PPC: Don't restrict lvsl generation to after type legalization

The PPC backend uses a target-specific DAG combine to turn unaligned Altivec
loads into a permutation-based sequence when possible. Unfortunately, the
target-specific DAG combine is not always called on all loads of interest
(sometimes the routines in DAGCombine call CombineTo such that the new node and
users are not added to the worklist); allowing the combine to trigger early
(before type legalization) mitigates this problem. Because the autovectorizers
only create legal vector types, I don't expect a lot of cases where this
optimization is enabled by type legalization in practice.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@190764 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 154 insertions, 0 deletions

diff --git a/test/CodeGen/PowerPC/unal-altivec2.ll b/test/CodeGen/PowerPC/unal-altivec2.ll
new file mode 100644
index 00000000000..0ad4b1072c2
--- /dev/null
+++ b/test/CodeGen/PowerPC/unal-altivec2.ll
@@ -0,0 +1,154 @@
+; RUN: llc -mtriple=powerpc64-unknown-linux-gnu -mcpu=pwr7 < %s | FileCheck %s
+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-f128:128:128-v128:128:128-n32:64"
+target triple = "powerpc64-unknown-linux-gnu"
+
+; Function Attrs: nounwind
+define void @foo(float* noalias nocapture %x, float* noalias nocapture readonly %y) #0 {
+entry:
+  br label %vector.body
+
+vector.body:                                      ; preds = %vector.body, %entry
+; CHECK-LABEL: @foo
+; CHECK: lvsl
+; CHECK: blr
+  %index = phi i64 [ 0, %entry ], [ %index.next.15, %vector.body ]
+  %0 = getelementptr inbounds float* %y, i64 %index
+  %1 = bitcast float* %0 to <4 x float>*
+  %wide.load = load <4 x float>* %1, align 4
+  %2 = call <4 x float> @llvm_cos_v4f32(<4 x float> %wide.load)
+  %3 = getelementptr inbounds float* %x, i64 %index
+  %4 = bitcast float* %3 to <4 x float>*
+  store <4 x float> %2, <4 x float>* %4, align 4
+  %index.next = add i64 %index, 4
+  %5 = getelementptr inbounds float* %y, i64 %index.next
+  %6 = bitcast float* %5 to <4 x float>*
+  %wide.load.1 = load <4 x float>* %6, align 4
+  %7 = call <4 x float> @llvm_cos_v4f32(<4 x float> %wide.load.1)
+  %8 = getelementptr inbounds float* %x, i64 %index.next
+  %9 = bitcast float* %8 to <4 x float>*
+  store <4 x float> %7, <4 x float>* %9, align 4
+  %index.next.1 = add i64 %index.next, 4
+  %10 = getelementptr inbounds float* %y, i64 %index.next.1
+  %11 = bitcast float* %10 to <4 x float>*
+  %wide.load.2 = load <4 x float>* %11, align 4
+  %12 = call <4 x float> @llvm_cos_v4f32(<4 x float> %wide.load.2)
+  %13 = getelementptr inbounds float* %x, i64 %index.next.1
+  %14 = bitcast float* %13 to <4 x float>*
+  store <4 x float> %12, <4 x float>* %14, align 4
+  %index.next.2 = add i64 %index.next.1, 4
+  %15 = getelementptr inbounds float* %y, i64 %index.next.2
+  %16 = bitcast float* %15 to <4 x float>*
+  %wide.load.3 = load <4 x float>* %16, align 4
+  %17 = call <4 x float> @llvm_cos_v4f32(<4 x float> %wide.load.3)
+  %18 = getelementptr inbounds float* %x, i64 %index.next.2
+  %19 = bitcast float* %18 to <4 x float>*
+  store <4 x float> %17, <4 x float>* %19, align 4
+  %index.next.3 = add i64 %index.next.2, 4
+  %20 = getelementptr inbounds float* %y, i64 %index.next.3
+  %21 = bitcast float* %20 to <4 x float>*
+  %wide.load.4 = load <4 x float>* %21, align 4
+  %22 = call <4 x float> @llvm_cos_v4f32(<4 x float> %wide.load.4)
+  %23 = getelementptr inbounds float* %x, i64 %index.next.3
+  %24 = bitcast float* %23 to <4 x float>*
+  store <4 x float> %22, <4 x float>* %24, align 4
+  %index.next.4 = add i64 %index.next.3, 4
+  %25 = getelementptr inbounds float* %y, i64 %index.next.4
+  %26 = bitcast float* %25 to <4 x float>*
+  %wide.load.5 = load <4 x float>* %26, align 4
+  %27 = call <4 x float> @llvm_cos_v4f32(<4 x float> %wide.load.5)
+  %28 = getelementptr inbounds float* %x, i64 %index.next.4
+  %29 = bitcast float* %28 to <4 x float>*
+  store <4 x float> %27, <4 x float>* %29, align 4
+  %index.next.5 = add i64 %index.next.4, 4
+  %30 = getelementptr inbounds float* %y, i64 %index.next.5
+  %31 = bitcast float* %30 to <4 x float>*
+  %wide.load.6 = load <4 x float>* %31, align 4
+  %32 = call <4 x float> @llvm_cos_v4f32(<4 x float> %wide.load.6)
+  %33 = getelementptr inbounds float* %x, i64 %index.next.5
