Target/X86: Add explicit Win64 and System V/x86-64 calling conventions.

Summary:
This patch adds explicit calling convention types for the Win64 and
System V/x86-64 ABIs. This allows code to override the default, and use
the Win64 convention on a target that wants to use SysV (and
vice-versa). This is needed to implement the `ms_abi` and `sysv_abi` GNU
attributes.

Reviewers:

CC:

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186144 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 38 insertions, 0 deletions

diff --git a/test/CodeGen/X86/win64_params.ll b/test/CodeGen/X86/win64_params.ll
index f9d4bf9..9718c86 100644
--- a/test/CodeGen/X86/win64_params.ll
+++ b/test/CodeGen/X86/win64_params.ll
@@ -1,4 +1,5 @@
 ; RUN: llc < %s -mtriple=x86_64-pc-win32 | FileCheck %s
+; RUN: llc < %s -mtriple=x86_64-pc-linux | FileCheck %s -check-prefix=LINUX
 
 ; Verify that the 5th and 6th parameters are coming from the correct location
 ; on the stack.
@@ -6,6 +7,30 @@ define i32 @f6(i32 %p1, i32 %p2, i32 %p3, i32 %p4, i32 %p5, i32 %p6) nounwind re
 entry:
 ; CHECK: movl    48(%rsp), %eax
 ; CHECK: addl    40(%rsp), %eax
+; LINUX: addl    %r9d, %r8d
+; LINUX: movl    %r8d, %eax
+  %add = add nsw i32 %p6, %p5
+  ret i32 %add
+}
+
+define x86_64_win64cc i32 @f7(i32 %p1, i32 %p2, i32 %p3, i32 %p4, i32 %p5, i32 %p6) nounwind readnone optsize {
+entry:
+; CHECK: movl    48(%rsp), %eax
+; CHECK: addl    40(%rsp), %eax
+; LINUX: movl    48(%rsp), %eax
+; LINUX: addl    40(%rsp), %eax
+  %add = add nsw i32 %p6, %p5
+  ret i32 %add
+}
+
+; Verify that even though we're compiling for Windows, parameters behave as
+; on other platforms here (note the x86_64_sysvcc calling convention).
+define x86_64_sysvcc i32 @f8(i32 %p1, i32 %p2, i32 %p3, i32 %p4, i32 %p5, i32 %p6) nounwind readnone optsize {
+entry:
+; CHECK: addl    %r9d, %r8d
+; CHECK: movl    %r8d, %eax
+; LINUX: addl    %r9d, %r8d
+; LINUX: movl    %r8d, %eax
   %add = add nsw i32 %p6, %p5
   ret i32 %add
 }
diff --git a/test/CodeGen/X86/win_chkstk.ll b/test/CodeGen/X86/win_chkstk.ll
index e4e4483..3f522ea 100644
--- a/test/CodeGen/X86/win_chkstk.ll
+++ b/test/CodeGen/X86/win_chkstk.ll
@@ -45,3 +45,16 @@ entry:
   %array128 = alloca [128 x i8], align 16         ; <[128 x i8]*> [#uses=0]
   ret i32 0
 }
+
+; Make sure we don't call __chkstk or __alloca on non-Windows even if the
+; caller has the Win64 calling convention.
+define x86_64_win64cc i32 @main4k_win64() nounwind {
+entry:
+; WIN_X32:    calll __chkstk
+; WIN_X64:    callq __chkstk
+; MINGW_X32:  calll __alloca
+; MINGW_X64:  callq ___chkstk
+; LINUX-NOT:  call __chkstk
+  %array4096 = alloca [4096 x i8], align 16       ; <[4096 x i8]*> [#uses=0]
+  ret i32 0
+}