https://bugs.llvm.org/show_bug.cgi?id=41242
Bug ID: 41242
Summary: jump table switch also contains a branch (conditional
jump to a first case)
Product: new-bugs
Version: 7.0
Hardware: PC
OS: Windows NT
Status: NEW
Keywords: code-quality
Severity: enhancement
Priority: P
Component: new bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
int f1();
int f2();
int f3();
int f4();
int f5();
int foo(int i)
{
switch (i) {
case 1: return f1();
case 2: return f2();
case 3: return f3();
case 4: return f4();
case 5: return f5();
}
__builtin_unreachable();
}
The branch conditionally jumps to the first case. This happens for different
architectures, and GCC does not do this.
x86_64 https://godbolt.org/z/aYDsUR
ARM https://godbolt.org/z/j4c0Jf
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