[llvm] r291254 - [AArch64] Reduce vector insert/extract cost for Falkor.

[Chad Rosier via llvm-commits]

Author: mcrosier
Date: Fri Jan  6 12:03:26 2017
New Revision: 291254

URL: http://llvm.org/viewvc/llvm-project?rev=291254&view=rev
Log:
[AArch64] Reduce vector insert/extract cost for Falkor.

Differential Revision: https://reviews.llvm.org/D28403

Added:
    llvm/trunk/test/Analysis/CostModel/AArch64/falkor.ll
Modified:
    llvm/trunk/lib/Target/AArch64/AArch64Subtarget.cpp

Modified: llvm/trunk/lib/Target/AArch64/AArch64Subtarget.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/AArch64/AArch64Subtarget.cpp?rev=291254&r1=291253&r2=291254&view=diff
==============================================================================
--- llvm/trunk/lib/Target/AArch64/AArch64Subtarget.cpp (original)
+++ llvm/trunk/lib/Target/AArch64/AArch64Subtarget.cpp Fri Jan  6 12:03:26 2017
@@ -71,6 +71,7 @@ void AArch64Subtarget::initializePropert
     break;
   case Falkor:
     MaxInterleaveFactor = 4;
+    VectorInsertExtractBaseCost = 2;
     break;
   case Kryo:
     MaxInterleaveFactor = 4;

Added: llvm/trunk/test/Analysis/CostModel/AArch64/falkor.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Analysis/CostModel/AArch64/falkor.ll?rev=291254&view=auto
==============================================================================
--- llvm/trunk/test/Analysis/CostModel/AArch64/falkor.ll (added)
+++ llvm/trunk/test/Analysis/CostModel/AArch64/falkor.ll Fri Jan  6 12:03:26 2017
@@ -0,0 +1,26 @@
+; RUN: opt < %s -cost-model -analyze -mcpu=falkor | FileCheck %s
+
+target datalayout = "e-m:e-i64:64-i128:128-n32:64-S128"
+target triple = "aarch64--linux-gnu"
+
+; CHECK-LABEL: vectorInstrCost
+define void @vectorInstrCost() {
+
+    ; Vector extracts - extracting the first element should have a zero cost;
+    ; all other elements should have a cost of two.
+    ;
+    ; CHECK: cost of 0 {{.*}} extractelement <2 x i64> undef, i32 0
+    ; CHECK: cost of 2 {{.*}} extractelement <2 x i64> undef, i32 1
+    %t1 = extractelement <2 x i64> undef, i32 0
+    %t2 = extractelement <2 x i64> undef, i32 1
+
+    ; Vector inserts - inserting the first element should have a zero cost; all
+    ; other elements should have a cost of two.
+    ;
+    ; CHECK: cost of 0 {{.*}} insertelement <2 x i64> undef, i64 undef, i32 0
+    ; CHECK: cost of 2 {{.*}} insertelement <2 x i64> undef, i64 undef, i32 1
+    %t3 = insertelement <2 x i64> undef, i64 undef, i32 0
+    %t4 = insertelement <2 x i64> undef, i64 undef, i32 1
+
+    ret void
+}