Revert "Proper va_arg/va_copy lowering on win64"

This reverts commit 2b52880592a525cfe04d8f9008a35da8c2ea94c3.

Needs review.

llvm-svn: 185806

2 files changed, 1 insertions, 62 deletions

diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp
index a6e894b7cab..174cc4602d9 100644
--- a/llvm/lib/Target/X86/X86ISelLowering.cpp
+++ b/llvm/lib/Target/X86/X86ISelLowering.cpp
@@ -582,12 +582,10 @@ void X86TargetLowering::resetOperationActions() {
   // VASTART needs to be custom lowered to use the VarArgsFrameIndex
   setOperationAction(ISD::VASTART           , MVT::Other, Custom);
   setOperationAction(ISD::VAEND             , MVT::Other, Expand);
-  if (Subtarget->is64Bit() && !Subtarget->isTargetWin64()) {
-    // TargetInfo::X86_64ABIBuiltinVaList
+  if (Subtarget->is64Bit()) {
     setOperationAction(ISD::VAARG           , MVT::Other, Custom);
     setOperationAction(ISD::VACOPY          , MVT::Other, Custom);
   } else {
-    // TargetInfo::CharPtrBuiltinVaList
     setOperationAction(ISD::VAARG           , MVT::Other, Expand);
     setOperationAction(ISD::VACOPY          , MVT::Other, Expand);
   }
diff --git a/llvm/test/CodeGen/X86/win64_vararg.ll b/llvm/test/CodeGen/X86/win64_vararg.ll
index 07b7826c000..52bc50922c2 100644
--- a/llvm/test/CodeGen/X86/win64_vararg.ll
+++ b/llvm/test/CodeGen/X86/win64_vararg.ll
@@ -18,7 +18,6 @@ entry:
 }
 
 declare void @llvm.va_start(i8*) nounwind
-declare void @llvm.va_copy(i8*, i8*) nounwind
 
 ; CHECK: f5:
 ; CHECK: pushq
@@ -52,61 +51,3 @@ entry:
   call void @llvm.va_start(i8* %ap1)
   ret i8* %ap1
 }
-
-; WinX86_64 uses char* for va_list. Verify that the correct amount of bytes
-; are copied using va_copy.
-; CHECK: copy4:
-; CHECK: subq $16
-; CHECK: leaq 56(%rsp), [[REGISTER:%[a-z]+]]
-; CHECK: movq [[REGISTER]], 8(%rsp)
-; CHECK: movq [[REGISTER]], (%rsp)
-; CHECK: addq $16
-; CHECK: ret
-define void @copy4(i64 %a0, i64 %a1, i64 %a2, i64 %a3, ...) nounwind {
-entry:
-  %ap = alloca i8*, align 8
-  %cp = alloca i8*, align 8
-  %ap1 = bitcast i8** %ap to i8*
-  %cp1 = bitcast i8** %cp to i8*
-  call void @llvm.va_start(i8* %ap1)
-  call void @llvm.va_copy(i8* %cp1, i8* %ap1)
-  ret void
-}
-
-; CHECK: copy1:
-; CHECK: subq $16
-; CHECK: leaq 32(%rsp), [[REGISTER:%[a-z]+]]
-; CHECK: movq [[REGISTER]], 8(%rsp)
-; CHECK: movq [[REGISTER]], (%rsp)
-; CHECK: addq $16
-; CHECK: ret
-define void @copy1(i64 %a0, ...) nounwind {
-entry:
-  %ap = alloca i8*, align 8
-  %cp = alloca i8*, align 8
-  %ap1 = bitcast i8** %ap to i8*
-  %cp1 = bitcast i8** %cp to i8*
-  call void @llvm.va_start(i8* %ap1)
-  call void @llvm.va_copy(i8* %cp1, i8* %ap1)
-  ret void
-}
-
-; CHECK: arg4:
-; CHECK: pushq
-; va_start:
-; CHECK: leaq 48(%rsp), [[REG1:%[a-z]+]]
-; CHECK: movq [[REG1]], (%rsp)
-; va_arg:
-; CHECK: leaq 52(%rsp), [[REG2:%[a-z]+]]
-; CHECK: movq [[REG2]], (%rsp)
-; CHECK: movl 48(%rsp), %eax
-; CHECK: popq
-; CHECK: ret
-define i32 @arg4(i64 %a0, i64 %a1, i64 %a2, i64 %a3, ...) nounwind {
-entry:
-  %ap = alloca i8*, align 8
-  %ap1 = bitcast i8** %ap to i8*
-  call void @llvm.va_start(i8* %ap1)
-  %tmp = va_arg i8** %ap, i32
-  ret i32 %tmp
-}