[PATCH v2 1/1] R600: Allow ftrunc

[Jan Vesely]

v2: Add ftrunc->TRUNC pattern instead of replacing int_AMDGPU_trunc

Signed-off-by: Jan Vesely <jan.vesely at rutgers.edu>
---
 lib/Target/R600/AMDGPUISelLowering.cpp | 2 ++
 lib/Target/R600/R600Instructions.td    | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/lib/Target/R600/AMDGPUISelLowering.cpp b/lib/Target/R600/AMDGPUISelLowering.cpp
index d7ee8e6..c59be7c 100644
--- a/lib/Target/R600/AMDGPUISelLowering.cpp
+++ b/lib/Target/R600/AMDGPUISelLowering.cpp
@@ -60,6 +60,7 @@ AMDGPUTargetLowering::AMDGPUTargetLowering(TargetMachine &TM) :
   setOperationAction(ISD::FFLOOR, MVT::f32, Legal);
   setOperationAction(ISD::FRINT,  MVT::f32, Legal);
   setOperationAction(ISD::FROUND, MVT::f32, Legal);
+  setOperationAction(ISD::FTRUNC, MVT::f32, Legal);
 
   // The hardware supports ROTR, but not ROTL
   setOperationAction(ISD::ROTL, MVT::i32, Expand);
@@ -184,6 +185,7 @@ AMDGPUTargetLowering::AMDGPUTargetLowering(TargetMachine &TM) :
     setOperationAction(ISD::FADD, VT, Expand);
     setOperationAction(ISD::FDIV, VT, Expand);
     setOperationAction(ISD::FFLOOR, VT, Expand);
+    setOperationAction(ISD::FTRUNC, VT, Expand);
     setOperationAction(ISD::FMUL, VT, Expand);
     setOperationAction(ISD::FRINT, VT, Expand);
     setOperationAction(ISD::FSQRT, VT, Expand);
diff --git a/lib/Target/R600/R600Instructions.td b/lib/Target/R600/R600Instructions.td
index 2249cee..cd31d36 100644
--- a/lib/Target/R600/R600Instructions.td
+++ b/lib/Target/R600/R600Instructions.td
@@ -1734,6 +1734,8 @@ def LDS_USHORT_READ_RET : R600_LDS_1A <0x39, "LDS_USHORT_READ_RET",
   def : Pat<(fp_to_sint f32:$src0), (FLT_TO_INT_eg (TRUNC $src0))>;
 
   def : Pat<(fp_to_uint f32:$src0), (FLT_TO_UINT_eg (TRUNC $src0))>;
+  // Add also trunc since we need it too.
+  def : Pat<(ftrunc f32:$src0), (TRUNC $src0)>;
 
   // SHA-256 Patterns
   def : SHA256MaPattern <BFI_INT_eg, XOR_INT>;
-- 
1.8.3.1