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Differential D37507 Diff 115175 llvm/trunk/test/Transforms/LoopVectorize/memdep.ll

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llvm/trunk/test/Transforms/LoopVectorize/memdep.ll

; RUN: opt < %s -loop-vectorize -force-vector-width=2 -force-vector-interleave=1 -S | FileCheck %s ; RUN: opt < %s -loop-vectorize -force-vector-width=2 -force-vector-interleave=1 -S | FileCheck %s
; RUN: opt < %s -loop-vectorize -force-vector-width=4 -force-vector-interleave=1 -S | FileCheck %s -check-prefix=WIDTH ; RUN: opt < %s -loop-vectorize -force-vector-width=4 -force-vector-interleave=1 -S | FileCheck %s -check-prefix=WIDTH
; RUN: opt -S -loop-vectorize -force-vector-width=4 < %s | FileCheck %s -check-prefix=RIGHTVF
; RUN: opt -S -loop-vectorize -force-vector-width=8 < %s | FileCheck %s -check-prefix=WRONGVF
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 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"
; Vectorization with dependence checks. ; Vectorization with dependence checks.
; No plausible dependence - can be vectorized. ; No plausible dependence - can be vectorized.
; for (i = 0; i < 1024; ++i) ; for (i = 0; i < 1024; ++i)
; A[i] = A[i + 1] + 1; ; A[i] = A[i + 1] + 1;
▲ Show 20 Lines • Show All 204 Lines • ▼ Show 20 Linesfor.body:
%indvars.iv.next = add i64 %indvars.iv, 1 %indvars.iv.next = add i64 %indvars.iv, 1
%lftr.wideiv = trunc i64 %indvars.iv.next to i32 %lftr.wideiv = trunc i64 %indvars.iv.next to i32
%exitcond = icmp ne i32 %lftr.wideiv, 128 %exitcond = icmp ne i32 %lftr.wideiv, 128
br i1 %exitcond, label %for.body, label %for.end br i1 %exitcond, label %for.body, label %for.end
for.end: for.end:
ret void ret void
} }
;Check the new calculation of the maximum safe distance in bits which can be vectorized.
;The previous behavior did not take account that the stride was 2.
;Therefore the maxVF was computed as 8 instead of 4, as the dependence distance here is 6 iterations, given by |N-(N-12)|/2.
;#define M 32
;#define N 2 * M
;unsigned int a [N];
;void pr34283(){
; unsigned int j=0;
; for (j = 0; j < M - 6; ++j)
; {
; a[N - 2 * j] = 69;
; a[N - 12 - 2 * j] = 7;
; }
;
;}
; RIGHTVF-LABEL: @pr34283
; RIGHTVF: <4 x i64>
; WRONGVF-LABLE: @pr34283
; WRONGVF-NOT: <8 x i64>
@a = common local_unnamed_addr global [64 x i32] zeroinitializer, align 16
; Function Attrs: norecurse nounwind uwtable
define void @pr34283() local_unnamed_addr {
entry:
br label %for.body
for.body:
%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
%0 = shl i64 %indvars.iv, 1
%1 = sub nuw nsw i64 64, %0
%arrayidx = getelementptr inbounds [64 x i32], [64 x i32]* @a, i64 0, i64 %1
store i32 69, i32* %arrayidx, align 8
%2 = sub nuw nsw i64 52, %0
%arrayidx4 = getelementptr inbounds [64 x i32], [64 x i32]* @a, i64 0, i64 %2
store i32 7, i32* %arrayidx4, align 8
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
%exitcond = icmp eq i64 %indvars.iv.next, 26
br i1 %exitcond, label %for.end, label %for.body
for.end:
ret void
}