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