Add a flag vectorizer-maximize-bandwidth in loop vectorizer to enable using larger...

[oota-llvm.git] / test / Transforms / LoopVectorize / X86 / vector_max_bandwidth.ll

diff --git a/test/Transforms/LoopVectorize/X86/vector_max_bandwidth.ll b/test/Transforms/LoopVectorize/X86/vector_max_bandwidth.ll
new file mode 100644 (file)
index 0000000..e6dc39c
--- /dev/null
+++ b/test/Transforms/LoopVectorize/X86/vector_max_bandwidth.ll
@@ -0,0 +1,46 @@
+; RUN: opt -loop-vectorize -vectorizer-maximize-bandwidth -mcpu=corei7-avx -debug-only=loop-vectorize -S < %s 2>&1 | FileCheck %s
+; REQUIRES: asserts
+
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-linux-gnu"
+
+@a = global [1000 x i8] zeroinitializer, align 16
+@b = global [1000 x i8] zeroinitializer, align 16
+@c = global [1000 x i8] zeroinitializer, align 16
+@u = global [1000 x i32] zeroinitializer, align 16
+@v = global [1000 x i32] zeroinitializer, align 16
+@w = global [1000 x i32] zeroinitializer, align 16
+
+; Tests that the vectorization factor is determined by the smallest instead of
+; widest type in the loop for maximum bandwidth when
+; -vectorizer-maximize-bandwidth is indicated.
+;
+; CHECK-label: foo
+; CHECK: LV: Selecting VF: 16.
+define void @foo() {
+entry:
+  br label %for.body
+
+for.cond.cleanup:
+  ret void
+
+for.body:
+  %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
+  %arrayidx = getelementptr inbounds [1000 x i8], [1000 x i8]* @b, i64 0, i64 %indvars.iv
+  %0 = load i8, i8* %arrayidx, align 1
+  %arrayidx2 = getelementptr inbounds [1000 x i8], [1000 x i8]* @c, i64 0, i64 %indvars.iv
+  %1 = load i8, i8* %arrayidx2, align 1
+  %add = add i8 %1, %0
+  %arrayidx6 = getelementptr inbounds [1000 x i8], [1000 x i8]* @a, i64 0, i64 %indvars.iv
+  store i8 %add, i8* %arrayidx6, align 1
+  %arrayidx8 = getelementptr inbounds [1000 x i32], [1000 x i32]* @v, i64 0, i64 %indvars.iv
+  %2 = load i32, i32* %arrayidx8, align 4
+  %arrayidx10 = getelementptr inbounds [1000 x i32], [1000 x i32]* @w, i64 0, i64 %indvars.iv
+  %3 = load i32, i32* %arrayidx10, align 4
+  %add11 = add nsw i32 %3, %2
+  %arrayidx13 = getelementptr inbounds [1000 x i32], [1000 x i32]* @u, i64 0, i64 %indvars.iv
+  store i32 %add11, i32* %arrayidx13, align 4
+  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
+  %exitcond = icmp eq i64 %indvars.iv.next, 1000
+  br i1 %exitcond, label %for.cond.cleanup, label %for.body
+}