“What Has My Compiler Done for Me Lately? Unbolting the Compiler's Lid”
summary
A quick history and demo: a 2012 bash script grows into Compiler Explorer, a Node.js site that pipes user code to many compilers (GCC/Clang/MSVC via Docker on AWS) and returns assembly, diffs and a CFG beta. Concrete wins shown: range-for compiles to the same 10–14 instructions as indexed loops, compilers replace hand shifts with lea and multiply tricks, eliminate divides via magic constants, use popcnt and turn O(n) summations into O(1). Site costs ≈$150–200/month and runs cached, public compiler images, with execution and more languages planned.
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chapters (15)
- 0:00Introduction and background
- 1:05Why learn assembly?
- 4:22Compiler Explorer origin
- 7:35X86 assembly overview
- 14:51Range-based for loops
- 20:13Vector optimization analysis
- 28:29Multiplication optimization
- 32:54Division and modulus
- 37:08Hash map optimizations
- 39:39Bit counting tricks
- 42:15Closed-form solutions
- 47:31Building Compiler Explorer
- 53:12Security challenges
- 58:25Future developments
- 1:03:18Q&A and concluding remarks
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