[PATCH] ARM cost model: Add costs for vector selects

[Nadav Rotem]

+  static const CostTblEntry<MVT> NEONSelectTbl[] = {
+    { ISD::SELECT,   MVT::v8i8,   1},
+    { ISD::SELECT,   MVT::v16i8,  1},
+    { ISD::SELECT,   MVT::v4i16,  1},
+    { ISD::SELECT,   MVT::v8i16,  1},
+    { ISD::SELECT,   MVT::v2i32,  1},
+    { ISD::SELECT,   MVT::v4i32,  1},
+    { ISD::SELECT,   MVT::v2i64,  1},
+    { ISD::SELECT,   MVT::v2f32,  1},
+    { ISD::SELECT,   MVT::v4f32,  1},
+    { ISD::SELECT,   MVT::v2f64,  1},
+  };
+

You don't need to use a table if you know that vector selects are free for all legal types. 

Thanks,
Nadav


On Feb 6, 2013, at 4:15 PM, Arnold Schwaighofer <aschwaighofer at apple.com> wrote:

> Vector selects are cheap on NEON. They get lowered to a vbsl instruction.
> 
> <0001-ARM-cost-model-Add-costs-for-vector-selects.patch>