1 files changed, 87 insertions, 0 deletions
diff --git a/test/Transforms/InstCombine/2011-09-03-Trampoline.ll b/test/Transforms/InstCombine/2011-09-03-Trampoline.ll
new file mode 100644
index 00000000000..5456e035739
--- /dev/null
+++ b/test/Transforms/InstCombine/2011-09-03-Trampoline.ll
@@ -0,0 +1,87 @@
+; RUN: opt -instcombine -S < %s | FileCheck %s
+
+declare void @llvm.init.trampoline(i8*, i8*, i8*)
+declare i8* @llvm.adjust.trampoline(i8*)
+declare i32 @f(i8 * nest, i32)
+
+; Most common case
+define i32 @test0(i32 %n) {
+  %alloca = alloca [10 x i8], align 16
+  %gep = getelementptr [10 x i8]* %alloca, i32 0, i32 0
+  call void @llvm.init.trampoline(i8* %gep, i8* bitcast (i32 (i8*, i32)* @f to i8*),
+                                  i8* null)
+  %tramp = call i8* @llvm.adjust.trampoline(i8* %gep)
+  %function = bitcast i8* %tramp to i32(i32)*
+  %ret = call i32 %function(i32 %n)
+  ret i32 %ret
+
+; CHECK: define i32 @test0(i32 %n) {
+; CHECK: %ret = call i32 @f(i8* nest null, i32 %n)
+}
+
+define i32 @test1(i32 %n, i8* %trampmem) {
+  call void @llvm.init.trampoline(i8* %trampmem,
+                                  i8* bitcast (i32 (i8*, i32)* @f to i8*),
+                                  i8* null)
+  %tramp = call i8* @llvm.adjust.trampoline(i8* %trampmem)
+  %function = bitcast i8* %tramp to i32(i32)*
+  %ret = call i32 %function(i32 %n)
+  ret i32 %ret
+; CHECK: define i32 @test1(i32 %n, i8* %trampmem) {
+; CHECK: %ret = call i32 @f(i8* nest null, i32 %n)
+}
+
+define i32 @test2(i32 %n, i8* %trampmem) {
+  %tramp = call i8* @llvm.adjust.trampoline(i8* %trampmem)
+  %functiona = bitcast i8* %tramp to i32(i32)*
+  %ret = call i32 %functiona(i32 %n)
+  ret i32 %ret
+; CHECK: define i32 @test2(i32 %n, i8* %trampmem) {
+; CHECK: %ret = call i32 %functiona(i32 %n)
+}
+
+define i32 @test3(i32 %n, i8* %trampmem) {
+  call void @llvm.init.trampoline(i8* %trampmem,
+                                  i8* bitcast (i32 (i8*, i32)* @f to i8*),
+                                  i8* null)
+
+; CHECK: define i32 @test3(i32 %n, i8* %trampmem) {
+; CHECK: %ret0 = call i32 @f(i8* nest null, i32 %n)
+  %tramp0 = call i8* @llvm.adjust.trampoline(i8* %trampmem)
+  %function0 = bitcast i8* %tramp0 to i32(i32)*
+  %ret0 = call i32 %function0(i32 %n)
+
+  ;; Not optimized since previous call could be writing.
+  %tramp1 = call i8* @llvm.adjust.trampoline(i8* %trampmem)
+  %function1 = bitcast i8* %tramp1 to i32(i32)*
+  %ret1 = call i32 %function1(i32 %n)
+; CHECK: %ret1 = call i32 %function1(i32 %n)
+
+  ret i32 %ret1
+}
+
+define i32 @test4(i32 %n) {
+  %alloca = alloca [10 x i8], align 16
+  %gep = getelementptr [10 x i8]* %alloca, i32 0, i32 0
+  call void @llvm.init.trampoline(i8* %gep, i8* bitcast (i32 (i8*, i32)* @f to i8*),
+                                  i8* null)
+
+  %tramp0 = call i8* @llvm.adjust.trampoline(i8* %gep)
+  %function0 = bitcast i8* %tramp0 to i32(i32)*
+  %ret0 = call i32 %function0(i32 %n)
+
+  %tramp1 = call i8* @llvm.adjust.trampoline(i8* %gep)
+  %function1 = bitcast i8* %tramp0 to i32(i32)*
+  %ret1 = call i32 %function1(i32 %n)
+
+  %tramp2 = call i8* @llvm.adjust.trampoline(i8* %gep)
+  %function2 = bitcast i8* %tramp2 to i32(i32)*
+  %ret2 = call i32 %function2(i32 %n)
+
+  ret i32 %ret2
+
+; CHECK: define i32 @test4(i32 %n) {
+; CHECK: %ret0 = call i32 @f(i8* nest null, i32 %n)
+; CHECK: %ret1 = call i32 @f(i8* nest null, i32 %n)
+; CHECK: %ret2 = call i32 @f(i8* nest null, i32 %n)
+}