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GNU lightning 2.2.1 release

Posted by Roy Schestowitz on Feb 17, 2023

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GNU lightning is a library to aid in making portable programs that compile assembly code at run time.

Development:http://git.savannah.gnu.org/cgit/lightning.git

=> ↺ http://git.savannah.gnu.org/cgit/lightning.git

Download release:ftp://ftp.gnu.org/gnu/lightning/lightning-2.2.1.tar.gz

=> ftp://ftp.gnu.org/gnu/lightning/lightning-2.2.1.tar.gz

� GNU Lightning 2.2.1 main new features:

Variable stack framesize implemented for aarch64, arm, i686, mips, riscv, loongarch and x86_64. This means function calls use only the minimum required stack space for prolog and epilog.Optimization of prolog and epilog to not create a frame pointer if not required, and not even save and restore the stack pointer if not required on a leaf function. These features implemented for the ports with variable stack framesize.New clor, czr, ctor and ctzr instructions, that count leading/trailing zeros/ones. These use hardware implementation when available, otherwise fallback to a software implementation.Correct several bugs with jit_arg_register_p and jit_putarg{r,i}{_f,_d}. These bugs were not noticed earlier due to an incorrect check for correctness in check/carg.c.Add rip relative addressing support for x86_64 and shorter signed 64 bit constant load if the constant fits in a signed 32 bit integer. This significantly reduces code size generation.Correct bugs in branch generation code for pppc and sparc.Correct bug in signed 32 bit integer load in ppc 64 bits.Add short relative unconditional branches and calls to mips, reducing code size generation.And several extra minor optimizations. Read on

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