This commit enables unaligned memory accesses of vector types on AArch64 back end. This should boost vectorized code performance.

Patched by Z. Zheng



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@206557 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 172 insertions, 0 deletions

diff --git a/test/CodeGen/AArch64/unaligned-vector-ld1-st1.ll b/test/CodeGen/AArch64/unaligned-vector-ld1-st1.ll
new file mode 100644
index 0000000000..2e3f7bff02
--- /dev/null
+++ b/test/CodeGen/AArch64/unaligned-vector-ld1-st1.ll
@@ -0,0 +1,172 @@
+; RUN: llc < %s -mtriple=aarch64-none-linux-gnu -mattr=+neon -o - | FileCheck %s
+; RUN: llc < %s -mtriple=aarch64_be-none-linux-gnu -mattr=+neon -o - | FileCheck %s
+; RUN: llc < %s -mtriple=aarch64-none-linux-gnu -aarch64-no-strict-align -mattr=+neon -o - | FileCheck %s
+; RUN: llc < %s -mtriple=aarch64_be-none-linux-gnu -aarch64-no-strict-align -mattr=+neon -o - | FileCheck %s
+; RUN: llc < %s -mtriple=aarch64-none-linux-gnu -aarch64-strict-align -mattr=+neon -o - | FileCheck %s
+; RUN: llc < %s -mtriple=aarch64_be-none-linux-gnu -aarch64-strict-align -mattr=+neon -o - | FileCheck %s --check-prefix=BE-STRICT-ALIGN
+
+;; Check element-aligned 128-bit vector load/store - integer
+define <16 x i8> @qwordint (<16 x i8>* %head.v16i8,   <8 x i16>* %head.v8i16,   <4 x i32>* %head.v4i32, <2 x i64>* %head.v2i64,
+                            <16 x i8>* %tail.v16i8,   <8 x i16>* %tail.v8i16,   <4 x i32>* %tail.v4i32, <2 x i64>* %tail.v2i64) {
+; CHECK-LABEL: qwordint
+; CHECK: ld1     {v0.16b}, [x0]
+; CHECK: ld1     {v1.8h}, [x1]
+; CHECK: ld1     {v2.4s}, [x2]
+; CHECK: ld1     {v3.2d}, [x3]
+; CHECK: st1     {v0.16b}, [x4]
+; CHECK: st1     {v1.8h}, [x5]
+; CHECK: st1     {v2.4s}, [x6]
+; CHECK: st1     {v3.2d}, [x7]
+; BE-STRICT-ALIGN-LABEL: qwordint
+; BE-STRICT-ALIGN: ldrb
+; BE-STRICT-ALIGN: ldrh
+; BE-STRICT-ALIGN: ldr
+; BE-STRICT-ALIGN: ldr
+; BE-STRICT-ALIGN: strb
+; BE-STRICT-ALIGN: strh
+; BE-STRICT-ALIGN: str
+; BE-STRICT-ALIGN: str
+entry:
+  %val.v16i8 = load <16 x i8>* %head.v16i8, align 1
+  %val.v8i16 = load <8 x i16>* %head.v8i16, align 2
+  %val.v4i32 = load <4 x i32>* %head.v4i32, align 4
+  %val.v2i64 = load <2 x i64>* %head.v2i64, align 8
+  store <16 x i8> %val.v16i8, <16 x i8>* %tail.v16i8, align 1
+  store <8 x i16> %val.v8i16, <8 x i16>* %tail.v8i16, align 2
+  store <4 x i32> %val.v4i32, <4 x i32>* %tail.v4i32, align 4
+  store <2 x i64> %val.v2i64, <2 x i64>* %tail.v2i64, align 8
+  ret <16 x i8> %val.v16i8
+}
+
+;; Check element-aligned 128-bit vector load/store - floating point
+define <4 x float> @qwordfloat (<4 x float>* %head.v4f32,   <2 x double>* %head.v2f64,
