Imported Upstream version 5.18.0.167

Former-commit-id: 289509151e0fee68a1b591a20c9f109c3c789d3a

external/llvm/test/Transforms/SimpleLoopUnswitch/msan.ll

@@ -1,141 +0,0 @@
-; RUN: opt -passes='loop(unswitch),verify<loops>' -S < %s | FileCheck %s
-
-declare void @unknown()
-declare void @unknown2()
-
-@y = global i64 0, align 8
-
-; The following is approximately:
-; void f(bool *x) {
-;   for (int i = 0; i < 1; ++i) {
-;     if (*x) {
-;       if (y)
-;         unknown();
-;       else
-;         break;
-;     }
-;   }
-; }
-; 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_trivial(i1* %x) sanitize_memory {
-; CHECK-LABEL: @may_not_execute_trivial(
-entry:
-  %y = load i64, i64* @y, align 8
-  %y.cmp = icmp eq i64 %y, 0
-  br label %for.body
-; CHECK: %[[Y:.*]] = load i64, i64* @y
-; CHECK: %[[YCMP:.*]] = icmp eq i64 %[[Y]], 0
-; CHECK-NOT: br i1
-; CHECK: br label %for.body
-
-for.body:
-  %i = phi i32 [ 0, %entry ], [ %inc, %for.inc ]
-  %x.load = load i1, i1* %x
-  br i1 %x.load, label %for.inc, label %if.then
-; CHECK: %[[XLOAD:.*]] = load i1, i1* %x
-; CHECK: br i1 %[[XLOAD]]
-
-if.then:
-  br i1 %y.cmp, label %for.end, label %if.then4
-; CHECK: br i1 %[[YCMP]]
-
-if.then4:
-  call void @unknown()
-  br label %for.inc
-
-for.inc:
-  %inc = add nsw i32 %i, 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_trivial(i1* %x, i1 %y) sanitize_memory {
-; CHECK-LABEL: @may_not_execute2_trivial(
-entry:
-  br label %for.body
-; CHECK-NOT: br i1
-; CHECK: br label %for.body
-
-for.body:
-  %i = phi i32 [ 0, %entry ], [ %inc, %for.inc ]
-  %x.load = load i1, i1* %x
-  br i1 %x.load, label %for.inc, label %if.then
-; CHECK: %[[XLOAD:.*]] = load i1, i1* %x
-; CHECK: br i1 %[[XLOAD]]
-
-if.then:
-  br i1 %y, label %for.end, label %if.then4
-; CHECK: br i1 %y
-
-if.then4:
-  call void @unknown()
-  br label %for.inc
-
-for.inc:
-  %inc = add nsw i32 %i, 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() {
-;   for (int i = 0; i < 1; ++i) {
-;     if (y)
-;       unknown();
-;     else
-;       break;
-;   }
-; }
-; "if (y)" is guaranteed to execute; the loop can be unswitched.
-
-define void @must_execute_trivial() sanitize_memory {
-; CHECK-LABEL: @must_execute_trivial(
-entry:
-  %y = load i64, i64* @y, align 8
-  %y.cmp = icmp eq i64 %y, 0
-  br label %for.body
-; CHECK:   %[[Y:.*]] = load i64, i64* @y
-; CHECK:   %[[YCMP:.*]] = icmp eq i64 %[[Y]], 0
-; CHECK:   br i1 %[[YCMP]], label %[[EXIT_SPLIT:.*]], label %[[PH:.*]]
-;
-; CHECK: [[PH]]:
-; CHECK:   br label %for.body
-
-for.body:
-  %i = phi i32 [ 0, %entry ], [ %inc, %for.inc ]
-  br i1 %y.cmp, label %for.end, label %if.then4
-; CHECK: br label %if.then4
-
-if.then4:
-  call void @unknown()
-  br label %for.inc
-
-for.inc:
-  %inc = add nsw i32 %i, 1
-  %cmp = icmp slt i32 %inc, 1
-  br i1 %cmp, label %for.body, label %for.end
-
-for.end:
-  ret void
-; CHECK: for.end:
-; CHECK:   br label %[[EXIT_SPLIT]]
-;
-; CHECK: [[EXIT_SPLIT]]:
-; CHECK:   ret void
-}