+  %34 = bitcast float* %33 to <4 x float>*
+  store <4 x float> %32, <4 x float>* %34, align 4
+  %index.next.6 = add i64 %index.next.5, 4
+  %35 = getelementptr inbounds float* %y, i64 %index.next.6
+  %36 = bitcast float* %35 to <4 x float>*
+  %wide.load.7 = load <4 x float>* %36, align 4
+  %37 = call <4 x float> @llvm_cos_v4f32(<4 x float> %wide.load.7)
+  %38 = getelementptr inbounds float* %x, i64 %index.next.6
+  %39 = bitcast float* %38 to <4 x float>*
+  store <4 x float> %37, <4 x float>* %39, align 4
+  %index.next.7 = add i64 %index.next.6, 4
+  %40 = getelementptr inbounds float* %y, i64 %index.next.7
+  %41 = bitcast float* %40 to <4 x float>*
+  %wide.load.8 = load <4 x float>* %41, align 4
+  %42 = call <4 x float> @llvm_cos_v4f32(<4 x float> %wide.load.8)
+  %43 = getelementptr inbounds float* %x, i64 %index.next.7
+  %44 = bitcast float* %43 to <4 x float>*
+  store <4 x float> %42, <4 x float>* %44, align 4
+  %index.next.8 = add i64 %index.next.7, 4
+  %45 = getelementptr inbounds float* %y, i64 %index.next.8
+  %46 = bitcast float* %45 to <4 x float>*
+  %wide.load.9 = load <4 x float>* %46, align 4
+  %47 = call <4 x float> @llvm_cos_v4f32(<4 x float> %wide.load.9)
+  %48 = getelementptr inbounds float* %x, i64 %index.next.8
+  %49 = bitcast float* %48 to <4 x float>*
+  store <4 x float> %47, <4 x float>* %49, align 4
+  %index.next.9 = add i64 %index.next.8, 4
+  %50 = getelementptr inbounds float* %y, i64 %index.next.9
+  %51 = bitcast float* %50 to <4 x float>*
+  %wide.load.10 = load <4 x float>* %51, align 4
+  %52 = call <4 x float> @llvm_cos_v4f32(<4 x float> %wide.load.10)
+  %53 = getelementptr inbounds float* %x, i64 %index.next.9
+  %54 = bitcast float* %53 to <4 x float>*
+  store <4 x float> %52, <4 x float>* %54, align 4
+  %index.next.10 = add i64 %index.next.9, 4
+  %55 = getelementptr inbounds float* %y, i64 %index.next.10
+  %56 = bitcast float* %55 to <4 x float>*
+  %wide.load.11 = load <4 x float>* %56, align 4
+  %57 = call <4 x float> @llvm_cos_v4f32(<4 x float> %wide.load.11)
+  %58 = getelementptr inbounds float* %x, i64 %index.next.10
+  %59 = bitcast float* %58 to <4 x float>*
+  store <4 x float> %57, <4 x float>* %59, align 4
+  %index.next.11 = add i64 %index.next.10, 4
+  %60 = getelementptr inbounds float* %y, i64 %index.next.11
+  %61 = bitcast float* %60 to <4 x float>*
+  %wide.load.12 = load <4 x float>* %61, align 4
+  %62 = call <4 x float> @llvm_cos_v4f32(<4 x float> %wide.load.12)
+  %63 = getelementptr inbounds float* %x, i64 %index.next.11
+  %64 = bitcast float* %63 to <4 x float>*
+  store <4 x float> %62, <4 x float>* %64, align 4
+  %index.next.12 = add i64 %index.next.11, 4
+  %65 = getelementptr inbounds float* %y, i64 %index.next.12
+  %66 = bitcast float* %65 to <4 x float>*
+  %wide.load.13 = load <4 x float>* %66, align 4
+  %67 = call <4 x float> @llvm_cos_v4f32(<4 x float> %wide.load.13)
+  %68 = getelementptr inbounds float* %x, i64 %index.next.12
+  %69 = bitcast float* %68 to <4 x float>*
+  store <4 x float> %67, <4 x float>* %69, align 4
+  %index.next.13 = add i64 %index.next.12, 4
+  %70 = getelementptr inbounds float* %y, i64 %index.next.13
+  %71 = bitcast float* %70 to <4 x float>*
+  %wide.load.14 = load <4 x float>* %71, align 4
+  %72 = call <4 x float> @llvm_cos_v4f32(<4 x float> %wide.load.14)
+  %73 = getelementptr inbounds float* %x, i64 %index.next.13
+  %74 = bitcast float* %73 to <4 x float>*
+  store <4 x float> %72, <4 x float>* %74, align 4
+  %index.next.14 = add i64 %index.next.13, 4
+  %75 = getelementptr inbounds float* %y, i64 %index.next.14
+  %76 = bitcast float* %75 to <4 x float>*
+  %wide.load.15 = load <4 x float>* %76, align 4
+  %77 = call <4 x float> @llvm_cos_v4f32(<4 x float> %wide.load.15)
+  %78 = getelementptr inbounds float* %x, i64 %index.next.14
+  %79 = bitcast float* %78 to <4 x float>*
+  store <4 x float> %77, <4 x float>* %79, align 4
+  %index.next.15 = add i64 %index.next.14, 4
+  %80 = icmp eq i64 %index.next.15, 2048
+  br i1 %80, label %for.end, label %vector.body
+
+for.end:                                          ; preds = %vector.body
+  ret void
+}
+
+; Function Attrs: nounwind readonly
+declare <4 x float> @llvm_cos_v4f32(<4 x float>) #1
+
+attributes #0 = { nounwind }
+attributes #1 = { nounwind readonly }