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101032
2012 Feb 25
3
[LLVMdev] Missed optimization on array initialization
Prompted by a SO post
(http://stackoverflow.com/questions/9441882/compiler-instruction-reordering-optimizations-in-c-and-what-inhibits-them/9442363)
I checked and found that LLVM yields the same (seemingly) suboptimal
code as MSVC.
Consider the following, simplified, C snippet:
extern void bar(int*);
void foo(int a)
{
int ar[100] = {a};
if (a)
return;
bar(ar);
}