Programming: Compilers and Perl
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ARMv8.5 Support Lands In GCC Compiler With Latest Spectre Protection
Landing just in time with the GCC 9 branching being imminent is ARMv8.5-A support in the GNU Compiler Collection's ARM64/AArch64 back-end.
This ARMv8.5-A support is an incremental upgrade over the existing ARMv8 support. The ARMv8.5 additions are similar to what we already saw land for LLVM / Clang.
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Comparing The Quality Of Debug Information Produced By Clang And Gcc
I've had an intuition that clang produces generally worse debuginfo than gcc for optimized C++ code. It seems that clang builds have more variables "optimized out" — i.e. when stopped inside a function where a variable is in scope, the compiler's generated debuginfo does not describe the value of the variable. This makes debuggers less effective, so I've attempted some qualitative analysis of the issue.
I chose to measure, for each parameter and local variable, the range of instruction bytes within its function over which the debuginfo can produce a value for this variable, and also the range of instruction bytes over which the debuginfo says the variable is in scope (i.e. the number of instruction bytes in the enclosing lexical block or function). I add those up over all variables, and compute the ratio of variable-defined-bytes to variable-in-scope-bytes. The higher this "definition coverage" ratio, the better.
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Quo vadis, Perl?
By losing the sight of the strategies in play, I feel the discussion degenerated very early in personal accusations that certainly leave scars while not resulting in even a hint of progress. We are not unique in this situation, see the recent example of the toll it took on Guido van Rossum. I can only sympathize with Larry is feeling these days.
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