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, 154 deletions

diff --git a/llvm/test/Transforms/LoopUnswitch/msan.ll b/llvm/test/Transforms/LoopUnswitch/msan.ll
deleted file mode 100644
index 194e64687be..00000000000
--- a/llvm/test/Transforms/LoopUnswitch/msan.ll
+++ /dev/null
@@ -1,154 +0,0 @@
-; RUN: opt < %s -loop-unswitch -verify-loop-info -S < %s 2>&1 | FileCheck %s
-; RUN: opt < %s -loop-unswitch -verify-loop-info -enable-mssa-loop-dependency=true -verify-memoryssa -S < %s 2>&1 | FileCheck %s
-
-@sink = global i32 0, align 4
-@y = global i64 0, align 8
-
-; The following is approximately:
-; void f(bool x, int p, int q) {
-;   volatile bool x2 = x;
-;   for (int i = 0; i < 1; ++i) {
-;     if (x2) {
-;       if (y)
-;         sink = p;
-;       else
-;         sink = q;
-;     }
-;   }
-; }
-; With MemorySanitizer, the loop can not be unswitched on "y", because "y" could
-; be uninitialized when x == false.
-; Test that the branch on "y" is inside the loop (after the first unconditional
-; branch).
-
-define void @may_not_execute(i1 zeroext %x, i32 %p, i32 %q) sanitize_memory {
-; CHECK-LABEL: @may_not_execute(
-entry:
-; CHECK: %[[Y:.*]] = load i64, i64* @y, align 8
-; CHECK: %[[YB:.*]] = icmp eq i64 %[[Y]], 0
-; CHECK-NOT: br i1
-; CHECK: br label
-; CHECK: br i1 %[[YB]]
-
-  %x2 = alloca i8, align 1
-  %frombool1 = zext i1 %x to i8
-  store volatile i8 %frombool1, i8* %x2, align 1
-  %0 = load i64, i64* @y, align 8
-  %tobool3 = icmp eq i64 %0, 0
-  br label %for.body
-
-for.body:
-  %i.01 = phi i32 [ 0, %entry ], [ %inc, %for.inc ]
-  %x2.0. = load volatile i8, i8* %x2, align 1
-  %tobool2 = icmp eq i8 %x2.0., 0
-  br i1 %tobool2, label %for.inc, label %if.then
-
-if.then:
-  br i1 %tobool3, label %if.else, label %if.then4
-
-if.then4:
-  store volatile i32 %p, i32* @sink, align 4
-  br label %for.inc
-
-if.else:
-  store volatile i32 %q, i32* @sink, align 4
-  br label %for.inc
-
-for.inc:
-  %inc = add nsw i32 %i.01, 1
-  %cmp = icmp slt i32 %inc, 1
-  br i1 %cmp, label %for.body, label %for.end
-
-for.end:
-  ret void
-}
-
-
-; The same as above, but "y" is a function parameter instead of a global.
-; This shows that it is not enough to suppress hoisting of load instructions,
-; the actual problem is in the speculative branching.
-
-define void @may_not_execute2(i1 zeroext %x, i1 zeroext %y, i32 %p, i32 %q) sanitize_memory {
-; CHECK-LABEL: @may_not_execute2(
-entry:
-; CHECK-NOT: br i1
-; CHECK: br label
-; CHECK: br i1 %y,
-  %x2 = alloca i8, align 1
-  %frombool2 = zext i1 %x to i8
-  store volatile i8 %frombool2, i8* %x2, align 1
-  br label %for.body
-
-for.body:
-  %i.01 = phi i32 [ 0, %entry ], [ %inc, %for.inc ]
-  %x2.0. = load volatile i8, i8* %x2, align 1
-  %tobool3 = icmp eq i8 %x2.0., 0
-  br i1 %tobool3, label %for.inc, label %if.then
-
-if.then:
-  br i1 %y, label %if.then5, label %if.else
-
-if.then5:
-  store volatile i32 %p, i32* @sink, align 4
-  br label %for.inc
-
-if.else:
-  store volatile i32 %q, i32* @sink, align 4
-  br label %for.inc
-
-for.inc:
-  %inc = add nsw i32 %i.01, 1
-  %cmp = icmp slt i32 %inc, 1
-  br i1 %cmp, label %for.body, label %for.end
-
-for.end:
-  ret void
-}
-
-
-; The following is approximately:
-; void f(bool x, int p, int q) {
-;   volatile bool x2 = x;
-;   for (int i = 0; i < 1; ++i) {
-;     if (y)
-;       sink = p;
-;     else
-;       sink = q;
-;   }
-; }
-; "if (y)" is guaranteed to execute; the loop can be unswitched.
-
-define void @must_execute(i1 zeroext %x, i32 %p, i32 %q) sanitize_memory {
-; CHECK-LABEL: @must_execute(
-entry:
-; CHECK:       %[[Y:.*]] = load i64, i64* @y, align 8
-; CHECK-NEXT:  %[[YB:.*]] = icmp eq i64 %[[Y]], 0
-; CHECK-NEXT:  br i1 %[[YB]],
-
-  %x2 = alloca i8, align 1
-  %frombool1 = zext i1 %x to i8
-  store volatile i8 %frombool1, i8* %x2, align 1
-  %0 = load i64, i64* @y, align 8
-  %tobool2 = icmp eq i64 %0, 0
-  br label %for.body
-
-for.body:
-  %i.01 = phi i32 [ 0, %entry ], [ %inc, %for.inc ]
-  br i1 %tobool2, label %if.else, label %if.then
-
-if.then:
-  store volatile i32 %p, i32* @sink, align 4
-  br label %for.inc
-
-if.else:
-  store volatile i32 %q, i32* @sink, align 4
-  br label %for.inc
-
-for.inc:
-  %inc = add nsw i32 %i.01, 1
-  %cmp = icmp slt i32 %inc, 1
-  br i1 %cmp, label %for.body, label %for.end
-
-for.end:
-  ret void
-}