[NewGVN] Add test cases for remaining known issues.

This patch adds IR tests for the known NewGVN issues. The intention is
that adding them now will make it easier to keep track of fixes.

diff --git a/llvm/test/Transforms/NewGVN/todo-pr33165-distribute-undef.ll b/llvm/test/Transforms/NewGVN/todo-pr33165-distribute-undef.ll
new file mode 100644 (file)
index 0000000..0a9255c
--- /dev/null
+++ b/llvm/test/Transforms/NewGVN/todo-pr33165-distribute-undef.ll
@@ -0,0 +1,17 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt -newgvn -S %s | FileCheck %s
+
+; Test for PR33165.
+
+; TODO: Currently NewGVN miscompiles the function.
+define i2 @f(i2, i1) {
+; CHECK-LABEL: @f(
+; CHECK-NEXT:    [[A:%.*]] = xor i2 [[TMP0:%.*]], -1
+; CHECK-NEXT:    [[B:%.*]] = select i1 [[TMP1:%.*]], i2 [[A]], i2 undef
+; CHECK-NEXT:    ret i2 [[B]]
+;
+  %a = xor i2 %0, -1
+  %b = select i1 %1, i2 %a, i2 undef
+  %c = and i2 %a, %b
+  ret i2 %c
+}

diff --git a/llvm/test/Transforms/NewGVN/todo-pr35074-phi-of-ops.ll b/llvm/test/Transforms/NewGVN/todo-pr35074-phi-of-ops.ll
new file mode 100644 (file)
index 0000000..e80292e
--- /dev/null
+++ b/llvm/test/Transforms/NewGVN/todo-pr35074-phi-of-ops.ll
@@ -0,0 +1,35 @@
+; RUN: opt -newgvn -S %s | FileCheck %s
+
+XFAIL: *
+
+; TODO: Test case for PR35074. Crashes caused by phi-of-ops.
+define void @crash1_pr35074(i32 %this, i1 %c) {
+entry:
+  br label %for.cond
+
+for.cond:                                         ; preds = %for.inc6, %entry
+  %y.0 = phi i32 [ 1, %entry ], [ %inc7, %for.inc6 ]
+  br i1 %c, label %for.inc6, label %for.body.lr.ph
+
+for.body.lr.ph:                                   ; preds = %for.cond
+  %sub = add nsw i32 %y.0, -1
+  br label %for.body4
+
+for.body4:                                        ; preds = %for.body.lr.ph
+  %cmp = icmp ugt i32 %sub, %y.0
+  br i1 %cmp, label %for.end, label %for.body4.1
+
+for.end:                                          ; preds = %for.body4.1, %for.body4
+  ret void
+
+for.inc6:                                         ; preds = %for.cond
+  %inc7 = add nuw nsw i32 %y.0, 1
+  br label %for.cond
+
+for.body4.1:                                      ; preds = %for.body4
+  %inc.1 = add nuw nsw i32 %y.0, 1
+  tail call void @_blah(i32 %inc.1)
+  br label %for.end
+}
+
+declare void @_blah(i32)

diff --git a/llvm/test/Transforms/NewGVN/todo-pr36335-phi-undef.ll b/llvm/test/Transforms/NewGVN/todo-pr36335-phi-undef.ll
new file mode 100644 (file)
index 0000000..6208f4e
--- /dev/null
+++ b/llvm/test/Transforms/NewGVN/todo-pr36335-phi-undef.ll
@@ -0,0 +1,32 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt -newgvn -S %s | FileCheck %s
+
+; TODO: NewGVN currently miscomiles the function below. PR36335.
+
+declare void @foo(i32)
+
+define void @main(i1 %c1, i1 %c2, i32 %x) {
+; CHECK-LABEL: @main(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    br i1 [[C1:%.*]], label [[L:%.*]], label [[END:%.*]]
+; CHECK:       L:
+; CHECK-NEXT:    [[XOR:%.*]] = xor i32 [[X:%.*]], -1
+; CHECK-NEXT:    call void @foo(i32 [[XOR]])
+; CHECK-NEXT:    br label [[L]]
+; CHECK:       end:
+; CHECK-NEXT:    ret void
+;
+entry:
+  br i1 %c1, label %L, label %end
+
+L:
+  %d.1 = phi i8 [ undef, %entry ], [ -1, %L ]
+  %conv = sext i8 %d.1 to i32
+  %xor = xor i32 %x, %conv
+  %neg = xor i32 %xor, -1
+  call void @foo(i32 %neg)
+  br label %L
+
+end:
+  ret void
+}

