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2adb375c50
Motivation is similar to NO_UDBL_DIVISION. The alternative implementation of 64-bit mult is straightforward and aims at obvious correctness. Also, visual examination of the generate assembly show that it's quite efficient with clang, armcc5 and arm-clang. However current GCC generates fairly inefficient code for it. I tried to rework the code in order to make GCC generate more efficient code. Unfortunately the only way to do that is to get rid of 64-bit add and handle the carry manually, but this causes other compilers to generate less efficient code with branches, which is not acceptable from a side-channel point of view. So let's keep the obvious code that works for most compilers and hope future versions of GCC learn to manage registers in a sensible way in that context. See https://bugs.launchpad.net/gcc-arm-embedded/+bug/1775263 |
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| .. | ||
| data_files | ||
| abi_check.py | ||
| apidoc_full.sh | ||
| bump_version.sh | ||
| config.pl | ||
| ecc-heap.sh | ||
| find-mem-leak.cocci | ||
| footprint.sh | ||
| generate_errors.pl | ||
| generate_features.pl | ||
| generate_visualc_files.pl | ||
| massif_max.pl | ||
| memory.sh | ||
| output_env.sh | ||
| rename.pl | ||
| rm-calloc-cast.cocci | ||
| tmp_ignore_makefiles.sh | ||