[LV] For some IVs, use vector phis instead of widening in the loop body

Previously, whenever we needed a vector IV, we would create it on the fly,
by splatting the scalar IV and adding a step vector. Instead, we can create a
real vector IV. This tends to save a couple of instructions per iteration.

This only changes the behavior for the most basic case - integer primary
IVs with a constant step.

Differential Revision: http://reviews.llvm.org/D20315

llvm-svn: 271410

1 files changed, 3 insertions, 3 deletions

diff --git a/llvm/test/Transforms/LoopVectorize/X86/gather_scatter.ll b/llvm/test/Transforms/LoopVectorize/X86/gather_scatter.ll
index 2f1de54d5f9..23e363eae02 100644
--- a/llvm/test/Transforms/LoopVectorize/X86/gather_scatter.ll
+++ b/llvm/test/Transforms/LoopVectorize/X86/gather_scatter.ll
@@ -95,7 +95,7 @@ for.end:                                          ; preds = %for.cond
 %struct.In = type { float, float }
 
 ;AVX512-LABEL: @foo2
-;AVX512: getelementptr %struct.In, %struct.In* %in, <16 x i64> %induction, i32 1
+;AVX512: getelementptr %struct.In, %struct.In* %in, <16 x i64> %{{.*}}, i32 1
 ;AVX512: llvm.masked.gather.v16f32
 ;AVX512: llvm.masked.store.v16f32
 ;AVX512: ret void
@@ -170,10 +170,10 @@ for.end:                                          ; preds = %for.cond
 ;}
 
 ;AVX512-LABEL: @foo3
-;AVX512: getelementptr %struct.In, %struct.In* %in, <16 x i64> %induction, i32 1
+;AVX512: getelementptr %struct.In, %struct.In* %in, <16 x i64> %{{.*}}, i32 1
 ;AVX512: llvm.masked.gather.v16f32
 ;AVX512: fadd <16 x float>
-;AVX512: getelementptr %struct.Out, %struct.Out* %out, <16 x i64> %induction, i32 1
+;AVX512: getelementptr %struct.Out, %struct.Out* %out, <16 x i64> %{{.*}}, i32 1
 ;AVX512: llvm.masked.scatter.v16f32
 ;AVX512: ret void