[Mesa-dev] [PATCH 2/2] R600: Add a pattern for fma (fused multiply add)

[Tom Stellard]

From: Tom Stellard <thomas.stellard at amd.com>

NOTE: This is a candidate for the Mesa stable branches
---
 lib/Target/R600/R600Instructions.td |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/lib/Target/R600/R600Instructions.td b/lib/Target/R600/R600Instructions.td
index d307ed2..07ee6f0 100644
--- a/lib/Target/R600/R600Instructions.td
+++ b/lib/Target/R600/R600Instructions.td
@@ -1109,6 +1109,11 @@ class TGSI_LIT_Z_Common <InstR600 mul_lit, InstR600 log_clamped, InstR600 exp_ie
   (exp_ieee (mul_lit (log_clamped (MAX R600_Reg32:$src_y, (f32 ZERO))), R600_Reg32:$src_w, R600_Reg32:$src_x))
 >;
 
+class FMAPat <InstR600 muladd> : Pat<
+  (fma R600_Reg32:$src0, R600_Reg32:$src1, R600_Reg32:$src2),
+  (muladd R600_Reg32:$src0, R600_Reg32:$src1, R600_Reg32:$src2)
+>;
+
 //===----------------------------------------------------------------------===//
 // R600 / R700 Instructions
 //===----------------------------------------------------------------------===//
@@ -1167,6 +1172,7 @@ let Predicates = [isR600] in {
     let Word1{31} = 1; // BARRIER
   }
   defm : SteamOutputExportPattern<R600_ExportBuf, 0x20, 0x21, 0x22, 0x23>;
+  def : FMAPat <MULADD_r600>;
 }
 
 // Helper pattern for normalizing inputs to triginomic instructions for R700+
@@ -1320,6 +1326,7 @@ let hasSideEffects = 1 in {
     let Word1{31} = 1; // BARRIER
   }
   defm : SteamOutputExportPattern<EG_ExportBuf, 0x40, 0x41, 0x42, 0x43>;
+  def : FMAPat <MULADD_eg>;
 
 //===----------------------------------------------------------------------===//
 // Memory read/write instructions
-- 
1.7.8.6