1 files changed, 62 insertions, 0 deletions
diff --git a/llvm/test/Transforms/InstCombine/mem-par-metadata-memcpy.ll b/llvm/test/Transforms/InstCombine/mem-par-metadata-memcpy.ll
new file mode 100644
index 00000000000..54fe6cb8495
--- /dev/null
+++ b/llvm/test/Transforms/InstCombine/mem-par-metadata-memcpy.ll
@@ -0,0 +1,62 @@
+; 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