https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106453
--- Comment #3 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Alexander Monakov <amona...@gcc.gnu.org>: https://gcc.gnu.org/g:810d9815249451f477d4cbc67b8e4a0819c37faa commit r13-2448-g810d9815249451f477d4cbc67b8e4a0819c37faa Author: Alexander Monakov <amona...@ispras.ru> Date: Tue Aug 23 18:42:24 2022 +0300 i386: avoid zero extension for crc32q The crc32q instruction takes 64-bit operands, but ignores high 32 bits of the destination operand, and zero-extends the result from 32 bits. Let's model this in the RTL pattern to avoid zero-extension when the _mm_crc32_u64 intrinsic is used with a 32-bit type. PR target/106453 gcc/ChangeLog: * config/i386/i386.md (sse4_2_crc32di): Model that only low 32 bits of operand 0 are consumed, and the result is zero-extended to 64 bits. gcc/testsuite/ChangeLog: * gcc.target/i386/pr106453.c: New test.