+                                <4 x float>* %tail.v4f32,   <2 x double>* %tail.v2f64) {
+; CHECK-LABEL: qwordfloat
+; CHECK: ld1     {v0.4s}, [x0]
+; CHECK: ld1     {v1.2d}, [x1]
+; CHECK: st1     {v0.4s}, [x2]
+; CHECK: st1     {v1.2d}, [x3]
+; BE-STRICT-ALIGN-LABEL: qwordfloat
+; BE-STRICT-ALIGN: ldr
+; BE-STRICT-ALIGN: ldr
+; BE-STRICT-ALIGN: str
+; BE-STRICT-ALIGN: str
+entry:
+  %val.v4f32 = load <4 x float>*  %head.v4f32, align 4
+  %val.v2f64 = load <2 x double>* %head.v2f64, align 8
+  store <4 x float>  %val.v4f32, <4 x float>*  %tail.v4f32, align 4
+  store <2 x double> %val.v2f64, <2 x double>* %tail.v2f64, align 8
+  ret <4 x float> %val.v4f32
+}
+
+;; Check element-aligned 64-bit vector load/store - integer
+define <8 x i8> @dwordint (<8 x i8>* %head.v8i8,   <4 x i16>* %head.v4i16,   <2 x i32>* %head.v2i32, <1 x i64>* %head.v1i64,
+                           <8 x i8>* %tail.v8i8,   <4 x i16>* %tail.v4i16,   <2 x i32>* %tail.v2i32, <1 x i64>* %tail.v1i64) {
+; CHECK-LABEL: dwordint
+; CHECK: ld1     {v0.8b}, [x0]
+; CHECK: ld1     {v1.4h}, [x1]
+; CHECK: ld1     {v2.2s}, [x2]
+; CHECK: ld1     {v3.1d}, [x3]
+; CHECK: st1     {v0.8b}, [x4]
+; CHECK: st1     {v1.4h}, [x5]
+; CHECK: st1     {v2.2s}, [x6]
+; CHECK: st1     {v3.1d}, [x7]
+; BE-STRICT-ALIGN-LABEL: dwordint
+; BE-STRICT-ALIGN: ldrb
+; BE-STRICT-ALIGN: ldrh
+; BE-STRICT-ALIGN: ldr
+; BE-STRICT-ALIGN: ld1     {v1.1d}, [x3]
+; BE-STRICT-ALIGN: strb
+; BE-STRICT-ALIGN: strh
+; BE-STRICT-ALIGN: str
+; BE-STRICT-ALIGN: st1     {v1.1d}, [x7]
+entry:
+  %val.v8i8  = load <8 x i8>*  %head.v8i8,  align 1
+  %val.v4i16 = load <4 x i16>* %head.v4i16, align 2
+  %val.v2i32 = load <2 x i32>* %head.v2i32, align 4
+  %val.v1i64 = load <1 x i64>* %head.v1i64, align 8
+  store <8 x i8>  %val.v8i8,  <8 x i8>*  %tail.v8i8 , align 1
+  store <4 x i16> %val.v4i16, <4 x i16>* %tail.v4i16, align 2
+  store <2 x i32> %val.v2i32, <2 x i32>* %tail.v2i32, align 4
+  store <1 x i64> %val.v1i64, <1 x i64>* %tail.v1i64, align 8
+  ret <8 x i8> %val.v8i8
+}
+
+;; Check element-aligned 64-bit vector load/store - floating point
+define <2 x float> @dwordfloat (<2 x float>* %head.v2f32,   <1 x double>* %head.v1f64,
+                                <2 x float>* %tail.v2f32,   <1 x double>* %tail.v1f64) {
+; CHECK-LABEL: dwordfloat
+; CHECK: ld1     {v0.2s}, [x0]
+; CHECK: ld1     {v1.1d}, [x1]
+; CHECK: st1     {v0.2s}, [x2]
+; CHECK: st1     {v1.1d}, [x3]
+; BE-STRICT-ALIGN-LABEL: dwordfloat
+; BE-STRICT-ALIGN: ldr
+; BE-STRICT-ALIGN: ld1     {v1.1d}, [x1]
+; BE-STRICT-ALIGN: str
+; BE-STRICT-ALIGN: st1     {v1.1d}, [x3]
+entry:
+  %val.v2f32 = load <2 x float>*  %head.v2f32, align 4
