https://bugs.llvm.org/show_bug.cgi?id=51321
Bug ID: 51321
Summary: [DAGCombine] wrong result on -O3 -fuse-ld=lld
-flto=full
Product: libraries
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: AArch64
Assignee: unassignedb...@nondot.org
Reporter: zhongyu...@tom.com
CC: arnaud.degrandmai...@arm.com,
llvm-bugs@lists.llvm.org, smithp...@googlemail.com,
ties.st...@arm.com
base on the newest commit 41cedb1c, dag combine generate wrong code with the
attached test code. we expect the the run result is `c=1,h=49`, while now is
`c=0,h=49`, and disable the optimization of DAGCombiner::visitANDLike can get
expected right result.
clang -mcpu=tsv110 -O3 -fuse-ld=lld -Wall issue.c -save-temps
~/llvm-project-upstream(main) ยป install/bin/clang -v
Huawei Bisheng Compiler clang version 14.0.0
(ssh://g...@gitlab.huawei.com:2222/boole-compiler/llvm-project
41cedb1c9a380628ac162bf76148cbd143f41450)
======= test case =========
int printf(const char *, ...);
static int c = 2, d;
short g, h;
int main() {
g ^= 50; // 50
c = 0 || g; // 1
h = g - 1; // 49
d = h & 1; // 1
c &= d; // 1
printf("c=%d,h=%d\n", c, h);
// CHECK-RESULT: c=1,h=49
return 0;
}
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