don't use dead loads as tests.

llvm-svn: 83985
This commit is contained in:
Chris Lattner 2009-10-13 17:39:29 +00:00
parent ee9d2f0cc0
commit a433d8cb67

View File

@ -1,4 +1,4 @@
; RUN: opt < %s -basicaa -gvn -S | grep load | count 1
; RUN: opt < %s -basicaa -gvn -instcombine -S | grep {ret i32 0}
@flag0 = internal global i32 zeroinitializer
@turn = internal global i32 zeroinitializer
@ -6,9 +6,10 @@
define i32 @main() {
%a = load i32* @flag0
%b = tail call i32 @llvm.atomic.swap.i32.p0i32(i32* @turn, i32 1)
%b = tail call i32 @llvm.atomic.swap.i32.p0i32(i32* @turn, i32 1)
%c = load i32* @flag0
ret i32 %c
%d = sub i32 %a, %c
ret i32 %d
}
declare i32 @llvm.atomic.swap.i32.p0i32(i32*, i32) nounwind