+  %val.v1f64 = load <1 x double>* %head.v1f64, align 8
+  store <2 x float>  %val.v2f32, <2 x float>* %tail.v2f32, align 4
+  store <1 x double> %val.v1f64, <1 x double>* %tail.v1f64, align 8
+  ret <2 x float> %val.v2f32
+}
+
+;; Check load/store of 128-bit vectors with less-than 16-byte alignment
+define <2 x i64> @align2vi64 (<2 x i64>* %head.byte, <2 x i64>* %head.half, <2 x i64>* %head.word, <2 x i64>* %head.dword,
+                              <2 x i64>* %tail.byte, <2 x i64>* %tail.half, <2 x i64>* %tail.word, <2 x i64>* %tail.dword) {
+; CHECK-LABEL: align2vi64
+; CHECK: ld1     {v0.2d}, [x0]
+; CHECK: ld1     {v1.2d}, [x1]
+; CHECK: ld1     {v2.2d}, [x2]
+; CHECK: ld1     {v3.2d}, [x3]
+; CHECK: st1     {v0.2d}, [x4]
+; CHECK: st1     {v1.2d}, [x5]
+; CHECK: st1     {v2.2d}, [x6]
+; CHECK: st1     {v3.2d}, [x7]
+; BE-STRICT-ALIGN-LABEL: align2vi64
+; BE-STRICT-ALIGN: ldrb     
+; BE-STRICT-ALIGN: ldrh     
+; BE-STRICT-ALIGN: ldr
+; BE-STRICT-ALIGN: strb     
+; BE-STRICT-ALIGN: strh     
+; BE-STRICT-ALIGN: str
+entry:
+  %val.byte  = load <2 x i64>* %head.byte,  align 1
+  %val.half  = load <2 x i64>* %head.half,  align 2
+  %val.word  = load <2 x i64>* %head.word,  align 4
+  %val.dword = load <2 x i64>* %head.dword, align 8
+  store <2 x i64> %val.byte,  <2 x i64>* %tail.byte,  align 1
+  store <2 x i64> %val.half,  <2 x i64>* %tail.half,  align 2
+  store <2 x i64> %val.word,  <2 x i64>* %tail.word,  align 4
+  store <2 x i64> %val.dword, <2 x i64>* %tail.dword, align 8
+  ret <2 x i64> %val.byte
+}
+
+;; Check load/store of 64-bit vectors with less-than 8-byte alignment
+define <2 x float> @align2vf32 (<2 x float>* %head.byte, <2 x float>* %head.half, <2 x float>* %head.word, <2 x float>* %head.dword,
+                                <2 x float>* %tail.byte, <2 x float>* %tail.half, <2 x float>* %tail.word, <2 x float>* %tail.dword) {
+; CHECK-LABEL: align2vf32
+; CHECK: ld1     {v0.2s}, [x0]
+; CHECK: ld1     {v1.2s}, [x1]
+; CHECK: ld1     {v2.2s}, [x2]
+; CHECK: st1     {v0.2s}, [x4]
+; CHECK: st1     {v1.2s}, [x5]
+; CHECK: st1     {v2.2s}, [x6]
+; BE-STRICT-ALIGN-LABEL: align2vf32
+; BE-STRICT-ALIGN: ldrb 
+; BE-STRICT-ALIGN: ldrh    
+; BE-STRICT-ALIGN: ldr
+; BE-STRICT-ALIGN: strb    
+; BE-STRICT-ALIGN: strh    
+; BE-STRICT-ALIGN: str
+entry:
+  %val.byte  = load <2 x float>* %head.byte,  align 1
+  %val.half  = load <2 x float>* %head.half,  align 2
+  %val.word  = load <2 x float>* %head.word,  align 4
+  store <2 x float> %val.byte,  <2 x float>* %tail.byte,  align 1
+  store <2 x float> %val.half,  <2 x float>* %tail.half,  align 2
+  store <2 x float> %val.word,  <2 x float>* %tail.word,  align 4
+  ret <2 x float> %val.byte
+}