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100030
2008 Sep 04
5
[LLVMdev] missed optimizations
Hi,
I have two questions about optimizations performed by llvm.
Consider these simple functions:
int x(int b) { return b?4:6; }
int y() { return x(0); }
int x2() { return 5; }
int y2() { return x2(); }
the optimized bitcode (with clang + opt -std-compiler-opts) is:
define i32 @y(...) nounwind {
entry:
ret i32 6
}
define i32 @y2(...) nounwind {
entry:
%call = call i32 (...)* @x2( ) ;