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Avoid unnecessary casts in struct_GEP

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This commit is contained in:
Jed Davis 2013-02-22 22:03:59 -08:00
parent 5e2302a56f
commit 8a1706610b
1 changed files with 12 additions and 8 deletions
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20
src/librustc/middle/trans/adt.rs
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@ -205,24 +205,28 @@ pub fn trans_GEP(bcx: block, r: &Repr, val: ValueRef, discr: int, ix: uint)
NoDtor => val,
DtorPresent | DtorAbsent => GEPi(bcx, val, [0, 0])
};
struct_GEP(bcx, st, val, ix)
struct_GEP(bcx, st, val, ix, false)
}
General(ref cases) => {
struct_GEP(bcx, &cases[discr as uint],
GEPi(bcx, val, [0, 1]), ix)
GEPi(bcx, val, [0, 1]), ix, true)
}
}
}
fn struct_GEP(bcx: block, st: &Struct, val: ValueRef, ix: uint)
-> ValueRef {
fn struct_GEP(bcx: block, st: &Struct, val: ValueRef, ix: uint,
needs_cast: bool) -> ValueRef {
let ccx = bcx.ccx();
let real_llty = T_struct(st.fields.map(
|&ty| type_of::type_of(ccx, ty)));
let cast_val = PointerCast(bcx, val, T_ptr(real_llty));
let val = if needs_cast {
let real_llty = T_struct(st.fields.map(
|&ty| type_of::type_of(ccx, ty)));
PointerCast(bcx, val, T_ptr(real_llty))
} else {
val
};
GEPi(bcx, cast_val, [0, ix])
GEPi(bcx, val, [0, ix])
}
pub fn trans_const(ccx: @CrateContext, r: &Repr, discr: int,