Teach SDISel to combine fsin / fcos into a fsincos node if the following

conditions are met:
1. They share the same operand and are in the same BB.
2. Both outputs are used.
3. The target has a native instruction that maps to ISD::FSINCOS node or
   the target provides a sincos library call.

Implemented the generic optimization in sdisel and enabled it for
Mac OSX. Also added an additional optimization for x86_64 Mac OSX by
using an alternative entry point __sincos_stret which returns the two
results in xmm0 / xmm1.

rdar://13087969
PR13204

llvm-svn: 173755

1 files changed, 7 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/TargetLoweringBase.cpp b/llvm/lib/CodeGen/TargetLoweringBase.cpp
index 6284d520f5c..10aa9d684ba 100644
--- a/llvm/lib/CodeGen/TargetLoweringBase.cpp
+++ b/llvm/lib/CodeGen/TargetLoweringBase.cpp
@@ -340,6 +340,13 @@ static void InitLibcallNames(const char **Names) {
   Names[RTLIB::SYNC_FETCH_AND_NAND_2] = "__sync_fetch_and_nand_2";
   Names[RTLIB::SYNC_FETCH_AND_NAND_4] = "__sync_fetch_and_nand_4";
   Names[RTLIB::SYNC_FETCH_AND_NAND_8] = "__sync_fetch_and_nand_8";
+  
+  // These are generally not available.
+  Names[RTLIB::SINCOS_F32] = 0;
+  Names[RTLIB::SINCOS_F64] = 0;
+  Names[RTLIB::SINCOS_F80] = 0;
+  Names[RTLIB::SINCOS_F128] = 0;
+  Names[RTLIB::SINCOS_PPCF128] = 0;
 }
 
 /// InitLibcallCallingConvs - Set default libcall CallingConvs.