The SPARCv9 ABI returns a float in %f0.

[oota-llvm.git] / lib / Target / Sparc / SparcCallingConv.td

diff --git a/lib/Target/Sparc/SparcCallingConv.td b/lib/Target/Sparc/SparcCallingConv.td
index a181bcf3d2636951a1a9e2fbd25113ad731145bd..dfaaabf344a3ad692d71967d7a1d5982bdea287d 100644 (file)
--- a/lib/Target/Sparc/SparcCallingConv.td
+++ b/lib/Target/Sparc/SparcCallingConv.td
@@ -103,7 +103,7 @@ def RetCC_Sparc32 : CallingConv<[
 // Function return values are passed exactly like function arguments, except a
 // struct up to 32 bytes in size can be returned in registers.
 
-// Function arguments AND return values.
+// Function arguments AND most return values.
 def CC_Sparc64 : CallingConv<[
   // The frontend uses the inreg flag to indicate i32 and float arguments from
   // structs. These arguments are not promoted to 64 bits, but they can still
@@ -117,3 +117,23 @@ def CC_Sparc64 : CallingConv<[
   // arguments whether they are passed in registers or not.
   CCCustom<"CC_Sparc64_Full">
 ]>;
+
+def RetCC_Sparc64 : CallingConv<[
+  // A single f32 return value always goes in %f0. The ABI doesn't specify what
+  // happens to multiple f32 return values outside a struct.
+  CCIfType<[f32], CCCustom<"CC_Sparc64_Half">>,
+
+  // Otherwise, return values are passed exactly like arguments.
+  CCDelegateTo<CC_Sparc64>
+]>;
+
+// Callee-saved registers are handled by the register window mechanism.
+def CSR : CalleeSavedRegs<(add)> {
+  let OtherPreserved = (add (sequence "I%u", 0, 7),
+                            (sequence "L%u", 0, 7));
+}
+
+// Callee-saved registers for calls with ReturnsTwice attribute.
+def RTCSR : CalleeSavedRegs<(add)> {
+  let OtherPreserved = (add I6, I7);
+}