remove SetRoundMode

we only care about SSE rounding mode, and set
that manually in SetSIMDMode

Source/Core/Common/ArmFPURoundMode.cpp

@@ -35,11 +35,6 @@ namespace FPURoundMode
 static const u64 default_fpcr = GetFPCR();
 static u64 saved_fpcr = default_fpcr;
 
-void SetRoundMode(RoundMode mode)
-{
-  // We don't need to do anything here since SetSIMDMode is always called after calling this
-}
-
 void SetSIMDMode(RoundMode rounding_mode, bool non_ieee_mode)
 {
   // When AH is disabled, FZ controls flush-to-zero for both inputs and outputs. When AH is enabled,

Source/Core/Common/FPURoundMode.h

@@ -15,8 +15,6 @@ enum RoundMode : u32
   ROUND_DOWN = 3
 };
 
-void SetRoundMode(RoundMode mode);
-
 void SetSIMDMode(RoundMode rounding_mode, bool non_ieee_mode);
 
 /*

Source/Core/Common/GenericFPURoundMode.cpp

@@ -7,9 +7,6 @@
 // Generic, do nothing
 namespace FPURoundMode
 {
-void SetRoundMode(RoundMode mode)
-{
-}
 void SetSIMDMode(RoundMode rounding_mode, bool non_ieee_mode)
 {
 }

Source/Core/Common/x64FPURoundMode.cpp

@@ -14,13 +14,6 @@ namespace FPURoundMode
 static u32 saved_sse_state = _mm_getcsr();
 static const u32 default_sse_state = _mm_getcsr();
 
-void SetRoundMode(RoundMode mode)
-{
-  // Convert PowerPC to native rounding mode.
-  static const int rounding_mode_lut[] = {FE_TONEAREST, FE_TOWARDZERO, FE_UPWARD, FE_DOWNWARD};
-  fesetround(rounding_mode_lut[mode]);
-}
-
 void SetSIMDMode(RoundMode rounding_mode, bool non_ieee_mode)
 {
   // OR-mask for disabling FPU exceptions (bits 7-12 in the MXCSR register)

Source/Core/Core/PowerPC/PowerPC.cpp

@@ -640,7 +640,6 @@ void RoundingModeUpdated()
   // The rounding mode is separate for each thread, so this must run on the CPU thread
   ASSERT(Core::IsCPUThread());
 
-  FPURoundMode::SetRoundMode(FPSCR.RN);
   FPURoundMode::SetSIMDMode(FPSCR.RN, FPSCR.NI);
 }