▲ 1168 ▼ Tell me the truth ... (europe.pub) submitted 1 year ago by cm0002@lemmy.world to c/programmer_humor@programming.dev 170 comments fedilink hide all child comments
[–] Aux@feddit.uk 0 points 1 year ago (5 children) Sorry, but you're very confused here. permalink fedilink source parent hideshow 5 child comments replies: [–] timhh@programming.dev 1 point 1 year ago (4 children) You said you can't read one byte. I showed that you can. Where's the confusion? permalink fedilink source parent hideshow 4 child comments replies: [–] Aux@feddit.uk 0 points 1 year ago (3 children) Internally it will still read a whole word. Because the CPU cannot read less than a word. And if you read the ARM article you linked, it literally says so. Thus any compiler worth their salt will align all byte variables to words for faster memory access. Unless you specifically disable such behaviour. So yeah, RTFM :) permalink fedilink source parent hideshow 3 child comments replies: [–] timhh@programming.dev 0 points 1 year ago (2 children) Wrong again. It depends on the CPU. They can absolutely read a single byte and they will do if you're reading from non-idempotent memory. If you're reading from idempotent memory they won't read a byte or a word. They'll likely read a whole cache line (usually 64 bytes). And if you read the ARM article you linked, it literally says so. Where? Thus any compiler worth their salt will align all byte variables to words for faster memory access. No they won't because it isn't faster. The CPU will read the whole cache line that contains the byte. RTFM Well, I would but no manual says that because it's wrong! permalink fedilink source parent hideshow 2 child comments replies: [–] Aux@feddit.uk -1 points 1 year ago (1 child) The fuck are you talking about, kiddo? Read the fucking docs! permalink fedilink source parent hideshow 1 child comment replies: [–] timhh@programming.dev 1 point 1 year ago* What docs? A bool is one byte. Get over it. Find me one normal compiler/architecture in C, C++, Go, Rust, Zig, etc. where it is not. Go on. permalink fedilink source parent
[–] timhh@programming.dev 1 point 1 year ago (4 children) You said you can't read one byte. I showed that you can. Where's the confusion? permalink fedilink source parent hideshow 4 child comments replies: [–] Aux@feddit.uk 0 points 1 year ago (3 children) Internally it will still read a whole word. Because the CPU cannot read less than a word. And if you read the ARM article you linked, it literally says so. Thus any compiler worth their salt will align all byte variables to words for faster memory access. Unless you specifically disable such behaviour. So yeah, RTFM :) permalink fedilink source parent hideshow 3 child comments replies: [–] timhh@programming.dev 0 points 1 year ago (2 children) Wrong again. It depends on the CPU. They can absolutely read a single byte and they will do if you're reading from non-idempotent memory. If you're reading from idempotent memory they won't read a byte or a word. They'll likely read a whole cache line (usually 64 bytes). And if you read the ARM article you linked, it literally says so. Where? Thus any compiler worth their salt will align all byte variables to words for faster memory access. No they won't because it isn't faster. The CPU will read the whole cache line that contains the byte. RTFM Well, I would but no manual says that because it's wrong! permalink fedilink source parent hideshow 2 child comments replies: [–] Aux@feddit.uk -1 points 1 year ago (1 child) The fuck are you talking about, kiddo? Read the fucking docs! permalink fedilink source parent hideshow 1 child comment replies: [–] timhh@programming.dev 1 point 1 year ago* What docs? A bool is one byte. Get over it. Find me one normal compiler/architecture in C, C++, Go, Rust, Zig, etc. where it is not. Go on. permalink fedilink source parent
[–] Aux@feddit.uk 0 points 1 year ago (3 children) Internally it will still read a whole word. Because the CPU cannot read less than a word. And if you read the ARM article you linked, it literally says so. Thus any compiler worth their salt will align all byte variables to words for faster memory access. Unless you specifically disable such behaviour. So yeah, RTFM :) permalink fedilink source parent hideshow 3 child comments replies: [–] timhh@programming.dev 0 points 1 year ago (2 children) Wrong again. It depends on the CPU. They can absolutely read a single byte and they will do if you're reading from non-idempotent memory. If you're reading from idempotent memory they won't read a byte or a word. They'll likely read a whole cache line (usually 64 bytes). And if you read the ARM article you linked, it literally says so. Where? Thus any compiler worth their salt will align all byte variables to words for faster memory access. No they won't because it isn't faster. The CPU will read the whole cache line that contains the byte. RTFM Well, I would but no manual says that because it's wrong! permalink fedilink source parent hideshow 2 child comments replies: [–] Aux@feddit.uk -1 points 1 year ago (1 child) The fuck are you talking about, kiddo? Read the fucking docs! permalink fedilink source parent hideshow 1 child comment replies: [–] timhh@programming.dev 1 point 1 year ago* What docs? A bool is one byte. Get over it. Find me one normal compiler/architecture in C, C++, Go, Rust, Zig, etc. where it is not. Go on. permalink fedilink source parent
[–] timhh@programming.dev 0 points 1 year ago (2 children) Wrong again. It depends on the CPU. They can absolutely read a single byte and they will do if you're reading from non-idempotent memory. If you're reading from idempotent memory they won't read a byte or a word. They'll likely read a whole cache line (usually 64 bytes). And if you read the ARM article you linked, it literally says so. Where? Thus any compiler worth their salt will align all byte variables to words for faster memory access. No they won't because it isn't faster. The CPU will read the whole cache line that contains the byte. RTFM Well, I would but no manual says that because it's wrong! permalink fedilink source parent hideshow 2 child comments replies: [–] Aux@feddit.uk -1 points 1 year ago (1 child) The fuck are you talking about, kiddo? Read the fucking docs! permalink fedilink source parent hideshow 1 child comment replies: [–] timhh@programming.dev 1 point 1 year ago* What docs? A bool is one byte. Get over it. Find me one normal compiler/architecture in C, C++, Go, Rust, Zig, etc. where it is not. Go on. permalink fedilink source parent
[–] Aux@feddit.uk -1 points 1 year ago (1 child) The fuck are you talking about, kiddo? Read the fucking docs! permalink fedilink source parent hideshow 1 child comment replies: [–] timhh@programming.dev 1 point 1 year ago* What docs? A bool is one byte. Get over it. Find me one normal compiler/architecture in C, C++, Go, Rust, Zig, etc. where it is not. Go on. permalink fedilink source parent
[–] timhh@programming.dev 1 point 1 year ago* What docs? A bool is one byte. Get over it. Find me one normal compiler/architecture in C, C++, Go, Rust, Zig, etc. where it is not. Go on. permalink fedilink source parent
