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debuginfo: Get rid of redundant argument copying with debuginfo activated

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This commit is contained in:
Michael Woerister 2013-12-13 13:19:11 +01:00
parent 7eae649a01
commit 45e472aa4b
1 changed files with 5 additions and 1 deletions
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6
src/librustc/middle/trans/_match.rs
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@ -220,6 +220,7 @@ use util::common::indenter;
use util::ppaux::{Repr, vec_map_to_str};
use std::hashmap::HashMap;
use std::ptr;
use std::vec;
use syntax::ast;
use syntax::ast::Ident;
@ -2046,7 +2047,10 @@ pub fn store_arg(mut bcx: @mut Block,
// Debug information (the llvm.dbg.declare intrinsic to be precise) always expects to get an
// alloca, which only is the case on the general path, so lets disable the optimized path when
// debug info is enabled.
let fast_path = !bcx.ccx().sess.opts.extra_debuginfo && simple_identifier(pat).is_some();
let arg_is_alloca = unsafe { llvm::LLVMIsAAllocaInst(llval) != ptr::null() };
let fast_path = (arg_is_alloca || !bcx.ccx().sess.opts.extra_debuginfo)
&& simple_identifier(pat).is_some();
if fast_path {
// Optimized path for `x: T` case. This just adopts