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auto merge of #7717 : dotdash/rust/transmute, r=pcwalton

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Currently, immediate values are copied into an alloca only to have an
addressable storage so that it can be used with memcpy. Obviously we
can skip the memcpy in this case.
This commit is contained in:
bors 2013-07-12 07:43:38 -07:00
commit 96b3163c83
1 changed files with 11 additions and 14 deletions
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25
src/librustc/middle/trans/foreign.rs
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@ -725,24 +725,21 @@ pub fn trans_intrinsic(ccx: @mut CrateContext,
}
if !ty::type_is_nil(out_type) {
// NB: Do not use a Load and Store here. This causes massive
// code bloat when `transmute` is used on large structural
// types.
let lldestptr = fcx.llretptr.get();
let lldestptr = PointerCast(bcx, lldestptr, Type::i8p());
let llsrcval = get_param(decl, first_real_arg);
let llsrcptr = if ty::type_is_immediate(ccx.tcx, in_type) {
let llsrcptr = alloca(bcx, llintype, "__llsrcptr");
Store(bcx, llsrcval, llsrcptr);
llsrcptr
if ty::type_is_immediate(ccx.tcx, in_type) {
let lldestptr = PointerCast(bcx, lldestptr, llintype.ptr_to());
Store(bcx, llsrcval, lldestptr);
} else {
llsrcval
};
let llsrcptr = PointerCast(bcx, llsrcptr, Type::i8p());
// NB: Do not use a Load and Store here. This causes massive
// code bloat when `transmute` is used on large structural
// types.
let lldestptr = PointerCast(bcx, lldestptr, Type::i8p());
let llsrcptr = PointerCast(bcx, llsrcval, Type::i8p());
let llsize = llsize_of(ccx, llintype);
call_memcpy(bcx, lldestptr, llsrcptr, llsize, 1);
let llsize = llsize_of(ccx, llintype);
call_memcpy(bcx, lldestptr, llsrcptr, llsize, 1);
};
}
}
"needs_drop" => {