1 ; RUN: opt < %s -loop-vectorize -force-vector-unroll=1 -force-vector-width=4 -dce -instcombine -S -enable-if-conversion | FileCheck %s 2 3 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-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128" 4 target triple = "x86_64-apple-macosx10.9.0" 5 6 ; This is kernel11 from "LivermoreLoops". We can't vectorize it because we 7 ; access both x[k] and x[k-1]. 8 ; 9 ; void kernel11(double *x, double *y, int n) { 10 ; for ( int k=1 ; k<n ; k++ ) 11 ; x[k] = x[k-1] + y[k]; 12 ; } 13 14 ; CHECK-LABEL: @kernel11( 15 ; CHECK-NOT: <4 x double> 16 ; CHECK: ret 17 define i32 @kernel11(double* %x, double* %y, i32 %n) nounwind uwtable ssp { 18 %1 = alloca double*, align 8 19 %2 = alloca double*, align 8 20 %3 = alloca i32, align 4 21 %k = alloca i32, align 4 22 store double* %x, double** %1, align 8 23 store double* %y, double** %2, align 8 24 store i32 %n, i32* %3, align 4 25 store i32 1, i32* %k, align 4 26 br label %4 27 28 ; <label>:4 ; preds = %25, %0 29 %5 = load i32* %k, align 4 30 %6 = load i32* %3, align 4 31 %7 = icmp slt i32 %5, %6 32 br i1 %7, label %8, label %28 33 34 ; <label>:8 ; preds = %4 35 %9 = load i32* %k, align 4 36 %10 = sub nsw i32 %9, 1 37 %11 = sext i32 %10 to i64 38 %12 = load double** %1, align 8 39 %13 = getelementptr inbounds double* %12, i64 %11 40 %14 = load double* %13, align 8 41 %15 = load i32* %k, align 4 42 %16 = sext i32 %15 to i64 43 %17 = load double** %2, align 8 44 %18 = getelementptr inbounds double* %17, i64 %16 45 %19 = load double* %18, align 8 46 %20 = fadd double %14, %19 47 %21 = load i32* %k, align 4 48 %22 = sext i32 %21 to i64 49 %23 = load double** %1, align 8 50 %24 = getelementptr inbounds double* %23, i64 %22 51 store double %20, double* %24, align 8 52 br label %25 53 54 ; <label>:25 ; preds = %8 55 %26 = load i32* %k, align 4 56 %27 = add nsw i32 %26, 1 57 store i32 %27, i32* %k, align 4 58 br label %4 59 60 ; <label>:28 ; preds = %4 61 ret i32 0 62 } 63 64 65 66 ; We don't vectorize this function because A[i*7] is scalarized, and the 67 ; different scalars can in theory wrap around and overwrite other scalar 68 ; elements. At the moment we only allow read/write access to arrays 69 ; that are consecutive. 70 ; 71 ; void foo(int *a) { 72 ; for (int i=0; i<256; ++i) { 73 ; int x = a[i*7]; 74 ; if (x>3) 75 ; x = x*x+x*4; 76 ; a[i*7] = x+3; 77 ; } 78 ; } 79 80 ; CHECK-LABEL: @func2( 81 ; CHECK-NOT: <4 x i32> 82 ; CHECK: ret 83 define i32 @func2(i32* nocapture %a) nounwind uwtable ssp { 84 br label %1 85 86 ; <label>:1 ; preds = %7, %0 87 %indvars.iv = phi i64 [ 0, %0 ], [ %indvars.iv.next, %7 ] 88 %2 = mul nsw i64 %indvars.iv, 7 89 %3 = getelementptr inbounds i32* %a, i64 %2 90 %4 = load i32* %3, align 4 91 %5 = icmp sgt i32 %4, 3 92 br i1 %5, label %6, label %7 93 94 ; <label>:6 ; preds = %1 95 %tmp = add i32 %4, 4 96 %tmp1 = mul i32 %tmp, %4 97 br label %7 98 99 ; <label>:7 ; preds = %6, %1 100 %x.0 = phi i32 [ %tmp1, %6 ], [ %4, %1 ] 101 %8 = add nsw i32 %x.0, 3 102 store i32 %8, i32* %3, align 4 103 %indvars.iv.next = add i64 %indvars.iv, 1 104 %lftr.wideiv = trunc i64 %indvars.iv.next to i32 105 %exitcond = icmp eq i32 %lftr.wideiv, 256 106 br i1 %exitcond, label %9, label %1 107 108 ; <label>:9 ; preds = %7 109 ret i32 0 110 } 111
