R600: improve inputs/interpolation handling

Use one intrinsic for all sorts of interpolation.
Use two separate unexpanded instructions to represent INTERP_XY and _ZW -
this will allow to eliminate one part if it's not used.
Track liveness of special interpolation regs instead of reserving them -
this will allow to reuse those regs, lowering reg pressure.

Patch By: Vadim Girlin

v2[Vincent Lejeune]: Rebased against current llvm master

Signed-off-by: Vadim Girlin <vadimgirlin@gmail.com>
Reviewed-by: Tom Stellard <thomas.stellard@amd.com>
llvm-svn: 174394

1 files changed, 1 insertions, 16 deletions

diff --git a/llvm/lib/Target/R600/R600MachineFunctionInfo.cpp b/llvm/lib/Target/R600/R600MachineFunctionInfo.cpp
index bcb7f94..40aec83 100644
--- a/llvm/lib/Target/R600/R600MachineFunctionInfo.cpp
+++ b/llvm/lib/Target/R600/R600MachineFunctionInfo.cpp
@@ -13,21 +13,6 @@
 using namespace llvm;
 
 R600MachineFunctionInfo::R600MachineFunctionInfo(const MachineFunction &MF)
-  : MachineFunctionInfo(),
-    HasLinearInterpolation(false),
-    HasPerspectiveInterpolation(false) {
+  : MachineFunctionInfo() {
     memset(Outputs, 0, sizeof(Outputs));
   }
-
-unsigned R600MachineFunctionInfo::GetIJPerspectiveIndex() const {
-  assert(HasPerspectiveInterpolation);
-  return 0;
-}
-
-unsigned R600MachineFunctionInfo::GetIJLinearIndex() const {
-  assert(HasLinearInterpolation);
-  if (HasPerspectiveInterpolation)
-    return 1;
-  else
-    return 0;
-}