43 lines
1.8 KiB
LLVM
43 lines
1.8 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -S -passes=memcpyopt < %s | FileCheck %s
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; The memcpy here is *not* dead, because it reads memory written in a previous
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; loop iteration.
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define void @test(i1 %c, ptr nocapture noundef readonly %path, ptr noundef writeonly %name) {
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; CHECK-LABEL: @test(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[TMP:%.*]] = alloca [260 x i8], align 16
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; CHECK-NEXT: br label [[WHILE_BODY:%.*]]
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; CHECK: while.body:
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; CHECK-NEXT: [[IV:%.*]] = phi i64 [ [[IV_NEXT:%.*]], [[WHILE_BODY]] ], [ 259, [[ENTRY:%.*]] ]
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; CHECK-NEXT: [[IV_NEXT]] = add nsw i64 [[IV]], -1
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; CHECK-NEXT: [[TMP_IV:%.*]] = getelementptr inbounds [260 x i8], ptr [[TMP]], i64 0, i64 [[IV]]
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; CHECK-NEXT: store i8 42, ptr [[TMP_IV]], align 1
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; CHECK-NEXT: br i1 [[C:%.*]], label [[WHILE_BODY]], label [[EXIT:%.*]]
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; CHECK: exit:
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; CHECK-NEXT: [[TMP_IV_1:%.*]] = getelementptr inbounds i8, ptr [[TMP_IV]], i64 1
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; CHECK-NEXT: [[LEN:%.*]] = sub nsw i64 259, [[IV]]
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; CHECK-NEXT: call void @llvm.memcpy.p0.p0.i64(ptr align 1 [[NAME:%.*]], ptr nonnull align 1 [[TMP_IV_1]], i64 [[LEN]], i1 false)
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; CHECK-NEXT: ret void
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;
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entry:
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%tmp = alloca [260 x i8], align 16
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br label %while.body
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while.body:
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%iv = phi i64 [ %iv.next, %while.body ], [ 259, %entry ]
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%iv.next = add nsw i64 %iv, -1
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%tmp.iv = getelementptr inbounds [260 x i8], ptr %tmp, i64 0, i64 %iv
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store i8 42, ptr %tmp.iv, align 1
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br i1 %c, label %while.body, label %exit
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exit:
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%tmp.iv.1 = getelementptr inbounds i8, ptr %tmp.iv, i64 1
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%len = sub nsw i64 259, %iv
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call void @llvm.memcpy.p0.p0.i64(ptr align 1 %name, ptr nonnull align 1 %tmp.iv.1, i64 %len, i1 false)
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ret void
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}
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declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly %0, ptr noalias nocapture readonly %1, i64 %2, i1 immarg %3)
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