[WebAssembly] Process p2align operands for SIMD loads and stores

Reviewers: aheejin, dschuff

Subscribers: sbc100, jgravelle-google, sunfish, llvm-commits

Differential Revision: https://reviews.llvm.org/D53886

llvm-svn: 345795

1 files changed, 534 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/WebAssembly/simd-load-store-alignment.ll b/llvm/test/CodeGen/WebAssembly/simd-load-store-alignment.ll
new file mode 100644
index 00000000000..f113840c049
--- /dev/null
+++ b/llvm/test/CodeGen/WebAssembly/simd-load-store-alignment.ll
@@ -0,0 +1,534 @@
+; RUN: llc < %s -asm-verbose=false -disable-wasm-fallthrough-return-opt -wasm-disable-explicit-locals -wasm-keep-registers -wasm-enable-unimplemented-simd -mattr=+simd128 | FileCheck %s
+
+; Test loads and stores with custom alignment values.
+
+target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128"
+target triple = "wasm32-unknown-unknown"
+
+; ==============================================================================
+; 16 x i8
+; ==============================================================================
+
+; CHECK-LABEL: load_v16i8_a1:
+; CHECK-NEXT: .param i32{{$}}
+; CHECK-NEXT: .result v128{{$}}
+; CHECK-NEXT: v128.load $push[[R:[0-9]+]]=, 0($0):p2align=0{{$}}
+; CHECK-NEXT: return $pop[[R]]{{$}}
+define <16 x i8> @load_v16i8_a1(<16 x i8> *%p) {
+  %v = load <16 x i8>, <16 x i8>* %p, align 1
+  ret <16 x i8> %v
+}
+
+; CHECK-LABEL: load_v16i8_a4:
+; CHECK-NEXT: .param i32{{$}}
+; CHECK-NEXT: .result v128{{$}}
+; CHECK-NEXT: v128.load $push[[R:[0-9]+]]=, 0($0):p2align=2{{$}}
+; CHECK-NEXT: return $pop[[R]]{{$}}
+define <16 x i8> @load_v16i8_a4(<16 x i8> *%p) {
+  %v = load <16 x i8>, <16 x i8>* %p, align 4
+  ret <16 x i8> %v
+}
+
+; 16 is the default alignment for v128 so no attribute is needed.
+
+; CHECK-LABEL: load_v16i8_a16:
+; CHECK-NEXT: .param i32{{$}}
+; CHECK-NEXT: .result v128{{$}}
+; CHECK-NEXT: v128.load $push[[R:[0-9]+]]=, 0($0){{$}}
+; CHECK-NEXT: return $pop[[R]]{{$}}
+define <16 x i8> @load_v16i8_a16(<16 x i8> *%p) {
+  %v = load <16 x i8>, <16 x i8>* %p, align 16
+  ret <16 x i8> %v
+}
+
+; 32 is greater than the default alignment so it is ignored.
+
+; CHECK-LABEL: load_v16i8_a32:
+; CHECK-NEXT: .param i32{{$}}
+; CHECK-NEXT: .result v128{{$}}
+; CHECK-NEXT: v128.load $push[[R:[0-9]+]]=, 0($0){{$}}
+; CHECK-NEXT: return $pop[[R]]{{$}}
+define <16 x i8> @load_v16i8_a32(<16 x i8> *%p) {
+  %v = load <16 x i8>, <16 x i8>* %p, align 32
+  ret <16 x i8> %v
+}
+
+; CHECK-LABEL: store_v16i8_a1:
+; CHECK-NEXT: .param i32, v128{{$}}
+; CHECK-NEXT: v128.store 0($0):p2align=0, $1{{$}}
+; CHECK-NEXT: return{{$}}
+define void @store_v16i8_a1(<16 x i8> *%p, <16 x i8> %v) {
+  store <16 x i8> %v, <16 x i8>* %p, align 1
+  ret void
+}
+
+; CHECK-LABEL: store_v16i8_a4:
+; CHECK-NEXT: .param i32, v128{{$}}
+; CHECK-NEXT: v128.store 0($0):p2align=2, $1{{$}}
+; CHECK-NEXT: return{{$}}
+define void @store_v16i8_a4(<16 x i8> *%p, <16 x i8> %v) {
+  store <16 x i8> %v, <16 x i8>* %p, align 4
+  ret void
+}
+
+; 16 is the default alignment for v128 so no attribute is needed.
+
+; CHECK-LABEL: store_v16i8_a16:
+; CHECK-NEXT: .param i32, v128{{$}}
+; CHECK-NEXT: v128.store 0($0), $1{{$}}
+; CHECK-NEXT: return{{$}}
+define void @store_v16i8_a16(<16 x i8> *%p, <16 x i8> %v) {
+  store <16 x i8> %v, <16 x i8>* %p, align 16
+  ret void
+}
+
+; 32 is greater than the default alignment so it is ignored.
+
+; CHECK-LABEL: store_v16i8_a32:
+; CHECK-NEXT: .param i32, v128{{$}}
+; CHECK-NEXT: v128.store 0($0), $1{{$}}
+; CHECK-NEXT: return{{$}}
+define void @store_v16i8_a32(<16 x i8> *%p, <16 x i8> %v) {
+  store <16 x i8> %v, <16 x i8>* %p, align 32
+  ret void
+}
+
+; ==============================================================================
+; 8 x i16
+; ==============================================================================
+
+; CHECK-LABEL: load_v8i16_a1:
+; CHECK-NEXT: .param i32{{$}}
+; CHECK-NEXT: .result v128{{$}}
+; CHECK-NEXT: v128.load $push[[R:[0-9]+]]=, 0($0):p2align=0{{$}}
+; CHECK-NEXT: return $pop[[R]]{{$}}
+define <8 x i16> @load_v8i16_a1(<8 x i16> *%p) {
+  %v = load <8 x i16>, <8 x i16>* %p, align 1
+  ret <8 x i16> %v
+}
+
+; CHECK-LABEL: load_v8i16_a4:
+; CHECK-NEXT: .param i32{{$}}
+; CHECK-NEXT: .result v128{{$}}
+; CHECK-NEXT: v128.load $push[[R:[0-9]+]]=, 0($0):p2align=2{{$}}
+; CHECK-NEXT: return $pop[[R]]{{$}}
+define <8 x i16> @load_v8i16_a4(<8 x i16> *%p) {
+  %v = load <8 x i16>, <8 x i16>* %p, align 4
+  ret <8 x i16> %v
+}
+
+; 8 is the default alignment for v128 so no attribute is needed.
+
+; CHECK-LABEL: load_v8i16_a16:
+; CHECK-NEXT: .param i32{{$}}
+; CHECK-NEXT: .result v128{{$}}
+; CHECK-NEXT: v128.load $push[[R:[0-9]+]]=, 0($0){{$}}
+; CHECK-NEXT: return $pop[[R]]{{$}}
+define <8 x i16> @load_v8i16_a16(<8 x i16> *%p) {
+  %v = load <8 x i16>, <8 x i16>* %p, align 16
+  ret <8 x i16> %v
+}
+
+; 32 is greater than the default alignment so it is ignored.
+
+; CHECK-LABEL: load_v8i16_a32:
+; CHECK-NEXT: .param i32{{$}}
+; CHECK-NEXT: .result v128{{$}}
+; CHECK-NEXT: v128.load $push[[R:[0-9]+]]=, 0($0){{$}}
+; CHECK-NEXT: return $pop[[R]]{{$}}
+define <8 x i16> @load_v8i16_a32(<8 x i16> *%p) {
+  %v = load <8 x i16>, <8 x i16>* %p, align 32
+  ret <8 x i16> %v
+}
+
+; CHECK-LABEL: store_v8i16_a1:
+; CHECK-NEXT: .param i32, v128{{$}}
+; CHECK-NEXT: v128.store 0($0):p2align=0, $1{{$}}
+; CHECK-NEXT: return{{$}}
+define void @store_v8i16_a1(<8 x i16> *%p, <8 x i16> %v) {
+  store <8 x i16> %v, <8 x i16>* %p, align 1
+  ret void
+}
+
+; CHECK-LABEL: store_v8i16_a4:
+; CHECK-NEXT: .param i32, v128{{$}}
+; CHECK-NEXT: v128.store 0($0):p2align=2, $1{{$}}
+; CHECK-NEXT: return{{$}}
+define void @store_v8i16_a4(<8 x i16> *%p, <8 x i16> %v) {
+  store <8 x i16> %v, <8 x i16>* %p, align 4
+  ret void
+}
+
+; 16 is the default alignment for v128 so no attribute is needed.
