; NOTE: Assertions have been autogenerated by utils/update_test_checks.py ; RUN: opt -passes=loop-idiom < %s -S | FileCheck %s %struct.S = type { i32, i32, i8 } ; unsigned copy_noalias(S* __restrict a, S *b, int n) { ; for (int i = 0; i < n; i++) { ; a[i] = b[i]; ; } ; return sizeof(a[0]); ; } ; Function Attrs: nofree nounwind uwtable mustprogress define dso_local i32 @copy_noalias(ptr noalias nocapture %a, ptr nocapture readonly %b, i32 %n) local_unnamed_addr #0 { ; CHECK-LABEL: @copy_noalias( ; CHECK-NEXT: entry: ; CHECK-NEXT: [[CMP7:%.*]] = icmp sgt i32 [[N:%.*]], 0 ; CHECK-NEXT: br i1 [[CMP7]], label [[FOR_BODY_PREHEADER:%.*]], label [[FOR_COND_CLEANUP:%.*]] ; CHECK: for.body.preheader: ; CHECK-NEXT: br label [[FOR_BODY:%.*]] ; CHECK: for.cond.cleanup.loopexit: ; CHECK-NEXT: br label [[FOR_COND_CLEANUP]] ; CHECK: for.cond.cleanup: ; CHECK-NEXT: ret i32 12 ; CHECK: for.body: ; CHECK-NEXT: [[I_08:%.*]] = phi i32 [ [[INC:%.*]], [[FOR_BODY]] ], [ 0, [[FOR_BODY_PREHEADER]] ] ; CHECK-NEXT: [[IDXPROM:%.*]] = zext i32 [[I_08]] to i64 ; CHECK-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds [[STRUCT_S:%.*]], ptr [[B:%.*]], i64 [[IDXPROM]] ; CHECK-NEXT: [[ARRAYIDX2:%.*]] = getelementptr inbounds [[STRUCT_S]], ptr [[A:%.*]], i64 [[IDXPROM]] ; CHECK-NEXT: call void @llvm.memcpy.inline.p0.p0.i64(ptr nonnull align 4 dereferenceable(12) [[ARRAYIDX2]], ptr nonnull align 4 dereferenceable(12) [[ARRAYIDX]], i64 12, i1 false) ; CHECK-NEXT: [[INC]] = add nuw nsw i32 [[I_08]], 1 ; CHECK-NEXT: [[CMP:%.*]] = icmp slt i32 [[INC]], [[N]] ; CHECK-NEXT: br i1 [[CMP]], label [[FOR_BODY]], label [[FOR_COND_CLEANUP_LOOPEXIT:%.*]] ; entry: %cmp7 = icmp sgt i32 %n, 0 br i1 %cmp7, label %for.body.preheader, label %for.cond.cleanup for.body.preheader: ; preds = %entry br label %for.body for.cond.cleanup.loopexit: ; preds = %for.body br label %for.cond.cleanup for.cond.cleanup: ; preds = %for.cond.cleanup.loopexit, %entry ret i32 12 for.body: ; preds = %for.body.preheader, %for.body %i.08 = phi i32 [ %inc, %for.body ], [ 0, %for.body.preheader ] %idxprom = zext i32 %i.08 to i64 %arrayidx = getelementptr inbounds %struct.S, ptr %b, i64 %idxprom %arrayidx2 = getelementptr inbounds %struct.S, ptr %a, i64 %idxprom call void @llvm.memcpy.inline.p0.p0.i64(ptr nonnull align 4 dereferenceable(12) %arrayidx2, ptr nonnull align 4 dereferenceable(12) %arrayidx, i64 12, i1 false) %inc = add nuw nsw i32 %i.08, 1 %cmp = icmp slt i32 %inc, %n br i1 %cmp, label %for.body, label %for.cond.cleanup.loopexit } ; Function Attrs: argmemonly nofree nosync nounwind willreturn declare void @llvm.memcpy.inline.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #1