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, 86 insertions, 0 deletions

diff --git a/llvm/test/Transforms/CodeGenPrepare/basic.ll b/llvm/test/Transforms/CodeGenPrepare/basic.ll
new file mode 100644
index 00000000000..1a58d61b6e9
--- /dev/null
+++ b/llvm/test/Transforms/CodeGenPrepare/basic.ll
@@ -0,0 +1,86 @@
+; RUN: opt -codegenprepare -S < %s | FileCheck %s
+
+target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
+target triple = "x86_64-apple-darwin10.0.0"
+
+; CHECK-LABEL: @test1(
+; objectsize should fold to a constant, which causes the branch to fold to an
+; uncond branch. Next, we fold the control flow alltogether.
+; rdar://8785296
+define i32 @test1(i8* %ptr) nounwind ssp noredzone align 2 {
+entry:
+  %0 = tail call i64 @llvm.objectsize.i64(i8* %ptr, i1 false, i1 false, i1 false)
+  %1 = icmp ugt i64 %0, 3
+  br i1 %1, label %T, label %trap
+
+; CHECK: entry:
+; CHECK-NOT: br label %
+
+trap:                                             ; preds = %0, %entry
+  tail call void @llvm.trap() noreturn nounwind
+  unreachable
+
+T:
+; CHECK: ret i32 4
+  ret i32 4
+}
+
+; CHECK-LABEL: @test_objectsize_null_flag(
+define i64 @test_objectsize_null_flag(i8* %ptr) {
+entry:
+  ; CHECK: ret i64 -1
+  %0 = tail call i64 @llvm.objectsize.i64(i8* null, i1 false, i1 true, i1 false)
+  ret i64 %0
+}
+
+; CHECK-LABEL: @test_objectsize_null_flag_min(
+define i64 @test_objectsize_null_flag_min(i8* %ptr) {
+entry:
+  ; CHECK: ret i64 0
+  %0 = tail call i64 @llvm.objectsize.i64(i8* null, i1 true, i1 true, i1 false)
+  ret i64 %0
+}
+
+; Test foldable null pointers because we evaluate them with non-exact modes in
+; CodeGenPrepare.
+; CHECK-LABEL: @test_objectsize_null_flag_noas0(
+define i64 @test_objectsize_null_flag_noas0() {
+entry:
+  ; CHECK: ret i64 -1
+  %0 = tail call i64 @llvm.objectsize.i64.p1i8(i8 addrspace(1)* null, i1 false,
+                                               i1 true, i1 false)
+  ret i64 %0
+}
+
+; CHECK-LABEL: @test_objectsize_null_flag_min_noas0(
+define i64 @test_objectsize_null_flag_min_noas0() {
+entry:
+  ; CHECK: ret i64 0
+  %0 = tail call i64 @llvm.objectsize.i64.p1i8(i8 addrspace(1)* null, i1 true,
+                                               i1 true, i1 false)
+  ret i64 %0
+}
+
+; CHECK-LABEL: @test_objectsize_null_known_flag_noas0
+define i64 @test_objectsize_null_known_flag_noas0() {
+entry:
+  ; CHECK: ret i64 -1
+  %0 = tail call i64 @llvm.objectsize.i64.p1i8(i8 addrspace(1)* null, i1 false,
+                                               i1 false, i1 false)
+  ret i64 %0
+}
+
+; CHECK-LABEL: @test_objectsize_null_known_flag_min_noas0
+define i64 @test_objectsize_null_known_flag_min_noas0() {
+entry:
+  ; CHECK: ret i64 0
+  %0 = tail call i64 @llvm.objectsize.i64.p1i8(i8 addrspace(1)* null, i1 true,
+                                               i1 false, i1 false)
+  ret i64 %0
+}
+
+
+declare i64 @llvm.objectsize.i64(i8*, i1, i1, i1) nounwind readonly
+declare i64 @llvm.objectsize.i64.p1i8(i8 addrspace(1)*, i1, i1, i1) nounwind readonly
+
+declare void @llvm.trap() nounwind