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

2 files changed, 8 insertions, 0 deletions

diff --git a/llvm/include/llvm/CodeGen/ISDOpcodes.h b/llvm/include/llvm/CodeGen/ISDOpcodes.h
index 5d0a3b4c706..092fa5a2c05 100644
--- a/llvm/include/llvm/CodeGen/ISDOpcodes.h
+++ b/llvm/include/llvm/CodeGen/ISDOpcodes.h
@@ -455,6 +455,9 @@ namespace ISD {
     FNEG, FABS, FSQRT, FSIN, FCOS, FPOWI, FPOW,
     FLOG, FLOG2, FLOG10, FEXP, FEXP2,
     FCEIL, FTRUNC, FRINT, FNEARBYINT, FFLOOR,
+    
+    /// FSINCOS - Compute both fsin and fcos as a single operation.
+    FSINCOS,
 
     /// LOAD and STORE have token chains as their first operand, then the same
     /// operands as an LLVM load/store instruction, then an offset node that
diff --git a/llvm/include/llvm/CodeGen/RuntimeLibcalls.h b/llvm/include/llvm/CodeGen/RuntimeLibcalls.h
index 1a9dc1cce39..41289a42c43 100644
--- a/llvm/include/llvm/CodeGen/RuntimeLibcalls.h
+++ b/llvm/include/llvm/CodeGen/RuntimeLibcalls.h
@@ -158,6 +158,11 @@ namespace RTLIB {
     COS_F80,
     COS_F128,
     COS_PPCF128,
+    SINCOS_F32,
+    SINCOS_F64,
+    SINCOS_F80,
+    SINCOS_F128,
+    SINCOS_PPCF128,
     POW_F32,
     POW_F64,
     POW_F80,