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Add a dereferenceable attribute

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This attribute indicates that the parameter or return pointer is
dereferenceable. Practically speaking, loads from such a pointer within the
associated byte range are safe to speculatively execute. Such pointer
parameters are common in source languages (C++ references, for example).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@213385 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Hal Finkel
2014-07-18 15:51:28 +00:00
parent a11bf68f6c
commit 11af4b49b2
22 changed files with 388 additions and 18 deletions
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10
test/Bitcode/attributes.ll
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@@ -229,6 +229,16 @@ define void @f38() unnamed_addr jumptable {
unreachable
}
define dereferenceable(2) i8* @f39(i8* dereferenceable(1) %a) {
; CHECK: define dereferenceable(2) i8* @f39(i8* dereferenceable(1) %a) {
ret i8* %a
}
define dereferenceable(18446744073709551606) i8* @f40(i8* dereferenceable(18446744073709551615) %a) {
; CHECK: define dereferenceable(18446744073709551606) i8* @f40(i8* dereferenceable(18446744073709551615) %a) {
ret i8* %a
}
; CHECK: attributes #0 = { noreturn }
; CHECK: attributes #1 = { nounwind }
; CHECK: attributes #2 = { readnone }