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, 75 insertions, 0 deletions

diff --git a/llvm/test/Transforms/Inline/byval-tail-call.ll b/llvm/test/Transforms/Inline/byval-tail-call.ll
new file mode 100644
index 00000000000..8aafe7943f4
--- /dev/null
+++ b/llvm/test/Transforms/Inline/byval-tail-call.ll
@@ -0,0 +1,75 @@
+; RUN: opt < %s -basicaa -tailcallelim -inline -instcombine -dse -S | FileCheck %s
+; RUN: opt < %s -aa-pipeline=basic-aa -passes='function(tailcallelim),cgscc(inline,function(instcombine,dse))' -S | FileCheck %s
+; PR7272
+
+; Calls that capture byval parameters cannot be marked as tail calls. Other
+; tails that don't capture byval parameters can still be tail calls.
+
+target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:32:32-n8:16:32"
+target triple = "i386-pc-linux-gnu"
+
+declare void @ext(i32*)
+
+define void @bar(i32* byval %x) {
+  call void @ext(i32* %x)
+  ret void
+}
+
+define void @foo(i32* %x) {
+; CHECK-LABEL: define void @foo(
+; CHECK: llvm.lifetime.start
+; CHECK: store i32 %2, i32* %x
+  call void @bar(i32* byval %x)
+  ret void
+}
+
+define internal void @qux(i32* byval %x) {
+  call void @ext(i32* %x)
+  tail call void @ext(i32* null)
+  ret void
+}
+
+define void @frob(i32* %x) {
+; CHECK-LABEL: define void @frob(
+; CHECK: %[[POS:.*]] = alloca i32
+; CHECK: %[[VAL:.*]] = load i32, i32* %x
+; CHECK: store i32 %[[VAL]], i32* %[[POS]]
+; CHECK: {{^ *}}call void @ext(i32* nonnull %[[POS]]
+; CHECK: tail call void @ext(i32* null)
+; CHECK: ret void
+  tail call void @qux(i32* byval %x)
+  ret void
+}
+
+; A byval parameter passed into a function which is passed out as byval does
+; not block the call from being marked as tail.
+
+declare void @ext2(i32* byval)
+
+define void @bar2(i32* byval %x) {
+  call void @ext2(i32* byval %x)
+  ret void
+}
+
+define void @foobar(i32* %x) {
+; CHECK-LABEL: define void @foobar(
+; CHECK: %[[POS:.*]] = alloca i32
+; CHECK: %[[VAL:.*]] = load i32, i32* %x
+; CHECK: store i32 %[[VAL]], i32* %[[POS]]
+; CHECK: tail call void @ext2(i32* byval nonnull %[[POS]]
+; CHECK: ret void
+  tail call void @bar2(i32* byval %x)
+  ret void
+}
+
+define void @barfoo() {
+; CHECK-LABEL: define void @barfoo(
+; CHECK: %[[POS:.*]] = alloca i32
+; CHECK: %[[VAL:.*]] = load i32, i32* %x
+; CHECK: store i32 %[[VAL]], i32* %[[POS]]
+; CHECK: tail call void @ext2(i32* byval nonnull %[[POS]]
+; CHECK: ret void
+  %x = alloca i32
+  tail call void @bar2(i32* byval %x)
+  ret void
+}