https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111821
--- Comment #6 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Richard Biener <rgue...@gcc.gnu.org>: https://gcc.gnu.org/g:8f3d0c8c3dd02d94635517c68fd314cbceed8373 commit r15-2741-g8f3d0c8c3dd02d94635517c68fd314cbceed8373 Author: Richard Biener <rguent...@suse.de> Date: Fri Aug 2 13:49:34 2024 +0200 middle-end/111821 - compile-time/memory-hog with large copy The following fixes a compile-time/memory-hog when performing a large aggregate copy to a small object allocated to a register. While store_bit_field_1 called by store_integral_bit_field will do nothign for accesses outside of the target the loop over the source in store_integral_bit_field will still code-generate the read parts for all words in the source. The following copies the noop condition from store_bit_field_1 and terminates the loop when it runs forward or avoid code-generating the read parts when not. PR middle-end/111821 * expmed.cc (store_integral_bit_field): Terminate the word-wise copy loop when we get out of the destination and do a forward copy. Skip the word if it would be outside of the destination in case of a backward copy. * gcc.dg/torture/pr111821.c: New testcase.
