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- ; RUN: opt < %s -loop-vectorize -force-vector-interleave=1 -force-vector-width=4 -dce -instcombine -S -enable-if-conversion | FileCheck %s
- 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"
- target triple = "x86_64-apple-macosx10.9.0"
- ; This is kernel11 from "LivermoreLoops". We can't vectorize it because we
- ; access both x[k] and x[k-1].
- ;
- ; void kernel11(double *x, double *y, int n) {
- ; for ( int k=1 ; k<n ; k++ )
- ; x[k] = x[k-1] + y[k];
- ; }
- ; CHECK-LABEL: @kernel11(
- ; CHECK-NOT: <4 x double>
- ; CHECK: ret
- define i32 @kernel11(double* %x, double* %y, i32 %n) nounwind uwtable ssp {
- %1 = alloca double*, align 8
- %2 = alloca double*, align 8
- %3 = alloca i32, align 4
- %k = alloca i32, align 4
- store double* %x, double** %1, align 8
- store double* %y, double** %2, align 8
- store i32 %n, i32* %3, align 4
- store i32 1, i32* %k, align 4
- br label %4
- ; <label>:4 ; preds = %25, %0
- %5 = load i32, i32* %k, align 4
- %6 = load i32, i32* %3, align 4
- %7 = icmp slt i32 %5, %6
- br i1 %7, label %8, label %28
- ; <label>:8 ; preds = %4
- %9 = load i32, i32* %k, align 4
- %10 = sub nsw i32 %9, 1
- %11 = sext i32 %10 to i64
- %12 = load double*, double** %1, align 8
- %13 = getelementptr inbounds double, double* %12, i64 %11
- %14 = load double, double* %13, align 8
- %15 = load i32, i32* %k, align 4
- %16 = sext i32 %15 to i64
- %17 = load double*, double** %2, align 8
- %18 = getelementptr inbounds double, double* %17, i64 %16
- %19 = load double, double* %18, align 8
- %20 = fadd double %14, %19
- %21 = load i32, i32* %k, align 4
- %22 = sext i32 %21 to i64
- %23 = load double*, double** %1, align 8
- %24 = getelementptr inbounds double, double* %23, i64 %22
- store double %20, double* %24, align 8
- br label %25
- ; <label>:25 ; preds = %8
- %26 = load i32, i32* %k, align 4
- %27 = add nsw i32 %26, 1
- store i32 %27, i32* %k, align 4
- br label %4
- ; <label>:28 ; preds = %4
- ret i32 0
- }
- ; We don't vectorize this function because A[i*7] is scalarized, and the
- ; different scalars can in theory wrap around and overwrite other scalar
- ; elements. At the moment we only allow read/write access to arrays
- ; that are consecutive.
- ;
- ; void foo(int *a) {
- ; for (int i=0; i<256; ++i) {
- ; int x = a[i*7];
- ; if (x>3)
- ; x = x*x+x*4;
- ; a[i*7] = x+3;
- ; }
- ; }
- ; CHECK-LABEL: @func2(
- ; CHECK-NOT: <4 x i32>
- ; CHECK: ret
- define i32 @func2(i32* nocapture %a) nounwind uwtable ssp {
- br label %1
- ; <label>:1 ; preds = %7, %0
- %indvars.iv = phi i64 [ 0, %0 ], [ %indvars.iv.next, %7 ]
- %2 = mul nsw i64 %indvars.iv, 7
- %3 = getelementptr inbounds i32, i32* %a, i64 %2
- %4 = load i32, i32* %3, align 4
- %5 = icmp sgt i32 %4, 3
- br i1 %5, label %6, label %7
- ; <label>:6 ; preds = %1
- %tmp = add i32 %4, 4
- %tmp1 = mul i32 %tmp, %4
- br label %7
- ; <label>:7 ; preds = %6, %1
- %x.0 = phi i32 [ %tmp1, %6 ], [ %4, %1 ]
- %8 = add nsw i32 %x.0, 3
- store i32 %8, i32* %3, align 4
- %indvars.iv.next = add i64 %indvars.iv, 1
- %lftr.wideiv = trunc i64 %indvars.iv.next to i32
- %exitcond = icmp eq i32 %lftr.wideiv, 256
- br i1 %exitcond, label %9, label %1
- ; <label>:9 ; preds = %7
- ret i32 0
- }
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