Re-commit r221056 and others with fix, "[mips] Move F128 argument handling into MipsC...

[oota-llvm.git] / lib / Target / Mips / MipsCallingConv.td

diff --git a/lib/Target/Mips/MipsCallingConv.td b/lib/Target/Mips/MipsCallingConv.td
index a2130bb67a0befb5076e9c119c260360b013efe7..7e5c2a902f13f2462c3a375ddec7e8dfb6209fb7 100644 (file)
--- a/lib/Target/Mips/MipsCallingConv.td
+++ b/lib/Target/Mips/MipsCallingConv.td
@@ -279,13 +279,6 @@ def CC_Mips_FastCC : CallingConv<[
   CCDelegateTo<CC_MipsN_FastCC>
 ]>;
 
-//==
-
-def CC_Mips16RetHelper : CallingConv<[
-  // Integer arguments are passed in integer registers.
-  CCIfType<[i32], CCAssignToReg<[V0, V1, A0, A1]>>
-]>;
-
 //===----------------------------------------------------------------------===//
 // Mips Calling Convention Dispatch
 //===----------------------------------------------------------------------===//
@@ -297,7 +290,29 @@ def RetCC_Mips : CallingConv<[
   CCDelegateTo<RetCC_MipsO32>
 ]>;
 
+def CC_Mips_ByVal : CallingConv<[
+  CCIfSubtarget<"isABI_O32()", CCIfByVal<CCPassByVal<4, 4>>>,
+  CCIfByVal<CCPassByVal<8, 8>>
+]>;
+
 def CC_Mips_FixedArg : CallingConv<[
+  CCIfByVal<CCDelegateTo<CC_Mips_ByVal>>,
+
+  // f128 needs to be handled similarly to f32 and f64 on hard-float. However,
+  // f128 is not legal and is lowered to i128 which is further lowered to a pair
+  // of i64's.
+  // This presents us with a problem for the calling convention since hard-float
+  // still needs to pass them in FPU registers. We therefore resort to a
+  // pre-analyze (see PreAnalyzeFormalArgsForF128()) step to pass information on
+  // whether the argument was originally an f128 into the tablegen-erated code.
+  //
+  // f128 should only occur for the N64 ABI where long double is 128-bit. On
+  // N32, long double is equivalent to double.
+  CCIfType<[i64],
+      CCIfSubtargetNot<"abiUsesSoftFloat()",
+          CCIf<"static_cast<MipsCCState *>(&State)->WasOriginalArgF128(ValNo)",
+              CCBitConvertToType<f64>>>>,
+
   CCIfCC<"CallingConv::Fast", CCDelegateTo<CC_Mips_FastCC>>,
 
   // FIXME: There wasn't an EABI case in the original code and it seems unlikely
@@ -307,12 +322,23 @@ def CC_Mips_FixedArg : CallingConv<[
 ]>;
 
 def CC_Mips_VarArg : CallingConv<[
+  CCIfByVal<CCDelegateTo<CC_Mips_ByVal>>,
+
   // FIXME: There wasn't an EABI case in the original code and it seems unlikely
   //        that it's the same as CC_MipsN_VarArg
   CCIfSubtarget<"isABI_O32()", CCDelegateTo<CC_MipsO32_FP>>,
   CCDelegateTo<CC_MipsN_VarArg>
 ]>;
 
+//==
+
+def CC_Mips16RetHelper : CallingConv<[
+  CCIfByVal<CCDelegateTo<CC_Mips_ByVal>>,
+
+  // Integer arguments are passed in integer registers.
+  CCIfType<[i32], CCAssignToReg<[V0, V1, A0, A1]>>
+]>;
+
 //===----------------------------------------------------------------------===//
 // Callee-saved register lists.
 //===----------------------------------------------------------------------===//