91 lines
3.6 KiB
LLVM
91 lines
3.6 KiB
LLVM
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; RUN: opt < %s -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.p0i8.p0i8.i64(i8* nocapture writeonly, i8* nocapture readonly, i64, i1)
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; Check that we do basic propagation of nonnull when rewriting.
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define i8* @propagate_nonnull(i32* %v) {
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; CHECK-LABEL: define i8* @propagate_nonnull(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: %[[A:.*]] = alloca i8*
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; CHECK-NEXT: %[[V_CAST:.*]] = bitcast i32* %v to i8*
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; CHECK-NEXT: store i8* %[[V_CAST]], i8** %[[A]]
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; CHECK-NEXT: %[[LOAD:.*]] = load volatile i8*, i8** %[[A]], align 8, !nonnull !0
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; CHECK-NEXT: ret i8* %[[LOAD]]
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entry:
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%a = alloca [2 x i8*]
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%a.gep0 = getelementptr [2 x i8*], [2 x i8*]* %a, i32 0, i32 0
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%a.gep1 = getelementptr [2 x i8*], [2 x i8*]* %a, i32 0, i32 1
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%a.gep0.cast = bitcast i8** %a.gep0 to i32**
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%a.gep1.cast = bitcast i8** %a.gep1 to i32**
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store i32* %v, i32** %a.gep1.cast
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store i32* null, i32** %a.gep0.cast
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%load = load volatile i8*, i8** %a.gep1, !nonnull !0
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ret i8* %load
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}
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define float* @turn_nonnull_into_assume(float** %arg) {
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; CHECK-LABEL: define float* @turn_nonnull_into_assume(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: %[[RETURN:.*]] = load float*, float** %arg, align 8
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; CHECK-NEXT: %[[ASSUME:.*]] = icmp ne float* %[[RETURN]], null
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; CHECK-NEXT: call void @llvm.assume(i1 %[[ASSUME]])
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; CHECK-NEXT: ret float* %[[RETURN]]
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entry:
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%buf = alloca float*
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%_arg_i8 = bitcast float** %arg to i8*
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%_buf_i8 = bitcast float** %buf to i8*
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call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 8 %_buf_i8, i8* align 8 %_arg_i8, i64 8, i1 false)
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%ret = load float*, float** %buf, align 8, !nonnull !0
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ret float* %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 i8* @propagate_nonnull_to_int() {
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; CHECK-LABEL: define i8* @propagate_nonnull_to_int(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: %[[A:.*]] = alloca i8*
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; CHECK-NEXT: store i8* inttoptr (i64 42 to i8*), i8** %[[A]]
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; CHECK-NEXT: %[[LOAD:.*]] = load volatile i8*, i8** %[[A]]
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; CHECK-NEXT: ret i8* %[[LOAD]]
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entry:
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%a = alloca [2 x i8*]
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%a.gep0 = getelementptr [2 x i8*], [2 x i8*]* %a, i32 0, i32 0
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%a.gep1 = getelementptr [2 x i8*], [2 x i8*]* %a, i32 0, i32 1
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%a.gep0.cast = bitcast i8** %a.gep0 to i64*
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%a.gep1.cast = bitcast i8** %a.gep1 to i64*
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store i64 42, i64* %a.gep1.cast
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store i64 0, i64* %a.gep0.cast
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%load = load volatile i8*, i8** %a.gep1, !nonnull !0
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ret i8* %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 i8* @propagate_nonnull_to_int_and_promote() {
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; CHECK-LABEL: define i8* @propagate_nonnull_to_int_and_promote(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: ret i8* inttoptr (i64 42 to i8*)
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entry:
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%a = alloca [2 x i8*], align 8
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%a.gep0 = getelementptr [2 x i8*], [2 x i8*]* %a, i32 0, i32 0
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%a.gep1 = getelementptr [2 x i8*], [2 x i8*]* %a, i32 0, i32 1
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%a.gep0.cast = bitcast i8** %a.gep0 to i64*
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%a.gep1.cast = bitcast i8** %a.gep1 to i64*
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store i64 42, i64* %a.gep1.cast
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store i64 0, i64* %a.gep0.cast
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%load = load i8*, i8** %a.gep1, align 8, !nonnull !0
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ret i8* %load
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}
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!0 = !{}
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