[PATCH] D28403: [AArch64] Reduce vector insert/extract cost for Falkor.

[Chad Rosier via Phabricator via llvm-commits]

mcrosier created this revision.
mcrosier added a reviewer: mssimpso.
mcrosier added a subscriber: llvm-commits.
Herald added subscribers: rengolin, aemerson.

PTAL,
Chad


https://reviews.llvm.org/D28403

Files:
  lib/Target/AArch64/AArch64Subtarget.cpp
  test/Analysis/CostModel/AArch64/falkor.ll


Index: test/Analysis/CostModel/AArch64/falkor.ll
===================================================================
--- /dev/null
+++ test/Analysis/CostModel/AArch64/falkor.ll
@@ -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
+}
Index: lib/Target/AArch64/AArch64Subtarget.cpp
===================================================================
--- lib/Target/AArch64/AArch64Subtarget.cpp
+++ lib/Target/AArch64/AArch64Subtarget.cpp
@@ -71,6 +71,7 @@
     break;
   case Falkor:
     MaxInterleaveFactor = 4;
+    VectorInsertExtractBaseCost = 2;
     break;
   case Kryo:
     MaxInterleaveFactor = 4;


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