+
+; CHECK-LABEL: store_v8i16_a16:
+; CHECK-NEXT: .param i32, v128{{$}}
+; CHECK-NEXT: v128.store 0($0), $1{{$}}
+; CHECK-NEXT: return{{$}}
+define void @store_v8i16_a16(<8 x i16> *%p, <8 x i16> %v) {
+  store <8 x i16> %v, <8 x i16>* %p, align 16
+  ret void
+}
+
+; 32 is greater than the default alignment so it is ignored.
+
+; CHECK-LABEL: store_v8i16_a32:
+; CHECK-NEXT: .param i32, v128{{$}}
+; CHECK-NEXT: v128.store 0($0), $1{{$}}
+; CHECK-NEXT: return{{$}}
+define void @store_v8i16_a32(<8 x i16> *%p, <8 x i16> %v) {
+  store <8 x i16> %v, <8 x i16>* %p, align 32
+  ret void
+}
+
+; ==============================================================================
+; 4 x i32
+; ==============================================================================
+
+; CHECK-LABEL: load_v4i32_a1:
+; CHECK-NEXT: .param i32{{$}}
+; CHECK-NEXT: .result v128{{$}}
+; CHECK-NEXT: v128.load $push[[R:[0-9]+]]=, 0($0):p2align=0{{$}}
+; CHECK-NEXT: return $pop[[R]]{{$}}
+define <4 x i32> @load_v4i32_a1(<4 x i32> *%p) {
+  %v = load <4 x i32>, <4 x i32>* %p, align 1
+  ret <4 x i32> %v
+}
+
+; CHECK-LABEL: load_v4i32_a4:
+; CHECK-NEXT: .param i32{{$}}
+; CHECK-NEXT: .result v128{{$}}
+; CHECK-NEXT: v128.load $push[[R:[0-9]+]]=, 0($0):p2align=2{{$}}
+; CHECK-NEXT: return $pop[[R]]{{$}}
+define <4 x i32> @load_v4i32_a4(<4 x i32> *%p) {
+  %v = load <4 x i32>, <4 x i32>* %p, align 4
+  ret <4 x i32> %v
+}
+
+; 4 is the default alignment for v128 so no attribute is needed.
+
+; CHECK-LABEL: load_v4i32_a16:
+; CHECK-NEXT: .param i32{{$}}
+; CHECK-NEXT: .result v128{{$}}
+; CHECK-NEXT: v128.load $push[[R:[0-9]+]]=, 0($0){{$}}
+; CHECK-NEXT: return $pop[[R]]{{$}}
+define <4 x i32> @load_v4i32_a16(<4 x i32> *%p) {
+  %v = load <4 x i32>, <4 x i32>* %p, align 16
+  ret <4 x i32> %v
+}
+
+; 32 is greater than the default alignment so it is ignored.
+
+; CHECK-LABEL: load_v4i32_a32:
+; CHECK-NEXT: .param i32{{$}}
+; CHECK-NEXT: .result v128{{$}}
+; CHECK-NEXT: v128.load $push[[R:[0-9]+]]=, 0($0){{$}}
+; CHECK-NEXT: return $pop[[R]]{{$}}
+define <4 x i32> @load_v4i32_a32(<4 x i32> *%p) {
+  %v = load <4 x i32>, <4 x i32>* %p, align 32
+  ret <4 x i32> %v
+}
+
+; CHECK-LABEL: store_v4i32_a1:
+; CHECK-NEXT: .param i32, v128{{$}}
+; CHECK-NEXT: v128.store 0($0):p2align=0, $1{{$}}
+; CHECK-NEXT: return{{$}}
+define void @store_v4i32_a1(<4 x i32> *%p, <4 x i32> %v) {
+  store <4 x i32> %v, <4 x i32>* %p, align 1
+  ret void
+}
+
+; CHECK-LABEL: store_v4i32_a4:
+; CHECK-NEXT: .param i32, v128{{$}}
+; CHECK-NEXT: v128.store 0($0):p2align=2, $1{{$}}
+; CHECK-NEXT: return{{$}}
+define void @store_v4i32_a4(<4 x i32> *%p, <4 x i32> %v) {
+  store <4 x i32> %v, <4 x i32>* %p, align 4
+  ret void
+}
+
+; 16 is the default alignment for v128 so no attribute is needed.
+
+; CHECK-LABEL: store_v4i32_a16:
+; CHECK-NEXT: .param i32, v128{{$}}
+; CHECK-NEXT: v128.store 0($0), $1{{$}}
+; CHECK-NEXT: return{{$}}
+define void @store_v4i32_a16(<4 x i32> *%p, <4 x i32> %v) {
+  store <4 x i32> %v, <4 x i32>* %p, align 16
+  ret void
+}
+
+; 32 is greater than the default alignment so it is ignored.
