[InstCombine] Add a test for altivec load/store intrinsic simplification

InstCombine has logic to convert aligned Altivec load/store intrinsics into
regular loads and stores. Unfortunately, there seems to be no regression test
covering this behavior. Adding one...

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@230632 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 131 insertions, 0 deletions

diff --git a/test/Transforms/InstCombine/aligned-altivec.ll b/test/Transforms/InstCombine/aligned-altivec.ll
new file mode 100644
index 00000000000..6ac26918903
--- /dev/null
+++ b/test/Transforms/InstCombine/aligned-altivec.ll
@@ -0,0 +1,131 @@
+; RUN: opt -S -instcombine < %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"
+
+declare <4 x i32> @llvm.ppc.altivec.lvx(i8*) #1
+
+define <4 x i32> @test1(<4 x i32>* %h) #0 {
+entry:
+  %h1 = getelementptr <4 x i32>* %h, i64 1
+  %hv = bitcast <4 x i32>* %h1 to i8*
+  %vl = call <4 x i32> @llvm.ppc.altivec.lvx(i8* %hv)
+
+; CHECK-LABEL: @test1
+; CHECK: @llvm.ppc.altivec.lvx
+; CHECK: ret <4 x i32>
+
+  %v0 = load <4 x i32>* %h, align 8
+  %a = add <4 x i32> %v0, %vl
+  ret <4 x i32> %a
+}
+
+define <4 x i32> @test1a(<4 x i32>* align 16 %h) #0 {
+entry:
+  %h1 = getelementptr <4 x i32>* %h, i64 1
+  %hv = bitcast <4 x i32>* %h1 to i8*
+  %vl = call <4 x i32> @llvm.ppc.altivec.lvx(i8* %hv)
+
+; CHECK-LABEL: @test1a
+; CHECK-NOT: @llvm.ppc.altivec.lvx
+; CHECK: ret <4 x i32>
+
+  %v0 = load <4 x i32>* %h, align 8
+  %a = add <4 x i32> %v0, %vl
+  ret <4 x i32> %a
+}
+
+declare void @llvm.ppc.altivec.stvx(<4 x i32>, i8*) #0
+
+define <4 x i32> @test2(<4 x i32>* %h, <4 x i32> %d) #0 {
+entry:
+  %h1 = getelementptr <4 x i32>* %h, i64 1
+  %hv = bitcast <4 x i32>* %h1 to i8*
+  call void @llvm.ppc.altivec.stvx(<4 x i32> %d, i8* %hv)
+
+  %v0 = load <4 x i32>* %h, align 8
+  ret <4 x i32> %v0
+
+; CHECK-LABEL: @test2
+; CHECK: @llvm.ppc.altivec.stvx
+; CHECK: ret <4 x i32>
+}
+
+define <4 x i32> @test2a(<4 x i32>* align 16 %h, <4 x i32> %d) #0 {
+entry:
+  %h1 = getelementptr <4 x i32>* %h, i64 1
+  %hv = bitcast <4 x i32>* %h1 to i8*
+  call void @llvm.ppc.altivec.stvx(<4 x i32> %d, i8* %hv)
+
+  %v0 = load <4 x i32>* %h, align 8
+  ret <4 x i32> %v0
+
+; CHECK-LABEL: @test2
+; CHECK-NOT: @llvm.ppc.altivec.stvx
+; CHECK: ret <4 x i32>
+}
+
+declare <4 x i32> @llvm.ppc.altivec.lvxl(i8*) #1
+
+define <4 x i32> @test1l(<4 x i32>* %h) #0 {
+entry:
+  %h1 = getelementptr <4 x i32>* %h, i64 1
+  %hv = bitcast <4 x i32>* %h1 to i8*
+  %vl = call <4 x i32> @llvm.ppc.altivec.lvxl(i8* %hv)
+
+; CHECK-LABEL: @test1l
+; CHECK: @llvm.ppc.altivec.lvxl
+; CHECK: ret <4 x i32>
+
+  %v0 = load <4 x i32>* %h, align 8
+  %a = add <4 x i32> %v0, %vl
+  ret <4 x i32> %a
+}
+
+define <4 x i32> @test1la(<4 x i32>* align 16 %h) #0 {
+entry:
+  %h1 = getelementptr <4 x i32>* %h, i64 1
+  %hv = bitcast <4 x i32>* %h1 to i8*
+  %vl = call <4 x i32> @llvm.ppc.altivec.lvxl(i8* %hv)
+
+; CHECK-LABEL: @test1la
+; CHECK-NOT: @llvm.ppc.altivec.lvxl
+; CHECK: ret <4 x i32>
+
+  %v0 = load <4 x i32>* %h, align 8
+  %a = add <4 x i32> %v0, %vl
+  ret <4 x i32> %a
+}
+
+declare void @llvm.ppc.altivec.stvxl(<4 x i32>, i8*) #0
+
+define <4 x i32> @test2l(<4 x i32>* %h, <4 x i32> %d) #0 {
+entry:
+  %h1 = getelementptr <4 x i32>* %h, i64 1
+  %hv = bitcast <4 x i32>* %h1 to i8*
+  call void @llvm.ppc.altivec.stvxl(<4 x i32> %d, i8* %hv)
+
+  %v0 = load <4 x i32>* %h, align 8
+  ret <4 x i32> %v0
+
+; CHECK-LABEL: @test2l
+; CHECK: @llvm.ppc.altivec.stvxl
+; CHECK: ret <4 x i32>
+}
+
+define <4 x i32> @test2la(<4 x i32>* align 16 %h, <4 x i32> %d) #0 {
+entry:
+  %h1 = getelementptr <4 x i32>* %h, i64 1
+  %hv = bitcast <4 x i32>* %h1 to i8*
+  call void @llvm.ppc.altivec.stvxl(<4 x i32> %d, i8* %hv)
+
+  %v0 = load <4 x i32>* %h, align 8
+  ret <4 x i32> %v0
+
+; CHECK-LABEL: @test2l
+; CHECK-NOT: @llvm.ppc.altivec.stvxl
+; CHECK: ret <4 x i32>
+}
+
+attributes #0 = { nounwind }
+attributes #1 = { nounwind readonly }
+