[Bug target/89021] Implement mmintrin.h in SSE

[hjl at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89021

--- Comment #6 from hjl at gcc dot gnu.org <hjl at gcc dot gnu.org> ---
Author: hjl
Date: Wed May 15 15:02:54 2019
New Revision: 271213

URL: https://gcc.gnu.org/viewcvs?rev=271213&root=gcc&view=rev
Log:
i386: Allow MMX register modes in SSE registers

In 64-bit mode, SSE2 can be used to emulate MMX instructions without
3DNOW.  We can use SSE2 to support MMX register modes.

        PR target/89021
        * config/i386/i386-c.c (ix86_target_macros_internal): Define
        __MMX_WITH_SSE__ for TARGET_MMX_WITH_SSE.
        * config/i386/i386.c (ix86_set_reg_reg_cost): Add support for
        TARGET_MMX_WITH_SSE with VALID_MMX_REG_MODE.
        (ix86_vector_mode_supported_p): Likewise.
        * config/i386/i386.h (TARGET_MMX_WITH_SSE): New.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/i386/i386-c.c
    trunk/gcc/config/i386/i386.c
    trunk/gcc/config/i386/i386.h