+
+; CHECK-LABEL: store_v4i32_a32:
+; CHECK-NEXT: .param i32, v128{{$}}
+; CHECK-NEXT: v128.store 0($0), $1{{$}}
+; CHECK-NEXT: return{{$}}
+define void @store_v4i32_a32(<4 x i32> *%p, <4 x i32> %v) {
+  store <4 x i32> %v, <4 x i32>* %p, align 32
+  ret void
+}
+
+; ==============================================================================
+; 2 x i64
+; ==============================================================================
+
+; CHECK-LABEL: load_v2i64_a1:
+; CHECK-NEXT: .param i32{{$}}
+; CHECK-NEXT: .result v128{{$}}
+; CHECK-NEXT: v128.load $push[[R:[0-9]+]]=, 0($0):p2align=0{{$}}
+; CHECK-NEXT: return $pop[[R]]{{$}}
+define <2 x i64> @load_v2i64_a1(<2 x i64> *%p) {
+  %v = load <2 x i64>, <2 x i64>* %p, align 1
+  ret <2 x i64> %v
+}
+
+; CHECK-LABEL: load_v2i64_a4:
+; CHECK-NEXT: .param i32{{$}}
+; CHECK-NEXT: .result v128{{$}}
+; CHECK-NEXT: v128.load $push[[R:[0-9]+]]=, 0($0):p2align=2{{$}}
+; CHECK-NEXT: return $pop[[R]]{{$}}
+define <2 x i64> @load_v2i64_a4(<2 x i64> *%p) {
+  %v = load <2 x i64>, <2 x i64>* %p, align 4
+  ret <2 x i64> %v
+}
+
+; 2 is the default alignment for v128 so no attribute is needed.
+
+; CHECK-LABEL: load_v2i64_a16:
+; CHECK-NEXT: .param i32{{$}}
+; CHECK-NEXT: .result v128{{$}}
+; CHECK-NEXT: v128.load $push[[R:[0-9]+]]=, 0($0){{$}}
+; CHECK-NEXT: return $pop[[R]]{{$}}
+define <2 x i64> @load_v2i64_a16(<2 x i64> *%p) {
+  %v = load <2 x i64>, <2 x i64>* %p, align 16
+  ret <2 x i64> %v
+}
+
+; 32 is greater than the default alignment so it is ignored.
+
+; CHECK-LABEL: load_v2i64_a32:
+; CHECK-NEXT: .param i32{{$}}
+; CHECK-NEXT: .result v128{{$}}
+; CHECK-NEXT: v128.load $push[[R:[0-9]+]]=, 0($0){{$}}
+; CHECK-NEXT: return $pop[[R]]{{$}}
+define <2 x i64> @load_v2i64_a32(<2 x i64> *%p) {
+  %v = load <2 x i64>, <2 x i64>* %p, align 32
+  ret <2 x i64> %v
+}
+
+; CHECK-LABEL: store_v2i64_a1:
+; CHECK-NEXT: .param i32, v128{{$}}
+; CHECK-NEXT: v128.store 0($0):p2align=0, $1{{$}}
+; CHECK-NEXT: return{{$}}
+define void @store_v2i64_a1(<2 x i64> *%p, <2 x i64> %v) {
+  store <2 x i64> %v, <2 x i64>* %p, align 1
+  ret void
+}
+
+; CHECK-LABEL: store_v2i64_a4:
+; CHECK-NEXT: .param i32, v128{{$}}
+; CHECK-NEXT: v128.store 0($0):p2align=2, $1{{$}}
+; CHECK-NEXT: return{{$}}
+define void @store_v2i64_a4(<2 x i64> *%p, <2 x i64> %v) {
+  store <2 x i64> %v, <2 x i64>* %p, align 4
+  ret void
+}
+
+; 16 is the default alignment for v128 so no attribute is needed.
+
+; CHECK-LABEL: store_v2i64_a16:
+; CHECK-NEXT: .param i32, v128{{$}}
+; CHECK-NEXT: v128.store 0($0), $1{{$}}
+; CHECK-NEXT: return{{$}}
+define void @store_v2i64_a16(<2 x i64> *%p, <2 x i64> %v) {
+  store <2 x i64> %v, <2 x i64>* %p, align 16
+  ret void
+}
+
+; 32 is greater than the default alignment so it is ignored.
