mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-26 04:32:44 +01:00
3047a70ed9
- don't isntrument reads from constant globals. Saves ~1.5% of instrumented instructions on CPU2006 (counting static instructions, not their execution). - don't insrument reads from vtable (which is a global constant too). Saves ~5%. I did not measure the run-time impact of this, but it is certainly non-negative. llvm-svn: 154444
62 lines
1.8 KiB
LLVM
62 lines
1.8 KiB
LLVM
; RUN: opt < %s -tsan -S | FileCheck %s
|
|
; Check that tsan does not instrument reads from constant globals.
|
|
|
|
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
|
|
|
|
@const_global = external constant i32
|
|
define i32 @read_from_const_global() nounwind uwtable readnone {
|
|
entry:
|
|
%0 = load i32* @const_global, align 4
|
|
ret i32 %0
|
|
}
|
|
; CHECK: define i32 @read_from_const_global
|
|
; CHECK-NOT: __tsan
|
|
; CHECK: ret i32
|
|
|
|
@non_const_global = global i32 0, align 4
|
|
define i32 @read_from_non_const_global() nounwind uwtable readonly {
|
|
entry:
|
|
%0 = load i32* @non_const_global, align 4
|
|
ret i32 %0
|
|
}
|
|
|
|
; CHECK: define i32 @read_from_non_const_global
|
|
; CHECK: __tsan_read
|
|
; CHECK: ret i32
|
|
|
|
@const_global_array = external constant [10 x i32]
|
|
define i32 @read_from_const_global_array(i32 %idx) nounwind uwtable readnone {
|
|
entry:
|
|
%idxprom = sext i32 %idx to i64
|
|
%arrayidx = getelementptr inbounds [10 x i32]* @const_global_array, i64 0, i64 %idxprom
|
|
%0 = load i32* %arrayidx, align 4
|
|
ret i32 %0
|
|
}
|
|
|
|
; CHECK: define i32 @read_from_const_global_array
|
|
; CHECK-NOT: __tsan
|
|
; CHECK: ret i32
|
|
|
|
%struct.Foo = type { i32 (...)** }
|
|
define void @call_virtual_func(%struct.Foo* %f) uwtable {
|
|
entry:
|
|
%0 = bitcast %struct.Foo* %f to void (%struct.Foo*)***
|
|
%vtable = load void (%struct.Foo*)*** %0, align 8, !tbaa !3
|
|
%1 = load void (%struct.Foo*)** %vtable, align 8
|
|
call void %1(%struct.Foo* %f)
|
|
ret void
|
|
}
|
|
|
|
; CHECK: define void @call_virtual_func
|
|
; CHECK: __tsan_read
|
|
; CHECK: = load
|
|
; CHECK-NOT: __tsan_read
|
|
; CHECK: = load
|
|
; CHECK: ret void
|
|
|
|
!0 = metadata !{metadata !"int", metadata !1}
|
|
!1 = metadata !{metadata !"omnipotent char", metadata !2}
|
|
!2 = metadata !{metadata !"Simple C/C++ TBAA", null}
|
|
!3 = metadata !{metadata !"vtable pointer", metadata !2}
|
|
|