Temporarily Revert "Add basic loop fusion pass."

As it's causing some bot failures (and per request from kbarton).

This reverts commit r358543/ab70da07286e618016e78247e4a24fcb84077fda.

llvm-svn: 358546

1 files changed, 0 insertions, 43 deletions

diff --git a/llvm/test/Transforms/LoopStrengthReduce/scev-after-loopinstsimplify.ll b/llvm/test/Transforms/LoopStrengthReduce/scev-after-loopinstsimplify.ll
deleted file mode 100644
index a0dcaadd81b..00000000000
--- a/llvm/test/Transforms/LoopStrengthReduce/scev-after-loopinstsimplify.ll
+++ /dev/null
@@ -1,43 +0,0 @@
-; RUN: opt %s -indvars -loop-instsimplify -loop-reduce
-; We are only checking that there is no crash!
-
-; https://bugs.llvm.org/show_bug.cgi?id=37936
-
-; The problem is as follows:
-; 1. indvars marks %dec as NUW.
-; 2. loop-instsimplify runs instsimplify, which constant-folds %dec to -1
-; 3. loop-reduce tries to do some further modification, but crashes
-;    with an type assertion in cast, because %dec is no longer an Instruction,
-;    even though the SCEV data indicated it was.
-
-; If the runline is split into two, i.e. -indvars -loop-instsimplify first, that
-; stored into a file, and then -loop-reduce is run on that, there is no crash.
-; So it looks like the problem is due to -loop-instsimplify not discarding SCEV.
-
-target datalayout = "n16"
-
-@a = external global i16, align 1
-
-define void @f1() {
-entry:
-  br label %for.cond
-
-for.cond:                                         ; preds = %land.end, %entry
-  %c.0 = phi i16 [ 0, %entry ], [ %dec, %land.end ]
-  br i1 undef, label %for.body, label %for.cond.cleanup
-
-for.cond.cleanup:                                 ; preds = %for.cond
-  ret void
-
-for.body:                                         ; preds = %for.cond
-  %0 = load i16, i16* @a, align 1
-  %cmp = icmp sgt i16 %0, %c.0
-  br i1 %cmp, label %land.rhs, label %land.end
-
-land.rhs:                                         ; preds = %for.body
-  unreachable
-
-land.end:                                         ; preds = %for.body
-  %dec = add nsw i16 %c.0, -1
-  br label %for.cond
-}