https://bugs.llvm.org/show_bug.cgi?id=35765
Bug ID: 35765
Summary: "X86 DAG->DAG Instruction Selection on function"
triggers wrong code
Product: new-bugs
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: babo...@gmail.com
CC: llvm-bugs@lists.llvm.org
clang trunk, x86_64, rev321482
> cat f.cpp
struct S {
unsigned short m : 11;
};
long long int ll;
S s1 = { 1403 };
long long int x = 2651237805702985558L;
S s2 = { 902 };
void foo() {
ll = (4 << (s1.m - 1398)) ^ (unsigned short)(x | ~s2.m);
}
int main() {
foo();
__builtin_printf("%lld\n", ll);
return 0;
}
> clang++ f.cpp -std=c++11 -o out -O0; ./out
65535
> clang++ f.cpp -std=c++11 -o out -O2; ./out
-1
clang 5.0 produces correct result, so this is regression.
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