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Like any other instruction with 32-bit GPR destination operand in 64-bit mode, popcntl also clears the upper 32 bits of the register (and other bits too, it can return only 0 to 32 inclusive). During combine, the zero or sign extensions of it show up as paradoxical subreg of the popcount & 63, there 63 is the smallest power of two - 1 mask that can represent all the 0 to 32 inclusive values. 2020-01-30 Jakub Jelinek <jakub@redhat.com> PR target/91824 * config/i386/i386.md (*popcountsi2_zext): New define_insn_and_split. (*popcountsi2_zext_falsedep): New define_insn. * gcc.target/i386/pr91824-1.c: New test.
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