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62 lines
2.4 KiB
LLVM
62 lines
2.4 KiB
LLVM
; RUN: opt < %s -instcombine -S | FileCheck %s
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;
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; Make sure the llvm.mem.parallel_loop_access meta-data is preserved
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; when a memcpy is replaced with a load+store by instcombine
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;
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; #include <string.h>
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; void test(char* out, long size)
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; {
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; #pragma clang loop vectorize(assume_safety)
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; for (long i = 0; i < size; i+=2) {
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; memcpy(&(out[i]), &(out[i+size]), 2);
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; }
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; }
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; CHECK: for.body:
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; CHECK: %{{.*}} = load i16, i16* %{{.*}}, align 1, !llvm.mem.parallel_loop_access !1
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; CHECK: store i16 %{{.*}}, i16* %{{.*}}, align 1, !llvm.mem.parallel_loop_access !1
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; ModuleID = '<stdin>'
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source_filename = "memcpy.pragma.cpp"
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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; Function Attrs: nounwind uwtable
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define void @_Z4testPcl(i8* %out, i64 %size) #0 {
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entry:
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br label %for.cond
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for.cond: ; preds = %for.inc, %entry
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%i.0 = phi i64 [ 0, %entry ], [ %add2, %for.inc ]
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%cmp = icmp slt i64 %i.0, %size
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br i1 %cmp, label %for.body, label %for.end
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for.body: ; preds = %for.cond
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%arrayidx = getelementptr inbounds i8, i8* %out, i64 %i.0
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%add = add nsw i64 %i.0, %size
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%arrayidx1 = getelementptr inbounds i8, i8* %out, i64 %add
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call void @llvm.memcpy.p0i8.p0i8.i64(i8* %arrayidx, i8* %arrayidx1, i64 2, i32 1, i1 false), !llvm.mem.parallel_loop_access !1
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br label %for.inc
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for.inc: ; preds = %for.body
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%add2 = add nsw i64 %i.0, 2
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br label %for.cond, !llvm.loop !2
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for.end: ; preds = %for.cond
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ret void
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}
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; Function Attrs: argmemonly nounwind
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declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture writeonly, i8* nocapture readonly, i64, i32, i1) #1
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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" }
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attributes #1 = { argmemonly nounwind }
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!llvm.ident = !{!0}
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!0 = !{!"clang version 4.0.0 (cfe/trunk 277751)"}
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!1 = distinct !{!1, !2, !3}
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!2 = distinct !{!2, !3}
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!3 = !{!"llvm.loop.vectorize.enable", i1 true}
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