Add support for pointer induction variables even when there is no integer induction variable.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@168558 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 33 insertions, 0 deletions

diff --git a/test/Transforms/LoopVectorize/no_int_induction.ll b/test/Transforms/LoopVectorize/no_int_induction.ll
new file mode 100644
index 0000000000..516fd1de07
--- /dev/null
+++ b/test/Transforms/LoopVectorize/no_int_induction.ll
@@ -0,0 +1,33 @@
+; RUN: opt < %s  -loop-vectorize -force-vector-width=4 -dce -instcombine -licm -S | FileCheck %s
+
+; int __attribute__((noinline)) sum_array(int *A, int n) {
+;  return std::accumulate(A, A + n, 0);
+; }
+
+target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
+target triple = "x86_64-apple-macosx10.8.0"
+
+;CHECK: @sum_array
+;CHECK: phi <4 x i32>
+;CHECK: load <4 x i32>
+;CHECK: add nsw <4 x i32>
+;CHECK: ret i32
+define i32 @sum_array(i32* %A, i32 %n) nounwind uwtable readonly noinline ssp {
+  %1 = sext i32 %n to i64
+  %2 = getelementptr inbounds i32* %A, i64 %1
+  %3 = icmp eq i32 %n, 0
+  br i1 %3, label %_ZSt10accumulateIPiiET0_T_S2_S1_.exit, label %.lr.ph.i
+
+.lr.ph.i:                                         ; preds = %0, %.lr.ph.i
+  %.03.i = phi i32* [ %6, %.lr.ph.i ], [ %A, %0 ]
+  %.012.i = phi i32 [ %5, %.lr.ph.i ], [ 0, %0 ]
+  %4 = load i32* %.03.i, align 4
+  %5 = add nsw i32 %4, %.012.i
+  %6 = getelementptr inbounds i32* %.03.i, i64 1
+  %7 = icmp eq i32* %6, %2
+  br i1 %7, label %_ZSt10accumulateIPiiET0_T_S2_S1_.exit, label %.lr.ph.i
+
+_ZSt10accumulateIPiiET0_T_S2_S1_.exit:            ; preds = %.lr.ph.i, %0
+  %.01.lcssa.i = phi i32 [ 0, %0 ], [ %5, %.lr.ph.i ]
+  ret i32 %.01.lcssa.i
+}