| Yi Kong | 2355066 | 2014-07-17 10:50:20 +0000 | [diff] [blame^] | 1 | ; RUN: llc < %s -mtriple=aarch64-eabi -O=3 | FileCheck %s |
| 2 | |
| 3 | define void @test() { |
| 4 | ; CHECK: dmb sy |
| 5 | call void @llvm.aarch64.dmb(i32 15) |
| 6 | ; CHECK: dmb osh |
| 7 | call void @llvm.aarch64.dmb(i32 3) |
| 8 | ; CHECK: dsb sy |
| 9 | call void @llvm.aarch64.dsb(i32 15) |
| 10 | ; CHECK: dsb ishld |
| 11 | call void @llvm.aarch64.dsb(i32 9) |
| 12 | ; CHECK: isb |
| 13 | call void @llvm.aarch64.isb(i32 15) |
| 14 | ret void |
| 15 | } |
| 16 | |
| 17 | ; Important point is that the compiler should not reorder memory access |
| 18 | ; instructions around DMB. |
| 19 | ; Failure to do so, two STRs will collapse into one STP. |
| 20 | define void @test_dmb_reordering(i32 %a, i32 %b, i32* %d) { |
| 21 | store i32 %a, i32* %d ; CHECK: str {{w[0-9]+}}, [{{x[0-9]+}}] |
| 22 | |
| 23 | call void @llvm.aarch64.dmb(i32 15); CHECK: dmb sy |
| 24 | |
| 25 | %d1 = getelementptr i32* %d, i64 1 |
| 26 | store i32 %b, i32* %d1 ; CHECK: str {{w[0-9]+}}, [{{x[0-9]+}}, #4] |
| 27 | |
| 28 | ret void |
| 29 | } |
| 30 | |
| 31 | ; Similarly for DSB. |
| 32 | define void @test_dsb_reordering(i32 %a, i32 %b, i32* %d) { |
| 33 | store i32 %a, i32* %d ; CHECK: str {{w[0-9]+}}, [{{x[0-9]+}}] |
| 34 | |
| 35 | call void @llvm.aarch64.dsb(i32 15); CHECK: dsb sy |
| 36 | |
| 37 | %d1 = getelementptr i32* %d, i64 1 |
| 38 | store i32 %b, i32* %d1 ; CHECK: str {{w[0-9]+}}, [{{x[0-9]+}}, #4] |
| 39 | |
| 40 | ret void |
| 41 | } |
| 42 | |
| 43 | ; And ISB. |
| 44 | define void @test_isb_reordering(i32 %a, i32 %b, i32* %d) { |
| 45 | store i32 %a, i32* %d ; CHECK: str {{w[0-9]+}}, [{{x[0-9]+}}] |
| 46 | |
| 47 | call void @llvm.aarch64.isb(i32 15); CHECK: isb |
| 48 | |
| 49 | %d1 = getelementptr i32* %d, i64 1 |
| 50 | store i32 %b, i32* %d1 ; CHECK: str {{w[0-9]+}}, [{{x[0-9]+}}, #4] |
| 51 | |
| 52 | ret void |
| 53 | } |
| 54 | |
| 55 | declare void @llvm.aarch64.dmb(i32) |
| 56 | declare void @llvm.aarch64.dsb(i32) |
| 57 | declare void @llvm.aarch64.isb(i32) |