[PATCH] R600/SI: implement range reduction for sin/cos

[Grigori Goronzy]

These instructions can only take a limited input range, and return
the constant value 1 out of range. We should do range reduction to
be able to process arbitrary values. Use a FRACT instruction after
normalization to achieve this.
---
 lib/Target/R600/SIInstructions.td | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/Target/R600/SIInstructions.td b/lib/Target/R600/SIInstructions.td
index f888b8e..2bdcfd2 100644
--- a/lib/Target/R600/SIInstructions.td
+++ b/lib/Target/R600/SIInstructions.td
@@ -2253,12 +2253,12 @@ def : Pat<
 
 def : Pat <
   (fcos f32:$src0),
-  (V_COS_F32_e32 (V_MUL_F32_e32 $src0, (V_MOV_B32_e32 CONST.TWO_PI_INV)))
+  (V_COS_F32_e32 (V_FRACT_F32_e32(V_MUL_F32_e32 $src0, (V_MOV_B32_e32 CONST.TWO_PI_INV))))
 >;
 
 def : Pat <
   (fsin f32:$src0),
-  (V_SIN_F32_e32 (V_MUL_F32_e32 $src0, (V_MOV_B32_e32 CONST.TWO_PI_INV)))
+  (V_SIN_F32_e32 (V_FRACT_F32_e32(V_MUL_F32_e32 $src0, (V_MOV_B32_e32 CONST.TWO_PI_INV))))
 >;
 
 def : Pat <
-- 
1.8.3.2