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c++ Programming Glossary: stalledWhy does changing `const ull` to `const ull&` in function parameter result in performance gain? http://stackoverflow.com/questions/14805641/why-does-changing-const-ull-to-const-ull-in-function-parameter-result-in-pe counts when in fact it was the previous instruction that stalled or missed in the cache or there was a mis predicted branch etc... is and often the interrupt happens while the processor is stalled due to a cache miss or a mis predicted branch or some internal..
May compiler optimizations be inhibited by multi-threading? http://stackoverflow.com/questions/16807766/may-compiler-optimizations-be-inhibited-by-multi-threading return fpeephole fsched interblock fsched spec fsched stalled insns dep fsigned zeros fsplit ivs in unroller fstack protector.. return fpeephole fsched interblock fsched spec fsched stalled insns dep fsigned zeros fsplit ivs in unroller fstack protector..
Why does gcc generate 15-20% faster code if I optimize for SIZE instead of speed? http://stackoverflow.com/questions/19470873/why-does-gcc-generate-15-20-faster-code-if-i-optimize-for-size-instead-of-speed only get one consistent result out of it O2 602 312 864 stalled cycles frontend # 0.00 frontend cycles idle 3 318 cache misses.. sum z 79.79 add eax ebx For fno align 604 072 552 stalled cycles frontend # 0.00 frontend cycles idle 9 508 cache misses.. eax ebx For fno omit frame pointer 404 625 639 stalled cycles frontend # 0.00 frontend cycles idle 10 514 cache misses..
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