+
+; CHECK-LABEL: store_v2i64_a32:
+; CHECK-NEXT: .param i32, v128{{$}}
+; CHECK-NEXT: v128.store 0($0), $1{{$}}
+; CHECK-NEXT: return{{$}}
+define void @store_v2i64_a32(<2 x i64> *%p, <2 x i64> %v) {
+  store <2 x i64> %v, <2 x i64>* %p, align 32
+  ret void
+}
+
+; ==============================================================================
+; 4 x float
+; ==============================================================================
+
+; CHECK-LABEL: load_v4f32_a1:
+; CHECK-NEXT: .param i32{{$}}
+; CHECK-NEXT: .result v128{{$}}
+; CHECK-NEXT: v128.load $push[[R:[0-9]+]]=, 0($0):p2align=0{{$}}
+; CHECK-NEXT: return $pop[[R]]{{$}}
+define <4 x float> @load_v4f32_a1(<4 x float> *%p) {
+  %v = load <4 x float>, <4 x float>* %p, align 1
+  ret <4 x float> %v
+}
+
+; CHECK-LABEL: load_v4f32_a4:
+; CHECK-NEXT: .param i32{{$}}
+; CHECK-NEXT: .result v128{{$}}
+; CHECK-NEXT: v128.load $push[[R:[0-9]+]]=, 0($0):p2align=2{{$}}
+; CHECK-NEXT: return $pop[[R]]{{$}}
+define <4 x float> @load_v4f32_a4(<4 x float> *%p) {
+  %v = load <4 x float>, <4 x float>* %p, align 4
+  ret <4 x float> %v
+}
+
+; 4 is the default alignment for v128 so no attribute is needed.
+
+; CHECK-LABEL: load_v4f32_a16:
+; CHECK-NEXT: .param i32{{$}}
+; CHECK-NEXT: .result v128{{$}}
+; CHECK-NEXT: v128.load $push[[R:[0-9]+]]=, 0($0){{$}}
+; CHECK-NEXT: return $pop[[R]]{{$}}
+define <4 x float> @load_v4f32_a16(<4 x float> *%p) {
+  %v = load <4 x float>, <4 x float>* %p, align 16
+  ret <4 x float> %v
+}
+
+; 32 is greater than the default alignment so it is ignored.
+
+; CHECK-LABEL: load_v4f32_a32:
+; CHECK-NEXT: .param i32{{$}}
+; CHECK-NEXT: .result v128{{$}}
+; CHECK-NEXT: v128.load $push[[R:[0-9]+]]=, 0($0){{$}}
+; CHECK-NEXT: return $pop[[R]]{{$}}
+define <4 x float> @load_v4f32_a32(<4 x float> *%p) {
+  %v = load <4 x float>, <4 x float>* %p, align 32
+  ret <4 x float> %v
+}
+
+; CHECK-LABEL: store_v4f32_a1:
+; CHECK-NEXT: .param i32, v128{{$}}
+; CHECK-NEXT: v128.store 0($0):p2align=0, $1{{$}}
+; CHECK-NEXT: return{{$}}
+define void @store_v4f32_a1(<4 x float> *%p, <4 x float> %v) {
+  store <4 x float> %v, <4 x float>* %p, align 1
+  ret void
+}
+
+; CHECK-LABEL: store_v4f32_a4:
+; CHECK-NEXT: .param i32, v128{{$}}
+; CHECK-NEXT: v128.store 0($0):p2align=2, $1{{$}}
+; CHECK-NEXT: return{{$}}
+define void @store_v4f32_a4(<4 x float> *%p, <4 x float> %v) {
+  store <4 x float> %v, <4 x float>* %p, align 4
+  ret void
+}
+
+; 16 is the default alignment for v128 so no attribute is needed.
+
+; CHECK-LABEL: store_v4f32_a16:
+; CHECK-NEXT: .param i32, v128{{$}}
+; CHECK-NEXT: v128.store 0($0), $1{{$}}
+; CHECK-NEXT: return{{$}}
+define void @store_v4f32_a16(<4 x float> *%p, <4 x float> %v) {
+  store <4 x float> %v, <4 x float>* %p, align 16
+  ret void
+}
+
+; 32 is greater than the default alignment so it is ignored.
