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| ; RUN: opt < %s -instcombine -S | FileCheck %s
;
; Make sure the llvm.access.group meta-data is preserved
; when a memcpy is replaced with a load+store by instcombine
;
; #include <string.h>
; void test(char* out, long size)
; {
; #pragma clang loop vectorize(assume_safety)
; for (long i = 0; i < size; i+=2) {
; memcpy(&(out[i]), &(out[i+size]), 2);
; }
; }
; CHECK: for.body:
; CHECK: %{{.*}} = load i16, i16* %{{.*}}, align 1, !llvm.access.group !1
; CHECK: store i16 %{{.*}}, i16* %{{.*}}, align 1, !llvm.access.group !1
; ModuleID = '<stdin>'
source_filename = "memcpy.pragma.cpp"
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
; Function Attrs: nounwind uwtable
define void @_Z4testPcl(i8* %out, i64 %size) #0 {
entry:
br label %for.cond
for.cond: ; preds = %for.inc, %entry
%i.0 = phi i64 [ 0, %entry ], [ %add2, %for.inc ]
%cmp = icmp slt i64 %i.0, %size
br i1 %cmp, label %for.body, label %for.end
for.body: ; preds = %for.cond
%arrayidx = getelementptr inbounds i8, i8* %out, i64 %i.0
%add = add nsw i64 %i.0, %size
%arrayidx1 = getelementptr inbounds i8, i8* %out, i64 %add
call void @llvm.memcpy.p0i8.p0i8.i64(i8* %arrayidx, i8* %arrayidx1, i64 2, i1 false), !llvm.access.group !4
br label %for.inc
for.inc: ; preds = %for.body
%add2 = add nsw i64 %i.0, 2
br label %for.cond, !llvm.loop !2
for.end: ; preds = %for.cond
ret void
}
; Function Attrs: argmemonly nounwind
declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture writeonly, i8* nocapture readonly, i64, i1) #1
attributes #0 = { nounwind uwtable "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+fxsr,+mmx,+sse,+sse2,+x87" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #1 = { argmemonly nounwind }
!llvm.ident = !{!0}
!0 = !{!"clang version 4.0.0 (cfe/trunk 277751)"}
!1 = distinct !{!1, !2, !3, !{!"llvm.loop.parallel_accesses", !4}}
!2 = distinct !{!2, !3}
!3 = !{!"llvm.loop.vectorize.enable", i1 true}
!4 = distinct !{} ; access group
|