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annotate test/Transforms/InstCombine/align-addr.ll @ 0:95c75e76d11b LLVM3.4

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LLVM 3.4
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Thu, 12 Dec 2013 13:56:28 +0900
parents
children afa8332a0e37
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95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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1 ; RUN: opt < %s -instcombine -S | FileCheck %s
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2 target datalayout = "E-p:64:64:64-p1:32:32:32-a0:0:8-f32:32:32-f64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-v64:64:64-v128:128:128"
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3
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4 ; Instcombine should be able to prove vector alignment in the
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5 ; presence of a few mild address computation tricks.
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6
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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7 ; CHECK-LABEL: @test0(
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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8 ; CHECK: align 16
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9
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10 define void @test0(i8* %b, i64 %n, i64 %u, i64 %y) nounwind {
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11 entry:
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12 %c = ptrtoint i8* %b to i64
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13 %d = and i64 %c, -16
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14 %e = inttoptr i64 %d to double*
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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15 %v = mul i64 %u, 2
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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16 %z = and i64 %y, -2
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17 %t1421 = icmp eq i64 %n, 0
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18 br i1 %t1421, label %return, label %bb
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19
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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20 bb:
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21 %i = phi i64 [ %indvar.next, %bb ], [ 20, %entry ]
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22 %j = mul i64 %i, %v
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23 %h = add i64 %j, %z
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24 %t8 = getelementptr double* %e, i64 %h
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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25 %p = bitcast double* %t8 to <2 x double>*
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26 store <2 x double><double 0.0, double 0.0>, <2 x double>* %p, align 8
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27 %indvar.next = add i64 %i, 1
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28 %exitcond = icmp eq i64 %indvar.next, %n
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29 br i1 %exitcond, label %return, label %bb
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30
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31 return:
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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32 ret void
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33 }
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34
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35 ; When we see a unaligned load from an insufficiently aligned global or
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36 ; alloca, increase the alignment of the load, turning it into an aligned load.
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37
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38 ; CHECK-LABEL: @test1(
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39 ; CHECK: tmp = load
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40 ; CHECK: GLOBAL{{.*}}align 16
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41
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42 @GLOBAL = internal global [4 x i32] zeroinitializer
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43
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44 define <16 x i8> @test1(<2 x i64> %x) {
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45 entry:
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46 %tmp = load <16 x i8>* bitcast ([4 x i32]* @GLOBAL to <16 x i8>*), align 1
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47 ret <16 x i8> %tmp
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48 }
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49
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50 @GLOBAL_as1 = internal addrspace(1) global [4 x i32] zeroinitializer
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51
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52 define <16 x i8> @test1_as1(<2 x i64> %x) {
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53 ; CHECK-LABEL: @test1_as1(
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54 ; CHECK: tmp = load
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55 ; CHECK: GLOBAL_as1{{.*}}align 16
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56 %tmp = load <16 x i8> addrspace(1)* bitcast ([4 x i32] addrspace(1)* @GLOBAL_as1 to <16 x i8> addrspace(1)*), align 1
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57 ret <16 x i8> %tmp
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58 }
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59
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60 @GLOBAL_as1_gep = internal addrspace(1) global [8 x i32] zeroinitializer
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61
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62 define <16 x i8> @test1_as1_gep(<2 x i64> %x) {
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63 ; CHECK-LABEL: @test1_as1_gep(
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64 ; CHECK: tmp = load
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65 ; CHECK: GLOBAL_as1_gep{{.*}}align 16
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66 %tmp = load <16 x i8> addrspace(1)* bitcast (i32 addrspace(1)* getelementptr ([8 x i32] addrspace(1)* @GLOBAL_as1_gep, i16 0, i16 4) to <16 x i8> addrspace(1)*), align 1
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67 ret <16 x i8> %tmp
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68 }
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69
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70
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71 ; When a load or store lacks an explicit alignment, add one.
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72
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73 ; CHECK-LABEL: @test2(
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74 ; CHECK: load double* %p, align 8
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75 ; CHECK: store double %n, double* %p, align 8
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76
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77 define double @test2(double* %p, double %n) nounwind {
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78 %t = load double* %p
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79 store double %n, double* %p
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80 ret double %t
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81 }
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82
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83 declare void @llvm.memset.p0i8.i64(i8* nocapture, i8, i64, i32, i1) nounwind
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84
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85 declare void @use(i8*)
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86
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87 %struct.s = type { i32, i32, i32, i32 }
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88
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89 define void @test3(%struct.s* sret %a4) {
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90 ; Check that the alignment is bumped up the alignment of the sret type.
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91 ; CHECK-LABEL: @test3(
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92 %a4.cast = bitcast %struct.s* %a4 to i8*
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93 call void @llvm.memset.p0i8.i64(i8* %a4.cast, i8 0, i64 16, i32 1, i1 false)
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94 ; CHECK: call void @llvm.memset.p0i8.i64(i8* %a4.cast, i8 0, i64 16, i32 4, i1 false)
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95 call void @use(i8* %a4.cast)
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96 ret void
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97 }