sgundapa added a comment.
The switch-case statements generate two kinds of tables.
1. Jump tables
2. Lookup tables.
While the general assumption is that switch-case statements generate jump
tables, the below case generates a lookup table by late simplifycfg
int foo(int x) {
switch (x) {
case 0: return 9;
case 1: return 20;
case 2: return 14;
case 3: return 22;
case 4: return 12;
default: return 19;
}
}
generates a
@switch.table.foo = private unnamed_addr constant [5 x i32] [i32 9, i32 20, i32
14, i32 22, i32 12]
The lookup table is more an array return values as opposed to an array of
pointers in jump table.
The "-fno-XXX-flags" disable the generation of these tables.
-fno-switch-tables implies both -fno-jump-tables and -fno-lookup-tables
https://reviews.llvm.org/D35578
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