Revert r275883 and r275891. They seem to cause PR28608.

Revert "[LoopSimplify] Update LCSSA after separating nested loops."

This reverts commit r275891.

Revert "[LCSSA] Post-process PHI-nodes created by SSAUpdate when constructing LCSSA form."

This reverts commit r275883.

llvm-svn: 276064

1 files changed, 0 insertions, 76 deletions

diff --git a/llvm/test/Transforms/LoopSimplify/pr28272.ll b/llvm/test/Transforms/LoopSimplify/pr28272.ll
deleted file mode 100644
index 49990f92cab..00000000000
--- a/llvm/test/Transforms/LoopSimplify/pr28272.ll
+++ /dev/null
@@ -1,76 +0,0 @@
-; RUN: opt < %s -lcssa -loop-unroll -S | FileCheck %s
-target triple = "x86_64-unknown-linux-gnu"
-
-; PR28272
-; When LoopSimplify separates nested loops, it might break LCSSA form: values
-; from the original loop might be used in the outer loop. This test invokes
-; loop-unroll, which calls loop-simplify before itself. If LCSSA is broken
-; after loop-simplify, we crash on assertion.
-
-; CHECK-LABEL: @foo
-define void @foo() {
-entry:
-  br label %header
-
-header:
-  br label %loop1
-
-loop1:
-  br i1 true, label %loop1, label %bb43
-
-bb43:
-  %a = phi i32 [ undef, %loop1 ], [ 0, %bb45 ], [ %a, %bb54 ]
-  %b = phi i32 [ 0, %loop1 ], [ 1, %bb54 ], [ %c, %bb45 ]
-  br i1 true, label %bb114, label %header
-
-bb114:
-  %c = add i32 0, 1
-  %d = add i32 0, 1
-  br i1 true, label %bb45, label %bb54
-
-bb45:
-  %x = add i32 %d, 0
-  br label %bb43
-
-bb54:
-  br label %bb43
-}
-
-; CHECK-LABEL: @foo2
-define void @foo2() {
-entry:
-  br label %outer
-
-outer.loopexit:
-  br label %outer
-
-outer:
-  br label %loop1
-
-loop1:
-  br i1 true, label %loop1, label %loop2.preheader
-
-loop2.preheader:
-  %a.ph = phi i32 [ undef, %loop1 ]
-  %b.ph = phi i32 [ 0, %loop1 ]
-  br label %loop2
-
-loop2:
-  %a = phi i32 [ 0, %loop2.if.true ], [ %a, %loop2.if.false ], [ %a.ph, %loop2.preheader ], [0, %bb]
-  %b = phi i32 [ 1, %loop2.if.false ], [ %c, %loop2.if.true ], [ %b.ph, %loop2.preheader ], [%c, %bb]
-  br i1 true, label %loop2.if, label %outer.loopexit
-
-loop2.if:
-  %c = add i32 0, 1
-  switch i32 undef, label %loop2.if.false [i32 0, label %loop2.if.true
-                                       i32 1, label %bb]
-
-loop2.if.true:
-  br i1 undef, label %loop2, label %bb
-
-loop2.if.false:
-  br label %loop2
-
-bb:
-  br label %loop2
-}