49 lines
1.5 KiB
LLVM
49 lines
1.5 KiB
LLVM
; RUN: opt -basic-aa -loop-accesses -analyze -enable-new-pm=0 < %s | FileCheck %s
|
|
; RUN: opt -passes='require<scalar-evolution>,require<aa>,loop(print-access-info)' -disable-output < %s 2>&1 | FileCheck %s
|
|
|
|
; In:
|
|
;
|
|
; store_ptr = A;
|
|
; load_ptr = &A[2];
|
|
; for (i = 0; i < n; i++)
|
|
; *store_ptr++ = *load_ptr++ *10; // A[i] = A[i+2] * 10
|
|
;
|
|
; make sure, we look through the PHI to conclude that store_ptr and load_ptr
|
|
; both have A as their underlying object. The dependence is safe for
|
|
; vectorization requiring no memchecks.
|
|
;
|
|
; Otherwise we would try to prove independence with a memcheck that is going
|
|
; to always fail.
|
|
|
|
target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
|
|
target triple = "x86_64-apple-macosx10.10.0"
|
|
|
|
; CHECK: Memory dependences are safe{{$}}
|
|
|
|
define void @f(i8* noalias %A, i64 %width) {
|
|
for.body.preheader:
|
|
%A_ahead = getelementptr inbounds i8, i8* %A, i64 2
|
|
br label %for.body
|
|
|
|
for.body:
|
|
%i = phi i64 [ %i.1, %for.body ], [ 0, %for.body.preheader ]
|
|
%load_ptr = phi i8* [ %load_ptr.1, %for.body ], [ %A_ahead, %for.body.preheader ]
|
|
%store_ptr = phi i8* [ %store_ptr.1, %for.body ], [ %A, %for.body.preheader ]
|
|
|
|
%loadA = load i8, i8* %load_ptr, align 1
|
|
|
|
%mul = mul i8 %loadA, 10
|
|
|
|
store i8 %mul, i8* %store_ptr, align 1
|
|
|
|
%load_ptr.1 = getelementptr inbounds i8, i8* %load_ptr, i64 1
|
|
%store_ptr.1 = getelementptr inbounds i8, i8* %store_ptr, i64 1
|
|
%i.1 = add nuw i64 %i, 1
|
|
|
|
%exitcond = icmp eq i64 %i.1, %width
|
|
br i1 %exitcond, label %for.end, label %for.body
|
|
|
|
for.end:
|
|
ret void
|
|
}
|