Marek Behún 86c5e21013 ARM: make gd a function call for LTO and set via set_gd() ... On ARM, the gd pointer is stored in registers r9 / x18. For this the -ffixed-r9 / -ffixed-x18 flag is used when compiling, but using global register variables causes errors when building with LTO, and these errors are very difficult to overcome. Richard Biener says [1]: Note that global register vars shouldn't be used with LTO and if they are restricted to just a few compilation units the recommended fix is to build those CUs without -flto. We cannot do this for U-Boot since all CUs use -ffixed-reg flag. It seems that with LTO we could in fact store the gd pointer differently and gain performance or size benefit by allowing the compiler to use r9 / x18. But this would need more work. So for now, when building with LTO, go the clang way, and instead of declaring gd a global register variable, we make it a function call via macro. [1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68384 Signed-off-by: Marek Behún <marek.behun@nic.cz> Reviewed-by: Simon Glass <sjg@chromium.org>		2021-05-24 14:21:30 -04:00
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asm	ARM: make gd a function call for LTO and set via set_gd()	2021-05-24 14:21:30 -04:00
debug	SPDX: Convert all of our single license tags to Linux Kernel style	2018-05-07 09:34:12 -04:00