durin42 added inline comments.
================
Comment at:
clang/test/CodeGen/catch-alignment-assumption-attribute-alloc_align-on-function-variable.cpp:55
// CHECK-NEXT: %[[ALIGNMENT_RELOADED:.*]] = load i64,
i64* %[[ALIGNMENT_ADDR]], align 8
- // CHECK-NEXT: %[[X_RETURNED:.*]] = call noundef i8**
@[[PASSTHROUGH]](i8** noundef %[[X_RELOADED]], i64 noundef
%[[ALIGNMENT_RELOADED]])
- // CHECK-SANITIZE-NEXT: %[[PTRINT:.*]] = ptrtoint i8**
%[[X_RETURNED]] to i64
- // CHECK-SANITIZE-NEXT: %[[MASK:.*]] = sub i64
%[[ALIGNMENT_RELOADED]], 1
- // CHECK-SANITIZE-NEXT: %[[MASKEDPTR:.*]] = and i64
%[[PTRINT]], %[[MASK]]
- // CHECK-SANITIZE-NEXT: %[[MASKCOND:.*]] = icmp eq i64
%[[MASKEDPTR]], 0
- // CHECK-SANITIZE-NEXT: %[[PTRINT_DUP:.*]] = ptrtoint i8**
%[[X_RETURNED]] to i64, !nosanitize
- // CHECK-SANITIZE-NEXT: br i1 %[[MASKCOND]], label
%[[CONT:.*]], label %[[HANDLER_ALIGNMENT_ASSUMPTION:[^,]+]],{{.*}} !nosanitize
- // CHECK-SANITIZE: [[HANDLER_ALIGNMENT_ASSUMPTION]]:
- // CHECK-SANITIZE-NORECOVER-NEXT: call void
@__ubsan_handle_alignment_assumption_abort(i8* bitcast ({ {{{.*}}}, {{{.*}}},
{{{.*}}}* }* @[[LINE_100_ALIGNMENT_ASSUMPTION]] to i8*), i64 %[[PTRINT_DUP]],
i64 %[[ALIGNMENT_RELOADED]], i64 0){{.*}}, !nosanitize
- // CHECK-SANITIZE-RECOVER-NEXT: call void
@__ubsan_handle_alignment_assumption(i8* bitcast ({ {{{.*}}}, {{{.*}}},
{{{.*}}}* }* @[[LINE_100_ALIGNMENT_ASSUMPTION]] to i8*), i64 %[[PTRINT_DUP]],
i64 %[[ALIGNMENT_RELOADED]], i64 0){{.*}}, !nosanitize
- // CHECK-SANITIZE-TRAP-NEXT: call void @llvm.ubsantrap(i8
23){{.*}}, !nosanitize
- // CHECK-SANITIZE-UNREACHABLE-NEXT: unreachable, !nosanitize
- // CHECK-SANITIZE: [[CONT]]:
- // CHECK-NEXT: call void @llvm.assume(i1 true) [
"align"(i8** %[[X_RETURNED]], i64 %1) ]
+ // CHECK-NEXT: %[[X_RETURNED:.*]] = call noundef i8**
@[[PASSTHROUGH]](i8** noundef %[[X_RELOADED]], i64 allocalign noundef
%[[ALIGNMENT_RELOADED]])
// CHECK-NEXT: ret i8** %[[X_RETURNED]]
----------------
lebedev.ri wrote:
> This is a regression, the old behavior was correct.
I don't think so: we now (as of D121629) check the alignment of the returned
pointer in the callee instead of the caller, and LLVM knows about allocalign
implying an alignment at the callsite. So I think it's correctly optimizing
away the sanitizer checks here.
You or @jyknight will need to correct me if my understanding is incorrect here,
but my understanding was that this change was what motivated D121629 in the
first place.
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D119271/new/
https://reviews.llvm.org/D119271
_______________________________________________
cfe-commits mailing list
cfe-commits@lists.llvm.org
https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