diff --git a/llvm/test/Transforms/NewGVN/todo-pr37121-seens-this-value-a-lot.ll b/llvm/test/Transforms/NewGVN/todo-pr37121-seens-this-value-a-lot.ll
new file mode 100644 (file)
index 0000000..b4961fa
--- /dev/null
+++ b/llvm/test/Transforms/NewGVN/todo-pr37121-seens-this-value-a-lot.ll
@@ -0,0 +1,25 @@
+; RUN: opt -newgvn -S %s | FileCheck %s
+
+; XFAIL: *
+
+; TODO: Current NewGVN crashes on the function below. See PR37121.
+
+define hidden void @foo() {
+top:
+  %.promoted = load i8, i8* undef, align 8
+  br label %if
+
+;; This is really a multi-valued phi, because the phi is defined by an expression of the phi.
+;; This means that we can't propagate the value over the backedge, because we'll just cycle
+;; through every value.
+
+if:                                               ; preds = %if, %top
+  %0 = phi i8 [ %1, %if ], [ %.promoted, %top ]
+  %1 = xor i8 %0, undef
+  br i1 false, label %L50, label %if
+
+L50:                                              ; preds = %if
+  %.lcssa = phi i8 [ %1, %if ]
+  store i8 %.lcssa, i8* undef, align 8
+  ret void
+}

diff --git a/llvm/test/Transforms/NewGVN/todo-pr42422-phi-of-ops.ll b/llvm/test/Transforms/NewGVN/todo-pr42422-phi-of-ops.ll
new file mode 100644 (file)
index 0000000..6c4cf5f
--- /dev/null
+++ b/llvm/test/Transforms/NewGVN/todo-pr42422-phi-of-ops.ll
@@ -0,0 +1,84 @@
+; RUN: opt -newgvn -S %s | FileChecks %s
+
+; XFAIL: *
+
+; TODO: Currently NewGVN crashes on the function below, see PR42422.
+
+define void @d() {
+entry:
+  br label %for.cond
+
+for.cond:                                         ; preds = %cleanup20, %entry
+  br label %for.cond1
+
+for.cond1:                                        ; preds = %for.inc17, %for.cond
+  %0 = phi i32 [ %inc18, %for.inc17 ], [ 0, %for.cond ]
+  %cmp = icmp sle i32 %0, 1
+  br i1 %cmp, label %for.body, label %for.end19
+
+for.body:                                         ; preds = %for.cond1
+  br i1 undef, label %for.body3, label %for.body.for.cond4_crit_edge
+
+for.body.for.cond4_crit_edge:                     ; preds = %for.body
+  br label %for.cond4
+
+for.body3:                                        ; preds = %for.body
+  br label %cleanup14
+
+for.cond4:                                        ; preds = %cleanup, %for.body.for.cond4_crit_edge
+  br i1 undef, label %if.then, label %if.end
+
+if.then:                                          ; preds = %for.cond4
+  br label %cleanup
+
+if.end:                                           ; preds = %for.cond4
+  br label %for.cond6
+
+for.cond6:                                        ; preds = %for.inc, %if.end
+  %1 = phi i64 [ %inc, %for.inc ], [ 0, %if.end ]
+  %cmp7 = icmp sle i64 %1, 1
+  br i1 %cmp7, label %for.inc, label %for.end9
+
+for.inc:                                          ; preds = %for.cond6
+  %inc = add nsw i64 %1, 1
+  br label %for.cond6
+
+for.end9:                                         ; preds = %for.cond6
+  br i1 true, label %if.then11, label %if.end12
+
+if.then11:                                        ; preds = %for.end9
+  br label %cleanup
+
+if.end12:                                         ; preds = %for.end9
+  br label %cleanup
+
+cleanup:                                          ; preds = %if.end12, %if.then11, %if.then
+  %cleanup.dest = phi i32 [ undef, %if.end12 ], [ 1, %if.then11 ], [ 9, %if.then ]
+  switch i32 %cleanup.dest, label %cleanup14 [
+    i32 0, label %for.cond4
+    i32 9, label %for.end13
+  ]
+
+for.end13:                                        ; preds = %cleanup
+  br label %cleanup14
+
+cleanup14:                                        ; preds = %for.end13, %cleanup, %for.body3
+  %cleanup.dest15 = phi i32 [ 0, %for.end13 ], [ %cleanup.dest, %cleanup ], [ 1, %for.body3 ]
+  %cond1 = icmp eq i32 %cleanup.dest15, 0
+  br i1 %cond1, label %for.inc17, label %cleanup20
+
+for.inc17:                                        ; preds = %cleanup14
+  %inc18 = add nsw i32 %0, 1
+  br label %for.cond1
+
+for.end19:                                        ; preds = %for.cond1
+  br label %cleanup20
+
+cleanup20:                                        ; preds = %for.end19, %cleanup14
+  %cleanup.dest21 = phi i32 [ %cleanup.dest15, %cleanup14 ], [ 0, %for.end19 ]
+  %cond = icmp eq i32 %cleanup.dest21, 0
+  br i1 %cond, label %for.cond, label %cleanup23
+
+cleanup23:                                        ; preds = %cleanup20
+  ret void
+}