Change max interleave factor to 12 for POWER7 and POWER8.

[oota-llvm.git] / lib / Target / PowerPC / PPCTargetTransformInfo.cpp

diff --git a/lib/Target/PowerPC/PPCTargetTransformInfo.cpp b/lib/Target/PowerPC/PPCTargetTransformInfo.cpp
index 4003b1b0812e21bae37d3bd782ccbeb6940940e8..e1d46f725428fc183c3fd7b85eed7a00f5014ddb 100644 (file)
--- a/lib/Target/PowerPC/PPCTargetTransformInfo.cpp
+++ b/lib/Target/PowerPC/PPCTargetTransformInfo.cpp
@@ -226,6 +226,12 @@ unsigned PPCTTIImpl::getMaxInterleaveFactor() {
   if (Directive == PPC::DIR_E500mc || Directive == PPC::DIR_E5500)
     return 1;
 
+  // For P7 and P8, floating-point instructions have a 6-cycle latency and
+  // there are two execution units, so unroll by 12x for latency hiding.
+  if (Directive == PPC::DIR_PWR7 ||
+      Directive == PPC::DIR_PWR8)
+    return 12;
+
   // For most things, modern systems have two execution units (and
   // out-of-order execution).
   return 2;