add new CC_X86_32_FastCall calling conv, which describes fastcall on win32.

Factor out a CC_X86_32_Common convention, which is the part shared between
ccc, stdcall and fastcall

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34732 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/X86/X86CallingConv.td b/lib/Target/X86/X86CallingConv.td
index 04a79043fdf19cca27e8bb10fa1d33a3580f0ee2..f96b040461a8ef66f9a49e2b24d3390df3bb5409 100644 (file)
--- a/lib/Target/X86/X86CallingConv.td
+++ b/lib/Target/X86/X86CallingConv.td
@@ -111,22 +111,18 @@ def CC_X86_64_C : CallingConv<[
 // X86 C Calling Convention
 //===----------------------------------------------------------------------===//
 
-def CC_X86_32_C : CallingConv<[
-  // Promote i8/i16 arguments to i32.
-  CCIfType<[i8, i16], CCPromoteToType<i32>>,
-  
-  // The first 3 integer arguments, if marked 'inreg', are passed in integer
-  // registers.
-  CCIfInReg<CCIfType<[i32], CCAssignToReg<[EAX, EDX, ECX]>>>,
-  
-  // Other Integer/Float values get stored in stack slots that are 4 bytes in
+/// CC_X86_32_Common - In all X86-32 calling conventions, extra integers and FP
+/// values are spilled on the stack, and the first 4 vector values go in XMM
+/// regs.
+def CC_X86_32_Common : CallingConv<[
+  // Integer/Float values get stored in stack slots that are 4 bytes in
   // size and 4-byte aligned.
   CCIfType<[i32, f32], CCAssignToStack<4, 4>>,
   
   // Doubles get 8-byte slots that are 4-byte aligned.
   CCIfType<[f64], CCAssignToStack<8, 4>>,
   
-  // The first 4 Vector arguments are passed in XMM registers.
+  // The first 4 vector arguments are passed in XMM registers.
   CCIfType<[v16i8, v8i16, v4i32, v2i64, v4f32, v2f64],
               CCAssignToReg<[XMM0, XMM1, XMM2, XMM3]>>,
 
@@ -134,5 +130,28 @@ def CC_X86_32_C : CallingConv<[
   CCIfType<[v16i8, v8i16, v4i32, v2i64, v4f32, v2f64], CCAssignToStack<16, 16>>
 ]>;
 
+def CC_X86_32_C : CallingConv<[
+  // Promote i8/i16 arguments to i32.
+  CCIfType<[i8, i16], CCPromoteToType<i32>>,
+  
+  // The first 3 integer arguments, if marked 'inreg', are passed in integer
+  // registers.
+  CCIfInReg<CCIfType<[i32], CCAssignToReg<[EAX, EDX, ECX]>>>,
+  
+  // Otherwise, same as everything else.
+  CCDelegateTo<CC_X86_32_Common>
+]>;
+
+
+def CC_X86_32_FastCall : CallingConv<[
+  // Promote i8/i16 arguments to i32.
+  CCIfType<[i8, i16], CCPromoteToType<i32>>,
+  
+  // The first 2 integer arguments are passed in ECX/EDX
+  CCIfInReg<CCIfType<[i32], CCAssignToReg<[ECX, EDX]>>>,
+  
+  // Otherwise, same as everything else.
+  CCDelegateTo<CC_X86_32_Common>
+]>;