+
+; CHECK-LABEL: store_v4f32_a32:
+; CHECK-NEXT: .param i32, v128{{$}}
+; CHECK-NEXT: v128.store 0($0), $1{{$}}
+; CHECK-NEXT: return{{$}}
+define void @store_v4f32_a32(<4 x float> *%p, <4 x float> %v) {
+  store <4 x float> %v, <4 x float>* %p, align 32
+  ret void
+}
+
+; ==============================================================================
+; 2 x double
+; ==============================================================================
+
+; CHECK-LABEL: load_v2f64_a1:
+; CHECK-NEXT: .param i32{{$}}
+; CHECK-NEXT: .result v128{{$}}
+; CHECK-NEXT: v128.load $push[[R:[0-9]+]]=, 0($0):p2align=0{{$}}
+; CHECK-NEXT: return $pop[[R]]{{$}}
+define <2 x double> @load_v2f64_a1(<2 x double> *%p) {
+  %v = load <2 x double>, <2 x double>* %p, align 1
+  ret <2 x double> %v
+}
+
+; CHECK-LABEL: load_v2f64_a4:
+; CHECK-NEXT: .param i32{{$}}
+; CHECK-NEXT: .result v128{{$}}
+; CHECK-NEXT: v128.load $push[[R:[0-9]+]]=, 0($0):p2align=2{{$}}
+; CHECK-NEXT: return $pop[[R]]{{$}}
+define <2 x double> @load_v2f64_a4(<2 x double> *%p) {
+  %v = load <2 x double>, <2 x double>* %p, align 4
+  ret <2 x double> %v
+}
+
+; 2 is the default alignment for v128 so no attribute is needed.
+
+; CHECK-LABEL: load_v2f64_a16:
+; CHECK-NEXT: .param i32{{$}}
+; CHECK-NEXT: .result v128{{$}}
+; CHECK-NEXT: v128.load $push[[R:[0-9]+]]=, 0($0){{$}}
+; CHECK-NEXT: return $pop[[R]]{{$}}
+define <2 x double> @load_v2f64_a16(<2 x double> *%p) {
+  %v = load <2 x double>, <2 x double>* %p, align 16
+  ret <2 x double> %v
+}
+
+; 32 is greater than the default alignment so it is ignored.
+
+; CHECK-LABEL: load_v2f64_a32:
+; CHECK-NEXT: .param i32{{$}}
+; CHECK-NEXT: .result v128{{$}}
+; CHECK-NEXT: v128.load $push[[R:[0-9]+]]=, 0($0){{$}}
+; CHECK-NEXT: return $pop[[R]]{{$}}
+define <2 x double> @load_v2f64_a32(<2 x double> *%p) {
+  %v = load <2 x double>, <2 x double>* %p, align 32
+  ret <2 x double> %v
+}
+
+; CHECK-LABEL: store_v2f64_a1:
+; CHECK-NEXT: .param i32, v128{{$}}
+; CHECK-NEXT: v128.store 0($0):p2align=0, $1{{$}}
+; CHECK-NEXT: return{{$}}
+define void @store_v2f64_a1(<2 x double> *%p, <2 x double> %v) {
+  store <2 x double> %v, <2 x double>* %p, align 1
+  ret void
+}
+
+; CHECK-LABEL: store_v2f64_a4:
+; CHECK-NEXT: .param i32, v128{{$}}
+; CHECK-NEXT: v128.store 0($0):p2align=2, $1{{$}}
+; CHECK-NEXT: return{{$}}
+define void @store_v2f64_a4(<2 x double> *%p, <2 x double> %v) {
+  store <2 x double> %v, <2 x double>* %p, align 4
+  ret void
+}
+
+; 16 is the default alignment for v128 so no attribute is needed.
+
+; CHECK-LABEL: store_v2f64_a16:
+; CHECK-NEXT: .param i32, v128{{$}}
+; CHECK-NEXT: v128.store 0($0), $1{{$}}
+; CHECK-NEXT: return{{$}}
+define void @store_v2f64_a16(<2 x double> *%p, <2 x double> %v) {
+  store <2 x double> %v, <2 x double>* %p, align 16
+  ret void
+}
+
+; 32 is greater than the default alignment so it is ignored.
+
+; CHECK-LABEL: store_v2f64_a32:
+; CHECK-NEXT: .param i32, v128{{$}}
+; CHECK-NEXT: v128.store 0($0), $1{{$}}
+; CHECK-NEXT: return{{$}}
+define void @store_v2f64_a32(<2 x double> *%p, <2 x double> %v) {
+  store <2 x double> %v, <2 x double>* %p, align 32
+  ret void
+}