https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67609
--- Comment #37 from Richard Henderson <rth at gcc dot gnu.org> --- Author: rth Date: Wed Nov 18 15:45:26 2015 New Revision: 230552 URL: https://gcc.gnu.org/viewcvs?rev=230552&root=gcc&view=rev Log: PR rtl-opt/67609 Backport from mainline * config/i386/i386.c (ix86_cannot_change_mode_class): Tighten sse check to the exact conditions of PR 67609. * config/i386/i386.c (ix86_cannot_change_mode_class): Disallow narrowing subregs on SSE and MMX registers. * doc/tm.texi.in (CANNOT_CHANGE_MODE_CLASS): Clarify when subregs that appear to be sub-words of multi-register pseudos must be rejected. * doc/tm.texi: Regenerate. Added: branches/gcc-5-branch/gcc/testsuite/gcc.target/i386/pr67609-2.c branches/gcc-5-branch/gcc/testsuite/gcc.target/i386/pr67609.c Modified: branches/gcc-5-branch/gcc/ChangeLog branches/gcc-5-branch/gcc/config/i386/i386.c branches/gcc-5-branch/gcc/doc/tm.texi branches/gcc-5-branch/gcc/doc/tm.texi.in
