Re: [PATCH] Fix a REE bug (PR rtl-optimization/78132)

> 2016-10-27 Jakub Jelinek > > PR rtl-optimization/78132 > * ree.c (combine_reaching_defs): Give up if copy_needed and > !HARD_REGNO_MODE_OK (REGNO (src_reg), dst_mode). > > * gcc.target/i386/pr78132.c: New test. OK, thanks. -- Eric Botcazou

[PATCH] Fix a REE bug (PR rtl-optimization/78132)

Hi! REE breaks the following testcase on KNL, where we only accept QImode/HImode in k0-k7 registers (SImode/DImode is only supported with -mavx512bw). We have (set (reg:HI k0) (mem:HI ...)) ... (set (reg:DI rax) (zero_extend:DI (reg:HI k0))) and we optimize it into: (set (reg:DI rax) (zero_extend