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author | Stephen Lin <stephenwlin@gmail.com> | 2013-04-20 05:14:40 +0000 |
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committer | Stephen Lin <stephenwlin@gmail.com> | 2013-04-20 05:14:40 +0000 |
commit | 456ca048af35163b9f52187e92a23ee0a9f059e8 (patch) | |
tree | f7b4d4711424b927d5b323a9e4ef4d97742beeb4 /test/CodeGen | |
parent | 5c34e08b9fff9d4df2421e4f41ff15b85f638dd1 (diff) | |
download | llvm-456ca048af35163b9f52187e92a23ee0a9f059e8.tar.gz llvm-456ca048af35163b9f52187e92a23ee0a9f059e8.tar.bz2 llvm-456ca048af35163b9f52187e92a23ee0a9f059e8.tar.xz |
Add CodeGen support for functions that always return arguments via a new parameter attribute 'returned', which is taken advantage of in target-independent tail call opportunity detection and in ARM call lowering (when placed on an integral first parameter).
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@179925 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/CodeGen')
-rw-r--r-- | test/CodeGen/ARM/this-return.ll | 91 | ||||
-rw-r--r-- | test/CodeGen/X86/this-return-64.ll | 89 |
2 files changed, 180 insertions, 0 deletions
diff --git a/test/CodeGen/ARM/this-return.ll b/test/CodeGen/ARM/this-return.ll new file mode 100644 index 0000000000..0266153b94 --- /dev/null +++ b/test/CodeGen/ARM/this-return.ll @@ -0,0 +1,91 @@ +; RUN: llc < %s -mtriple=armv6-linux-gnueabi -arm-tail-calls | FileCheck %s -check-prefix=CHECKELF +; RUN: llc < %s -mtriple=thumbv7-apple-ios -arm-tail-calls | FileCheck %s -check-prefix=CHECKT2D + +%struct.A = type { i8 } +%struct.B = type { i32 } +%struct.C = type { %struct.B } +%struct.D = type { %struct.B } + +declare %struct.A* @A_ctor_base(%struct.A* returned) +declare %struct.B* @B_ctor_base(%struct.B* returned, i32) +declare %struct.B* @B_ctor_complete(%struct.B* returned, i32) + +declare %struct.A* @A_ctor_base_nothisret(%struct.A*) +declare %struct.B* @B_ctor_base_nothisret(%struct.B*, i32) +declare %struct.B* @B_ctor_complete_nothisret(%struct.B*, i32) + +define %struct.C* @C_ctor_base(%struct.C* returned %this, i32 %x) { +entry: +; CHECKELF: C_ctor_base: +; CHECKELF-NOT: mov {{r[0-9]+}}, r0 +; CHECKELF: bl A_ctor_base +; CHECKELF-NOT: mov r0, {{r[0-9]+}} +; CHECKELF: b B_ctor_base +; CHECKT2D: C_ctor_base: +; CHECKT2D-NOT: mov {{r[0-9]+}}, r0 +; CHECKT2D: blx _A_ctor_base +; CHECKT2D-NOT: mov r0, {{r[0-9]+}} +; CHECKT2D: b.w _B_ctor_base + %0 = bitcast %struct.C* %this to %struct.A* + %call = tail call %struct.A* @A_ctor_base(%struct.A* %0) + %1 = getelementptr inbounds %struct.C* %this, i32 0, i32 0 + %call2 = tail call %struct.B* @B_ctor_base(%struct.B* %1, i32 %x) + ret %struct.C* %this +} + +define %struct.C* @C_ctor_base_nothisret(%struct.C* %this, i32 %x) { +entry: +; CHECKELF: C_ctor_base_nothisret: +; CHECKELF: mov [[SAVETHIS:r[0-9]+]], r0 +; CHECKELF: bl A_ctor_base_nothisret +; CHECKELF: mov r0, [[SAVETHIS]] +; CHECKELF-NOT: b B_ctor_base_nothisret +; CHECKT2D: C_ctor_base_nothisret: +; CHECKT2D: mov [[SAVETHIS:r[0-9]+]], r0 +; CHECKT2D: blx _A_ctor_base_nothisret +; CHECKT2D: mov r0, [[SAVETHIS]] +; CHECKT2D-NOT: b.w _B_ctor_base_nothisret + %0 = bitcast %struct.C* %this to %struct.A* + %call = tail call %struct.A* @A_ctor_base_nothisret(%struct.A* %0) + %1 = getelementptr inbounds %struct.C* %this, i32 0, i32 0 + %call2 = tail call %struct.B* @B_ctor_base_nothisret(%struct.B* %1, i32 %x) + ret %struct.C* %this +} + +define %struct.C* @C_ctor_complete(%struct.C* %this, i32 %x) { +entry: +; CHECKELF: C_ctor_complete: +; CHECKELF: b C_ctor_base +; CHECKT2D: C_ctor_complete: +; CHECKT2D: b.w _C_ctor_base + %call = tail call %struct.C* @C_ctor_base(%struct.C* %this, i32 %x) + ret %struct.C* %this +} + +define %struct.C* @C_ctor_complete_nothisret(%struct.C* %this, i32 %x) { +entry: +; CHECKELF: C_ctor_complete_nothisret: +; CHECKELF-NOT: b C_ctor_base_nothisret +; CHECKT2D: C_ctor_complete_nothisret: +; CHECKT2D-NOT: b.w _C_ctor_base_nothisret + %call = tail call %struct.C* @C_ctor_base_nothisret(%struct.C* %this, i32 %x) + ret %struct.C* %this +} + +define %struct.D* @D_ctor_base(%struct.D* %this, i32 %x) { +entry: +; CHECKELF: D_ctor_base: +; CHECKELF-NOT: mov {{r[0-9]+}}, r0 +; CHECKELF: bl B_ctor_complete +; CHECKELF-NOT: mov r0, {{r[0-9]+}} +; CHECKELF: b B_ctor_complete +; CHECKT2D: D_ctor_base: +; CHECKT2D-NOT: mov {{r[0-9]+}}, r0 +; CHECKT2D: blx _B_ctor_complete +; CHECKT2D-NOT: mov r0, {{r[0-9]+}} +; CHECKT2D: b.w _B_ctor_complete + %b = getelementptr inbounds %struct.D* %this, i32 0, i32 0 + %call = tail call %struct.B* @B_ctor_complete(%struct.B* %b, i32 %x) + %call2 = tail call %struct.B* @B_ctor_complete(%struct.B* %b, i32 %x) + ret %struct.D* %this +} diff --git a/test/CodeGen/X86/this-return-64.ll b/test/CodeGen/X86/this-return-64.ll new file mode 100644 index 0000000000..2b26a89e3c --- /dev/null +++ b/test/CodeGen/X86/this-return-64.ll @@ -0,0 +1,89 @@ +; RUN: llc < %s -mtriple=x86_64-pc-win32 | FileCheck %s + +%struct.A = type { i8 } +%struct.B = type { i32 } +%struct.C = type { %struct.B } +%struct.D = type { %struct.B } +%struct.E = type { %struct.B } + +declare %struct.A* @A_ctor(%struct.A* returned) +declare %struct.B* @B_ctor(%struct.B* returned, i32) + +declare %struct.A* @A_ctor_nothisret(%struct.A*) +declare %struct.B* @B_ctor_nothisret(%struct.B*, i32) + +define %struct.C* @C_ctor(%struct.C* %this, i32 %y) { +entry: +; CHECK: C_ctor: +; CHECK: jmp B_ctor # TAILCALL + %0 = getelementptr inbounds %struct.C* %this, i64 0, i32 0 + %call = tail call %struct.B* @B_ctor(%struct.B* %0, i32 %y) + ret %struct.C* %this +} + +define %struct.C* @C_ctor_nothisret(%struct.C* %this, i32 %y) { +entry: +; CHECK: C_ctor_nothisret: +; CHECK-NOT: jmp B_ctor_nothisret + %0 = getelementptr inbounds %struct.C* %this, i64 0, i32 0 + %call = tail call %struct.B* @B_ctor_nothisret(%struct.B* %0, i32 %y) + ret %struct.C* %this +} + +define %struct.D* @D_ctor(%struct.D* %this, i32 %y) { +entry: +; CHECK: D_ctor: +; CHECK: movq %rcx, [[SAVETHIS:%r[0-9a-z]+]] +; CHECK: callq A_ctor +; CHECK: movq [[SAVETHIS]], %rcx +; CHECK: jmp B_ctor # TAILCALL + %0 = bitcast %struct.D* %this to %struct.A* + %call = tail call %struct.A* @A_ctor(%struct.A* %0) + %1 = getelementptr inbounds %struct.D* %this, i64 0, i32 0 + %call2 = tail call %struct.B* @B_ctor(%struct.B* %1, i32 %y) +; (this next line would never be generated by Clang, actually) + %2 = bitcast %struct.A* %call to %struct.D* + ret %struct.D* %2 +} + +define %struct.D* @D_ctor_nothisret(%struct.D* %this, i32 %y) { +entry: +; CHECK: D_ctor_nothisret: +; CHECK: movq %rcx, [[SAVETHIS:%r[0-9a-z]+]] +; CHECK: callq A_ctor_nothisret +; CHECK: movq [[SAVETHIS]], %rcx +; CHECK-NOT: jmp B_ctor_nothisret + %0 = bitcast %struct.D* %this to %struct.A* + %call = tail call %struct.A* @A_ctor_nothisret(%struct.A* %0) + %1 = getelementptr inbounds %struct.D* %this, i64 0, i32 0 + %call2 = tail call %struct.B* @B_ctor_nothisret(%struct.B* %1, i32 %y) +; (this next line would never be generated by Clang, actually) + %2 = bitcast %struct.A* %call to %struct.D* + ret %struct.D* %2 +} + +define %struct.E* @E_ctor(%struct.E* %this, i32 %x) { +entry: +; CHECK: E_ctor: +; CHECK: movq %rcx, [[SAVETHIS:%r[0-9a-z]+]] +; CHECK: callq B_ctor +; CHECK: movq [[SAVETHIS]], %rcx +; CHECK: jmp B_ctor # TAILCALL + %b = getelementptr inbounds %struct.E* %this, i64 0, i32 0 + %call = tail call %struct.B* @B_ctor(%struct.B* %b, i32 %x) + %call4 = tail call %struct.B* @B_ctor(%struct.B* %b, i32 %x) + ret %struct.E* %this +} + +define %struct.E* @E_ctor_nothisret(%struct.E* %this, i32 %x) { +entry: +; CHECK: E_ctor_nothisret: +; CHECK: movq %rcx, [[SAVETHIS:%r[0-9a-z]+]] +; CHECK: callq B_ctor_nothisret +; CHECK: movq [[SAVETHIS]], %rcx +; CHECK-NOT: jmp B_ctor_nothisret + %b = getelementptr inbounds %struct.E* %this, i64 0, i32 0 + %call = tail call %struct.B* @B_ctor_nothisret(%struct.B* %b, i32 %x) + %call4 = tail call %struct.B* @B_ctor_nothisret(%struct.B* %b, i32 %x) + ret %struct.E* %this +} |