mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-26 21:32:10 +00:00
42a9da35b8
Summary: Don't speculate loads under ThreadSanitizer. This fixes https://code.google.com/p/thread-sanitizer/issues/detail?id=40 Also discussed here: http://lists.cs.uiuc.edu/pipermail/llvmdev/2013-November/067929.html Reviewers: chandlerc Reviewed By: chandlerc CC: llvm-commits, dvyukov Differential Revision: http://llvm-reviews.chandlerc.com/D2227 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@195324 91177308-0d34-0410-b5e6-96231b3b80d8
41 lines
1.2 KiB
LLVM
41 lines
1.2 KiB
LLVM
; RUN: opt -simplifycfg -S %s | FileCheck %s
|
|
; Make sure we don't speculate loads under ThreadSanitizer.
|
|
@g = global i32 0, align 4
|
|
|
|
define i32 @TestNoTsan(i32 %cond) nounwind readonly uwtable {
|
|
entry:
|
|
%tobool = icmp eq i32 %cond, 0
|
|
br i1 %tobool, label %return, label %if.then
|
|
|
|
if.then: ; preds = %entry
|
|
%0 = load i32* @g, align 4
|
|
br label %return
|
|
|
|
return: ; preds = %entry, %if.then
|
|
%retval = phi i32 [ %0, %if.then ], [ 0, %entry ]
|
|
ret i32 %retval
|
|
; CHECK-LABEL: @TestNoTsan
|
|
; CHECK: %[[LOAD:[^ ]*]] = load
|
|
; CHECK: select{{.*}}[[LOAD]]
|
|
; CHECK: ret i32
|
|
}
|
|
|
|
define i32 @TestTsan(i32 %cond) nounwind readonly uwtable sanitize_thread {
|
|
entry:
|
|
%tobool = icmp eq i32 %cond, 0
|
|
br i1 %tobool, label %return, label %if.then
|
|
|
|
if.then: ; preds = %entry
|
|
%0 = load i32* @g, align 4
|
|
br label %return
|
|
|
|
return: ; preds = %entry, %if.then
|
|
%retval = phi i32 [ %0, %if.then ], [ 0, %entry ]
|
|
ret i32 %retval
|
|
; CHECK-LABEL: @TestTsan
|
|
; CHECK: br i1
|
|
; CHECK: load i32* @g
|
|
; CHECK: br label
|
|
; CHECK: ret i32
|
|
}
|