,7 @@ define i32 @foo(i32 %N) {
 ; PROLOG:       while.body.prol:
 ; PROLOG-NEXT:    br label [[WHILE_BODY_PROL_LOOPEXIT]]
 ; PROLOG:       while.body.prol.loopexit:
-; PROLOG-NEXT:    [[I_LCSSA_UNR:%.*]] = phi i32 [ undef, [[ENTRY:%.*]] ], [ 0, [[WHILE_BODY_PROL]] ]
+; PROLOG-NEXT:    [[I_LCSSA_UNR:%.*]] = phi i32 [ poison, [[ENTRY:%.*]] ], [ 0, [[WHILE_BODY_PROL]] ]
 ; PROLOG-NEXT:    [[I_UNR:%.*]] = phi i32 [ 0, [[ENTRY]] ], [ 1, [[WHILE_BODY_PROL]] ]
 ; PROLOG-NEXT:    [[TMP1:%.*]] = icmp ult i32 [[N]], 1
 ; PROLOG-NEXT:    br i1 [[TMP1]], label [[WHILE_END:%.*]], label [[ENTRY_NEW:%.*]]