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