79 lines
2.8 KiB
LLVM
79 lines
2.8 KiB
LLVM
; RUN: opt < %s -passes=sroa -S | FileCheck %s
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;
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; Make sure that SROA doesn't lose nonnull metadata
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; on loads from allocas that get optimized out.
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declare void @llvm.memcpy.p0.p0.i64(ptr nocapture writeonly, ptr nocapture readonly, i64, i1)
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; Check that we do basic propagation of nonnull when rewriting.
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define ptr @propagate_nonnull(ptr %v) {
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; CHECK-LABEL: define ptr @propagate_nonnull(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: %[[A:.*]] = alloca ptr
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; CHECK-NEXT: store ptr %v, ptr %[[A]]
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; CHECK-NEXT: %[[LOAD:.*]] = load volatile ptr, ptr %[[A]], align 8, !nonnull !0
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; CHECK-NEXT: ret ptr %[[LOAD]]
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entry:
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%a = alloca [2 x ptr]
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%a.gep1 = getelementptr [2 x ptr], ptr %a, i32 0, i32 1
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store ptr %v, ptr %a.gep1
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store ptr null, ptr %a
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%load = load volatile ptr, ptr %a.gep1, !nonnull !0
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ret ptr %load
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}
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define ptr @turn_nonnull_into_assume(ptr %arg) {
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; CHECK-LABEL: define ptr @turn_nonnull_into_assume(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: %[[RETURN:.*]] = load ptr, ptr %arg, align 8
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; CHECK-NEXT: %[[ASSUME:.*]] = icmp ne ptr %[[RETURN]], null
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; CHECK-NEXT: call void @llvm.assume(i1 %[[ASSUME]])
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; CHECK-NEXT: ret ptr %[[RETURN]]
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entry:
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%buf = alloca ptr
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call void @llvm.memcpy.p0.p0.i64(ptr align 8 %buf, ptr align 8 %arg, i64 8, i1 false)
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%ret = load ptr, ptr %buf, align 8, !nonnull !0
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ret ptr %ret
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}
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; Make sure we properly handle the !nonnull attribute when we convert
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; a pointer load to an integer load.
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; FIXME: While this doesn't do anythnig actively harmful today, it really
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; should propagate the !nonnull metadata to range metadata. The irony is, it
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; *does* initially, but then we lose that !range metadata before we finish
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; SROA.
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define ptr @propagate_nonnull_to_int() {
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; CHECK-LABEL: define ptr @propagate_nonnull_to_int(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: %[[A:.*]] = alloca ptr
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; CHECK-NEXT: store ptr inttoptr (i64 42 to ptr), ptr %[[A]]
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; CHECK-NEXT: %[[LOAD:.*]] = load volatile ptr, ptr %[[A]]
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; CHECK-NEXT: ret ptr %[[LOAD]]
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entry:
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%a = alloca [2 x ptr]
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%a.gep1 = getelementptr [2 x ptr], ptr %a, i32 0, i32 1
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store i64 42, ptr %a.gep1
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store i64 0, ptr %a
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%load = load volatile ptr, ptr %a.gep1, !nonnull !0
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ret ptr %load
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}
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; Make sure we properly handle the !nonnull attribute when we convert
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; a pointer load to an integer load and immediately promote it to an SSA
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; register. This can fail in interesting ways due to the rewrite iteration of
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; SROA, resulting in PR32902.
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define ptr @propagate_nonnull_to_int_and_promote() {
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; CHECK-LABEL: define ptr @propagate_nonnull_to_int_and_promote(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: ret ptr inttoptr (i64 42 to ptr)
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entry:
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%a = alloca [2 x ptr], align 8
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%a.gep1 = getelementptr [2 x ptr], ptr %a, i32 0, i32 1
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store i64 42, ptr %a.gep1
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store i64 0, ptr %a
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%load = load ptr, ptr %a.gep1, align 8, !nonnull !0
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ret ptr %load
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}
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!0 = !{}
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