Revert "Temporarily Revert "Add basic loop fusion pass.""

The reversion apparently deleted the test/Transforms directory.

Will be re-reverting again.

llvm-svn: 358552

1 files changed, 56 insertions, 0 deletions

diff --git a/llvm/test/Transforms/CodeGenPrepare/ARM/overflow-intrinsics.ll b/llvm/test/Transforms/CodeGenPrepare/ARM/overflow-intrinsics.ll
new file mode 100644
index 00000000000..3fbc2133141
--- /dev/null
+++ b/llvm/test/Transforms/CodeGenPrepare/ARM/overflow-intrinsics.ll
@@ -0,0 +1,56 @@
+; RUN: opt -codegenprepare -S < %s | FileCheck %s
+
+target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
+target triple = "thumbv8m.main-arm-none-eabi"
+
+; CHECK-LABEL: uadd_overflow_too_far_cmp_dom
+; CHECK-NOT: with.overflow.i32
+define i32 @uadd_overflow_too_far_cmp_dom(i32 %arg0) {
+entry:
+  %cmp = icmp ne i32 %arg0, 0
+  br i1 %cmp, label %if.else, label %if.then
+
+if.then:
+  call void @foo()
+  br label %exit
+
+if.else:
+  call void @bar()
+  br label %if.end
+
+if.end:
+  %dec = add nsw i32 %arg0, -1
+  br label %exit
+
+exit:
+  %res = phi i32 [ %arg0, %if.then ], [ %dec, %if.end ]
+  ret i32 %res
+}
+
+; CHECK-LABEL: uadd_overflow_too_far_math_dom
+; CHECK-NOT: with.overflow.i32
+define i32 @uadd_overflow_too_far_math_dom(i32 %arg0, i32 %arg1) {
+entry:
+  %dec = add nsw i32 %arg0, -1
+  %cmp = icmp ugt i32 %arg0, 1
+  br i1 %cmp, label %if.else, label %if.then
+
+if.then:
+  call void @foo()
+  br label %if.end
+
+if.else:
+  call void @bar()
+  br label %if.end
+
+if.end:
+  %cmp.i.i = icmp ne i32 %arg0, 0
+  %tobool = zext i1 %cmp.i.i to i32
+  br label %exit
+
+exit:
+  ret i32 %tobool
+}
+
+declare void @foo()
+declare void @bar()