https://bugs.llvm.org/show_bug.cgi?id=41259
Bug ID: 41259
Summary: switch is not converted into an argument LUT when a
call return value is discarded
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],
[email protected]
For this code an argument LUT is constructed
int f(int);
int foo(int x)
{
switch (x) {
case 0: return f(12);
case 1: return f(34);
case 2: return f(56);
case 3: return f(78);
case 4: return f(90);
}
}
But if the return value is discarded, as Hans Wennborg noticed in
https://bugs.llvm.org/show_bug.cgi?id=41242#c4
int f(int);
int foo(int x)
{
switch (x) {
case 0: f(12); break;
case 1: f(34); break;
case 2: f(56); break;
case 3: f(78); break;
case 4: f(90); break;
}
}
The optimization did not work, and jump table is produced, while it could just
make a call instead of a jump.
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