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On Feb 25, 2012, at 3:17 AM, Carlo Alberto Ferraris wrote: > 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

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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); }