Change SPU C calling convention to match that described in

"SPU Application Binary Interface Specification, v1.9" by
IBM.
Specifically: use r3-r74 to pass parameters and the return value.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@111358 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/CellSPU/SPUCallingConv.td b/lib/Target/CellSPU/SPUCallingConv.td
index aedc0a5..dcd9a2e 100644 (file)
--- a/lib/Target/CellSPU/SPUCallingConv.td
+++ b/lib/Target/CellSPU/SPUCallingConv.td
@@ -19,16 +19,18 @@ class CCIfSubtarget<string F, CCAction A>
 // Return Value Calling Convention
 //===----------------------------------------------------------------------===//
 
-// Return-value convention for Cell SPU: Everything can be passed back via $3:
+// Return-value convention for Cell SPU: return value to be passed in reg 3-74
 def RetCC_SPU : CallingConv<[
-  CCIfType<[i8],       CCAssignToReg<[R3]>>,
-  CCIfType<[i16],      CCAssignToReg<[R3]>>,
-  CCIfType<[i32],      CCAssignToReg<[R3]>>,
-  CCIfType<[i64],      CCAssignToReg<[R3]>>,
-  CCIfType<[i128],     CCAssignToReg<[R3]>>,
-  CCIfType<[f32, f64], CCAssignToReg<[R3]>>,
-  CCIfType<[v16i8, v8i16, v4i32, v2i64, v4f32, v2f64], CCAssignToReg<[R3]>>,
-  CCIfType<[v2i32, v2f32],                             CCAssignToReg<[R3]>>
+  CCIfType<[i8,i16,i32,i64,i128,f32,f64,v16i8,v8i16,v4i32,v2i64,v4f32,v2f64, 
+            v2i32, v2f32],
+  CCAssignToReg<[R3,   R4,  R5,  R6,  R7,  R8,  R9, R10, R11,
+                 R12, R13, R14, R15, R16, R17, R18, R19, R20,
+                 R21, R22, R23, R24, R25, R26, R27, R28, R29,
+                 R30, R31, R32, R33, R34, R35, R36, R37, R38,
+                 R39, R40, R41, R42, R43, R44, R45, R46, R47,
+                 R48, R49, R50, R51, R52, R53, R54, R55, R56,
+                 R57, R58, R59, R60, R61, R62, R63, R64, R65,
+                 R66, R67, R68, R69, R70, R71, R72, R73, R74]>>
 ]>;
 
 
@@ -45,8 +47,7 @@ def CCC_SPU : CallingConv<[
                            R39, R40, R41, R42, R43, R44, R45, R46, R47,
                            R48, R49, R50, R51, R52, R53, R54, R55, R56,
                            R57, R58, R59, R60, R61, R62, R63, R64, R65,
-                           R66, R67, R68, R69, R70, R71, R72, R73, R74,
-                           R75, R76, R77, R78, R79]>>,
+                           R66, R67, R68, R69, R70, R71, R72, R73, R74]>>,
   // Integer/FP values get stored in stack slots that are 8 bytes in size and
   // 8-byte aligned if there are no more registers to hold them.
   CCIfType<[i32, i64, f32, f64], CCAssignToStack<8, 8>>,

diff --git a/test/CodeGen/CellSPU/arg_ret.ll b/test/CodeGen/CellSPU/arg_ret.ll
new file mode 100644 (file)
index 0000000..db8ff10
--- /dev/null
+++ b/test/CodeGen/CellSPU/arg_ret.ll
@@ -0,0 +1,33 @@
+; Test parameter passing and return values
+;RUN: llc --march=cellspu %s -o - | FileCheck %s
+
+; this fits into registers r3-r74
+%paramstruct = type { i32,i32,i32,i32,i32,i32,i32,i32,i32,i32,i32,i32,
+                      i32,i32,i32,i32,i32,i32,i32,i32,i32,i32,i32,i32,
+                      i32,i32,i32,i32,i32,i32,i32,i32,i32,i32,i32,i32,
+                      i32,i32,i32,i32,i32,i32,i32,i32,i32,i32,i32,i32,
+                      i32,i32,i32,i32,i32,i32,i32,i32,i32,i32,i32,i32,
+                      i32,i32,i32,i32,i32,i32,i32,i32,i32,i32,i32,i32}
+define ccc i32 @test_regs( %paramstruct %prm )
+{
+;CHECK:        lr      $3, $74
+;CHECK:        bi      $lr
+  %1 = extractvalue %paramstruct %prm, 71
+  ret i32 %1
+}
+
+define ccc i32 @test_regs_and_stack( %paramstruct %prm, i32 %stackprm )
+{
+;CHECK-NOT:    a       $3, $74, $75
+  %1 = extractvalue %paramstruct %prm, 71
+  %2 = add i32 %1, %stackprm
+  ret i32 %2
+}
+
+define ccc %paramstruct @test_return( i32 %param,  %paramstruct %prm )
+{
+;CHEKC:        lqd     $75, 80($sp)
+;CHECK:  lr    $3, $4
+  ret %paramstruct %prm
+}
+