0f46e31cfb
As part of the migration to ptradd (https://discourse.llvm.org/t/rfc-replacing-getelementptr-with-ptradd/68699), we need to change the representation of the `inrange` attribute, which is used for vtable splitting. Currently, inrange is specified as follows: ``` getelementptr inbounds ({ [4 x ptr], [4 x ptr] }, ptr @vt, i64 0, inrange i32 1, i64 2) ``` The `inrange` is placed on a GEP index, and all accesses must be "in range" of that index. The new representation is as follows: ``` getelementptr inbounds inrange(-16, 16) ({ [4 x ptr], [4 x ptr] }, ptr @vt, i64 0, i32 1, i64 2) ``` This specifies which offsets are "in range" of the GEP result. The new representation will continue working when canonicalizing to ptradd representation: ``` getelementptr inbounds inrange(-16, 16) (i8, ptr @vt, i64 48) ``` The inrange offsets are relative to the return value of the GEP. An alternative design could make them relative to the source pointer instead. The result-relative format was chosen on the off-chance that we want to extend support to non-constant GEPs in the future, in which case this variant is more expressive. This implementation "upgrades" the old inrange representation in bitcode by simply dropping it. This is a very niche feature, and I don't think trying to upgrade it is worthwhile. Let me know if you disagree.
38 lines
1.5 KiB
LLVM
38 lines
1.5 KiB
LLVM
; Test for a bug specific to the new pass manager where we may build a domtree
|
|
; to make more precise AA queries for functions.
|
|
;
|
|
; RUN: opt -passes='no-op-module' -debug-pass-manager -thinlto-bc -thinlto-split-lto-unit -o %t %s
|
|
; RUN: llvm-modextract -b -n 0 -o - %t | llvm-dis | FileCheck --check-prefix=M0 %s
|
|
; RUN: llvm-modextract -b -n 1 -o - %t | llvm-dis | FileCheck --check-prefix=M1 %s
|
|
|
|
target triple = "x86_64-unknown-linux-gnu"
|
|
|
|
%struct.hoge = type { %struct.widget }
|
|
%struct.widget = type { ptr }
|
|
|
|
; M0: @global = local_unnamed_addr global
|
|
; M1-NOT: @global
|
|
@global = local_unnamed_addr global %struct.hoge { %struct.widget { ptr getelementptr inbounds inrange(-16, 8) ({ [3 x ptr] }, ptr @global.1, i32 0, i32 0, i32 2) } }, align 8
|
|
|
|
; M0: @global.1 = external unnamed_addr constant
|
|
; M1: @global.1 = linkonce_odr unnamed_addr constant
|
|
@global.1 = linkonce_odr unnamed_addr constant { [3 x ptr] } { [3 x ptr] [ptr null, ptr @global.4, ptr @quux] }, align 8, !type !0
|
|
|
|
; M0: @global.2 = external global
|
|
; M1-NOT: @global.2
|
|
@global.2 = external global ptr
|
|
|
|
; M0: @global.3 = linkonce_odr constant
|
|
; M1-NOT: @global.3
|
|
@global.3 = linkonce_odr constant [22 x i8] c"zzzzzzzzzzzzzzzzzzzzz\00"
|
|
|
|
; M0: @global.4 = linkonce_odr constant
|
|
; M1: @global.4 = external constant
|
|
@global.4 = linkonce_odr constant { ptr, ptr }{ ptr getelementptr inbounds (ptr, ptr @global.2, i64 2), ptr @global.3 }
|
|
|
|
@llvm.global_ctors = appending global [0 x { i32, ptr, ptr }] zeroinitializer
|
|
|
|
declare i32 @quux(ptr) unnamed_addr
|
|
|
|
!0 = !{i64 16, !"yyyyyyyyyyyyyyyyyyyyyyyyy"}
|