29441e4f5f
This PR removes the old `nocapture` attribute, replacing it with the new `captures` attribute introduced in #116990. This change is intended to be essentially NFC, replacing existing uses of `nocapture` with `captures(none)` without adding any new analysis capabilities. Making use of non-`none` values is left for a followup. Some notes: * `nocapture` will be upgraded to `captures(none)` by the bitcode reader. * `nocapture` will also be upgraded by the textual IR reader. This is to make it easier to use old IR files and somewhat reduce the test churn in this PR. * Helper APIs like `doesNotCapture()` will check for `captures(none)`. * MLIR import will convert `captures(none)` into an `llvm.nocapture` attribute. The representation in the LLVM IR dialect should be updated separately.
52 lines
1.5 KiB
LLVM
52 lines
1.5 KiB
LLVM
; RUN: opt -O2 -mtriple=bpf-pc-linux -S -o - %s | FileCheck %s
|
|
;
|
|
; Check that stores from zero offset are not modified by bpf-preserve-static-offset.
|
|
;
|
|
; Source:
|
|
; #define __ctx __attribute__((preserve_static_offset))
|
|
;
|
|
; struct foo {
|
|
; int a;
|
|
; } __ctx;
|
|
;
|
|
; void bar(struct foo *p) {
|
|
; p->a = 0;
|
|
; }
|
|
;
|
|
; Compilation flag:
|
|
; clang -cc1 -O2 -triple bpf -S -emit-llvm -disable-llvm-passes -o - \
|
|
; | opt -passes=function(sroa) -S -o -
|
|
|
|
%struct.foo = type { i32 }
|
|
|
|
; Function Attrs: nounwind
|
|
define dso_local void @bar(ptr noundef %p) #0 {
|
|
entry:
|
|
%0 = call ptr @llvm.preserve.static.offset(ptr %p)
|
|
%a = getelementptr inbounds %struct.foo, ptr %0, i32 0, i32 0
|
|
store i32 0, ptr %a, align 4, !tbaa !2
|
|
ret void
|
|
}
|
|
|
|
; CHECK: define dso_local void @bar(ptr noundef writeonly captures(none) initializes((0, 4)) %[[p:.*]])
|
|
; CHECK-NEXT: entry:
|
|
; CHECK-NEXT: store i32 0, ptr %[[p]], align 4, !tbaa
|
|
; CHECK-NEXT: ret void
|
|
|
|
; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
|
|
declare ptr @llvm.preserve.static.offset(ptr readnone) #1
|
|
|
|
attributes #0 = { nounwind "no-trapping-math"="true" "stack-protector-buffer-size"="8" }
|
|
attributes #1 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }
|
|
|
|
!llvm.module.flags = !{!0}
|
|
!llvm.ident = !{!1}
|
|
|
|
!0 = !{i32 1, !"wchar_size", i32 4}
|
|
!1 = !{!"clang"}
|
|
!2 = !{!3, !4, i64 0}
|
|
!3 = !{!"foo", !4, i64 0}
|
|
!4 = !{!"int", !5, i64 0}
|
|
!5 = !{!"omnipotent char", !6, i64 0}
|
|
!6 = !{!"Simple C/C++ TBAA"}
|