https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102121
Bug ID: 102121
Summary: switch conversion to load table should do integer
compression
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Keywords: missed-optimization
Severity: enhancement
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: pinskia at gcc dot gnu.org
Target Milestone: ---
Take:
int f(int a)
{
switch (a)
{
case 0:
return 100;
case 1:
return 200;
case 3:
return 250;
case 4:
return 0;
case 5:
return 7;
case 6:
return 3;
}
return 0;
}
int f1(int a)
{
unsigned char t = 0;
switch (a)
{
case 0:
t=100;
break;
case 1:
t = 200u;
break;
case 3:
t = 250u;
break;
case 4:
t = 0;
break;
case 5:
t = 7;
break;
case 6:
t = 3;
break;
}
asm("":"+r"(t));
return t;
}
These two functions should have the same assembly and the load table should be
using byte loads for both.
